State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong 266071, China; Laoshan Laboratory, Qingdao 266237, China.
State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong 266071, China.
Mar Pollut Bull. 2024 Aug;205:116559. doi: 10.1016/j.marpolbul.2024.116559. Epub 2024 Jun 8.
This study investigated the effect of hydraulic retention time (HRT) on the denitrification performance and microbial composition of reactors, packed with composite polycaprolactone and corncob carbon sources, during the treatment mariculture wastewater. The optimal HRT was 3 h, and average nitrogen removal efficiency was 99.00 %, 99.07 %, and 98.98 % in the HRT =3, 5, and 7 h groups, respectively. However, the 3 h group (DOC 2.91 mg/L) was the only group with a lower DOC concentration than that of the influent group (3.31 mg/L). Moreover, species richness was lower at HRT =3 h, with a greater proportion of denitrification-dominant phyla, such as Proteobacteria. The abundance of the NarG, NirK, and NirS functional genes suggested that the HRT =3 h group had a significant advantage in the nitrate and nitrite reduction phases. Under a short HRT, the composite carbon source achieved a good denitrification effect.
本研究考察了水力停留时间（HRT）对填充复合聚己内酯和玉米芯碳源的反应器的反硝化性能和微生物组成的影响，用于处理海水养殖废水。最佳 HRT 为 3 h，在 HRT = 3、5 和 7 h 组中，平均氮去除效率分别为 99.00%、99.07%和 98.98%。然而，只有 HRT = 3 h 组（DOC 2.91 mg/L）的 DOC 浓度低于进水组（3.31 mg/L）。此外，HRT = 3 h 时的物种丰富度较低，具有更多的反硝化优势菌门，如变形菌门。NarG、NirK 和 NirS 功能基因的丰度表明，在硝酸盐和亚硝酸盐还原阶段，HRT = 3 h 组具有显著优势。在短 HRT 下，复合碳源实现了良好的反硝化效果。
