施用污泥堆肥对滩涂土壤理化性质的影响

Effects of Sludge Compost Application on Soil Physical and Chemical Properties

污泥堆肥中富含有机质营养成分,可改良土壤,同时要防止重金属和病原菌等可能引起的污染。为评价污泥堆肥作为土壤改良基质的可能性,本试验系统进行了上海曲阳水质净化厂污泥堆肥/滩涂土混配土的理化性质分析。研究结果表明,污泥堆肥与滩涂土混配后,土壤pH、电导率、阳离子交换量等理化指标得到改善;营养得到补充,肥力提高明显;混配土中未见病原菌污染问题,污泥堆肥施加比例控制在30%(干重计)以内时,也不存在重金属污染风险,混配土可以满足农用要求。

The municipal sludge compost is a good organic fertilizer for soils, but the contamination of heavy metals and pathogenic bacteria from sludge compost should be prevented. The physical and chemical properties of compound soil, which is mixed by municipal sewage sludge compost from Quyang Wastewater Treatment Works, Shanghai and bottom soils at flood plain, are determined to evaluate the possibility of sludge compost for soil improvement in this study. Results show that chemical and physical properties of soils such as pH, conductibility, cation exchange capacity as well as the nutrition and fertility are improved when mixed with sludge.There are no contamination of pathogenic bacteria and no risk of heavy metal pollution in the compound soil under 30% application （dry weight）, so the compound soft can meet the requirements of farmland application.