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Investigates of substrate mingling ratio and organic loading rate of KOH pretreated corn stover and pig manure in batch and semi-continuous system:Anaerobic digestion performance and microbial characteristics

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Chinese Journal of Chemical Engineering 2023年第10期62卷 114-123页

作者： Chenyang Zhu Ruoran Qu Xiujin Li Xiaoyu Zuo Hairong Yuan State Key Laboratory of Chemical Resource Engineering Department of Environmental Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Sinochem Commerce Co. LtdBeijing 100045China

The effects of substrate mingling ratio(SMR)(1:1,1:2,1:3,3:1,and 2:1)and organic loading rate(OLR)(50-90 g total solids per liter per day)on anaerobic co-digestion performance and microbial characteristics were investigated for pig manure(PM)and pretreated/untreated corn stover in batch and semicontinuous anaerobic digestion(AD)system.The results showed that SMR and pretreatment affected co-digestion performance.The maximum cumulative methane yield of 428.5 ml·g^(-1)(based on volatile solids(VS))was obtained for PCP13,which was 35.7%and 40.0%higher than that of CSU and PM.In the first 5 days,the maximum methane yield improvement rate was 378.1%for PCP13.The daily methane yield per gram VS of PCP13 was 11.4%-18.5%higher than that of PC_(U)13.Clostridium_sensu_stricto_1,DMER64,and Bacteroides and Methanosaeta,Methanobacterium,and Methanospirillum had higher relative abundance at the genus level.Therefore,SMR and OLR are important factor affecting the AD process,and OLR can affect methane production through volatile fatty acids.

关键词： Substrate mingling ratio organic loading rate Co-digestion Corn stover Pig manure Microbial community

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Performance evaluation of up-flow anaerobic sludge blanket(UASB) reactor for treatment of paper mill wastewater

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Journal of Environmental Sciences 2004年第2期16卷 194-198页

作者： M. Mahadevaswamy B.M. Sadashiva Murthy A.R. Girijamma Department of Environmental Engineering S.J.College of EngineeringDepartment of Environmental EngineeringS.J.College of EngineeringDepartment of Environmental EngineeringS.J.College of Engineering Mysore-570 006Karnataka StateIndiaMysore-570 006Karnataka StateIndiaMysore-570 006Karnataka StateIndia

The present study deals with the performance evaluation of the UASB reactor under varied organic loading rate(OLR) for the treatment of paper mill wastewater. The sludge granulation process started after 120 days from the start-up period. Sludge granules size was found to be 0 8 mm at OLR of 1 72 kgCOD/(m 3·d), which reached maximum size of about 1 0 to 1 2 mm at OLR of 2 1 kgCOD/(m 3·d). At the end of initial OLR of 1 0 kgCOD/(m 3·d) the VSS concentration was 12 86 gVSS/L, which got increased to 38 05 gVSS/L at the end of an OLR 2 1 kgCOD/(m 3·d). Most of the times VFA recorded were well within the limit of VFA reported in anaerobic fermentation process. Many times the pH observed was between 6 5 and 7 8, which is more favorable for any anaerobic process. It is also found that pH within the reactor increases along with the height of reactor. The total maximum biogas production was found to be 0 40 L/gCOD removals at OLR of 2 1 kgCOD/(m 3·d) and the maximum BOD removal at this stage was observed to be 90%.

关键词： UASB biogas anaerobic digestion sludge loading rate organic loading rate

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Anaerobic tapered fluidized bed reactor for starch wastewater treatment and modeling using multilayer perceptron neural network

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Journal of Environmental Sciences 2007年第12期19卷 1416-1423页

作者： RANGASAMY Parthiban PVR Iyer GANESAN Sekaran Department of Chemical Engineering Sri Venkateswara College of Engineering Sriperumbudur 602 105TamilnaduIndia. Department of Environmental Technology Central Leather Research Institute Chennai 600 025TamilnaduIndia

treatability of synthetic sago wastewater was investigated in a laboratory anaerobic tapered fluidized bed reactor （ATFBR） with a mesoporous granular activated carbon （GAC） as a support material. The experimental protocol was defined to examine the effect of the maximum organic loading rate （OLR）, hydraulic retention time （HRT）, the efficiency of the reactor and to report on its steady- state performance. The reactor was subjected to a steady-state operation over a range of OLR up to 85.44 kg COD/（m^3·d）. The COD removal efficiency was found to be 92% in the reactor while the biogas produced in the digester reached 25.38 m^3/（m^3·d） of the reactor. With the increase of OLR from 83.7 kg COD/（m^3·d）, the COD removal efficiency decreased. Also an artificial neural network （ANN） model using multilayer perceptron （MLP） has been developed for a system of two input variable and five output dependent variables. For the training of the input-output data, the experimental values obtained have been used. The output parameters predicted have been found to be much closer to the corresponding experimental ones and the model was validated for 30% of the untrained data. The mean square error （MSE） was found to be only 0.0146.

