摘要
针对165℃、30min预处理后的混合污泥,进行高温厌氧消化的连续试验.研究了在不同的水力停留时间（HRT）下的产气量、有机物的分解率等指标,探讨了“热处理＋高温消化”实用化的可行性.结果表明,总固体（TS）为70g·L^-1、预热处理后的混合污泥经高温厌氧消化,在HRT.为10、20、30d的条件下,产气率为2.82、1.70和1.19 L·L^-1·d^-1;降解单位COD的产气量为968、1053和1091 L·kg^-1;COD分解率为47%～52%;有机物分解率与HRT的关系符合一级反应动力学关系.COD物质平衡计算结果表明,基质中50%的固态有机物被分解转化,生物气中的甲烷含量可达59.1%.本研究中的厌氧消化反应可归纳为C8.38H19.7O7.59N＋3.86H2O→4.38CH4＋2.99CO2＋NH4^＋ ＋HCO3ˉ.
Thermophilic anaerobic digestion of thermally pretreated municipal wastewater treatment plant （WWTP） sludge was investigated using completely stirred tank reactors （CSTRs） at 55℃. The concentrated sewage sludge was thermally pretreated at 165℃ for 30 minutes. This study investigated the effect of the hydraulic retention time （HRT） on the performance and stability of the thermophilie anaerobic process, such as biogas production rate, removal efficiency of organic matter, and COD mass balance. At HRTs of 10, 20 and 30 days, the biogas production rates were 2.82 , 1.70 and 1.19 L· L^-1. d^-1 and the biogas yields were 968,1053 and 1091 L·kg^-1, respectively. The removal efficiency of COD ranged from 47% to 52%. First-order reaction kinetics were suitable to describe the degradation rate of the organic matter in terms of TS, VS, COD, protein and carbohydrates. The result of a COD mass balance showed that over 50% of the influent organic matter was transformed to biogas with a methane content of 59.1%. The main reaction of the thermophilic anaerobic digestion in this study can be described by the following stoichiometric equation： C 8.38 H19.7 O7.59 N ＋ 3.86H2O→4.38CH4 ＋ 2.99CO2 ＋ NH4^＋ ＋ HCO3ˉ.
出处
《环境科学学报》
CAS
CSCD
北大核心
2007年第7期1174-1180,共7页
Acta Scientiae Circumstantiae
基金
JBIC贷款项目的资助.
关键词
厌氧消化
预热处理
混合污泥
高温
HRT
anaerobic digestion
thermal pretreatment
sewage sludge
thermophilic
HRT
