1. 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; 2. Everbright Envirotech(China) Ltd. Nanjing 210007, China
Abstract：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 50days until the membrane fouling occurred. The reactor was started with a hydraulic retention time (HRT) of 20days, and operated at HRT 15days, 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 15days, the methane production reached to 578L/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 9L/(m2·h), membrane occurred parentally after 30days with the volatile suspended solids (VSS) concentration gradually increased from 8.1g/L to 18.0g/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 8.5kgCOD/(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.
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