| Abstract |
| Water temperature is a critical factor that influences the biological performance of activated sludge systems, affecting treatment rates and microbial composition. This experiment assessed the performance of an anoxic-selector-aerobic membrane bioreactor (MBR) system for treating domestic wastewater with varying water temperatures (8-23℃) and a hydraulic retention time (HRT) of 6 h. The MBR used two plate-type membrane modules with an effective pore size of 0.4 um. The wastewater characteristics included night-soil content (pH 6.8±0.5, BOD 145.6±41.2 mg/L, COD 95.6±22.6 mg/L, SS 151.6±51.0 mg/L, color 213.6±112.1 unit, T-N 37.232±11.437 mg/L). The results indicated substrate residual ratios ranging from 0.03-0.18 for BOD, 0.05-0.21 for COD, 0.07-0.33 for NH4-N, and 0.25-0.55 for NO3-N. Notably, the upper membrane module exhibited a 10-20% lower substrate residual ratio than the lower membrane module in the aerobic MBR, attributed to hydraulic shear forces generated by aeration through the bottom diffuser of the reactor. Permeate flux increased with increasing water temperature, and transmembrane pressure (TMP) at temperatures above 10℃ was 30% lower than that at temperatures below 10℃. These findings highlight the role of water temperature in substrate reduction and TMP in aerobic MBR, emphasizing its impact on overall system efficiency. |
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| Key Words |
| Anoxic-aerobic membrane bioreator system, HRT, Permeate flux, Residual ratio, Substrate reduction behaviour, TMP, Water temperature, 무산소-호기MBR시스템, 수리학적체류시간, 투과속도, 잔존비, 기질저감거동, 막간차압, 수온 |
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