College of Life Science, Shenyang Normal University, Shenyang 110034, China E-mail:
Water Sci Technol. 2020 Feb;81(4):668-678. doi: 10.2166/wst.2020.141.
Wastewater ecological soil infiltration system (WESIS) is a land treatment technology for decentralized wastewater treatment that has been applied all over the world. In this study, the pollutant removal, emission of greenhouse gases (GHGs) and functional gene abundances with different influent C/N ratios were evaluated in WESISs with/without intermittent aeration. Intermittent aeration and influent C/N ratio affect pollutant removal and GHG emission. Increased influent C/N ratio led to high total nitrogen (TN) removal, low CH and NO emission in the aerated WESIS, which was different from the non-aerated WESIS. High average removal efficiencies of chemical oxygen demand (COD) (94.8%), NH -N (95.1%), TN (91.2%), total phosphorus (TP) (91.1%) and low emission rates for CH (27.2 mg/(m d)) and NO (10.5 mg/(m d)) were achieved with an influent C/N ratio of 12:1 in the aerated WESIS. Intermittent aeration enhanced the abundances of bacterial 16S rRNA, amoA, nxrA, narG, napA, nirK, nirS, qnorB, nosZ genes and decreased the abundances of the mcrA gene, which are involved in pollutant removal and GHG emission. Intermittent aeration would be an effective alternative to achieving high pollutant removal and low CH and NO emission in high influent C/N ratio wastewater treatment.
污水生态土壤渗滤系统（WESIS）是一种用于分散式污水处理的土地处理技术，已在全球范围内得到应用。本研究评估了不同进水 C/N 比下，间歇曝气和无间歇曝气 WESIS 中的污染物去除、温室气体（GHGs）排放和功能基因丰度。间歇曝气和进水 C/N 比会影响污染物去除和 GHG 排放。增加进水 C/N 比会导致曝气 WESIS 中总氮（TN）去除率高，CH 和 NO 排放量低，而在非曝气 WESIS 中则不同。在曝气 WESIS 中，进水 C/N 比为 12:1 时，COD（94.8%）、NH -N（95.1%）、TN（91.2%）、TP（91.1%）的平均去除效率较高，CH（27.2 mg/（m d））和 NO（10.5 mg/（m d））的排放率较低。间歇曝气增强了参与污染物去除和 GHG 排放的细菌 16S rRNA、amoA、nxrA、narG、napA、nirK、nirS、qnorB、nosZ 基因的丰度，降低了 mcrA 基因的丰度。间歇曝气是实现高进水 C/N 比下高污染物去除和低 CH 和 NO 排放的有效替代方法。
