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
作者： Wang, Lu 1 ; Liu, Jun 3 ; Lin, Xiaodan 4 ; Liu, Zhihao 1 ; Cui, Hongwu 2 ; Zhang, Ying 5 ;
作者机构： 1.Laoshan Lab, Qingdao 266237, Peoples R China
2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China
3.Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Peoples R China
4.Natl Marine Environm Monitoring Ctr, Dalian 116023, Peoples R China
5.Ocean Univ China, Qingdao 266100, Peoples R China
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
页码：
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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