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Evaluation of the shear stability of aerobic granular sludge from a pilot-scale membrane bioreactor:Establishment of a quantitative method 认领 引用
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作者 Biao Yang Bingduo Wang +7 位作者 Liying Bin Weirui Chen Xinyi Chen Ping Li Shanglong Wen Shaosong Huang Zhiqi Zhang Bing Tang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第2期579-590,共12页
This work established a quantitative method to access the shear stability of aerobic granular sludge(AGS)and validated its feasibility by using the mature AGS from a pilot-scale(50 tons/day)membrane bioreactor(MBR)for... This work established a quantitative method to access the shear stability of aerobic granular sludge(AGS)and validated its feasibility by using the mature AGS from a pilot-scale(50 tons/day)membrane bioreactor(MBR)for treating real municipal wastewater.The results showed that the changing rate( S)of the peak area(S)of granule size distribution(GSD)exhibited an exponential relationship(R2≥0.76)with the shear time(y=a−b·cx),which was a suitable indicative index to reflect the shear stability of different AGS samples.The limiting granule size(LGS)was defined and proposed to characterize the equilibrium size for AGS after being sheared for a period of time,whose value in terms of Dv50 showed high correlation(R2=0.92)with the parameter a.The free Ca2+(28.44-34.21 mg/L)in the influent specifically interacted with polysaccharides(PS)in the granule’s extracellular polymeric substance(EPS)as a nucleation site,thereby inducing the formation of Ca precipitation to enhance its Young’s modulus,while Ca2+ primarily interacted with PS in soluble metabolic product(SMP)during the initial granulation process.Furthermore,the Young’s modulus significantly affected the parameter a related to shear stability(R2=0.99).Since the parameter a was more closely related(R2=1.00)to S than that of the parameter b or c,the excellent correlation(R2=0.99)between the parameter a and the wet density further verified the feasibility of this method. 展开更多
关键词 Shear stability Quantitative evaluation Aerobic granular sludge Membrane bioreactor Pilot-scale study Municipal wastewater
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Integrated reaction–separation in a pilot-scale catalytic membrane reactor for efficient continuous p-nitrophenol hydrogenation 认领 引用
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作者 Ziming Chen Yuyan Gao +6 位作者 Zhihao Guo Yan Du Zhengyan Qu Jiuxuan Zhang Zhenchen Tang Hong Jiang Rizhi Chen 《Green Energy & Environment》 SCIE EI CAS CSCD 2025年第12期2321-2326,共6页
Hydrogenation reactions,vital in chemical engineering,are hampered by limitations including catalyst recovery,mass transfer issues,and scalability.Catalytic membrane reactors offer a promising alternative by integrati... Hydrogenation reactions,vital in chemical engineering,are hampered by limitations including catalyst recovery,mass transfer issues,and scalability.Catalytic membrane reactors offer a promising alternative by integrating reaction and separation,boosting efficiency and simplifying catalyst handling.However,scaling these membranes to industrial levels while ensuring long-term stability and high efficiency remains a significant challenge.This study tackles this by developing and demonstrating a pilot-scale multi-channel ceramic catalytic membrane reactor system.This system,featuring three 19-channel ceramic catalytic membranes,achieved nearly 100%p-nitrophenol hydrogenation conversion consistently over 600 h of continuous liquid-phase operation.This underscores the superior catalytic efficiency,remarkable long-term stability,and strong scalability of multi-channel ceramic catalytic membrane.This work establishes a robust platform for continuous-flow hydrogenation,providing a solid foundation for practical catalytic membrane reactor technology application in the chemical industry. 展开更多
关键词 Pilot-scale Catalytic membrane reactor Forced flow through Continuous hydrogenation p-nitrophenol hydrogenation
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Cultivation strategy optimization and pilot-scale production of Spirulina subsalsa grown in seawater and monosodium glutamate wastewater 认领 引用
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作者 Mingyan Liu Liqun Jiang +3 位作者 Ze Yu Meng Ma Huiying Chen Haiyan Pei 《Bioresources and Bioprocessing》 SCIE EI CSCD 2025年第1期1301-1315,共15页
