The degradation mechanisms of nitrogen and phosphorus in eutrophic water by MABR under the bioturbation of Branchiurasowerbyi

DENG Lian-sen; LI Ya-qun; GAO Jie; YU Xue-song; LIANG Zi-hao; YAO Jing-mei; HAN Le

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China Environmental Science ›› 2026, Vol. 46 ›› Issue (2) : 707-714.

The degradation mechanisms of nitrogen and phosphorus in eutrophic water by MABR under the bioturbation of Branchiurasowerbyi

DENG Lian-sen, LI Ya-qun, GAO Jie, YU Xue-song, LIANG Zi-hao, YAO Jing-mei, HAN Le

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Abstract

The dominant benthic macroinvertebrate species in eutrophic lakes, Branchiurasowerbyi, and polypropylene (PP)-based membrane aerated biofilm reactor (MABR) were selectedin this study, where based oncontrolled microcosm experiments, we explored the effects of benthic bioturbationon dissolved oxygen (DO) concentration in overlying water, DO infiltration depth in the sediments, and the removal of total organic carbon (TOC), nitrogen (NH₄⁺-N, NO₃^--N, NO₂^--N and TN), and phosphorus (PO₄^3--P and TP) by MABR. While the perturbation ofB. sowerbyi enhanced Nand Prelease and reduced DO concentrations, the MABR effectively maintained a high level of reoxygenation performance, significantly increasing the DO infiltration depth in the sediments.The removal rates of NH₄⁺-N, TN, and TP remained high at 93.4%, 83.27%, and 90.80%, respectively, demonstrating significant improvements compared to the control group and the B. sowerbyi-only group.Hence, MABR system in removing N and P could effectively cope with the perturbation of B. sowerbyi in eutrophic water bodies.

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eutrophic water / bioturbation / Branchiurasowerbyi / MABR / nitrogen and phosphorus removal

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DENG Lian-sen, LI Ya-qun, GAO Jie, YU Xue-song, LIANG Zi-hao, YAO Jing-mei, HAN Le. The degradation mechanisms of nitrogen and phosphorus in eutrophic water by MABR under the bioturbation of Branchiurasowerbyi[J]. China Environmental Science. 2026, 46(2): 707-714

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