堆肥污泥施用后氮磷流失对水环境影响的研究

Effect of Nitrogen and Phosphorus Loss on Water Environment After Application of Composting Sludge

为探讨堆肥污泥土地利用后,在持续降雨情况下,从堆肥污泥中流失的氮磷对水环境的影响,选取校园林地土壤及北郊污水处理厂的堆肥污泥进行淋溶实验,旨在研究长春地区雨季丰沛期,堆肥污泥林地利用过程中氮磷流失对水环境的影响。结果表明,初次淋洗时土壤淋溶液中氮、磷素的含量,均随堆肥污泥施用量的增加而增加,总氮由对照组的3.055 mg/L升至3.429 mg/L;总磷由对照组的0.251 mg/L升至0.409 mg/L;氨氮由对照组的0.896 mg/L升至1.208 mg/L。另外,当堆肥污泥在林地土壤中的施用量控制在40%以下,月降雨量达到205.5 mm时,土壤淋溶液中氨氮的含量将升高至1.208mg/L,仍符合农业用水的水质标准。

In order to explore the influence of nitrogen and phosphorus lost from composting sludge on water environment after land use under continuous rainfall, the soil of campus forestland and composting sludge from northern suburb sewage treatment plant were selected for leaching experiment, aiming to study the influence of nitrogen and phosphorus loss on water environment during the use of composting sludge forestland in rainy season in Changchun. The results showed that the content of nitrogen and phosphorus in soil leaching solution for the first time increased with the increase of applying composting sludge amount, total nitrogen content increased from 3.055 mg/L in the control group to 3.429 mg/L;Total phosphorus content increased from 0.251 mg/L in the control group to 0.409 mg/L. Ammonia nitrogen content increased from 0.896 mg/L in the control group to 1.208 mg/L. In addition, when the application amount of composting sludge in woodland soil was controlled below 40% and the monthly rainfall reached 205.5 mm, the content of ammonia nitrogen in soil leaching solution rose to 1.208 mg/L, still meeting the water quality standards for agricultural water.