Experimental study on MnO2 promoting start-up of ANAMMOX process
In order to investigate the promotional effect of MnO2 addition on start-up effect and denitrification performance of ANAMMOX process,by changing hydraulic load and adopting step-by-step domestication means to add MnO2(0-50 mg/L)to the reactor,the tolerance of anaerobic ammonia oxidation sludge to MnO2 was gradually improved and the ANAMMOX reactor was successfully started-up for 90 d of operation.The removal rates of NH4+-N and NO2-N were stabilized at 78％and 98％respectively,the NLR was enhanced to 0.855 kg/(m3·d),the NRR was stabilized at about 0.718 kg/(m3·d),and the mass ratios of NO2--N to NH4+-N and NO3--N to NH4+-N were stabilized at 1.32 and 0.20 respectively,and the maximum value of SAA was 269.86 mg[N]/(g[VSS]·d),and the microbial community structure analysis using high-throughput sequencing technology showed that the genus AnAOB accounted for 8.92％,and became the dominant genus.Compared to the traditional ANAMMOX process,the addition of MnO2 can promote the enrichment of AnAOB and strengthen the activity of AnAOB,which can provide a reference for the wide application of ANAMMOX process in practice.
MnO2ANAMMOXbiological nitrogen removalUASB reactormicrobial community structureAnAOB activity
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