剩余污泥中温和高温厌氧消化长期运行性能研究  

ong-term Operation Performance of Excess Sludge Anaerobic Digestion unde Mesophilic and Thermophilic Conditions

作　　者：高丽娟[1] 王苗 王怡[2] 彭俊 柴宝华 韩晓峰 寇晓梅[1] 庄鹏宇 GAO Li-juan;WANG Miao;WANG Yi;PENG Jun;CHAI Bao-hua;HAN Xiao-feng;KOU Xiao-mei;ZHUANG Peng-yu(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《中国给水排水》2023年第19期27-32,共6页China Water & Wastewater

基　　金：国家自然科学基金资助面上项目(52170172);陕西省重点产业创新链(群)项目(2021ZDLSF05-04);陕西省教育厅重点科学研究计划项目(20JT042)。

摘　　要：针对目前存在的污泥高温厌氧消化(TAD)能耗高的问题,设计了不同有机负荷(OLR)下污泥中温和高温厌氧消化连续试验,分析了温度及OLR对污泥厌氧消化(AD)的影响,并对系统产能和耗能进行了初步核算。连续130 d的小试结果表明,当OLR(以VS计)为2.87 g/(L·d)时,TAD系统的单位容积产甲烷速率可达到419.5 mL/(L·d),是中温厌氧消化(MAD)系统的2.9倍,是OLR为1.79 g/(L·d)时的1.6倍。同时,不同OLR下TAD系统的溶解性COD(SCOD)、总氨氮(TAN)及游离氨(FAN)浓度均高于MAD系统,但挥发性脂肪酸(VFAs)浓度与MAD系统的相差不大。此外,TAD系统中Methanosarcina为优势古菌属(占56.4%),而在MAD系统中Methanothrix占主导(占56.9%)。能量衡算表明,TAD系统可以实现能量自给,而MAD系统需要额外的能量输入。总体来看,TAD系统比MAD系统的水解产气性能更好,而且可满足能量自给,在城市污水处理厂剩余污泥能源化应用中具有更明显的优势。This study designed two continuous mesophilic and thermophilic excess sludge anaerobic digestion systems under different organic loading rates(OLR),analyzed the effects of temperature and OLR on sludge anaerobic digestion(AD),and preliminarily calculated the energy production and consumption of the systems,so as to solve the high energy consumption problem of sludge thermophilic anaerobic digestion(TAD).According to the bench-scale experiment operated continuously for 130 days,the methane yield per unit volume of TAD reached 419.5 mL/(L·d)when the OLR was 2.87g/(L·d)(measured as VS),which was 2.9 times that of the mesophilic anaerobic digestion(MAD)system,and 1.6 times that of the TAD system when the OLR was 1.79 g/(L·d).Besides,the soluble chemical oxygen demand(SCOD),total ammonia nitrogen(TAN)and free ammonia(FAN)in the TAD system under different OLRs were higher than those in the MAD system,whereas the concentrations of volatile fatty acids(VFAs)were not much different from those in the MAD system.In addition,Methanosarcina was the dominant archaea in the TAD system(56.4%),while Methanothrix was the dominant archaea in the MAD system(56.9%).The energy balance calculation showed that the TAD system could achieve energy selfsufficiency,while the MAD system required additional energy input.In general,the TAD system had better performance of hydrolysis and gas production than those of the MAD system,and could realize the energy self-sufficiency.Therefore,TAD has more obvious advantages in the energy production of excess sludge in municipal wastewater treatment plants.

关 键 词：高温厌氧消化 长期运行 微生物群落 能量衡算 

分 类 号：TU992[建筑科学—市政工程]