Spirulina subsalsa represents a promising candidate for commercial production.Yet,due to its unique pattern of attached growth followed by upward flotation,there is an urgent need to find a suitable cultivation strate... Spirulina subsalsa represents a promising candidate for commercial production.Yet,due to its unique pattern of attached growth followed by upward flotation,there is an urgent need to find a suitable cultivation strategy and achieve scale-up.In the low-cost medium of seawater plus monosodium glutamate wastewater,this study initially investigated the influence of aeration rate(0,0.3,0.6 L/min)and reactor geometry(D24d4.5,D18d8,D12d18,D:diameter,cm;d:depth,cm)on microalgal growth,indicating that Spirulina subsalsa was suited for culturing in non-aerated,wide-shallow reactors.Then,in the single plastic reactor,diverse depths(2.25,4.50,9.00 cm)and surface areas(1000,2000,and 3000 cm2)for culturing Spirulina subsalsa were optimised to 4.5 cm and 2000 cm2.Subsequently,a pilot-scale cultivation system with a volume of 162 L was constructed,adopting a semi-continuous culture mode.The average dry mass productivity was 0.12 g/L/d and 816.48 g of algal powder was harvested within 41 days.The mean contents of protein,carbohydrate and lipid were respectively 46.50%,14.95% and 10.87%.Moreover,economic analysis demonstrated that the cost of produced algal powder was 8.30 USD/kg.In the future,Spirulina subsalsa has the potential to be developed into multiple products. 展开更多
关键词 Spirulina subsalsa Cultivation approach Pilot-scale cultivation Biomass composition
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Petrochemical wastewater treatment with a pilot-scale bioaugmented biological treatment system 认领 引用 被引量：6
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作者 ZHAO Li-jun MA Fang +1 位作者 GUO Jing-bo ZHAO Qing-liang 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第11期1831-1838,共8页
In solving the deterioration of biological treatment system treating petrochemical wastewater under low temperatures, bioaugmentation technology was adopted by delivering engineering bacteria into a pilot-scale two-st... In solving the deterioration of biological treatment system treating petrochemical wastewater under low temperatures, bioaugmentation technology was adopted by delivering engineering bacteria into a pilot-scale two-stage anoxic-oxic (A/O) process based on previous lab-scale study. Experimental results showed that when the concentrations of COD and NH4+-N of the influent were 370~910 mg/L and 10~70 mg/L, the corresponding average concentrations of those of effluent were about 80 mg/L and 8 mg/L respectively, which was better than the Level I criteria of the Integrated Wastewater Discharge Standard (GB8978-1996). According to GC-MS analysis of the effluents from both the wastewater treatment plant (WWTP) and the pilot system, there were 68 kinds of persistent organic pollutants in the WWTP effluent, while there were only 32 in that of the pilot system. In addition, the amount of the organics in the effluent of the pilot system reduced by almost 50% compared to that of the WWTP. As a whole, after bioaugmentation, the organic removal efficiency of the wastewater treatment system obviously in- creased. 展开更多
关键词 Bioaugmentation Petrochemical wastewater Pilot-scale study GC/MS
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Highly efficient CO2 capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale 认领 引用 被引量：2
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作者 Kun Li Han Tang +5 位作者 Shuangshuang Li Zixuan Huang Bei Liu Chun Deng Changyu Sun Guangjin Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第3期148-156,共9页
To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO2 capture efficiency and... To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO2 capture efficiency and decrease the energy cost further,we report a new carbon capture approach using a 2-methylimidazole(mIm)aqueous solution.The properties and sorption behaviors of this approach have been experimentally investigated.The results show that the mIm solution has higher CO2 absorption capacity under relatively higher equilibrium pressure(>130 kPa)and lower desorption heat than the methyldiethanolamine solution.91.6%sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa.The selectivity for CO2/N2 and CO2/CH4 can reach an exceptional 7609 and 4324,respectively.Furthermore,the pilot-scale tests were also performed,and the results demonstrate that more than 98%of CO2 in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L-1.This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry. 展开更多
关键词 CO2 capture Absorption 2-Methylimidazole Separation Pilot-scale tests
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Effect of C/N Ratio on DHA Production by Schizochytrium sp.JN-3 and Its Pilot-scale Fermentation 认领 引用
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作者 Xiaole XIA Hailing YANG +3 位作者 Yuji LI Ling ZHANG Yu XIN Wu WANG 《Agricultural Biotechnology》 2012年第1期51-53,57,共3页
