餐厨垃圾与铬污染土壤混合堆肥中铬形态的转化  

Changes of chromium speciation during aerobic co-composting of chromium-contaminated soil and food wastes

作　　者：金春姬[1] 任娟[1] 田国宾[1] 赵振焕[1] 张鹏[1] 

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,青岛266100

出　　处：《环境工程学报》2011年第1期225-230,共6页Chinese Journal of Environmental Engineering

摘　　要：进行了不同比例铬污染土壤与餐厨垃圾混合堆肥实验,分析了堆肥过程铬形态的变化、浸出液毒性以及种子发芽指数。结果表明,堆肥实验后,堆肥物料中可交换态和碳酸盐结合态的铬含量逐渐减少,最多可分别减少82.6%和72.69%,有机结合态的铬含量明显增加,最大增幅为106.58%;堆肥物料浸出液铬的浓度低于国家危险废物鉴别标准,浸出浓度范围为1.05-2.63 mg/L;堆肥后物料毒性降低,对种子发芽抑制作用小。堆肥化过程能够降低铬的毒性和迁移性。Experiments on the aerobic co-composting of chromium-contaminated soil and food wastes were carried out in order to analyze the distribution of chromium speciation and the seed germination index.The results showed that the exchangeable speciation chromium and carbonate bound form chromium concentration maximally decreased by 82.6% and 72.69%,respectively.While organic-bound chromium concentration increased obviously with a maximum range of 106.58%.Chromium leaching concentration in the range of 1.05～2.63 mg/L is lower than the national standards of the chromium leaching for hazardous waste.The inhibition on the seed germination is little after the co-composting.Generally,composting process can reduce the toxicity and mobility of chromium in soil,which indicates a low risk to the environment.

关 键 词：铬污染土壤 餐厨垃圾 好氧堆肥 铬形态 

分 类 号：X705[环境科学与工程—环境工程]