高温厌氧膜生物反应器处理餐厨废水的启动  

Start-up operation of anaerobic membrane bioreactor treating food wastewater under thermophilic condition

作　　者：姜萌萌[1] 林敏 郑晓宇 乔玮[1] 侯振 董仁杰[1] JIANG Meng-meng;LIN Min;ZHENG Xiao-yu;QIAO Wei;HOU Zhen;DONG Ren-jie(College of Engineering,China Agricultural University,R&D Center for Efficient Production and Comprehensive Utilization of Bio-based Gaseous Fuels,Energy Authority,National Development and Reform Committee(BGFeuls),Beijing 100083,China;Everbright Envirotech(China)Ltd.Nanjing 210007,China)

机构地区：[1]中国农业大学工学院,国家能源生物燃气高效制备及综合利用技术研发(实验)中心,北京100083 [2]光大环境科技(中国)有限公司,南京210007

出　　处：《中国环境科学》2020年第12期5318-5324,共7页China Environmental Science

基　　金：国家自然科学基金(51778616);中国农业大学国际化培养提升项目(00119521)。

摘　　要：以除油后的实际餐厨废水为原料,在高温(50±1)℃条件下利用浸没式纤维膜生物反应器(AnMBR)进行连续厌氧消化试验,以水力停留时间(HRT)20d启动,HRT 15d运行,直到发生膜污染,试验共进行了50d.研究了反应器启动和运行期间的发酵特性和膜过滤性能.研究表明,反应器30d完成了启动,在HRT 15d条件下,甲烷产量达到578L/kgVSin,COD和挥发性固体(VS)去除率均达到94%以上,膜出水总挥发性脂肪酸(TVFA)浓度为(103±77)mg/L,其中乙酸浓度为(98±28)mg/L.系统pH 8.26,具有良好的稳定性.膜通量设定为9L/(m2⋅h),运行30d后发生了明显的膜污染,伴随着反应器内挥发性悬浮固体(VSS)浓度由8.1g/L逐渐增加到18/L.在处理高浓度餐厨废水时,AnMBR可以短时间启动且在8.5kgCOD/(m3·d)的高负荷条件下稳定运行,反应器中污泥浓度和溶解性微生物产物的增加导致膜过滤性能下降是导致膜污染的主要因素.In this study,the actual food wastewater was used as raw material to do experiment with an immersed hollow fiber membrane bioreactor(AnMBR) under thermophilic condition(50±1)℃ for 50 days until the membrane fouling occurred.The reactor was started with a hydraulic retention time(HRT) of 20 days,and operated at HRT 15 day s,the system stability and membrane filtration characteristics were studied.The experiment showed that under the above condition,the startup stage can be completed in one month.At HRT 15 days,the methane production reached to 578 L/kgVSin,the total chemical oxygen demand(TCOD) and volatile solid(VS) removal rates were both higher than 94%;no volatile fatty acid(VFA) accumulated with a concentration of(103±77)mg/L of the permeate and dominant with acetate((98±28) mg/L) showed a good stability of the system combined with a pH of 8.26.The membrane flux was set to 9 L/(m2-h),membrane occurred parentally after 30 days with the volatile suspended solids(VSS)concentration gradually increased from 8.1 g/L to 18.0 g/L.Research showed that the AnMBR can start in a short time during treating high concentration food wastewater,and run stable under high organic loading rate such as 8.5 kgCOD/(m3·d).Long time filtration of the membrane leading to an increasing of VSS and soluble microbial products which may be the main reason causing membrane fouling.

关 键 词：餐厨废水 高温厌氧发酵 厌氧膜生物反应器 膜污染 

分 类 号：X703[环境科学与工程—环境工程]