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Combined zero valent iron and hydrogen peroxide conditioning significantly enhances the dewaterability of anaerobic digestate 被引量:2
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作者 Qilin Wang Jing Sun +6 位作者 Kang Song Xu Zhou Wei Wei Dongbo Wang Guo-Jun Xie Yanyan Gong Beibei Zhou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第5期378-386,共9页
The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to ... The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to enhance dewaterability of anaerobic digestate(AD) harvested from a wastewater treatment plant. The combination of zero valent iron(ZVI, 0–4.0 g/g total solids(TS)) and hydrogen peroxide(HP, 0–90 mg/g TS) under pH 3.0 significantly enhanced the AD dewaterability. The largest enhancement of AD dewaterability was achieved at 18 mg HP/g TS and 2.0 g ZVI/g TS, with the capillary suction time reduced by up to 90%. Economic analysis suggested that the proposed HP and ZVI treatment has more economic benefits in comparison with the classical Fenton reaction process. The destruction of extracellular polymeric substances and cells as well as the decrease of particle size were supposed to contribute to the enhanced AD dewaterability by HP + ZVI conditioning. 展开更多
关键词 anaerobic digestate DEWATERABILITY SLUDGE Zero valent iron Hydrogen peroxide
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Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer 被引量:5
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作者 Ruolin Guan Hairong Yuan +2 位作者 Liang Zhang Xiaoyu Zuo Xiujin Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第8期223-232,共10页
To improve anaerobic digestion(AD)efficiency of rice straw,solid alkaline CaO and the liquid fraction of digestate(LFD)were used as pretreatment agents of rice straw.The results showed that AD performance of rice stra... To improve anaerobic digestion(AD)efficiency of rice straw,solid alkaline CaO and the liquid fraction of digestate(LFD)were used as pretreatment agents of rice straw.The results showed that AD performance of rice straw with CaOLFD pretreatment was optimal in different pretreatment methods of the CaO+LFD,CaOLFD,LFD+CaO,CaO,and LFD.The maximum methane yield(314 ml(g VS)^(-1))and the highest VFAs concentration(14851 mg·L^(-1) on day 3)of the CaOLFD pretreatment group were 81%and 118%higher than that of the control group,respectively.Under the action of solid alkaline CaO,the bacteria of Clostridium,Atopostipes,Sphaerochaeta,Tissierella,Thiopseudomonas,Rikenellaceae,and Sedimentibacter could build up co-cultures with the archaeal of Methanosaeta,Methanobacterium,and Methanosarcina performing direct interspecies electron transfer(DIET)and improving AD performance of rice straw.Therefore,the combined pretreatment using CaO and LFD could not only pretreat rice straw but also stimulate co-cultures of microorganism to establish DIET enhancing AD efficiency. 展开更多
关键词 CaO-LFD pretreatment Direct interspecies electron transfer(DIET) Rice straw anaerobic digestion(AD) Methane
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Biocrude oil production from Chlorella sp.cultivated in anaerobic digestate after UF membrane treatment 被引量:1
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作者 Wang Meng Wang Xinfeng +8 位作者 Zhu Zhangbing Lu Jianwen Yuanhui Zhang Li Baoming Lu Haifeng Duan Na Zhang Dongming Dong Taili Liu Zhidan 《International Journal of Agricultural and Biological Engineering》 SCIE EI CAS 2017年第1期148-153,共6页
Algae cultivation in animal wastewater could recover nutrient resources,and harvest considerable amount of algae biomass for biofuel conversion.In this study,Chlorella sp.cultivated in ultrafiltration(UF)membrane trea... Algae cultivation in animal wastewater could recover nutrient resources,and harvest considerable amount of algae biomass for biofuel conversion.In this study,Chlorella sp.cultivated in ultrafiltration(UF)membrane treated anaerobic digestion effluent of chicken manure was converted into biocrude oil through hydrothermal liquefaction(HTL).The potential of biocrude production from grown Chlorella sp.was studied through changing the operational conditions of HTL,i.e.,holding temperature(HT,250℃-330℃),retention time(RT,0.5-1.5 h),and total solid(TS)(15 wt%-25 wt%)of the feedstock.The highest biocrude oil yield was 32.9%at 330℃,1.5 h and 20 wt%TS.The single factor experiments of HT also suggested that the biocrude oil yield decreased when the temperature was higher than 330℃.There were no significant differences of elemental contents in biocrude samples.The maximum higher heating values(HHV)of Chlorella sp.biocrude was 40.04 MJ/kg at HT of 330℃,RT of 1 h and TS of 15 wt%.This study suggests the great potential for energy recovery from Chlorella sp.cultivated in UF membrane treated anaerobic digestion effluent via HTL. 展开更多
