摘要
将城市污泥与树皮、秸秆、醋糠堆肥，当污泥与富碳材料的混合体C／N〈15时，在堆肥过程中存在氮素损失，混合体的C／N在15～37．1之间，全氮含量高于堆肥初期；树皮、秸秆和醋糠对污泥中的重金属有稀释作用，当污泥中镉含量高达64．253mg／kg时加入3倍的树皮，堆制后可使镉浓度降到国家污泥农用安全标准限值内，实现污泥的无害化处理；各堆肥处理均能顺利升温并在50℃～55℃维持5d以上，可杀灭致病菌，达到卫生化要求。
The content of heavy metals, pathogenic microorganisms and nutrition of precomposted and composted municipal waste water sludge with carbon - rich materials of bark,straw and vinegar dregs were studied. The results showed that carbon - rich materials had positive effects on reducing the risk of heavy metals in sewage sludge. After a period of compost with 3 times of bark the concentration of heavy metal of sludge with 64.253 mg/kg Cd was decreased to a safe level for land use. The temperature of all treatments could reach to 50℃- 55℃ for more than 5 days and all pathogenic microorganisms would be killed in this environment. This study also found that the C/N index with 15 to 37 would improve the nitrogen effectiveness in compost.
出处
《河北林果研究》
2008年第3期271-275,共5页
Hebei Journal of Forestry and Orchard Research
基金
石家庄市科技局国际合作计划"城市污泥无害化处理及应用技术研究(05924066A)"
国家林业局项目"城市污泥在林业生态修复工程中的应用技术示范推广(Y20006032700)"
关键词
城市污泥
堆肥
C/N
重金属
municipal waste water sludge
compost
C/N
heavy metal
