Abstract
Severe membrane fouling and limited effect of biological phosphorus removal are the major drawbacks for anoxic-oxic membrane bioreactor (A/O-MBR). The dosing of poly-aluminum chloride in A/O-MBR can reduce membrane fouling and improve phosphorus removal certainly, but it may bring potential impacts on the specific oxygen uptake rate of sludge and the activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria with accumulated aluminum. Controlling sludge retention time (SRT) was firstly investigated to evaluate the effect on alleviating inhibition caused by accumulated aluminum in A/O-MBR. As compared to the performance without dosing of poly-aluminum chloride, the effluent ammonia concentration in the SRT-15d reactor was increased by 91.80% lower than that of SRT-30d reactor (111.84%). Due to higher sludge yield rate in the SRT-15d reactor, the amount of accumulated aluminum was 39.33 mg Al g−1 VSS less than that of the SRT-30d reactor. Besides, the decline of the activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in the SRT-15d reactor was 4.4% and 18.3%, respectively lower than that of the SRT-30d reactor. Therefore, controlling shorter SRT can be used as an effective tool to alleviate inhibition of nitration and nitrosation by accumulated aluminum in A/O-MBR.
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