老化对污泥改良沙土吸附水中对硝基苯酚性能的影响探讨

以添加不同比例城市污泥并老化2年后的新疆沙土为研究对象,从有机碳含量及对硝基苯酚吸附能力2个方面探讨了污泥改良技术对沙土的影响。结果表明,模拟废水对硝基苯酚在沙土、污泥及污泥改良沙土中的吸附等温线均符合Langmuir和Freundlich等温式;与污泥和沙土单独老化过程(用于计算理论值)相比,混合老化后的改良沙土的性质发生了很大变化,当加入污泥含量为9.1%～50%时,污泥改良沙土中的有机碳含量比理论计算值减少了11.54%～29.02%;对硝基苯酚在混合老化的改良沙土中的饱和吸附量远大于理论计算值,但吸附系数却远小于后者,表明混合老化后表面吸附作用增强,而有机质的分配作用在总吸附作用中的贡献减小。

Influence of Ageing on Sorption of p-Nitrophenol onto Soil Modified by Sludge

The sorption of p-nitrophenol onto sand soils in Xinjiang with or without being modified by sludge was investigated to study the influence of sludge and ageing process on organic contaminant translocation in soil.Results indicated that the sorption isotherms fitted to both Langmuir and Freundlich functions.Compared with individually ageing either sludge or sand soil,the property of aged sludge and sand soil mixture changed a lot.When sludge portion added in sand soils varied in range of 9.1%~ 50%,the organic carbon contents in the sludge modified soils reduced 11.54%- 29.02%relating to stoichiometric values,and the saturating adsorption of p-nitrophenol onto the modified soils increased 1.14%~ 74.14%over the stoichiometric values,whilst its sorption coefficients were far less than that of latter.It revealed that the mixed ageing process strengthened the surface adsorption and reduced the contribution of partitioning of organic matter in the whole sorption.