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| Continuous methane fermentation of swine wastewater using a flat sheet membrane bio-reactor |
| QIAO Wei1,2, JIANG Meng-meng1,2, Wandera S M1,2, XIONG Lin-peng1,2, REN Zheng-ran1,2, DONG Ren-jie1,2,3 |
1. College of Engineering, China Agricultural University, Beijing 100083, China;
2. R & D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee(BGFeuls) Beijing 100083, China;
3. Institute of Yantai, China Agricultural University, Yantai 264670, China |
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Abstract A 180-days¢ continuous experiment with anaerobic membrane reactor (AnMBR) were carried out to treat swine wastewater at mesophilic condition. The organic loading rate (OLR) was increased by shortening the hydraulic retention time (HRT) stepwise through 5, 3 and 2 days. The gas production and performance of AnMBR, specific methanogenic activity (SMA) at different HRTs of the membrane reactor and performance of membrane filtration was studied in this research. With the shortening of HRTs, gas production rate increased from 0.68 to 1.03 and 1.12 L/(L·d). While the TVFA of permeate was less than 500mg/L at the whole operation, which was (169±41) mg/L, (15±3) mg/L and (114±45) mg/L, respectively. Acetate was the main part. The best specific methanogenesis was got at HRT 3days whose value was 1.127g-COD/(g-VSS·d) at 2000mg/L acetate acid concentration. A cycle of membrane fouling was about 4months. The membrane filtration was then recovered by soaking the membrane sheet with 2% citric acid for 3hours. Under the lower flux, the sludge concentration of 7~32g/L in the reactor did not significantly affect the filtration performance of the flat-sheet membrane.
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Received: 03 May 2018
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