How do aeration mode and influent carbon/nitrogen ratio affect pollutant removal, gas emission, functional genes and bacterial community in subsurface wastewater infiltration systems?

IF 2.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Water Science and Technology Pub Date : 2023-12-01 DOI:10.2166/wst.2023.383

Lei Zhang, Zhixi Cao, Bingqian Yan, Ziqi Li, Jing Pan, Linlin Fan

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Abstract

This study investigated the influences of aeration mode and influent carbon/nitrogen ratio on matrix oxygen concentration, pollutant removal, greenhouse gas emission, functional gene abundances and bacterial community in subsurface wastewater infiltration systems (SWISs). Intermittent or continuous aeration enhanced oxygen supply at 0.6 m depth in the matrix, which improved organics removal, nitrogen removal, the abundances of bacterial 16S rRNA, amoA, nxrA, narG, napA, nirK, nirS, norB, nosZ genes, bacterial community Alpha diversity, the relative abundances of Actinobacteria at 0.6 m depth, the relative abundances of Chloroflexi, Gemmatimonadetes, Bacteroidetes and Firmicutes at 0.9 and 1.2 m depth and reduced CH₄ and N₂O conversion efficiencies, the abundance of mcrA gene with carbon/nitrogen ratio of 12 and 16 compared with non-aeration. Increased carbon/nitrogen ratio resulted in higher TN removal efficiencies and lower CH₄ and N₂O conversion efficiencies in aeration SWISs than those in non-aeration SWIS. Intermittent aeration SWIS obtained high removal efficiencies of 83.2, 85.4 and 90.8% for TN, NH₄⁺ -N and COD and low conversion efficiency of 0.21 and 0.65% for N₂O and CH₄ with optimal carbon/nitrogen ratio of 12. However, high TN (82.6%), NH₄⁺ -N (84.9%) and COD (92.2%) removal efficiencies and low CH₄ (0.67%) and N₂O (0.23%) conversion efficiencies were achieved in continuous aeration SWIS with carbon/nitrogen ratio of 16.

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曝气模式和进水碳氮比如何影响地下污水渗透系统中的污染物去除、气体排放、功能基因和细菌群落？

本研究探讨了曝气模式和进水碳氮比对地下污水渗透系统（SWIS）基质氧浓度、污染物去除率、温室气体排放量、功能基因丰度和细菌群落的影响。间歇或持续曝气提高了基质 0.6 米深处的氧气供应，从而提高了有机物去除率、氮去除率、细菌 16S rRNA、amoA、nxrA、narG、napA、nirK、nirS、norB、nosZ 基因丰度、细菌群落 Alpha 多样性、放线菌在 0.与不通气相比，碳氮比为 12 和 16 时，CH4 和 N2O 转化效率、mcrA 基因的丰度降低。与不曝气的 SWIS 相比，碳氮比的增加导致曝气 SWIS 的 TN 去除率提高，CH4 和 N2O 转化率降低。在最佳碳氮比为 12 时，间歇曝气 SWIS 对 TN、NH4+-N 和 COD 的去除率分别为 83.2%、85.4%和 90.8%，而对 N2O 和 CH4 的转化率分别为 0.21%和 0.65%。然而，在碳/氮比为 16 的连续曝气 SWIS 中，TN（82.6%）、NH4+ -N（84.9%）和 COD（92.2%）的去除率较高，CH4（0.67%）和 N2O（0.23%）的转化率较低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Science and Technology 环境科学-工程：环境

CiteScore

4.90

自引率

3.70%

发文量

366

审稿时长

4.4 months

期刊介绍： Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.