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| Direct treatment and organics recovery of municipal wastewater via high loaded bioflocculation membrane reactor |
| WAN Li-guo1,2, LIN Qiao1, ZHANG Wen-hua1,2, REN Zhi-min1,2, LONG Bei-sheng1,2, XIONG Ling1 |
1. School of Water Conservancy & Environment Engineering, Changchun Institute of Technology, Changchun 130012, China;
2. Jilin Provincial Key Laboratory of Municipal Wastewater Treatment, Changchun Institute of Technology, Changchun 130012, China |
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Abstract A high loaded bioflocculation membrane reactor (HLB-MR) was constructed using a hollow fiber ultrafiltration membrane module, and its performance for direct treatment and organics recovery of municipal wastewater was investigated. When the HLB-MR operated at the solid retention time (SRT) of 0.2d and the hydraulic retention time (HRT) of 1.0h, this process could recover 60.8% of influent total COD (CODTO). It was estimated that about 39% of influent CODTO could be converted to methane for energy recovery by mesophilic anerobic digestion of concentrate, and the methane conversion rate of organics was twice more than that of the residual sludge in the activated sludge process. Thus, HLB-MR could achieve efficient organics recovery and utilization from municipal wastewater. The COD of permeate water from HLB-MR was stable at around 30mg/L, while phosphorus and nitrogen were largely conserved. Since the permeate water was free from solids and pathogens, which could be used as an excellent source of irrigation water for reuse. When HLB-MR operated under short SRTs of 0.2, 0.6 and 1.0d, the flocculation efficiency of colloidal COD could reach 81.9%, 95.1% and 96.8%, respectively. The higher flocculation efficiency will lead to the lesser membrane fouling, so that the significant bioflocculation can effectively reduce membrane fouling and ensure stable operation of HLB-MR.
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Received: 20 September 2018
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