连续流动态膜餐厨垃圾和剩余污泥厌氧混合发酵系统的运行效能  

Operational efficiency of continuous anaerobic dynamic membrane codigestion system with food waste and waste activated sludge

作　　者：张凯迪 邢保山 张毅 常享琳 唐喜芳 陈荣[1,2,3,4,5] 王晓昌[1,2,3,4,5] ZHANG Kaidi;XING Baoshan;ZHANG Yi;CHANG Xianglin;TANG Xifang;CHEN Rong;WANG Xiaochang(School of Environmental&Municipal Engineering,Xi’an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Northwest Water Resource,Environment and Ecology,Ministry of Education,Xi'an 710055,China;International Science&Technology Cooperation Center for Urban Alternative Water Resources Development,Xi'an 710055,China;Engineering Technology Research Center for Wastewater Treatment and Reuse,Shaanxi Province,Xi'an 710055,China;Key Laboratory of Environmental Engineering,Shaanxi Province,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西北水资源与环境生态教育部重点实验室,西安710055 [3]国家城市非传统水资源开发利用国际科技合作基地,西安710055 [4]陕西省污水处理与资源化工程技术研究中心,西安710055 [5]陕西省环境工程重点实验室,西安710055

出　　处：《环境工程学报》2022年第11期3676-3684,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(52100162);中国博士后科学基金资助项目(2021MD703869)。

摘　　要：为探究厌氧动态膜生物反应器(DMBR)在典型城市有机废弃物厌氧发酵领域应用的可行性,以餐厨垃圾(FW)和剩余污泥(WAS)为处理对象,在连续流条件下探究动态膜FW和WAS厌氧混合发酵系统的运行效能,并优化基质混合比(FW/WAS)和食微比(F/M)。结果表明,以水力停留时间(HRT)和有机负荷(OLR)分别为62.5 d和(1.84±0.45) g·L^(-1)·d^(-1)为初始条件,在连续流下启动FW和WAS厌氧混合发酵系统,经过72 d的运行,系统pH稳定在7.6~8.0,平均甲烷产量达到(0.41±0.08) L·L^(-1)·d^(-1),无短链挥发性脂肪酸(VFA)累积且TVFA/碱度最大比值仅为0.024,表明系统启动成功且运行稳定。通过对动态膜的特性分析可知,动态膜形成快速,可在较短时间内实现低浊度(<50 NTU)出料,动态膜截留效果显著。通过FW/WAS和F/M的批次优化实验可知,厌氧混合发酵系统最优FW/WAS为4.4∶1 (基于VS),定期调整优化FW/WAS有望取得更高的系统甲烷产率;相应的系统能够耐受的最大F/M为0.944,为后续充分发挥连续流动态膜FW和WAS混合发酵系统的最大效能提供依据。本研究结果可为典型城市有机废物厌氧发酵产甲烷系统的低碳高效稳定运行提供参考。To explore the feasibility of anaerobic dynamic membrane bioreactor(DMBR) in the field of anaerobic digestion with typical urban organic wastes, the operating efficiency of the continuous anaerobic dynamic membrane co-digestion system with food waste(FW) and waste activated sludge(WAS) was investigated, and the substrate mixing ratio(FW/WAS) and the food to microorganism(F/M) ratio of the codigestion system were also optimized. The results showed that the continuous anaerobic co-digestion with FW and WAS can be start-up under hydraulic retention time(HRT) of 62.5 days and organic loading rate(OLR) of(1.84±0.45) g·L^(-1)·d^(-1). After 72 days of long-term operation, the system pH and average methane production were stable realized at 7.6-8.0 and(0.41±0.08) L·L^(-1)·d^(-1), respectively without volatile fatty acids(VFA)accumulated and maximum TVFA/Alkalinity less than 0.024, which indicated that the stable system was realized. Through analysis of the dynamic membrane characteristics, the dynamic membrane can be formed rapidly with a low permeate turbidity(<50 NTU), indicated that the dynamic membrane interception effect was remarkable to achieve good permeate. Through the batch experiments to optimize the FW/WAS and F/M ratios,the optimal FW/WAS ratio of the co-digestion system was 4.4∶1(based on VS) after long-term operation. Thus,a higher methane yield can be achieved through adjust FW/WAS ratio regularly. Moreover, the corresponding maximum F/M ratio was 0.944, which can be used to guide the subsequent operation of the continuous dynamic membrane co-digestion system with FW and WAS. This study can provide a reference for the low-carbon, highrate and stable operation of anaerobic digestion system with typical urban organic wastes.

关 键 词：餐厨垃圾 剩余污泥 厌氧混合发酵 连续流 动态膜生物反应器 

分 类 号：X5[环境科学与工程—环境工程]