[ Objective] This study aimed to explore the effect of C/N ratio on DHA production by Schizochytrium sp. , and the results were verified by pilot-scale fermentation. [ Method] Effect of C/N ratio on DHA production by ... [ Objective] This study aimed to explore the effect of C/N ratio on DHA production by Schizochytrium sp. , and the results were verified by pilot-scale fermentation. [ Method] Effect of C/N ratio on DHA production by Schizochytrium sp. JN-3 was explored. The industrial fermentation potential of Schizochytrium sp. JN-3 was investigated by pilot-scale fermentation in a 200 L fermentation tank. [ Result] Results of fermentation in a 7 L fermentation tank showed that the maximum biomass and total lipid content were 34.3 and 20.1 g/L, respectively, when C/N ratio was 10 ; the maximum DHA yield was 46.9% when C/N ratio was 20. When pilot-scale fermentation was conducted in a 200 L fermentation tank, the biomass was 30. 2 g/L, total lipid content was 18.4 g/L, accounting for 63.2% of the dry weight of cells; DHA content was 7.4 g/L, accounting for 40. 2% of the total lipid content. [ Condasion ] Schizochytrlum sp. JN-3 has good industrial fermentation notential. 展开更多
关键词 Schizochytrium sp. DHA C/N ratio Pilot-scale fermentation
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Combination of a crude oil-degrading bacterial consortium under the guidance of strain tolerance and a pilot-scale degradation test 认领 引用 被引量：8
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作者 Yilin Liu Chen Li +4 位作者 Lei Huang Yun He Tingting Zhao Bo Han Xiaoqiang Jia 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第12期1838-1846,共9页
Under the guidance of strain tolerance, a new combination method for crude oil-degrading bacterial consortium was studied. Firstly, more than 50 efficient crude oil-degrading and biosurfactant producing bacteria were ... Under the guidance of strain tolerance, a new combination method for crude oil-degrading bacterial consortium was studied. Firstly, more than 50 efficient crude oil-degrading and biosurfactant producing bacteria were isolated from petroleum-contaminated soil and water in Tianjin Binhai New Area Oil field, China. Twenty-four of them were selected for further study. These strains were identified as belonging Pseudornonas aeruginosa, Bacillus subtilis, Brevibacillus brevis, Achrornobacter sp., Acinetobacter venetianus, Lysinibacillus rnacroides, Klebsiella oxytoca, Stenotrophornonas rhizophila, Rhodococcus sp. and Bacillus thuringiensis. A shake-flask degradation test revealed that 12 of these strains could degrade over 50% of 1% crude oil concentration in 7 d. Of these, 8 strains were able to produce biosurfactants. Furthermore, environmental tolerance experiments indicated that the majority of the strains had the ability to adapt to extreme environments including high temperatures, alkaline en- vironments and high salinity environments. A mixed bacterial agent comprising the strains WB2, W2, W3 and HA was developed based on the environmental tolerance tests and subjected to the pilot-scale degradation test indicating that this bacterial agent could degrade 85.2% of 0.8% crude oil concentration in 60 d. Our results suggest that the application of this mixed agent could remediate crude oil polluted soils in saline and alkaline environments. 展开更多
关键词 Crude oil-degrading strains Biosurfactant producer Environmental tolerance Pilot-scale bioremediation
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Denitrification and biofilm growth in a pilot-scale biofilter packed with suspended carriers for biological nitrogen removal from secondary effluent 认领 引用 被引量：6
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作者 Yunhong Shi Guangxue Wu +1 位作者 Nan Wei Hongying Hu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第6期35-41,共7页
Tertiary denitrification is an effective method for nitrogen removal from wastewater. A pilot-scale biofilter packed with suspended carriers was operated for tertiary denitrification with ethanol as the organic carbon... Tertiary denitrification is an effective method for nitrogen removal from wastewater. A pilot-scale biofilter packed with suspended carriers was operated for tertiary denitrification with ethanol as the organic carbon source. Long-term performance, biokinetics of denitrification and biofilm growth were evaluated under filtration velocities of 6, 10 and 14 m/hr. The pilot-scale biofilter removed nitrate from the secondary effluent effectively, and the nitrate nitrogen（NO_3-N） removal percentage was 82%, 78% and 55% at the filtration velocities of 6, 10 and 14 m/hr, respectively. At the filtration velocities of 6 and 10 m/hr, the nitrate removal loading rate increased with increasing