堆肥过程中腐殖质含量变化及其对重金属分配的影响  

Variation of Humus in Content During Composting and Its Influence on Heavy Metal Distribution

作　　者：葛骁[1] 魏思雨[1] 郭海宁[1] 褚艳春[1] 丁敬[1] 王小治[1] 封克[1] 

机构地区：[1]扬州大学环境科学与工程学院,江苏扬州225127

出　　处：《生态与农村环境学报》2014年第3期369-373,共5页Journal of Ecology and Rural Environment

基　　金：江苏省普通高校研究生科研创新计划(CXLX13-910);江苏省高等学校大学生创新创业训练计划(201311117025Z);扬州市-校合作项目(YZ2011146)

摘　　要：以H2O和Na4P2O7+NaOH连续浸提污泥堆肥过程中堆体的腐殖酸以及与其结合的重金属,分析腐殖酸及重金属含量随时间的变化规律。结果表明,堆肥过程中重金属主要以胡敏酸(HA)结合态为主,水溶态重金属含量较少,且重金属有效性与迁移性较低;堆肥结束时各水溶态重金属含量减少,HA-Pb、HA-Ni和HA-Cu含量占重金属总量的比例明显升高,与堆肥初始相比分别增加28.00、17.34和1.40百分点,堆肥促进了水溶态重金属向HA结合态转变;HA对几种重金属的固定能力由大到小依次为Cu、Pb、Ni和Zn。Humic acid（HA） and HA-bound heavy in the sludge under composting were extracted using a sequential extraction method with H2O and Na4P2O7＋NaOH, separately,for temporal variation of HA and HA-bound heavy metals. Results show that heavy metals in the sludge under composting were mainly in HA-bound form and a little in water soluble form. Besides, they were quite low in availability and mobility. At the end of composting, water-soluble （FA-bound） forms of heavy metals were low in content, while HA-Pb, HA-Ni and HA-Cu was apparently quite high in proportion to the total heavy metals and increased by 28.00%, 17.34%, and 1.40 percentage points, respectively, over that at the beginning of composting. Obviously, composting promotes transformation of water soluble form into HA-bound form of heavy metals, and HA capacity of binding heavy metals varies, displaying an order of Cu 〉 Pb 〉 Ni 〉 Zn.

关 键 词：污泥堆肥 腐殖酸 重金属 有效性 

分 类 号：X705[环境科学与工程—环境工程]