餐厨垃圾与活性污泥混合厌氧发酵研究
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摘要
为实现固体废弃物的能源化利用,对餐厨垃圾与污水处理厂活性污泥进行混合厌氧发酵,通过单因素实验考察了餐厨垃圾与活性污泥的物料配比、TS质量分数、接种量及温度等因素对产气性能的影响,在此基础上利用正交实验探索多因素共同作用对混合厌氧发酵产气特性及产甲烷量的影响。结果表明,多因素对累积产甲烷量的影响顺序为接种量>TS质量分数>温度>物料配比,混合厌氧发酵的最佳条件为物料配比4∶6(质量比)、TS质量分数6%、接种量55%(质量分数)、温度40℃。三次函数可以用于模拟最佳条件下混合厌氧发酵过程中日产甲烷量与发酵时间的关系,模型拟合效果较好(P<0.001),达到极显著水平,R~2为0.832,拟合结果可靠性高。
In order to realize the energy conservation of solid waste,food garbage and active sludge from waste water treatment plant was used as raw materials for mixed anaerobic fermentation.The effect of food garbage and active sludge mixing proportion,TS mass ratio,inoculums quantity and temperature on the gases production performance was investigated through single factor experiment,based on which,orthogonal experiment was designed to study the effect of multi-factors on cumulate methane production.Conclusions were as follows:the order of various factors effect on cumulate methane production was:inoculums quantity>TS mass ratio>temperature> mixing proportion.The optimum anaerobic fermentation conditions were mixing ratio of 4∶6,TS mass ratio of 6%,inoculums quantity of 55%,and temperature of 40 ℃.Cubic function could be used for simulation the relationship between daily methane production and fermentation time during mixed anaerobic fermentation under optimum condition,the model showed perfect regression with P<0.001,the R~2 was 0.832,which meant the experimental value could be well predicted by the equation.
In order to realize the energy conservation of solid waste,food garbage and active sludge from waste water treatment plant was used as raw materials for mixed anaerobic fermentation.The effect of food garbage and active sludge mixing proportion,TS mass ratio,inoculums quantity and temperature on the gases production performance was investigated through single factor experiment,based on which,orthogonal experiment was designed to study the effect of multi-factors on cumulate methane production.Conclusions were as follows:the order of various factors effect on cumulate methane production was:inoculums quantity>TS mass ratio>temperature> mixing proportion.The optimum anaerobic fermentation conditions were mixing ratio of 4∶6,TS mass ratio of 6%,inoculums quantity of 55%,and temperature of 40 ℃.Cubic function could be used for simulation the relationship between daily methane production and fermentation time during mixed anaerobic fermentation under optimum condition,the model showed perfect regression with P<0.001,the R~2 was 0.832,which meant the experimental value could be well predicted by the equation.
引文
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[21]TANG J L,WANG X C,HU Y S,et al.Lactic acid fermentation from food waste with indigenous microbiota:effects of pH,temperature and high OLR[J].Waste Management,2016,52:278-285.
[2]YAN B H,SELVAM A,WONG J W C.Application of rumen microbes to enhance food waste hydrolysis in acidogenic leachbed reactors[J].Bioresource Technology,2014,168:64-71.
[3]BREUNIG H M,JIN L,ROBINSON A,et al.Bioenergy potential from food waste in california[J].Environmental Science&Technology,2017,51(3):1120-1128.
[4]LI R,CHEN S,LI S,et al.Biogas production from anaerobic codigestion of food waste with dairy manure in a two-phase digestion system[J].Applied Biochemistry and Biotechnology,2010,160(2):643-654.
[5]SHEN F,YUAN H R,PANG Y Z,et al.Performances of anaerobic co-digestion of fruit&vegetable waste(FVW)and food waste(FW):single-phase vs.two-phase[J].Bioresource Technology,2013,144:80-85.
[6]胡新军,张敏,余俊锋,等.中国餐厨垃圾处理的现状、问题和对策[J].生态学报,2012,32(14):4575-4584.
[7]ZHANG C S,SU H J,BAEYENS J,et al.Reviewing the anaerobic digestion of food waste for biogas production[J].Renewable&Sustainable Energy Reviews,2014,38:383-392.
[8]邓媛方,丘凌,孙全平,等.蘑菇废弃菌棒及其与猪粪混合发酵对沼气产量及质量的影响[J].农业环境科学学报,2012,31(3):613-619.
[9]CHEN H,LIU Y,NI J B,et al.Full-scale evaluation of aerobic/extended-idle regime inducing biological phosphorus removal and its integration with intermittent sand filter to treat domestic sewage discharged from highway rest area[J].Biochemical Engineering Journal,2016,113:114-122.
[10]郭志伟.城市污水厂污泥与餐厨垃圾两级厌氧工艺的优化研究[D].苏州:苏州科技学院,2014.
[11]国家环境保护总局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[12]笱成柳.城市剩余活性污泥与餐厨垃圾混合厌氧发酵消化特性研究[D].长沙:湖南大学,2014.
[13]BRYAN M P.Microbial methane production-theoretical aspects[J].Journal of Animal Science,1979,48(1):193-201.
[14]MIRON Y,ZEEMAN G,VAN LIER J B,et al.The role of sludge retention time in the hydrolysis and acidification of lipids,carbohydrates and proteins during digestion of primary sludge in CSTR systems[J].Water Research,2000,34(5):1705-1713.
[15]PARK C,NOVAK J T.Characterization of activated sludge exocellular polymers using several cation-associated extraction methods[J].Water Research,2007,41(8):1679-1688.
[16]高礼安,邓功成,赵洪,等.C/N对沼气产量的影响[J].安徽农业科学,2009,37(15):6879-6908.
[17]HEO N H,PARK S C,KANG H.Effects of mixture ratio and hydraulic retention time on single-stage anaerobic co-digestion of food waste and waste activated sludge[J].Journal of Environmental Science and Health,2004,39(7):1739-1756.
[18]陈欣,涂德浴,隋倩雯,等.固体浓度对猪粪厌氧消化甲烷产出特性的影响[J].中国农业气象,2014,35(2):149-155.
[19]李靖,李学尧.接种比例对餐厨垃圾高固体浓度厌氧发酵的影响[J].环境科学与管理,2012,37(11):131-135.
[20]马磊,王德汉,谢锡龙,等.接种量对餐厨垃圾高温厌氧消化的影响[J].农业工程学报,2008,24(12):178-182.
[21]TANG J L,WANG X C,HU Y S,et al.Lactic acid fermentation from food waste with indigenous microbiota:effects of pH,temperature and high OLR[J].Waste Management,2016,52:278-285.