Enhanced denitrifying phosphorus removal in novel multistage anoxic-oxic process

LU Rei-peng; XU Wen-jiang; LI An-feng; Dong Na

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China Environmental Science ›› 2022, Vol. 42 ›› Issue (4) : 1706-1713.

Water Pollution Control

Enhanced denitrifying phosphorus removal in novel multistage anoxic-oxic process

LU Rei-peng, XU Wen-jiang, LI An-feng, Dong Na

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Abstract

Based on the multistage anoxic-oxic (MAO) process and the theory of denitrifying phosphorus removal, a noval MAO process (DPR-MAO) with ability of denitrifying phosphorus removal was designed. In this study, the nitrogen and phosphorus removal performance and the microbial community characteristics of each reaction tank were investigated. During period of stable operation, the average COD, TN, NH₄⁺-N and TP concentration in effluent were 7.07, 9.04, 0.34 and 0.49mg/L, respectively. Meanwhile, the average removal efficiecny of COD, TN, NH₄⁺-N and TP were 98%, 87%, 99% and 93%, respectively. The effluent quality of DPR-MAO process could meet the first A level of the "Discharge standard of pollutants for municipal wastewater treatment plant” (GB 18918~2002). High-throughput sequencing results suggested that Proteobacteria, Bacteroidetes and Chloroflexi were the dominant phyla in each reaction tank, accounting for 61.85% ~ 75.58%、16.39% ~ 22.60% and 1.52% ~ 4.76% of the total phyla, respectively. Further analysis at the genus level found that Thiothrix, Comamonas, Candidatus Accumulibacter and Pseudomonas were the dominant genus for denitrifying phosphorus removal. The DPR-MAO process realized the enrichment of denitrifying phosphorus accumulating organisms and the efficient removal of nitrogen and phosphorus from wastewater.

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denitrifying phosphorus removal / high throughput sequencing / microbial community / multistage anoxic-oxic / nitrogen and phosphorus removal

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LU Rei-peng, XU Wen-jiang, LI An-feng, Dong Na. Enhanced denitrifying phosphorus removal in novel multistage anoxic-oxic process[J]. China Environmental Science. 2022, 42(4): 1706-1713

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