污泥改良对新疆低有机质土壤吸附水中对硝基苯酚性能的影响

Influence of Sludge Improvement on Sorption of p-nitrophenol on Low Soil Organic Matter

[目的]以施加不同比例城市污泥并老化2年后的新疆低有机质土壤为研究对象,探讨污泥改良对土壤性质及其对对硝基苯酚吸附能力的影响。[方法]采用绘制等吸附曲线的试验方法。[结果]水中对硝基苯酚在原土、污泥及污泥改良土壤中的吸附等温线均符合Langmuir和Freundlich等温式;当加入污泥含量为9.1%～50.0%时,污泥改良土壤中的有机碳含量比理论计算值减少66.3%～24.8%;对硝基苯酚在混合老化的改良土壤上的实测饱和表面吸附量远大于理论计算值,但吸附系数远小于后者。[结论]混合老化后改良土壤的性质发生很大变化,混合老化后表面吸附作用增大,而有机质的分配作用在总吸附作用中的贡献减小。

[Objective] The sorption of p-nitrophenol on soils in Xinjiang with or without sludge amended was investigated to study the influence of sludge and ageing process on organic contaminant translocation in soil.[Method] The adsorption curve was drawn in this experiment.[Result] The sorption isotherms fit to both Langmuir and Freundlich function.When sludge content in amend soils changed from 9.1% to 50.0%,compared with the soil properties in single ageing process,the organic content of soils in mixed aging process of sludge and soil reduced 66.3%~24.8%.The saturation adsorption value of p-nitrophenol on soils with sludge amended increased,while as the sorption coefficients on soils amended with sludge decreased.[Conclusion] The mixed ageing process increased the adsorption mechanism contribution in total sorption,while decreased partition mechanism contribution in total sorption.