influent nitrate loading rates, while at the filtration velocity of 14 m/hr, the removal loading rate and the influent loading rate were uncorrelated.During denitrification, the ratio of consumed chemical oxygen demand to removed NO_3-N was 3.99-4.52 mg/mg. Under the filtration velocities of 6, 10 and 14 m/hr, the maximum denitrification rate was 3.12, 4.86 and 4.42 g N/（m^2·day）, the half-saturation constant was 2.61, 1.05 and 1.17 mg/L, and the half-order coefficient was 0.22, 0.32 and 0.24（mg/L）1/2/min,respectively. The biofilm biomass increased with increasing filtration velocity and was 2845,5124 and 7324 mg VSS/m^2 at filtration velocities of 6, 10 and 14 m/hr, respectively. The highest biofilm density was 44 mg/cm^3 at the filtration velocity of 14 m/hr. Due to the low influent loading rate, biofilm biomass and thickness were lowest at the filtration velocity of 6 m/hr. 展开更多
关键词 Tertiary denitrification Pilot-scale biofilter Biokinetics Suspended carriers Biofilm
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Screening and pilot-scale evaluation of a highly efficient pesticide-degrading Pseudomonas sp.strain BL5 认领 引用 被引量：1
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作者 Rui Chen Xinyu Zuo +6 位作者 He Bai Ruolin Qin Zhiguo Chen Yiyun Liu Wenqing Cao Jingpeng Song Xiaoqiang Jia 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第10期287-294,共8页
The widespread use of pesticides has caused serious harm to ecosystems,necessitating effective and environmentally friendly treatment methods.Bioremediation stands out as a promising approach for pollutant treatment,w... The widespread use of pesticides has caused serious harm to ecosystems,necessitating effective and environmentally friendly treatment methods.Bioremediation stands out as a promising approach for pollutant treatment,wherein the metabolic activities of microorganisms can transform toxic pesticides into compounds with lower or no toxicity.In this study,we obtained eight pesticide-degrading strains from pesticide-contaminated sites through continuous enrichment and screening.Four highly efficient pesticide-degrading strains(degradation ratios exceeding 80%)were identified.Among them,Pseudomonas sp.BL5 exhibited the strongest growth(exceeding 109 CFU·ml-1)and outstanding degradation of benzene derivatives and chlorinated hydrocarbons at both laboratory and pilot scales,with degradation ratios exceeding 98%and 99.6%,respectively.This research provides new tools and insights for the bioremediation of pesticide-related pollutants. 展开更多
关键词 Pesticides Pilot-scale Degradation Remediation Pseudomonas sp. Benzene
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Nitrogen and phosphorus removal in pilot-scale anaerobic-anoxic oxidation ditch system 认领 引用 被引量：36
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作者 PENG Yongzhen HOU Hongxun +2 位作者 WANG Shuying CUI Youwei Zhiguo Yuan 《Journal of Environmental Sciences》 SCIE EI CAS 2008年第4期398-403,共6页
To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was... To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was studied in a pilot-scale, anaerobicanoxic oxidation ditch （OD）, where the volumes of anaerobic zone, anoxic zone, and ditches zone of the OD system were 7, 21, and 280 L, respectively. The reactor was fed with municipal wastewater with a flow rate of 336 L/d. The concept of simultaneous nitrification and denitrification （SND） rate （rSND） was put forward to quantify SND. The results indicate that： （1） high nitrogen and phosphorus removal efficiencies were achieved during the stable SND phase, total nitrogen （TN） and total phosphate （TP） removal rates were 80% and 85%, respectively; （2） when the system was aerated excessively, the stability of SND was damaged, and rSND dropped from 80% to 20% or less; （3） the natural logarithm of the ratio of NOx to NH4^＋ in the effluent had a linear correlation to oxidation-reduction potential （ORP）; （4） when NO3^- was less than 6 mg/L, high phosphorus removal efficiency could be achieved; （5） denitrifying phosphorus removal （DNPR） could take place in the anaerobic-anoxic OD system. The major innovation was that the SND rate was devised and quantified. 展开更多
关键词 oxidation ditch biological nitrogen removal biological phosphorus removal simultaneous nitrification and denitrification （SND） pilot scale municipal wastewater
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Pilot-scale Study on Electro-catalytic Oxidation of High-salt Wastewater from Coal Chemical Industry 认领 引用
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作者 ZHAOHaixia 《外文科技期刊数据库（文摘版）自然科学》 2022年第6期059-062,共4页
