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| 两种典型温度下农村化粪池出水氮素在原地土壤中的迁移转化过程 |
| The in-situ translocation and transformation of the nitrogen of rural septic tank effluent in the soil at two typical temperatures |
| 投稿时间：2018-06-02 |
| DOI：10.13254/j.jare.2018.0145 |
| 中文关键词: 化粪池，氮素，硝化作用，吸附-解吸 |
| 英文关键词: septic tank, nitrogen, nitrification, adsorption-desorption |
| 基金项目:国家水体污染控制与治理科技重大专项（2012ZX07506-007）；国家自然科学基金项目（41603077）；南通市重点实验室项目（CP12016005）；江苏省大学生创新训练计划项目（201710304078Y，201810304037Z）；中央级公益性科研院所基本科研业务专项（201509038） |
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| 中文摘要: |
| 为探究典型温度下（25℃和5℃）农村化粪池出水氮素在排污口原地土壤中的迁移转化过程，采集原地表层土壤及化粪池出水，构建室内模拟系统，分析化粪池出水经土壤渗滤前后氮素组成。结果表明，农村化粪池出水氮素以可溶性无机氮（DIN）为主，其中NH4+-N占70%以上；两种温度条件下化粪池出水DIN差异不显著（P>0.05，n=12），NH4+-N、NO2--N、NO3--N浓度均具有极显著性差异（P<0.01，n=12），25℃时硝化作用明显，导致出水NH4+-N低于5℃，NO2--N、NO3--N高于5℃；两种温度条件下原地土壤对化粪池出水DIN均有削减作用，其中NH4+-N削减量均占DIN削减量60%以上；25℃和5℃条件下，NH4+-N削减率分别为23.11%~47.37%和25.37%~43.47%；25℃时NH4+-N削减主要通过氨挥发、反硝化、厌氧氨氧化等作用完成，而5℃时NH4+-N削减主要通过土壤NH4+-N吸附作用完成；25℃时土壤对NO3--N还存在蓄积作用。研究表明，两种温度下化粪池出水NO2--N和NO3--N在原地土壤中可发生反硝化或异化还原作用进而得到削减。 |
| 英文摘要: |
| With the purpose to estimate the in-situ translocation and transformation of nitrogen of rural septic tank effluent in the soil at two typical temperatures(25℃ and 5℃), an indoor simulation system was constructed with effluent sample collected from a rural septic tank and in-situ surface soil at the sewage drain, and the transformation of nitrogen of sewage through soil filtration process was discussed. The results showed that, the nitrogen of rural septic tank effluent was mainly dissolved inorganic nitrogen(DIN), and NH4+ -N accounted for more than 70% of DIN, an insignificant difference(P>0.05, n=12) in DIN concentrations and a significant difference(P<0.01, n=12) in NH4+-N, NO2--N and NO3--N concentrations in effluent between the two temperatures were found. The concentration of NH4+-N in effluent at 25℃ was lower than 5℃, but NO2--N and NO3--N were higher due to the stronger nitrification. DIN reduction was found in soil at both two temperatures, and more than 60% of which was NH4+-N. After soil infiltration, the reduction rate of NH4+-N was 23.11%~47.37% at 25℃, and 25.37%~43.47% at 5℃. The NH4+-N was mainly eliminated by ammonia volatilization, denitrification, anammox and so on at 25℃, while by the adsorption effect of soil on NH4+-N at 5℃ principally. Besides, soil could also accumulate NO3--N at 25℃. |
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