外加碳源对污水灌溉系统氮素去除和作物生长影响的实验研究

Impact of Increased Wastewater Organic Carbon Content on Nitrogen Removal and Crop Growth in a Trial Wastewater Irrigation System

基于土柱实验,对有作物生长条件下的污水灌溉土地处理慢渗系统氮素去除和作物生长状况开展实验研究,探讨在灌溉原污水中添加有机碳对该系统去除氮素和作物生长状况产生的影响作用。实验研究结果表明,随着灌溉原污水中有机碳含量的逐渐增加,污水灌溉土地处理慢渗系统下排的水量有所增大,排水中的氮素(铵态氮、硝态氮、总氮)淋溶量和化学需氧量有所增加,而作物的干物质量和吸氮量则明显下降;增加灌溉原污水中的有机碳含量,会影响污水灌溉土地处理慢渗系统去除氮素的效果和作物生长条件,在增加基于硝化和反硝化作用的除氮量同时,造成作物生长水土环境的改变,导致作物产量显著下降。

Nitrogen removal and crop growth in a trial soil column wastewater irrigation system are observed, and the impact of increased wastewater organic carbon content on them are tested. It is shown that with the increase of wastewater organic carbon content, the volume of drainage, the amount of leached nitrogen （ammonium, ni- trate and total nitrogen） and COD will increase, while the dry matter yield of the crop and the amount of nitrogen uptaken by the crop will decrease. The changed soil circumstance resulted from increased wastewater organic carbon content has a negative impact on crop growth.