不同处理等级污水中氮素对农田土壤环境的影响

通过土柱模型试验，模拟研究了两种处理等级污水中氮素对农田土壤环境的影响。试验结果表明，采用1级处理污水中铵氮基本不会在土壤各层累积和淋溶，而硝氮和总氮则随着灌水次数的增加，向更深层土壤运移、累积和淋溶。对于2级处理污水，由于其各态氮素浓度均比较低，土壤各层浓度也相对较低，土壤中各态氮素浓度为土壤中原有氮素和污水氮素共同作用的结果；随着灌溉次数增加，硝氮和总氮也有向下淋溶的趋势。试验结果还表明，相对于2级处理污水，长时间采用1级处理污水灌溉，将对土壤环境和地下水环境带来高的污染风险。 

Effects of Nitrogen from Sewage with Different Treatment Levels on Farmland Soil Environment

Soil column model experiment was done for simulating two grades wastewater in soil.The characteristic of nitrogen accumulation and leaching in soil were investigated.For primary treatment of wastewater，experimental results showed that the level of ammonium nitrogen in the sewage basic would not accumulate in soil layers and leached while nitrate and total nitrogen concentration would be accumulated and leached in the depth soil with increase of irrigation frequency.For secondary treatment of wastewater，because of the low nitrogen concentration，concentration of each layer of soil was relatively low，and concentration of nitrogen in the soil was result of interaction of nitrogen in soil and nitrogen in sewage.With increase of irrigation times，the nitrate and total nitrogen had a downward trend.The test results also showed that，compared with secondary treatment wastewater，the first stage treatment of sewage irrigation would bring high pollution risk to soil environment and groundwater environment.