关键词 MICROALGAE wastewater hydrothermal liquefaction anaerobic digestion effluent
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Effects of Potassium Ferrate and Low-Temperature Thermal Hydrolysis Co-Pretreatment on the Hydrolysis and Anaerobic Digestion Process of Waste Activated Sludge
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作者 MA Yingpeng HAO Di +3 位作者 YAO Shuo ZHANG Dahai LI Xianguo FENG Lijuan 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第6期1583-1591,共9页
This study evaluated the effect of potassium ferrate(PF)and low-temperature thermal hydrolysis co-pretreatment on the promotion of sludge hydrolysis process and the impact on acid production in the subsequent anaerobi... This study evaluated the effect of potassium ferrate(PF)and low-temperature thermal hydrolysis co-pretreatment on the promotion of sludge hydrolysis process and the impact on acid production in the subsequent anaerobic digestion process.The analytical investigations showed that co-pretreatment significantly facilitated the hydrolysis process of the sludge and contributed to the accumulation of short-chain fatty acids(SCFAs).The pretreatment conditions under the optimal leaching of organic matter from sludge were hydrothermal temperature of 75℃,hydrothermal treatment time of 12 h,and PF dosage of 0.25 g g^(−1)TSS(total suspended solids),according to the results of orthogonal experiments.By pretreatment under proper conditions,the removal rate of soluble chemical oxygen demand(SCOD)achieved 71.8%at the end of fermentation and the removal rate of total phosphorus(TP)was 69.1%.The maximum yield of SCFAs was 750.3 mg L^(−1),7.45 times greater than that of the blank group.Based on the analysis of the anaerobic digestion mechanism,it was indicated that the co-pretreatment could destroy the floc structure on the sludge surface and improve organic matter dissolving,resulting in more soluble organic substances for the acidification process.Furthermore,microbial community research revealed that the main cause of enhanced SCFAs generation was an increase in acidogenic bacteria and a reduction of methanogenic bacteria. 展开更多
关键词 waste activated sludge potassium ferrate low-temperature thermal hydrolysis anaerobic digestion short-chain fatty acids
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Effects of Biowaste-Derived Hydrochar on Anaerobic Digestion:Insights into Hydrochar Characteristics
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作者 Hongqiong Zhang Xu Wang +3 位作者 Zhaojing Qian Buchun Si Kai Jin Tengfei Wang 《Journal of Renewable Materials》 EI 2023年第10期3647-3657,共11页
Hydrochar prepared with four typical biowastes,pine wood,food waste,digested sewage sludge,and Chlorella were applied for the promotion of anaerobic digestion.The gas production and substrate composition were analyzed... Hydrochar prepared with four typical biowastes,pine wood,food waste,digested sewage sludge,and Chlorella were applied for the promotion of anaerobic digestion.The gas production and substrate composition were analyzed associated with the hydrochar characteristics.The results suggested that Chlorella hydrochar(C-C)showed the highest cumulative yield of methane(approximately 345 mL)with high total organic carbon(TOC)removal efficiency and low volatile fatty acids(VAFs)concentration.Especially,food waste hydrochar(F-C)showed a poor effect on anaerobic digestion and aroused 1.4–1.6 g/L accumulation of VAFs,in which the toxic components may account for the low efficiency.The C-C and sludge hydrochar(S-C)may develop direct interspecific electron transport(DIET)to facilitate the generation of methane by both surface groups and conductivity of the body structure,unlike pinewood hydrochar(P-C),which mainly depended on the aromatic matrix structure of hydrochar body.This work suggested that C-C can be the best candidate for the facilitation of anaerobic digestion,and N-containing biowaste like algae and lignocellulose like pine wood may establish different DIET pathways based on the physicochemical characteristics of hydrochar. 展开更多
关键词 BIOWASTE hydrochar DIET anaerobic digestion METHANE