Industrial wastewater from modern industrial production often contains excessive organic hazardous substances or excessive salts, acids and bases, etc. Traditional methods cannot play an effective role in the treatmen... Industrial wastewater from modern industrial production often contains excessive organic hazardous substances or excessive salts, acids and bases, etc. Traditional methods cannot play an effective role in the treatment of such wastewater. Moreover, since such wastewater is also not suitable for the growth of microorganisms, the way of wastewater treatment by microorganisms is also greatly limited. For this kind of industrial waste water, apart from the degradation of organic matters, the separation of inorganic salts and waste water is also required to meet the sewage discharge standard. Based on this, the article focuses on the coal chemical high salt wastewater electro-catalytic oxidation pilot study. 展开更多
关键词 coal chemical industry high-salt wastewater electro-catalytic oxidation pilot-scale study
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Biochar-supported nano-scale zerovalent iron activated persulfate for remediation of aromatic hydrocarbon-contaminated soil:an in-situ pilot-scale study 认领 引用 被引量：5
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作者 Yu Zeng Tai Li +7 位作者 Yingzhi Ding Guodong Fang Xiaolei Wang Bo Ye Liqiang Ge Juan Gao Yujun Wang Dongmei Zhou 《Biochar》 SCIE CAS CSCD 2022年第1期122-133,共12页
Biochar supported nano-scale zerovalent iron(nZVI/BC)for persulfate(PS)activation has been studied extensively for the degradation of pollutants on the lab scale,but it was rarely applied in practical soil remediation... Biochar supported nano-scale zerovalent iron(nZVI/BC)for persulfate(PS)activation has been studied extensively for the degradation of pollutants on the lab scale,but it was rarely applied in practical soil remediation in the field.In this research,we developed a facile ball-milling method for the mass production of nZVI/BC,which was successfully applied to activate persulfate for the remediation of organic polluted soil on an in-situ pilot scale.In-situ high-pressure injection device was developed to inject nZVI/BC suspension and PS solution into the soil with a depth of 0-70 cm.The removal efficiency of target pollutants such as 2-ethylnitrobenzene(ENB,1.47-1.56 mg/kg),biphenyl(BP,0.19-0.21 mg/kg),4-(methylsulfonyl)toluene(MST,0.32-0.43 mg/kg),and 4-phenylphenol(PP,1.70-2.46 mg/kg)at different soil depths was 99.7%,99.1%,99.9%and 99.7%,respectively,after 360 days of remediation.The application of nZVI/BC significantly increased the degradation rates of contaminants by 11-322%,ascribed to its relatively higher efficiency of free radical generation than that of control groups.In addition,it was found that nZVI/BC-PS inhibited soil urease and sucrase enzyme activities by 1-61%within 55 days due to the oxidative stress for microbes induced by free radicals,while these inhibition effects disappeared with remediation time prolonged(>127 days).Our research provides a useful implementation case of remediation with nZVI/BC-PS activation and verifies its feasibility in practical contaminated soil remediation. 展开更多
关键词 Persulfate Biochar Nanoscale zerovalent iron Pilot-scale Enzyme activities
Reaction mechanism of arsenic capture by a calcium-based sorbent during the combustion of arsenic-contaminated biomass: A pilot-scale experience 认领 引用 被引量：3
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作者 Mei Lei Ziping Dong +3 位作者 Ying Jiang Philip Longhurst Xiaoming Wan Guangdong Zhou 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2019年第2期105-113,共9页
Large quantities of contaminated biomass due to phytoremediation were disposed through combustion in low-income rural regions of China.This process provided a solution to reduce waste volume and disposal cost.Pilot-sc... Large quantities of contaminated biomass due to phytoremediation were disposed through combustion in low-income rural regions of China.This process provided a solution to reduce waste volume and disposal cost.Pilot-scale combustion trials were conducted for in site disposal at phytoremediation sites.The reaction mechanism of arsenic capture during pilot-scale combustion should be determined to control the arsenic emission in flue gas.This study investigated three Pteris vittata L.biomass with a disposal capacity of 600 kg/d and different arsenic concentrations from three sites in China.The arsenic concentration in flue gas was greater than that of the national standard in the trial with no emission control,and the arsenic concentration in biomass was 486 mg/kg.CaO addition notably reduced arsenic emission in flue gas,and absorption was efficient when CaO was mixed with biomass at 10% of the total weight.For the trial with 10% CaO addition,arsenic recovery from ash reached 76%,which is an ~8-fold increase compared with the control.Synchrotron radiation analysis confirmed that calcium arsenate is the dominant reaction product. 展开更多
