Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-diges...Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-digestion of organic waste (kitchen waste) and sewage sludge as a waste management option using microbial fuel cell (MFC) in anaerobic process. A total of five samples with different sludge-waste ratio were used with zinc (Zn) and cupper (Cu) as cell electrodes for the test. The trends of voltage generation were different for each sample in cells such as 350 mV, 263 mV, 416 mV maximum voltage were measured from sample I, II and III respectively. It was observed that the MFC with sewage sludge showed the higher values (around 960 mV) of voltages with time whereas 918 mV obtained with organic waste. Precisely comparing cases with varying the organic waste and sewage sludge ratio helps to find the best bioelectricity generation option. Using MFCs can be appeared as the solution of electricity scarcity along the world as an efficient and eco-friendly manner as well as organic solid waste and sewage sludge management.展开更多
Energy is the pillar of human economic development. Several energy sources, renewable and non-renewable, have been exploited to assure and sustain the need for sustainable development. However, depletion of non-renewa...Energy is the pillar of human economic development. Several energy sources, renewable and non-renewable, have been exploited to assure and sustain the need for sustainable development. However, depletion of non-renewable energy sources forced researchers to search for alternative cost effective and environmental friendly energy sources. Thus, conversion of waste materials into energy has obtained considerable attention. In line with this, the aim of this study is to investigate the improvement of bio-energy production through anaerobic digestion of mixture of wastes from sewage sludge and abattoir sources. The abattoir waste is functioned as a co-substrate. Laboratory scale batch anaerobic co-digestion of the waste is carried out under mesophilic condition for 20 days. Sewage Sludge (SS) alone, and different mix ratios of SS to Abattoir Waste (AW) were analyzed for bioenergy production. Besides, the nutrient values and reduction in volume of the sewage after digestion were determined. The results show that methane productions of 33.8%, 48.3% and 56.9% were obtained for SS alone and for SS:AW mix ratios of 4:1 and 3:2, respectively. The nutrient values of the slurry increased as mix ratio decreased due to the increase in the amount of AW. The obtained results indicate that bio-energy production can be improved through co-digestion of SS using AW as a co-substrate;thus warranting further investigation for the practical application in the energy production.展开更多
This paper presents bench scale experiments related to anaerobic co-digestion of aerobic sewage sludge from a pilot WWTP （waste water treatment plants）, raw glycerol from a biodiesel industry and food waste. Assays ...This paper presents bench scale experiments related to anaerobic co-digestion of aerobic sewage sludge from a pilot WWTP （waste water treatment plants）, raw glycerol from a biodiesel industry and food waste. Assays were conducted in 100 mL non-stirring penicillin vessels, at 30 ℃ and planned according to three optimization phases： （1） binary mixture of sewage sludge and FW （food waste）; （2） binary mixture of sewage sludge and glycerol; and （3） ternary mixture of sewage sludge, FW, and glycerol. In the first and second phases, the highest SMP （specific methane production） was achieved by 10% （v/v） FW and 0.5% （v/v） glycerol mixtures. The optimization of the ternary mixture during the third phase was reached by the combination of 10% （v/v） FW and 0.4% （v/v） glycerol. Despite the low SMP value, the addition of glycerol and FW contributed to doubling the SMP value of the sludge sample control.展开更多
A lab-scale continuously-stirred tank reactor （CSTR）, used for anaerobic co-digestion of fruit and vegetable waste （FVW） and food waste （FW） at different mixture ratios, was operated for 178 days at the organic ...A lab-scale continuously-stirred tank reactor （CSTR）, used for anaerobic co-digestion of fruit and vegetable waste （FVW） and food waste （FW） at different mixture ratios, was operated for 178 days at the organic loading rate of 3 kg VS （volatile solids）/（m3.day）. The dynamics of the Archaeal community and the correlations between environmental variables and methanogenic community structure were analyzed by polymerase chain reactions - denaturing gradient gel electrophoresis （PCR-DGGE） and redundancy analysis （RDA）, respectively. PCR-DGGE results demonstrated that the mixture ratio of FVW to FW altered the community composition of Archaea. As the FVW]FW ratio increased, Methanoculleus, Methanosaeta and Methanosarcina became the predominant methanogens in the community. Redundancy analysis results indicated that the shift of the methanogenic community was significantly correlated with the composition of acidogenic products and methane production yield. Different mixture ratios of substrates led to different compositions of intermediate metabolites, which may affect the methanogenic community. These results suggested that the analysis of microbial communities could be used to diagnose anaerobic processes.展开更多
基于序批式中温(35℃)厌氧消化小试试验,对添加了不同比例脱水污泥(以VS计)的有机生活垃圾协同厌氧消化系统的降解性能与产气性能进行了对比分析。结果显示,当有机生活垃圾与脱水污泥VS比为0.6:0.4时为最优条件,协同厌氧消化系统可获得...基于序批式中温(35℃)厌氧消化小试试验,对添加了不同比例脱水污泥(以VS计)的有机生活垃圾协同厌氧消化系统的降解性能与产气性能进行了对比分析。结果显示,当有机生活垃圾与脱水污泥VS比为0.6:0.4时为最优条件,协同厌氧消化系统可获得最短厌氧消化周期(10 d),甲烷产量达到306.3 mL CH_4g^(-1)VS_(add),VS降解率达到68.9%,此时沼气相中H_2S含量可降低为16μL/L,无须脱硫处理即可资源化利用。因此,添加适量脱水污泥的有机生活垃圾协同厌氧消化系统有效地缩短和消除酸化停滞期,获得较优的甲烷产量和VS降解率,并使沼气中的H_2S大幅降低。为改善我国农村地区有机生活垃圾的高效厌氧生物制气处理提供重要参考。展开更多
文摘Recently microbial fuel cells (MFCs) have been considered as an alternative power generation technique by utilizing organic wastes. In this study, an experiment was carried out to generate bioelectricity from co-digestion of organic waste (kitchen waste) and sewage sludge as a waste management option using microbial fuel cell (MFC) in anaerobic process. A total of five samples with different sludge-waste ratio were used with zinc (Zn) and cupper (Cu) as cell electrodes for the test. The trends of voltage generation were different for each sample in cells such as 350 mV, 263 mV, 416 mV maximum voltage were measured from sample I, II and III respectively. It was observed that the MFC with sewage sludge showed the higher values (around 960 mV) of voltages with time whereas 918 mV obtained with organic waste. Precisely comparing cases with varying the organic waste and sewage sludge ratio helps to find the best bioelectricity generation option. Using MFCs can be appeared as the solution of electricity scarcity along the world as an efficient and eco-friendly manner as well as organic solid waste and sewage sludge management.
