热碱法处理污泥沼渣及其厌氧发酵性能研究  

ALKALINE-THERMAL HYDROLYSIS OF SEWAGE SLUDGE DIGESTATE AND ITS PERFORMANCE IN ANAEROBIC FERMENTATION

作　　者：刘宝村 周集体[1] 金若菲[1] 田天 崔甜甜 LIU Baocun;ZHOU Jiti;JIN Ruofei;TIAN Tian;CUI Tiantian(Key Laboratory of Industrial Ecology and Environmental Engineering,MOE,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学工业生态与环境工程教育部重点实验室,辽宁大连116024

出　　处：《环境工程》2023年第9期166-173,共8页Environmental Engineering

基　　金：循环利用石化废弃物减碳工艺技术开发(2022YF13GX061)。

摘　　要：针对污泥沼渣中有机质难以回收利用的问题,利用热碱法破解污泥沼渣,探究了不同条件对沼渣破解率和有机物溶出率的影响,确定了热碱法处理污泥沼渣的最佳条件为:pH=13、T=80℃、t=8 h。此条件下,污泥沼渣的破解率为40.9%,COD、蛋白质、多糖的溶出率分别为722.2,79.7,73.7 mg/g VSS。利用热碱处理后的污泥沼渣破解液进行厌氧发酵产甲烷,比较了不同初始pH值对厌氧发酵的影响,发现初始pH值的改变对有机物降解率的影响较小,但初始pH值的增加会提高发酵过程中CH_(4)的产率,降低CO_(2)的产率,提高产气中CH_(4)含量。因此确定初始pH值=13时污泥沼渣破解液产甲烷效果最好,此时COD去除率为61.1%,CH4产率达到65.0 mL/g VSS,产气中CH4含量能够达到81.0%。该研究证明热碱处理可提高污泥沼渣的可生化性,具有应用于厌氧发酵产甲烷的潜力。To recover and reuse the organic matter in sewage sludge digestate,this work adopted alkaline-thermal hydrolysis to treat the digestate,exploring the effects of different conditions on its disintegration and organics dissolution efficiency.The optimal conditions for alkaline-thermal hydrolysis of sewage sludge digestate were determined as pH=13,T=80℃,and t=8 h.Under these conditions,the disintegration efficiency of sewage sludge digestate achieved 40.9%,with the dissolution efficiency of COD,protein,and polysaccharide of 722.2,79.7,and 73.7 mg/g VSS,respectively.The sewage sludge digestate after alkaline-thermal hydrolysis was used as substrates for anaerobic fermentation to produce methane.The effect of initial pH on anaerobic fermentation was further investigated.It was found that the best methane yield was achieved at the initial pH of 13,and the COD removal efficiency was 61.1% with a methane yield of 65.0 mL/g VSS and a methane proportion of 81.0% in the produced biogas.This work confirms that alkaline-thermal hydrolysis can improve the biodegradability of sewage sludge digestate,and its potential in producing methane through anaerobic fermentation.

关 键 词：污泥沼渣 热碱水解 溶出率 厌氧消化 甲烷产率 

分 类 号：X703[环境科学与工程—环境工程]