关键词 Arsenic contamination Phytoremediation Emission control Calcium-based sorbent Biomass disposal Pilot-scale combustion
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Carbon source recovery from waste sludge reduces greenhouse gas emissions in a pilot-scale industrial wastewater treatment plant 认领 引用 被引量：4
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作者 Qiandi Wang Xiqi Li +7 位作者 Wenzong Liu Siyuan Zhai Qiongying Xu Chang'an Huan Shichen Nie Qinghua Ouyang Hongcheng Wang Aijie Wang 《Environmental Science and Ecotechnology》 SCIE 2023年第2期106-113,共8页
Carbon cycle regulation and greenhouse gas(GHG)emission abatement within wastewater treatment plants(WWTPs)can theoretically improve sustainability.Currently,however,large amounts of external carbon sources used for d... Carbon cycle regulation and greenhouse gas(GHG)emission abatement within wastewater treatment plants(WWTPs)can theoretically improve sustainability.Currently,however,large amounts of external carbon sources used for deep nitrogen removal and waste sludge disposal aggravate the carbon footprint of most WWTPs.In this pilot-scale study,considerable carbon was preliminarily recovered from primary sludge(PS)through short-term(five days)acidogenic fermentation and subsequently utilized on-site for denitrification in a wool processing industrialWWTP.The recovered sludge-derived carbon sources were excellent electron donors that could be used as additional carbon supplements for commercial glucose to enhance denitrification.Additionally,improvements in carbon and nitrogen flow further contributed to GHG emission abatement.Overall,a 9.1%reduction in sludge volatile solids was achieved from carbon recovery,which offset 57.4%of external carbon sources,and the indirect GHG emissions of the target industrial WWTP were reduced by 8.05%.This study demonstrates that optimizing the allocation of carbon mass flow within a WWTP has numerous benefits. 展开更多
关键词 Carbon neutralization Resource recovery Anaerobic fermentation Sludge reduction Pilot-scale study
Catalytic ozonation in advanced treatment of kitchen wastewater:multi-scale simulation and pilot-scale study 认领 引用 被引量：2
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作者 Zuoyong Zhou Ni Yan +6 位作者 Mengxi Yin Tengfei Ren Shuning Chen Kechao Lu Xiaoxin Cao Xia Huang Xiaoyuan Zhang 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2023年第12期47-58,共12页
Catalytic ozonation is regarded as a promising technology in the advanced treatment of refractory organic wastewater.Packed-bed reactors are widely used in practical applications due to simple structures,installation ... Catalytic ozonation is regarded as a promising technology in the advanced treatment of refractory organic wastewater.Packed-bed reactors are widely used in practical applications due to simple structures,installation and operation.However,mass transfer of packed-bed reactors is relatively restrained and amplified deviations usually occurred in scale-up application.Herein,a multi-scale packed-bed model of catalytic ozonation was established to guide pilot tests.First,a laboratory-scale test was conducted to obtain kinetic parameters needed for modeling.Then,a multi-scale packed-bed model was developed to research the effects of water distribution structure,catalyst particle size,and hydraulic retention time(HRT)on catalytic ozonation.It was found that the performance of packed bed reactor was increased with evenly distributed water inlet,HRT of 60 min,and catalyst diameter of about 3-7 mm.Last,an optimized reactor was manufactured and a pilot-scale test was conducted to treat kitchen wastewater using catalytic ozonation process.In the pilot-scale test with an ozone dosage of 50 mg/L and HRT of 60 min,the packed-bed reactor filled with catalysts I was able to reduce chemical oxygen demand(COD)from 117 to 59 mg/L.The performance of the catalytic ozonation process in the packed-bed reactor for the advanced treatment of actual kitchen wastewater was investigated via both multi-scale simulation and pilot-scale tests in this study,which provided a practical method for optimizing the reactors of treating refractory organic wastewater. 展开更多
关键词 Catalytic ozonation Multi-scale simulation Pilot-scale study Kitchen wastewater
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Insights into influence of aging processes on zero-valent iron modified biochar in copper(II) immobilization: from batch solution to pilot-scale investigation 认领 引用
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作者 Huabin Wang Dingxiang Chen +4 位作者 Yi Wen Ting Cui Ying Liu Yong Zhang Rui Xu 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2023年第7期880-892,共13页