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Effect of Sludge from Different Sources on Solid Anaerobic Digestion of Corn Straw 被引量:2
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作者 李向菲 潘薇 +2 位作者 崔凤杰 周宇光 陈华友 《Agricultural Science & Technology》 CAS 2012年第3期605-607,共3页
[Objective] The aim was to study on effect of sludge from different sources on biogas yield efficiency through anaerobic digestion of corn straw. [Method] The present research studied on daily biogas yield and the acc... [Objective] The aim was to study on effect of sludge from different sources on biogas yield efficiency through anaerobic digestion of corn straw. [Method] The present research studied on daily biogas yield and the accumulated biogas amount through anaerobic digestion of corn straw and sludges from four sources. [Result] The accumulated biogas yields produced from sludges in four sources from high to low were granular sludge, river sediments, concentrated sludge and filtered sludge. The first one proved the highest at 3.73 and 56.29 L/kg VS in daily biogas yield and the accumulated biogas. [Conclusion] The research laid foundation for full utilization of straw, improvement of energy utilization and sustainable development. 展开更多
关键词 SLUDGE Corn straw Solid anaerobic digestion
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Stable Control of Influence Factor during Two-phase Anaerobic Digestion for Agricultural Organic Waste
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作者 尹芳 张无敌 +1 位作者 柳静 杨红 《Agricultural Science & Technology》 CAS 2014年第8期1422-1423,1427,共3页
Two-phase anaerobic digestion process is influenced by acid control for hydrogen production, reaction temperature, substrate detention time, sludge activity, and granular formation. Al of these technological parameter... Two-phase anaerobic digestion process is influenced by acid control for hydrogen production, reaction temperature, substrate detention time, sludge activity, and granular formation. Al of these technological parameters are directly related to success or failure of the system operation and treatment effect. 展开更多
关键词 Agricultural organic waste Two-phase anaerobic digestion Stable con-trol
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Characteristics of high-sulfate wastewater treatment by two-phase anaerobic digestion process with Jet-loop anaerobic fluidized bed 被引量:24
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作者 WEI Chao-hai, WANG Wen-xiang, DENG Zhi-yi, WU Chao-fei School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640, China. 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第3期264-270,共7页
A new anaerobic reactor, Jet-loop anaerobic fluidized bed (JLAFB), was designed for treating high-sulfate wastewater. The treatment characteristics, including the effect of influent COD/SO42 ratio and alkalinity and... A new anaerobic reactor, Jet-loop anaerobic fluidized bed (JLAFB), was designed for treating high-sulfate wastewater. The treatment characteristics, including the effect of influent COD/SO42 ratio and alkalinity and sulfide inhibition in reactors, were discussed for a JLAFB and a general anaerobic fiuidized bed (AFB) reactor used as sulfate-reducing phase and methane-producing phase, respectively, in two-phase anaerobic digestion process. The formation of granules in the two reactors was also examined. The results indicated that COD and sulfate removal had different demand of influent COD/SO4^2- ratios. When total COD removal was up to 85%, the ratio was only required up to 1.2, whereas, total sulfate removal up to 95% required it exceeding 3.0. The alkalinity in the two reactors increased linearly with the growth of influent alkalinity. Moreover, the change of influent alkalinity had no significant effect on pH and volatile fatty acids (VFA) in the two reactors. Influent alkalinity kept at 400-500 mg/L could meet the requirement of the treating process. The JLAFB reactor had great advantage in avoiding sulfide and free-H2S accumulation and toxicity inhibition on microorganisms. When sulfate loading rate was up to 8. 1 kg/(m^3.d), the sulfide and free-H2S concentrations in JLAFB reactor were 58.6 and 49.7 mg/L, respectively. Furthermore, the granules, with offwhite color, ellipse shape and diameters of 1.0-3.0 mm, could be developed in JLAFB reactor. In granules, different groups of bacteria were distributed in different layers, and some inorganic metal compounds such as Fe, Ca, Mg etc. were found. 展开更多
关键词 Jet-loop anaerobic fluidized bed reactor sulfate wastewater two-phase anaerobic digestion process granule sludge