文摘Energy is the pillar of human economic development. Several energy sources, renewable and non-renewable, have been exploited to assure and sustain the need for sustainable development. However, depletion of non-renewable energy sources forced researchers to search for alternative cost effective and environmental friendly energy sources. Thus, conversion of waste materials into energy has obtained considerable attention. In line with this, the aim of this study is to investigate the improvement of bio-energy production through anaerobic digestion of mixture of wastes from sewage sludge and abattoir sources. The abattoir waste is functioned as a co-substrate. Laboratory scale batch anaerobic co-digestion of the waste is carried out under mesophilic condition for 20 days. Sewage Sludge (SS) alone, and different mix ratios of SS to Abattoir Waste (AW) were analyzed for bioenergy production. Besides, the nutrient values and reduction in volume of the sewage after digestion were determined. The results show that methane productions of 33.8%, 48.3% and 56.9% were obtained for SS alone and for SS:AW mix ratios of 4:1 and 3:2, respectively. The nutrient values of the slurry increased as mix ratio decreased due to the increase in the amount of AW. The obtained results indicate that bio-energy production can be improved through co-digestion of SS using AW as a co-substrate;thus warranting further investigation for the practical application in the energy production.
文摘This paper presents bench scale experiments related to anaerobic co-digestion of aerobic sewage sludge from a pilot WWTP （waste water treatment plants）, raw glycerol from a biodiesel industry and food waste. Assays were conducted in 100 mL non-stirring penicillin vessels, at 30 ℃ and planned according to three optimization phases： （1） binary mixture of sewage sludge and FW （food waste）; （2） binary mixture of sewage sludge and glycerol; and （3） ternary mixture of sewage sludge, FW, and glycerol. In the first and second phases, the highest SMP （specific methane production） was achieved by 10% （v/v） FW and 0.5% （v/v） glycerol mixtures. The optimization of the ternary mixture during the third phase was reached by the combination of 10% （v/v） FW and 0.4% （v/v） glycerol. Despite the low SMP value, the addition of glycerol and FW contributed to doubling the SMP value of the sludge sample control.
基金supported by the Ministry of Science and Technology of China(No.2008BADC4B16,2008BADC4B18,2008AA062401)
文摘A lab-scale continuously-stirred tank reactor （CSTR）, used for anaerobic co-digestion of fruit and vegetable waste （FVW） and food waste （FW） at different mixture ratios, was operated for 178 days at the organic loading rate of 3 kg VS （volatile solids）/（m3.day）. The dynamics of the Archaeal community and the correlations between environmental variables and methanogenic community structure were analyzed by polymerase chain reactions - denaturing gradient gel electrophoresis （PCR-DGGE） and redundancy analysis （RDA）, respectively. PCR-DGGE results demonstrated that the mixture ratio of FVW to FW altered the community composition of Archaea. As the FVW]FW ratio increased, Methanoculleus, Methanosaeta and Methanosarcina became the predominant methanogens in the community. Redundancy analysis results indicated that the shift of the methanogenic community was significantly correlated with the composition of acidogenic products and methane production yield. Different mixture ratios of substrates led to different compositions of intermediate metabolites, which may affect the methanogenic community. These results suggested that the analysis of microbial communities could be used to diagnose anaerobic processes.
文摘基于序批式中温(35℃)厌氧消化小试试验,对添加了不同比例脱水污泥(以VS计)的有机生活垃圾协同厌氧消化系统的降解性能与产气性能进行了对比分析。结果显示,当有机生活垃圾与脱水污泥VS比为0.6:0.4时为最优条件,协同厌氧消化系统可获得最短厌氧消化周期(10 d),甲烷产量达到306.3 mL CH_4g^(-1)VS_(add),VS降解率达到68.9%,此时沼气相中H_2S含量可降低为16μL/L,无须脱硫处理即可资源化利用。因此,添加适量脱水污泥的有机生活垃圾协同厌氧消化系统有效地缩短和消除酸化停滞期,获得较优的甲烷产量和VS降解率,并使沼气中的H_2S大幅降低。为改善我国农村地区有机生活垃圾的高效厌氧生物制气处理提供重要参考。
