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Purification of seawater aquaculture using constructed wetlands in a recirculating aquaculture system for Pacific white shrimp (Litopenaeus vannamei) and analysis of microbial community structure

文献类型： 外文期刊

作者： Wang, Yanyan 1 ; Hu, Meimei 1 ; Chen, Jianlei 2 ; Cui, Hongwu 2 ; Zhu, Shengmin 4 ; Jin, Tongtong 4 ; Qu, Keming 2 ; Cui, Zhengguo 2 ;

作者机构： 1.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao 266071, Peoples R China

3.Qingdao Marine Sci & Technol Ctr, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266237, Shandong, Peoples R China

4.Ocean Univ China, Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

关键词： Constructed wetlands; Recirculating aquaculture system; Purification efficiency; Microbial community

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 66 卷

页码：

收录情况： SCI

摘要： In this study, a constructed wetland recycling system was selected to treat aquaculture water from shrimp production. The impact of different culture densities, hydraulic retention times (HRTs), and treatment units on purification effect was examined. Furthermore, high-throughput sequencing was used to analyze the composition of microbial communities in the roots of constructed wetland plants and each substrate, shedding light on the purification mechanism of the system. Results indicated that the removal rates of NH4+-N, NO2--N, and COD increased with increasing cultivation density, peaking at 180 tails/m(3), while PO43--P achieved the maximum at 90 tails/m(3). Although the average removal rate of NO3--N was 9.81 % for the first 20 days, it showed a cumulative state later. Removal rates of NH4+-N, NO2--N, and COD fluctuated, first increasing and then decreasing with increasing HRT. The removal rate of PO43--P declined, and the concentration change of NO3--N was the same as that observed under different cultivation densities, showing a cumulative phenomenon. The most optimal HRT in this system was 6 h. At a cultivation density of 180 tails/m(3) and HRT of 6 h, the multistagecompound vertical-flow constructed wetland exhibited the highest removal effects on NH4+-N, NO2--N, PO43--P, and COD, followed by the primary and secondary plant purification ponds. High-throughput sequencing revealed high richness and diversity in plant roots, coarse sand, and slag layers. Owing to their larger particle size and surface area, the crushed stone layers had the lowest richness and diversity. beta-diversity analysis found similar microbial community compositions in the downstream and upstream pond plant root, coarse sand, slag, and crushed stone layers. This research can provide theoretical and technical references for high-efficiency purification of seawater aquaculture waters by constructed wetland systems.

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