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Effects of ultrasonic pretreatment on sludge dewaterability and extracellular polymeric substances distribution in mesophilic anaerobic digestion 被引量:29
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作者 Liming Shao Guanzhao Wang +2 位作者 Huacheng Xu Guanghui Yu Pinjing He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2010年第3期474-480,共7页
Effect of ultrasonic pretreatment on sludge dewaterability was determined and the fate of extracellular polymeric substances (EPS) matrix in mesophilic anaerobic digestion after ultrasonic pretreatment was studied. ... Effect of ultrasonic pretreatment on sludge dewaterability was determined and the fate of extracellular polymeric substances (EPS) matrix in mesophilic anaerobic digestion after ultrasonic pretreatment was studied. Characteristics of proteins (PN), polysaccharides (PS), excitation-emission matrix (EEM) fluorescence spectroscopy and molecular weight (MW) distribution of dissolved organic matters (DOM) in different EPS fractions were evaluated. The results showed that after ultrasonic pretreatment, the normalized capillary suction time (CST) decreased from 44.4 to 11.1 (sec·L)/g total suspended solids (TSS) during anaerobic digestion, indicating that sludge dewaterability was greatly improved. The normalized CST was significantly correlated with PN concentration (R2 = 0.92, p 〈 0.01) and the PN/PS ratio (R2 = 0.84, p 〈 0.01) in the loosely bound EPS (LB-EPS) fraction. Meanwhile, the average MW of DOM in the LB- EPS and tightly bound EPS (TB-EPS) fractions also had a good correlation with the normalized CST (R2 〉 0.66, p 〈 0.01). According to EEM fluorescence spectroscopy, tryptophan-like substances intensities in the slime, LB-EPS and TB-EPS fractions were correlated with the normalized CST. The organic matters in the EPS matrix played an important role in influencing sludge dewaterability. 展开更多
关键词 anaerobic digestion excitation-emission matrix extracellular polymeric substances sludge dewaterability
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Start-up performances of dry anaerobic mesophilic and thermophilic digestions of organic solid wastes 被引量:19
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作者 LU Shu-guang IMAI Tsuyoshi +1 位作者 UKITA Masao SEKINE Masahiko 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第4期416-420,共5页
Two dry anaerobic digestions of organic solid wastes were conducted for 6 weeks in a lab-scale batch experiment for investigating the start-up performances under mesophilic and thermophilic conditions. The enzymatic a... Two dry anaerobic digestions of organic solid wastes were conducted for 6 weeks in a lab-scale batch experiment for investigating the start-up performances under mesophilic and thermophilic conditions. The enzymatic activities, i.e., β-glucosidase, N-α-benzoyl-Largininamide (BAA)-hydrolysing protease, urease and phosphatase activities were analysed. The BAA-hydrolysing protease activity during the first 2-3 weeks was low with low pH, but was enhanced later with the pH increase. β-Glucosidase activity showed the lowest values in weeks 1-2, and recovered with the increase of BAA-hydrolysing protease activity. Acetic acid dominated most of the total VFAs in thermophilic digestion, while propionate and butyrate dominated in mesophilic digestion. Thermophilic digestion was confirmed more feasible for achieving better performance against misbalance, especially during the start-up period in a dry anaerobic digestion process. 展开更多
关键词 anaerobic digestion enzymatic activity MESOPHILIC solid wastes THERMOPHILIC
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Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion 被引量:12
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作者 Muhammad Jaffar Yunzhi Pang +5 位作者 Hairong Yuan Dexun Zou Yanping Liu Baoning Zhu Rashid Mustafa Korai Xiujin Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第3期404-409,共6页
Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide (KOH) to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations o... Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide (KOH) to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations of 1% (KI), 3% ([(2), 6% (K3) and 9% (l(4) were tested for wheat straw pretreatment at ambient temperature with a C:N ratio of 25:1.86% of total solids (TS), 89% of volatile solids (VS) and 22% of lignocellulose, cellulose and hemi- cellulose (LCH) (22%) were decomposed effectively with the wheat straw pretreated by 6% KOH. Enhanced bio- gas production and cumulative biomethane yield of 258 ml. (g VS)-1 were obtained increased by 45% and 41% respectively, compared with untreated wheat straw. Pretreated wheat straw digestion also yielded a digestate with higher fertilizer values potassium (l 38%), calcium (22%) and magnesium (16%). These results show that TS, VS and LCH can be effectively removed from wheat straw pretreated with KOH, improving biodegradability biomethane production and fertilizer value. 展开更多
