市政污泥与玉米秸秆混合高温厌氧发酵产甲烷研究  

STUDY ON METHANE PRODUCTION BY THERMOPHILIC ANAEROBIC DIGESTION OF MUNICIPAL SLUDGE AND CORN STRAW

作　　者：李秋实 郭祥[3] 刘彬 林法伟 赵迎新[3] LI Qiushi;GUO Xiang;LIU Bin;LIN Fawei;ZHAO Yingxin(Tianjin Port Engineering Institute Co.,Ltd,Tianjin Key Laboratory of Underwater Tunnel Construction and Operation&Maintenance Technology,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd,Tianjin 300461,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China;Qingdao Institute for Ocean Engineering of Tianjin University,Qingdao 266235,China)

机构地区：[1]中交天津港湾工程研究院有限公司天津市水下隧道建设与运维技术企业重点实验室,天津300222 [2]中交第一航务工程局有限公司,天津300461 [3]天津大学环境科学与工程学院,天津300072 [4]天津大学青岛海洋技术研究院,山东青岛266235

出　　处：《环境工程》2022年第7期139-145,共7页Environmental Engineering

基　　金：港口岩土工程技术交通运输行业重点实验室开放课题基金(2021GKF-0175)。

摘　　要：以实验室自主驯化的二沉池污水为接种物,对我国天津、昭通、太原3个城市的市政污泥和玉米秸秆混合物进行了高温(55℃)厌氧发酵,考察了不同发酵体系下发酵液pH、单日产气量、累积产气量、甲烷产率等指标随发酵时间的变化情况。结果表明:污泥单独发酵几乎不存在酸化现象,稳定后的发酵液pH值高于混合发酵试验组;污泥单独发酵系统的最大单日产气量出现在第1,2天,发酵系统加入玉米秸秆后最大单日产气量出现的时间有所延迟;天津污泥单独发酵(20 g-TS)的累积产气量达到2004 mL,高于其他2组;所有发酵系统的VS去除率均达到40%以上;随着发酵过程稳定,甲烷含量维持在70~85 vol.%,天津污泥单独发酵的甲烷产率达到141.01 mL/g-VS;Modified Gompertz拟合表明污泥单独发酵不符合“S”曲线,该系统下发酵停滞期较短,污泥与玉米秸秆质量比为3∶1或2∶1时甲烷产率、产甲烷速率和发酵停滞期具有一定优势。Municipal sludge and corn straw mixtures from three cities,Tianjin,Zhaotong,Taiyuan in China were subjected to thermophilic anaerobic digestion(55℃)with domesticated secondary sedimentation tank sewage as the inoculum.The changes in pH,single-day and cumulative biogas production,and methane production under different systems with digestion time were investigated.The results indicated that anaerobic digestion of sludge-only exhibited no acidification,and its pH value was higher than that of the trials fed with corn straw.The maximum single-day biogas production of the sludge anaerobic digestion system appeared on the first or second day.With the addition of corn straw,the maximum single-day biogas production was delayed.The cumulative biogas production of the Tianjin sludge-only group reached 2004 mL,which was higher than the other two groups.The removal rates of VS under all fermentation systems were higher than 40%.As the digestion process stabilized,the methane content in biogas was maintained at 70%~85%(volume ratio).The specific methane production of Tianjin sludge-only reached 141.01 mL/g-VS.Gompertz model revealed that the sludge-only groups did not fit with the“S”curve,and the lag phase was very short.When the sludge:corn straw was 3∶1 or 2∶1,both the specific methane production,methane production rate,and lag phase had certain advantages.

关 键 词：市政污泥 玉米秸秆 高温厌氧发酵 沼气 

分 类 号：TQ920.6[轻工技术与工程—发酵工程] TQ221.11[环境科学与工程—环境工程] X703X71