Simultaneous removal of nitrogen and phosphorus from mariculture wastewater by mixotrophic-denitrification biofilm process based on pyrite and poly-3-hydroxybutyrate-co-hyroxyvelate

文献类型： 外文期刊

第一作者： Wang, Lu

作者： Wang, Lu;Liu, Zhihao;Cui, Hongwu;Liu, Jun;Lin, Xiaodan;Zhang, Ying

作者机构：

关键词： Mariculture wastewater; Mixotrophic denitrification; Pyrite; PHBV; Simultaneous nitrogen and phosphorus; removal

期刊名称：JOURNAL OF WATER PROCESS ENGINEERING （ 影响因子：6.7； 五年影响因子：6.7 ）

ISSN： 2214-7144

年卷期： 2024 年 68 卷

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收录情况： SCI

摘要： This study presents a systematic investigation on pyrite-driven autotrophic denitrification (PAD) and pyrite/ poly-3-hydroxybutyrate-co-hyroxyvelate (PHBV)-driven mixotrophic denitrification (PPMD) for removing nitrate (NO3 --N) and phosphate (PO43- -P) from mariculture wastewater. PAD and PPMD biofilm reactors were operated for 195 days to assess their operation performance and NO3 --N removal kinetics as well as the contributions of PAD and PHBV-driven heterotrophic denitrification (PHBV-HD) to the NO3 --N and PO4 3--P removal in the PPMD reactor. Compared to the PAD reactor, the PPMD reactor had higher NO3 - -N removal efficiency (34.1 %-88.8 %) and rate (82.0-541.6 mg L- 1 d- 1) but lower PO4 3- -P removal efficiency (17.1 %-94.5 %) and rate (9.0-60.7 mg L- 1 d- 1), and yielded less sulfate but more acidity and residual DOC. HRT (0.5-4.0 h), influent NO3 --N concentration (25-150 mg L- 1) and temperature (10-30 degrees C) significantly affected the NO3 --N and PO4 3--P removal performance of both PAD and PPMD reactors, while influent DO concentration (0.1-7.5 mg L- 1) did not. A zeroorder kinetic model well described the NO3 --N removal in the PAD reactor, but the optimal kinetic model for the PPMD reactor shifted from half-order to zero-order with increasing influent NO3 --N concentration. PHBV-HD contributed 65.6 % f 0.4 %-72.2 % f 1.2 % to the NO3 - -N removal in the PPMD reactor under different operational conditions, followed by PAD (27.8 % f 1.2 %-34.4 % f 0.4 %). PAD played a dominant role in the PO4 3--P removal in the PPMD reactor, whose contribution (69.5 % f 4.7 %-98.3 % f 2.3 %) was impacted by HRT, influent NO3 --N concentration, and temperature. This study highlights the PPMD potential for controlling the NO3 --N and PO4 3--P pollution associated with mariculture wastewater.

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