摘要
为探讨交替好氧厌氧堆肥化过程中城市污泥重金属含量和化学形态的变化规律，以城市污泥为主，混以一定量的城市有机垃圾，控制含水率在60％左右、C／N质量比为30～40，进行为期60天的交替好氧厌氧堆肥处理．结果表明：Cu、Ni、Cd、Cr、Pb的含量均有不同程度降低，zn的含量稍有上升，但均低于国家污泥农用标准．重金属的化学形态分布发生了较大变化，其中可交换态Cu、Ni、Cd、Cr和Pb所占比例和含量均出现明显下降．可交换态Zn所占比例下降，含量略微增加．说明交替好氧厌氧堆肥处理降低了城市污泥与城市有机垃圾农用对土壤和水体的重金属污染风险．
In order to investigate the variations of contents and chemical forms of heavy metals in the municipal sewage sludge during the alternative aerobic and anaerobic composting, municipal sewage sludge was mixed with municipal organic garbage to carry out a 60-day alternative aerobic and anaerfbic composting tryout. In the experiment, the moisture content and the C/N ratio were respectively controlled at about 60% and 30 -40. The resuhs indicate that （ 1 ） the contents of Cu, Ni, Cd, Cr and Pb all decrease, while the content of Zn slightly increases; （2） the contents of these metals are all lower than the sewage sludge indices set by the state for agronomic use; （3） the distributions of chemical forms of these heavy metals greatly change after the composting, especially, the proportions and contents of Cu, Ni, Cd, Cr and Pb in changeable form decrease obviously; and （4） the proportion of Zn in changeable form decreases, while the content slightly increases. These results indicate that the alternative aerobic and anaerobic composting can prevent the soil and water from being contaminated by heavy metals when municipal sewage sludge and organic garbage are adopted for in agronomic use.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第12期1-4,共4页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省环保局科技攻关项目(2001-28)
关键词
重金属
城市污泥
堆肥化
heavy metal
municipal sewage sludge
composting
