Influence of the filler addition method on characteristics of operation stability and membrane fouling in MBR
FAN Jiawen1,, YANG Yongzhe1,,, YANG Hongbo2, LI Yaguo2 1.School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2.Shaanxi Microbe Biotechnology Co. Ltd., Weinan 714000, China
Abstract:To improve MBR removal performance and alleviate membrane fouling, the hybrid suspended biofilm enhanced-membrane bioreactor (HSBE-MBR) was employed for biopharmaceutical wastewater treatment. The aim of the study was to explore the effect of the filler addition method on the removal characteristics of typical pollutants, operation stability and membrane fouling and to determine the membrane fouling mechanism. Results showed that the average removal efficiencies of TCOD, ${\rm{NH}}_4^ + $-N and TN were 91.61%, 97.08% and 79.40%, respectively when the fillers were added in the anoxic and oxic zone (condition 1). The average removal efficiencies of TCOD, ${\rm{NH}}_4^ + $-N and TN were 91.09%, 97.24% and 83.66%, respectively when the fillers were added in the anoxic, oxic and membrane zone (condition 2). Under above two conditions, HSBE-MBR had good performance on TCOD, ${\rm{NH}}_4^ + $-N and TN removal, and maintained the good operation stability, TN removal efficiency increased by 4.26% under condition 2. HSBE-MBR operation time increased from 0.02~8.17 d (condition 1) to 0.26~138 d (condition 2). Cake formation was identified as the main membrane fouling mechanism under conditions 1 and 2, and their cake resistance ratios were 94.7% and 90.1%, respectively. The fillers added in membrane zone could effectively mitigate the cake formation on the membrane surface, and reduce the cake resistance by 8.07%. Meanwhile, the concentrations of soluble microbial product (SMP), loosely bound-EPS (LB-EPS) and tightly bound-EPS (TB-EPS) in the sludge mixed liquor were reduced from (63.70±12.95), (13.97±2.03) and (153.82±12.64) mg·g?1 (condition 1) to (31.77±3.17), (9.11±0.40) and (78.12±18.92) mg·g?1 (condition 2), respectively. The result of particle size distribution showed that the average particle size of the sludge increased from 31.35 μm (condition 1) to 34.71 μm (condition 2) when adding the fillers in the membrane zone. According to the characteristics of pollutants removal and membrane fouling, the optimal method of the fillers addition is to add them in the anoxic, oxic and membrane zone. This provides the reference for further improvement of the operation stability and membrane fouling alleviation of MBR. Key words:hybrid suspended biofilm enhanced-membrane bioreactor(HSBE-MBR)/ biopharmaceutical wastewater/ method of filler addition/ membrane fouling/ characteristic of mixed liquor.
图1HSBE-MBR实验装置图 Figure1.Schematic diagram of the HSBE-MBR
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1.School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2.Shaanxi Microbe Biotechnology Co. Ltd., Weinan 714000, China Received Date: 2019-10-14 Accepted Date: 2019-12-24 Available Online: 2020-08-12 Keywords:hybrid suspended biofilm enhanced-membrane bioreactor(HSBE-MBR)/ biopharmaceutical wastewater/ method of filler addition/ membrane fouling/ characteristic of mixed liquor Abstract:To improve MBR removal performance and alleviate membrane fouling, the hybrid suspended biofilm enhanced-membrane bioreactor (HSBE-MBR) was employed for biopharmaceutical wastewater treatment. The aim of the study was to explore the effect of the filler addition method on the removal characteristics of typical pollutants, operation stability and membrane fouling and to determine the membrane fouling mechanism. Results showed that the average removal efficiencies of TCOD, ${\rm{NH}}_4^ + $-N and TN were 91.61%, 97.08% and 79.40%, respectively when the fillers were added in the anoxic and oxic zone (condition 1). The average removal efficiencies of TCOD, ${\rm{NH}}_4^ + $-N and TN were 91.09%, 97.24% and 83.66%, respectively when the fillers were added in the anoxic, oxic and membrane zone (condition 2). Under above two conditions, HSBE-MBR had good performance on TCOD, ${\rm{NH}}_4^ + $-N and TN removal, and maintained the good operation stability, TN removal efficiency increased by 4.26% under condition 2. HSBE-MBR operation time increased from 0.02~8.17 d (condition 1) to 0.26~138 d (condition 2). Cake formation was identified as the main membrane fouling mechanism under conditions 1 and 2, and their cake resistance ratios were 94.7% and 90.1%, respectively. The fillers added in membrane zone could effectively mitigate the cake formation on the membrane surface, and reduce the cake resistance by 8.07%. Meanwhile, the concentrations of soluble microbial product (SMP), loosely bound-EPS (LB-EPS) and tightly bound-EPS (TB-EPS) in the sludge mixed liquor were reduced from (63.70±12.95), (13.97±2.03) and (153.82±12.64) mg·g?1 (condition 1) to (31.77±3.17), (9.11±0.40) and (78.12±18.92) mg·g?1 (condition 2), respectively. The result of particle size distribution showed that the average particle size of the sludge increased from 31.35 μm (condition 1) to 34.71 μm (condition 2) when adding the fillers in the membrane zone. According to the characteristics of pollutants removal and membrane fouling, the optimal method of the fillers addition is to add them in the anoxic, oxic and membrane zone. This provides the reference for further improvement of the operation stability and membrane fouling alleviation of MBR.
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