The zero-valent iron modified biochar materials are widely employed for heavy metals immobilization.However,these materials would be inevitably aged by natural forces after entering into the environment,while there ar... The zero-valent iron modified biochar materials are widely employed for heavy metals immobilization.However,these materials would be inevitably aged by natural forces after entering into the environment,while there are seldom studies reported the aging effects of zero-valent iron modified biochar.In this work,the hydrogen peroxide and hydrochloric acid solution were applied to simulate aging conditions of zero-valent iron modified biochar.According to the results,the adsorption capacity of copper(II)contaminants on biochar,zero-valent iron modified biochar-1,and zero-valent iron modified biochar-2 after aging was decreased by 15.36%,22.65%and 23.26%,respectively.The surface interactions were assigned with chemisorption occurred on multi-molecular layers,which were proved by the pseudo-second-order and Langmuir models.After aging,the decreasing of capacity could be mainly attributed to the inhibition of ion-exchange and zero-valent iron oxidation.Moreover,the plant growth and soil leaching experiments also proved the effects of aging treatment,the zero-valent iron modified biochar reduced the inhibition of copper(II)bioavailability and increased the mobility of copper(II)after aging.All these results bridged the gaps between bio-adsorbents customization and their environmental behaviors during practical agro-industrial application. 展开更多
关键词 zero-valent iron modified biochar aging processes copper removal adsorption pilot-scale experiments
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Comparative investigations on pilot-scale anaerobic digestion of food waste at 30℃and 35℃ 认领 引用
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作者 Wang Long Zhu Baoning +3 位作者 Yuan Hairong Liu Yanping Zou Dexun Li Xiujin 《International Journal of Agricultural and Biological Engineering》 SCIE 2016年第1期109-117,共9页
Parallel pilot-scale anaerobic digestion systems were conducted to evaluate the influence of system temperatures(30℃and 35℃)on digestion performance,greenhouse gas control and economic efficiency.Biogas productions(... Parallel pilot-scale anaerobic digestion systems were conducted to evaluate the influence of system temperatures(30℃and 35℃)on digestion performance,greenhouse gas control and economic efficiency.Biogas productions(6.64-12.96 m3/d)and methane yields(0.46-0.61 m3/kg VS)of 35℃digestion system were significantly higher than those of 30℃digestion system with the organic loading rate(OLR)of 2.0-4.5 kg VS/m3·d.Two regression equations of methane yields with increasing OLRs were fitted at 30℃and 35℃to predict the methane production of practical food waste(FW)digestion plants.By analyzing process stability,the optimal operating OLRs of 35℃digestion system(4.0 kg VS/m3·d)was found to be higher than that of 30℃digestion system(3.0 kg VS/m3·d),indicating that the 35℃digestion system had better processing capacity.The greenhouse gas emission under corresponding optimal operating OLR of 35℃digestion system was also calculated to be better than that of 30℃digestion system.Even the system temperature of 30℃was found to be more suitable for the digestion where OLR was less than 3.0 kg VS/m3·d,a higher operational temperature of 35℃was still a better choice for conventional high-solid digestion. 展开更多
关键词 food waste anaerobic digestion pilot-scale organic loading rate greenhouse gas economic efficiency
Development and experimental study on a pilot-scale feed pellet mill 认领 引用 被引量：1
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作者 Fei Peng Fang Fang Zhigang Huang 《International Journal of Agricultural and Biological Engineering》 SCIE 2020年第6期201-206,共6页
Pilot-scale pellet mill has many advantages and great potential application prospect.In this work,a structure of pilot-scale pellet mill was designed and the effects of moisture content(12%-20%w.b.),temperature(55... Pilot-scale pellet mill has many advantages and great potential application prospect.In this work,a structure of pilot-scale pellet mill was designed and the effects of moisture content(12%-20%w.b.),temperature(55°C-95°C)and ring die speed(160-320 r/min)on the production and physical properties(pellet durability,bulk density and hardness)of the produced feed pellets were determined and analyzed.The results showed that pellet durability ranged from 90.47%to 96.92%,bulk density 537.4 kg/m3 to 62.2 kg/m3,hardness 5.26 kg to 9.65 kg and production 26.51 kg/h to 42.81 kg/h.Pellet durability was found to increase with the increase of temperature and moisture content,but to decrease with the increase of ring die speed.Bulk density showed a monotonic increase with temperature and ring die speed.Hardness increased with the increase of temperature,but exhibited a first ascending and then descending trends with the increase of moisture content.It also indicted that high ring die speed favored production.Due to its fast and cheap production in a suitable scale,the designed pilot scale pellet mill prototype and the comprehensive research would contribute to the production of feed pellets in various processing conditions with different feed formulas,like additive selection and so on,in order to meet diversified demands. 展开更多
