河道淤泥用作绿化结构土的可行性探讨

针对河道清淤产生大量淤泥面临处理处置的难题,根据绿化结构土用土的技术要求,分析上海国际旅游度假区内5条典型河道淤泥用作结构土的可行性。结果显示,除航城路个别样点的盐分含量和钠吸附比超标外,其余河道淤泥的pH、盐分、阳离子交换量、质地、有机质、主要养分、可溶性硼、重金属和多氯联苯含量均满足绿化种植土壤相关标准要求;而且大部分淤泥的基本理化指标、主要养分含量和重金属清洁度优于上海园林绿化土壤。用淤泥替代园林绿化土壤生产绿化结构土,既可缓解上海土壤资源紧缺,也为淤泥资源化利用开辟新途径。

Exploring the applicability of the river silts as greening structural soils

Towards the problem of disposing large amount of silts produced by silting rivers,according to the technical requirements of soils using in greening structural soils,the feasibility of the silts sampled from five rivers in the Shanghai International Tourist Resort used as the structural soils were analyzed.The results showed that,except the salt content and sodium adsorption ratio in some samples from the Hangcheng road exceeded the standards,the pH value,salt content,cation exchange content,texture,organic matter,primary nutrient,soluble boron,heavy mental and polychlorinated biphenyl could meet the standard requirements for greening.The basic physicochemical index,primary nutrients and the cleanliness of heavy metals of some river silts were better than those of the landscaping soils in Shanghai.Therefore,the silts could be used as raw materials for greening structural soils instead of the landscaping soils.It may not only alleviate the shortage of soil resources in Shanghai,but also find a new approach for the resource utilization of silts.