关键词 BIOMETHANE Fertilizer value Wheat straw anaerobic digestion KOH pretreatment
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Startup and operation of anaerobic EGSB reactor treating palm oil mill effluent 被引量:18
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作者 ZHANG Yejian YAN Li +3 位作者 CHI Lina LONG Xiuhua MEI Zhijian ZHANG Zhenjia 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第6期658-663,共6页
A bench-scale expanded granular sludge bed (EGSB) reactor was applied to the treatment of palm oil mill effluent (POME). The reactor had been operated continuously at 35℃ for 514 d, with organic loading rate (OL... A bench-scale expanded granular sludge bed (EGSB) reactor was applied to the treatment of palm oil mill effluent (POME). The reactor had been operated continuously at 35℃ for 514 d, with organic loading rate (OLR) increased from 1.45 to 17.5 kg COD/(m^3·d). The results showed that the EGSB reactor had good performance in terms of COD removal on the one hand, high COD removal of 91% was obtained at two days' of hydraulic retention time (HRT), and the highest OLR of 17.5 kg COD/(m^3·d). On the other hand, only 46% COD in raw POME was transformed into biogas in which the methane content was about 70% (V/V). A 30-d intermittent experiment indicated that the maximum transformation potential of organic matter in raw POME into methane was 56%. Volatile fatty acid (VFA) accumulation was observed in the later operation stage, and this was settled by supplementing trace metal elements. On the whole, the system exhibited good stability in terms of acidity and alkalinity. Finally, the operational problems inherent in the laboratory scale experiment and the corresponding countermeasures were also discussed. 展开更多
关键词 palm oil mill effluent MESOPHILIC anaerobic digestion expanded granular sludge bed (EGSB)
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Influence of lactic acid on the two-phase anaerobic digestion of kitchen wastes 被引量:12
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作者 ZHANG Bo CAI Wei-min HE Pin-jing 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第2期244-249,共6页
To evaluate the influence of lactic acid on the methanogenesis, anaerobic digestion of kitchen wastes was firstly conducted in a two-phase anaerobic digestion process, and performance of two digesters fed with lactic ... To evaluate the influence of lactic acid on the methanogenesis, anaerobic digestion of kitchen wastes was firstly conducted in a two-phase anaerobic digestion process, and performance of two digesters fed with lactic acid and glucose was subsequently compared. The results showed that the lactic acid was the main fermentation products of hydrolysis-acidification stage in the two-phase anaerobic digestion process for kitchen wastes. The lactic acid concentration constituted approximately 50% of the chemical oxygen demand (COD) concentration in the hydrolysis-acidification liquid. The maximum organic loading rate was lower in the digester fed with lactic acid than that fed with glucose. Volatile fatty acids (VFAs) and COD removal were deteriorated in the methanogenic reactor fed with lactic acid compared to that fed with glucose. The specific methanogenic activity (SMA) declined to 0.343 g COD/(gVSS-d) when the COD loading were designated as 18.8 g/(L-d) in the digester fed with lactic acid. The propionic acid accumulation occurred due to the high concentration of lactic acid fed. It could be concluded that avoiding the presence of the lactic acid is necessary in the hydrolysis-acidification process for the improvement of the two-phase anaerobic digestion process of kitchen wastes. 展开更多
关键词 lactic acid kitchen wastes anaerobic digestion METHANOGENESIS
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Anaerobic tapered fluidized bed reactor for starch wastewater treatment and modeling using multilayer perceptron neural network 被引量:8
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作者 RANGASAMY Parthiban PVR Iyer GANESAN Sekaran 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第12期1416-1423,共8页