关键词 feed pilot-scale pellet mill experimental study ring die speed
Effective cost control of Haematococcus pluvialis cultivation under pilot scale conditions:sustainable utilization of waste shells and safe nitrogen sources 认领 引用
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作者 Shuai GUO Feng LI +6 位作者 Jun WANG Lingkun JING Feng PAN Dian XIE Hongwei KE Chunhui WANG Minggang CAI 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第2期879-889,共11页
Currently,nitrates are the most commonly used nitrogen source for microalgal cultivation,but most of them are explosive chemicals,posing safety risks and their use is restricted.Therefore,microalgae producers urgently... Currently,nitrates are the most commonly used nitrogen source for microalgal cultivation,but most of them are explosive chemicals,posing safety risks and their use is restricted.Therefore,microalgae producers urgently need to find safer and more economical alternatives.This work systematically investigated the development of novel culture medium to improve safety and reduce costs during microalgal cultivation.Urea was screened out as the best nitrogen source,and the optimum nitrogen concentration was 265 mg/L.When waste shells were used as pH stabilizer and carbon supplement,the biomass and biomass productivity were increased to 1.26 g/L and 71.59 mg/(L·d),respectively.Pilot-scale cultivation was carried out in 50-L flat plate photobioreactors,and the Logistic model fitted the growth curves well.Notably,economic analysis showed the new medium could save 29.09%–32.76%of the input cost.This work provided a new alternative culture medium for the large-scale culture of Haematococcus pluvialis. 展开更多
关键词 economic evaluation growth kinetics Haematococcus pluvialis microalgal culture medium pilot-scale cultivation
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Direct recovery of low-concentration Au(S2O323-from pregnant leach solution using an activated carbon-coated titanium electrode 认领 引用
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作者 Yong Zeng Xiyuan Che +4 位作者 Lei Zhang Peng Chen Shaoxian Song Deshou Wang Feifei Jia 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1886-1899,I0008-I0012,共14页
Thiosulfate gold extraction technology has gained considerable interest owing to its environmental compatibility and broad applicability to diverse ore types.However,the lack of efficient methods to recover Au(S2O_... Thiosulfate gold extraction technology has gained considerable interest owing to its environmental compatibility and broad applicability to diverse ore types.However,the lack of efficient methods to recover Au(S2O323-from leaching solutions has hindered its industrial implementation.To address this challenge,this study used a thiosulfate leaching solution from quartz-type gold ores to design an activated carbon-coated titanium electrode(Ti@AC)with a porous surface structure.This electrode facilitated the direct reduction of lowconcentration Au(S2O323-to metallic gold(Au0)in solution,achieving a gold recovery of 99.58%,surpassing other recovery methods from the leaching solution by 30%‒80%.After ten consecutive 200 L pilot-scale tests,the Ti@AC electrode demonstrated remarkable stability,consistently maintaining a recovery>98%and yielding 20.23 g of gold.The porous architecture of the activated carbon(AC)promoted the adsorption of low-concentration Au(S2O323-,while its low charge transfer resistance facilitated the efficient conversion of Au(S2O323-to Au0.Moreover,the reduction reaction generated a concentration gradient near the cathode,promoting the diffusion of Au(S2O323-toward the electrode and ensuring an efficient recovery process.This study provides a feasible strategy for the direct reduction of low-concentration precious metal ions to monomers with high recovery and low costs,which is promising for industrial applications. 展开更多
关键词 thiosulfate gold extraction direct recovery activated carbon electrode low-concentration gold pilot-scale test
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