剩余污泥中温和高温厌氧水解酸化产VFAs性能研究  

Study on VFAs production performance of anaerobic hydrolytic acidification of excess sludge at mesophilic and thermophilic condition

作　　者：熊惠磊 张晓聪 杨海洋 段双妮[2] 刘海涛[2] 陈选平 张志强 施汉昌 XIONG Huilei;ZHANG Xiaocong;YANG Haiyang;DUAN Shuangni;LIU Haitao;CHEN Xuanping;ZHANG Zhiqiang;SHI Hanchang(Beijing Institute of Collaborative Innovation,Beijing 100094,China;Xiangnan University,Chenzhou 423099,China;Hunan Nature Environmental Protection Technology Co.,Ltd.,Chenzhou 423099,China;Academy of Agricultural Planning and Engineering,MARA,Beijing 100025,China;Tsinghua University,Beijing 100084,China)

机构地区：[1]北京协同创新研究院,北京100094 [2]湘南学院,湖南郴州423099 [3]湖南大自然环保科技有限公司,湖南郴州423099 [4]农业农村部规划设计研究院,北京100125 [5]清华大学,北京100084

出　　处：《工业水处理》2022年第8期78-86,共9页Industrial Water Treatment

基　　金：国家重点研发计划——政府间国际科技创新合作(2019YFE0109000);国家水污染治理重大专项资助项目(2009ZX07313-003);环境模拟与污染控制国家重点联合实验室研究基金(9Z01ESPCT)。

摘　　要：通过对比中温(35℃)和高温(50℃)厌氧产酸过程中挥发性有机酸(VFAs)含量与成分的变化,研究温度对剩余污泥的颗粒粒径、颗粒有机物降解情况、可溶性化学需氧量(SCOD)及挥发性有机酸(VFAs)的影响。结果表明,高温厌氧发酵可以显著促进污泥絮体解离,污泥分解率可达41.10%,微生物反应机率增加,反应效率提高。中温发酵和高温发酵过程中颗粒性有机物的水解过程均遵循一级反应动力学,且高温水解速率常数显著高于中温水解速率常数。中温水解液中未知溶解性有机物积累量高,转化慢,可能是中温发酵产酸效果低于高温条件的原因之一。高温发酵获得的VFAs约为中温VFAs产量的2倍,其中有机酸异戊酸和异丁酸的比例较高,二者约占VFAs的50%;中温发酵过程VFAs的组分单一,主要为乙酸。水解液中氨氮的增加量与颗粒型蛋白质的分解量存在强相关关系,高温发酵下的氨氮转化因子显著高于中温发酵的氨氮转化因子。The effects of temperature on sludge particle size,degradation of organic matter,soluble chemical oxygen demand(SCOD)and volatile organic acids(VFAs)of excess sludge were investigated by comparing content and composition of VFAs during anaerobic acidification at mesophilic(35℃)and thermophilic(50℃).The results showed that thermophilic anaerobic acidification could significantly promote sludge particle dissociation.Sludge decomposition rate could reach 41.10%.Microbial reaction probability increased and reaction efficiency improved.The hydrolysis process of particulate organic matter in both mesophilic and thermophilic acidification followed first-order reaction kinetics,and the thermophilic hydrolysis rate constant was significantly higher than that of mesophilic hydrolysis.The high accumulation and slow conversion of unknown dissolved organic matter in mesophilic hydrolysate may be one of the reasons for the lower acidification effect of mesophilic fermentation.The VFAs obtained from thermophilic fermentation were about twice the yield of mesophilic fermentation,with a high proportion of isovaleric acids and isobutyric acid,both of which accounted for about 50%of the VFAs.The composition of VFAs during mesophilic fermentation was single,mainly acetic acid.The increase of ammonia nitrogen in the hydrolysate was strongly correlated with the decomposition amount of granular proteins.The ammonia nitrogen conversion factor under thermophilic fermentation was significantly higher than that of mesophilic fermentation.

关 键 词：中温厌氧产酸 高温厌氧产酸 剩余污泥 水解酸化 

分 类 号：TU992.3[建筑科学—市政工程]