Feasibility and simulation model of a pilot scale membrane bioreactor for wastewater treatment and reuse from Chinese traditional medicine.
The lack and pollution of water resource make wastewater reuse necessary. The pilot scale long-term tests for submerged membrane bioreactor were conducted to treat the effluents of anaerobic or aerobic treatment process for the high-strength Chinese traditional medicine wastewater. This article was focused on the feasibility of the wastewater treatment and reuse at shorter hydraulic retention time (HRT) of 5.0, 3.2 and 2.13 h. MLSS growth, membrane flux, vacuum values and chemical cleaning periods were also investigated. The experimental results of treating two-phase anaerobic treatment effluent demonstrated that the CODfilt was less than 100 mg/L when the influent COD was between 500-10000 mg/L at HRT of 5.0 h, which could satisfy the normal discharged standard in China. The experimental results to treat cross flow aerobic reactor effluent demonstrated that the average value of CODfilt was 17.28 mg/L when the average value of influent COD was 192.84 mg/L at HRT of 2.13 h during 106 d, which could completely meet the normal standard for water reuse. The maximum MLSS and MLVSS reached 24000 and 14500 mg/L at HRT of 3.2 h respectively. Membrane flux had maximal resume degrees of 94.7% at vacuum value of 0.02 MPa after cleaning. Chemical cleaning periods of membrane module were 150 d. A simulation model of operational parameters was also established based on the theory of back propagation neural network and linear regression of traditional mathematical model. The simulation model showed that the optimum operational parameters were suggested as follows: HRT was 5.0 h, SRT was 100 d, the range of COD loading rate was between 10.664-20.451 kg/(m3xd), the range of MLSS was between 7543-13694 mg/L.
Ren
Nan-qi
NQ
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. rnq@hit.edu.cn
Yan
Xian-feng
XF
Chen
Zhao-bo
ZB
Hu
Dong-xue
DX
Gong
Man-li
ML
Guo
Wan-qian
WQ
D019149:Bioreactors; D003198:Computer Simulation; D003247:Conservation of Natural Resources; D007220:Industrial Waste; D008516:Medicine, Chinese Traditional; D008567:Membranes, Artificial; D016571:Neural Networks, Computer; D010865:Pilot Projects; D014865:Waste Disposal, Fluid / Q000379:methods*
D007220:Industrial Waste; D008567:Membranes, Artificial