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 ... 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. 展开更多
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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Performance evaluation of up-flow anaerobic sludge blanket(UASB) reactor for treatment of paper mill wastewater 被引量:7
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作者 M. Mahadevaswamy B.M. Sadashiva Murthy A.R. Girijamma 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第2期194-198,共5页
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 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%. 展开更多
关键词 UASB BIOGAS anaerobic digestion sludge loading rate organic loading rate
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Influence of temperature on performance of anaerobic digestion of municipal solid waste 被引量:6
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作者 ZHANG Ji-shi SUN Ke-wei +1 位作者 WU Man-chang ZHANG Lei 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第4期810-815,共6页
The influence of temperature on the performance of anaerobic reactors for treating the organic fraction of municipal sohd waste (OFMSW) was studied. Batch digestion of OFMSW was carded out for 32 d at different temp... The influence of temperature on the performance of anaerobic reactors for treating the organic fraction of municipal sohd waste (OFMSW) was studied. Batch digestion of OFMSW was carded out for 32 d at different temperature (25℃, 35℃, 45℃ and 55℃) conditions for total solid concentrations (TS) 17% with the ratio of total organic carbon to nitrogen (C/N) being, 25:1 respectively, while keeping other parameters constant such as inoculum, start-up pH, reactor volume (2 L) and so on. Temperature can influence the methanogenic bacteria activity, accordingly inhibiting the OFMSW biodegradation and stabilization efficiency. Anaerobic reactors excelled at TS reduction, total volatile solid reduction, chemical oxygen demand reduction, increasing cumulative biogas production, whose rate was at temperature (35℃ and 55℃) conditions. Methane concentration in the biogas was above 65% in four reactors. In addition, the fluctuation of temperatures resulted in the biogas production variation. The data obtained indicated that temperature had a significant influence on anaerobic process. 展开更多
关键词 municipal solid waste anaerobic digestion batch processing TEMPERATURE
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Effects of Oxytetracycline on Methane Production and the Microbial Communities During Anaerobic Digestion of Cow Manure 被引量:5
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作者 KE Xin WANG Chun-yong +1 位作者 LI Run-dong ZHANG Yun 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2014年第6期1373-1381,共9页
The effects of different concentrations of oxytetracycline (OTC) on the dynamics of bacterial and archaeal communities during the mesophilic anaerobic digestion (37&#176;C) of cow manure were investigated. Before... The effects of different concentrations of oxytetracycline (OTC) on the dynamics of bacterial and archaeal communities during the mesophilic anaerobic digestion (37&#176;C) of cow manure were investigated. Before anaerobic digestion, OTC was added to digesters at concentrations of 20, 50, and 80 mg L-1, respectively. Compared with no-antibiotic control, all methane productions underwent different levels of inhibition at different concentrations of OTC. Changes in the bacterial and archaeal communities were discussed by using PCR-denaturing gradient gel electrophoresis (DGGE). Results showed that OTC affected the richness and diversity of bacterial and archaeal communities. The bacterial genus Flavobacterium and an uncultured bacterium (JN256083.1) were detected throughout the entire process of anaerobic digestion and seemed to be the functional bacteria. Methanobrevibacter boviskoreani and an uncultured archaeon (FJ230982.1) dominated the archaeal communities during anaerobic digestion. These microorganisms may have high resistance to OTC and may play vital roles in methane production. 展开更多
关键词 OXYTETRACYCLINE anaerobic digestion stages (BDS DMS and FDS) PCR-DGGE bacterial community archaeal community
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Removal of HeS during Anaerobic Bioconversion of Dairy Manure 被引量:5
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作者 Jam Saifullah Lar 李秀金 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第2期273-277,共5页
