游离氨调理污泥厌氧消化优化产甲烷过程与强化有机物释放  

Free ammonia conditioning promoted micro-molecule organics release and methanogenesis of thickened sludge

作　　者：沈嘉辉 王侃宏 郁达伟[1,3] 胡大洲 魏源送[1,3] SHEN Jiahui;WANG Kanhong;YU Dawei;HU Dazhou;WEI Yuansong(Laboratory of Water Pollution Control Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,Hebei,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]中国科学院生态环境研究中心,水污染控制实验室,北京100085 [2]河北工程大学能源与环境工程学院,河北邯郸056038 [3]中国科学院生态环境研究中心,环境模拟与污染控制国家重点联合实验室,北京100085

出　　处：《化工学报》2022年第9期4147-4155,共9页CIESC Journal

基　　金：国家自然科学基金面上项目(52170062);江西省科学院科技计划项目(2020-YZD-09)。

摘　　要：针对污泥减量和资源化目标,采用游离氨调理浓缩污泥,评估了有机物释放和产甲烷促进效果。结果表明,浓缩污泥经游离氨(200~800 mg·L^(-1),24 h)调理,累积产甲烷量和产甲烷潜势分别提高了34.6%、23.3%。不同于高能耗预处理的彻底溶胞破壁,游离氨调理主要强化了小分子有机物穿胞透壁的释放,较对照组提升SCOD浓度5.19%~23.81%、溶解性蛋白质浓度1.47%~14.55%、溶解性多糖浓度-0.64%~14.63%。后续厌氧消化过程中VS水解明显,溶解性SCOD的降解提升34.2%~62.24%。基于三维荧光光谱(3D-EEM)的平行因子法(PARAFAC)分析结果表明,可利用程度较高的色氨酸类物质荧光组分明显提高,表明游离氨强化了生物难降解性有机物转化和可降解性有机物的降解。在此过程中,厌氧消化第一次产气高峰(0~5 d)以及第二次产气高峰(9~12 d)的速率分别提升21.04%、120.39%。上述结果表明,游离氨调理强化了浓缩污泥中有机物的初期释放和后期转化,从而提升了甲烷产率,是一种绿色低耗的污泥资源化技术。To facilitate reduction and resource recovery from excess sludge,thickened sludge was conditioned with free ammonia conditioning(200-800 mg·L^(-1),24 h).The results demonstrate that the methanogenesis was promoted by release of micro-molecules organics through the cell membrane.The accumulated methane production and biochemical methane potential was promoted by 34.6%and 23.3%,respectively.The soluble organic matters was released as soluble chemical oxygen demand(SCOD),including soluble protein,and soluble carbohydrate which were promoted by 5.19%-23.81%,1.47%-14.55%,and-0.64%-14.63%,respectively.Hydrolysis of the released organic matters was further enhanced by 34.2%-62.24%in form of SCOD.The first methane production peak(0-5 d)and the secondary peak(9-12 d)was improved by 21.04%,120.39%,respectively.Parallel factor analysis(PARAFAC)based on 3-D fluorescence spectroscopy(3DEEM)indicated that the refractory organic matter converted to biodegradable tryptophan.The above results show that free ammonia conditioning strengthens the initial release and later conversion of organic matter in the thickened sludge,thereby improving the methane yield,which is a green and low-consumption sludge resource technology.

关 键 词：游离氨 调理 浓缩污泥 产甲烷 小分子有机物 

分 类 号：X703.1[环境科学与工程—环境工程]