关键词： anaerobic digestion tapered fluidized bed reactor organic loading rate biogas mesoporous granular activated carbon,modeling artificial neural network

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Microbial community dynamics at high organic loading rates revealed by pyrosequencing during sugar refinery wastewater treatment in a UASB reactor

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 33-44页

作者： Liguo Zhang Qiaoying Ban Jianzheng Li College of Environmental and Resource Sciences Shanxi Universily Taiyuan 030000 China State Key Laboratory of Urban Watel Resource and Environment School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150000 China＊

The performance and rnicrobial community structure in an upflow anaerobic sludge blanket reactor （UASB） treating sugar refinery wastewater were investigated. The chemical oxygen demand （COD） removal reached above 92.0% at organic loading rates （OLRs） of 12.0-54.0 kgCOD/（m^3· d）. The volatile lhtty acids （VFAs） in effluent were increased to 451.1 mg/L from 147.9 mg/L and the specific methane production rate improved by 1.2 2.2-1bid as the OLR increased. The evolution of microbial comnmnities in anaerobic sludge at three different OLRs was investigated using pyrosequencing. Operational taxonomic units （OTUs） at a 3% distance were 353,337 and 233 for OLRI2, OLR36 and OLR54, respectively. When the OLR was increased to 54.0 kgCOD/（m^3· d） from 12.0 kgCOD/ （m^3· d） by stepwise, the microbial community structure were changed significantly. Five genera （Bacteroides, Trichococcus, Cho,seobacterium, Longilinea and Aerococcus） were the dominant fermentative bacteria at the OLR 12-0 kgCOD/（m^3· d）. However, the sample of OLR36 was dominated by Lacmcoccus, Trichococcus, Anaer-arcus and Veillonella. At the last stage （OLR = 54.0 kgCOD/ （m^3· d）, the diversity and percentage of femlentative bacteria were markedly increased. Apart from fermentative bacteria, an obvious shift was observed in hydrogen-producing acetogens and non- acetotrophic methanogens as OLR increased. Svntrophohacter, Geobacter and Methanomethylovor- ans were the dominant hydrogen-producing acetogens and methylotrophic methanogens in the samples of OLRI2 and OLR36. When the OLR was increased to 54.0 kgCOD/（m^3· d）, the mare hydrogen-producing acetogens and hydrogenotrophic methanogens were substituted with Destd/bvi- brio and Methanospillum. However, the composition of acetotrophic methanogens （Methanosaeta） was relatively stable during the whole operation period of the UASB reactor.

关键词： Upflow anaerobic sludge blanket Sugar refinery wastewater organic loading rate Pyrosequencing Microbial community structure

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Anaerobic treatment of fresh leachate from a municipal solid waste incinerator by upflow blanket filter reactor

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Frontiers of Environmental Science & Engineering 2009年第4期3卷 404-411页

作者： Pinjing HE Min LI Suyun XU Liming SHAO State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water EnvironmentCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China

This paper describes the feasibility of fresh leachate treatment by an upflow blanket filter(UBF).Through dilution and partial effluent recycling,the organic loading rates increased from 0.51 to 14.56 kg COD/(m^(3)·d),meanwhile the corresponding hydraulic retention time decreased from 9.0 to 3.6 d.The reactor was able to achieve steady-state within 80 d.Based on the distribution of COD fluxes in the process,it was concluded that anabolism was the main pathway of COD removal in the initial phase(1–33 d),accounting for 57%–85%of total COD removed.As the anaerobic consortium of bacteria reached steady-state(after 70–86 d),the majority of COD removed was transformed into methane,because the specific methane yield was close to the theoretical value(0.36 L CH4/(g CODdeg)).

关键词： distribution of COD fluxes effluent recycling leachate methane yield organic loading rate upflow blanket filter

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Comparative investigations on pilot-scale anaerobic digestion of food waste at 30℃and 35℃

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International Journal of Agricultural and Biological Engineering 2016年第1期9卷 109-117页

作者： Wang Long Zhu Baoning Yuan Hairong Liu Yanping Zou Dexun Li Xiujin Centre for Resource and Environmental Research Beijing University of Chemical TechnologyBeijing 100029China

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.

关键词： food waste anaerobic digestion pilot-scale organic loading rate greenhouse gas economic efficiency

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Performance of a Sequential Anaerobic Baffled Reactor （ABR）/Membrane Bioreactor （MBR） System Treating Caffeine Wastewater

Performance of a Sequential Anaerobic Baffled Reactor （ABR...

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2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Yuanyuan Liu Lanying Zhang Mingying Qiu Yonglei An Shanshan Li Hejun Ren Chunxin Lv Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin University

Treatment of caffeine wastewater with high COD,high nitrogen content and poor biodegradability was investigated with a sequential anaerobic baffled reactor （ABR）/membrane bioreactor （MBR） system.The effect of organic loading rate （OLR） and temperature on the performance of the system was examined.The experimental results show that the COD removal efficiency decreases with the increasing OLR for ABR,the ammonia nitrogen levels raise greatly after the ABR process and decrease to desired levels after the MBR process.Fed at an OLR of 2.23 kgCOD/m3d,the system works efficiently with an HRT of 27.5 h at 37,and the COD removal of 71.3% and 92.7% are achieved for ABR and MBR,respectively,and the removal of ammonia nitrogen is 91.7% in MBR with the effluent level of 11.49 mg/L.The optimum temperature for the ABR is 37,close to the mesophilic temperature,however,the MBR performs well in a wider temperature range of 19-37.The nitrogen compounds are converted to ammonia nitrogen in ABR and to nitrite and nitrate in MBR,thus accomplishing the removal.Therefore,the sequential ABR/MBR system may be regarded as a promising alternative for the treatment of caffeine wastewater.

关键词： caffeine wastewater anaerobic baffled reactor membrane bioreactor organic loading rate temperature

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