The main aim of this research was the experimental study at lab scale to check the absorption technology for the in situ removal of H2S from biogas during anaerobic digestion process. The reagent FeCl3 was used to che... The main aim of this research was the experimental study at lab scale to check the absorption technology for the in situ removal of H2S from biogas during anaerobic digestion process. The reagent FeCl3 was used to check the removal efficiency of H2S produced from dairy manure during anaerobic bioconversion process. The experiments were conducted under mesophilic conditions. The composition of biogas was analyzed by gas chromatography analyzer equipped with flame photometer and thermal conductivity detectors. Experimental results under the same conditions demonstrate that high concentration of H2S in the form of FeS can be removed totally from the biogas using FeCl3 dosing with in anaerobic batch digester. 展开更多
关键词 anaerobic digestion BIOGAS dairy manure FECL3 hydrogen sulfide
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Enhancing Biogas Production from Anaerobically Digested Wheat Straw Through Ammonia Pretreatment 被引量:4
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作者 杨懂艳 庞云芝 +4 位作者 袁海荣 陈树林 马晶伟 郁亮 李秀金 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第5期576-582,共7页
Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia(2%, 4%, and 6%, dry matter) and three moisture contents(... Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia(2%, 4%, and 6%, dry matter) and three moisture contents(30%, 60%, and 80%, dry matter) were applied to pretreat wheat straw for 7 days. The pretreated wheat straws were anaerobically digested at three loading rates(50, 65, and 80 g·L-1) to produce biogas. The results indicated that the wheat straw pretreated with 80% moisture content and 4% ammonia achieved the highest methane yield of 199.7 ml·g-1(based on per unit volatile solids loaded), with shorter digestion time(T80) of 25 days at the loading rate of 65 g·L-1compared to untreated one. The main chemical compositions of wheat straw were also analyzed. The cellulose and hemicellulose contents were decomposed by 2%-20% and 26%-42%, respectively,while the lignin content was hardly removed, cold-water and hot-water extracts were increased by 4%-44%, and12%-52%, respectively, for the ammonia-pretreated wheat straws at different moisture contents. The appropriate C/N ratio and decomposition of original chemical compositions into relatively readily biodegradable substances will improve the biodegradability and biogas yield. 展开更多
关键词 wheat straw anaerobic digestion BIOGAS ammonia pretreatment moisture content
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High-solid Anaerobic Co-digestion of Food Waste and Rice Straw for Biogas Production 被引量:6
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作者 Pei Zhan-jiang Liu Jie +3 位作者 Shi Feng-mei Wang Su Gao Ya-bing Zhang Da-lei 《Journal of Northeast Agricultural University(English Edition)》 CAS 2014年第4期61-66,共6页
Anaerobic co-digestion of food waste(FW) and rice straw(RS) in continuously stirred tank reactor(CSTR) at high organic loading rate(OLR) was investigated. Co-digestion studies of FW and RS with six different m... Anaerobic co-digestion of food waste(FW) and rice straw(RS) in continuously stirred tank reactor(CSTR) at high organic loading rate(OLR) was investigated. Co-digestion studies of FW and RS with six different mixing ratios were conducted at an initial volatile solid(VS) concentration of more than 3 g VS · L-1. The biogas production, methane contents, degradation efficiency of VS, chemical oxygen demand(COD) and volatile fatty acids(VFAs) were determined to evaluate the stability and performance of the system. The results showed that the co-digestion process had higher system stability and higher volumetric biogas production than mono-digestions. Increase in FW content in the feedstock could increase the methane yield and shorten retention time. The efficiency of co-digestion systems mainly relied on the mixing ratios of FW and RS to some extent. The highest methane yield was 60.55 m L· g V· S-1 · d-1 at a mass ratio(FW/RS) of 3 : 1, which was 178% and 70% higher than that of mono-digestions of FW and RS, respectively. Consequently, the anaerobic co-digestion of FW and RS could have superior stability and better performance than monodigestions in higher organic loading system. 展开更多
关键词 food waste high-solid anaerobic digestion
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