甘肃中部干旱地区生活污水灌溉可行性分析

Feasibility Study on Domestic Sewage Irrigation in the Arid Region of Central Gansu

以国家级贫困县——甘肃省榆中县夏关营村农业灌溉为研究对象,通过田间试验分析比较了污水灌区与井水灌区灌溉用水成分、土壤理化性状以及玉米长势和产量,分析了榆中县生活污水灌溉农田的可行性。结果表明,生活污水氨氮、COD、总磷含量远高于井水。长期用生活污水灌溉的土壤碱解氮、有机质含量比井水灌溉土壤分别提高了106.4%和6.4%,速效磷含量减少了7.9%,污灌对土壤养分含量总体有所提高。污水灌区土壤容重小,含水率高,盐分含量小于0.1 g/kg,污灌在有效改善土壤环境的同时并未引起盐渍化。污水灌区玉米的长势优于井水灌区,污水灌区玉米干重比井水灌区高7.4%,有效提高了玉米的产量。干旱区生活污水灌溉具有一定的可行性。

The agricultural irrigation in Xiaguanylng Village, Yuzhong County, Gansu Province-a state poverty-stricken county are selected as the research object. This paper analyzes and compares the irrigation water composition, soil physicochemical property, corn growth and yield in the sewage irrigated area and well water irrigated area by field experiment, and then analyzes the feasibility of domestic sewage irriga- tion in Yuzhong County. As indicated by the results, the level of NH3-N, COD and TP in the domestic sewage is much higher than that in the well water. Secondly, the content of AN and OM has an average increase of 106.4% and 6.4% respectively and the content of soil nutrient is also increased totally, whereas the content of AP decreases by 7.9% in a long-term sewage irrigation situation. Thirdly, the soil environ- ment is improved effectively without salinization as a result of the small soil bulk density, high moisture content and low salinity below 0.1 g/kg in the sewage irrigation field. Fourthly, the corn growth irrigated with sewage is superior to that irrigated with well water. The dry weight of corn is 7.4% higher in the sewage irrigation field compared to that in the well water irrigation field, the corn yield is raised availably. Therefore, sanitary sewage irrigation has certain feasibility in arid region.