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| Enhancement of nitrogen and phosphorus removal in ceramic membrane bioreactorfor rural sewage treatment |
| Received:September 10, 2018 |
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| KeyWord:rural domestic sewage treatment;MBR;ceramic membrane;nitrogen removal enhancement;packing adsorption |
| Author Name | Affiliation | E-mail | | TANG Shu-wen | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | JI Jing | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | WANG Meng-xian | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | CHEN Jia-yi | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | LI Xu-dong | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | QIU Jiang-ping | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | qjp@sjtu.edu.cn |
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| Abstract: |
| The traditional Membrane Bio-reactor (MBR) is one of the most important treatment methods for rural sewage, but its nitrogen and phosphorus removal efficiency is rather low. Ceramic Membrane Bio-reactor (C-MBR) combines aerobic biological reaction with inorganic flat ceramic membrane filtration, and it requires less maintenance and has less sludge discharge. In this study, the ceramic membrane was used instead of traditional organic membrane. A series of experiments were conducted to study the enhancement of nitrogen removal in C-MBR by optimizing the reflux ratio,dissolved oxygen (DO), hydraulic retention time (HRT), porous filler adsorption was also used to enhance phosphorus removal in C-MBR. When operated under certain condition, the concentrations of chemical oxygen demand (COD), total nitrogen (TN), ammonium nitrogen (NH3-N) and total phosphorus (TP) of inflow were 360.00~661.00, 33.90~57.60, 16.80~32.30 and 4.78~5.77 mg·L-1, respectively; the corresponding average concentrations of outflow were 34.90, 22.59, 1.13 and 4.57 mg·L-1, respectively, and the average removal rates were 93.68%, 47.86%, 95.0% and 12.32%, respectively. When the reflux ratio was optimized to 200%, the DO was 2.00 mg·L-1 and the HRT in the aerobic tank was 4 h, the nitrogen removal of C-MBR was strengthened, and the best TN average removal rate could reach 69.39%, and the corresponding average concentration of outflow was 12.52 mg·L-1. The packing absorption could strengthen phosphorus removal. When operated under optimal hydraulic load in packing absorption tank, which was 0.33 m3·m-3·d-1, the removal rate of TP could reach 90.90%, and the average TP concentration in outflow was 0.42 mg·L-1. In addition, 1000 mg·L-1 sodium hypochlorite solution had the best cleansing effect when the film was cleaned online at a speed of 500 m·30 min-1 each film, since the membrane had the quickest recovery from pollution under this condition. Our results provide reference for rural domestic sewage treatment as well as MBR nitrogen and phosphorus removal enhancement. |
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