Stable operation of aerobic granular sludge continuous flow system——by controlling reflux ratio and organic load

LI Dong; YANG Jing-wei; LI Yue; ZHANG Jie

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China Environmental Science ›› 2021, Vol. 41 ›› Issue (9) : 4149-4156.

Water Pollution Control

Stable operation of aerobic granular sludge continuous flow system——by controlling reflux ratio and organic load

LI Dong¹, YANG Jing-wei¹, LI Yue¹, ZHANG Jie^1,2

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Abstract

Inoculate mature aerobic granular sludge at room temperature in an anaerobic/aerobic alternate continuous flow system composed of independent anaerobic tanks and aerobic tanks, control the effect of mixed liquid reflux ratio and organic load on the removal of COD, TN and TP by anaerobic and aerobic alternating continuous flow process. The results showed that the two-stage continuous flow process can achieve better nitrogen and phosphorus removal performance by adjusting a lower reflux ratio when the influent organic load was low. The average concentration of COD, TN and TP in the effluent was 18.78, 5.79 and 0.49mg/L. The average removal rate was 93.76%, 84.3% and 83.12% respectively; when the organic load was higher, the long-term two-stage continuous flow system lacked the environmental stress of feast and famine, resulting in filamentous bacteria growth, deterioration of system performance. The model was used to characterize the granular sludge and system effluent at different stages. The results showed that the organic load has a greater impact on the production of intermediate products related to the utilization of foreign substrates. The influent with lower organic load could effectively reduce the generation of intermediate products in the effluent. In summary, in the actual secondary urban sewage treatment plant, the anaerobic/aerobic alternating continuous flow process was not suitable for long-term operation under the organic concentration (500mg/L) of the emission limit.

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aerobic granular sludge continuous flow / anaerobic and aerobic alternate / organic loads / reflux ratio

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LI Dong, YANG Jing-wei, LI Yue, ZHANG Jie. Stable operation of aerobic granular sludge continuous flow system——by controlling reflux ratio and organic load[J]. China Environmental Science. 2021, 41(9): 4149-4156

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