城市污泥堆肥稳定化及其对小白菜生长的影响

Sewage sludge composting and its land utilization on pakchoi growth

以某污水处理厂脱水污泥为研究对象,探讨污泥堆肥稳定化及其土地利用对小白菜生长的影响.结果显示:脱水污泥经高温堆肥处理后,臭味消失,颜色改观,全氮含量为17g/kg,全磷为14.1g/kg,全钾为11.3g/kg,有机质达28.7%.堆肥后的污泥施用比例为2%时就表现出明显的增产效果,小白菜的株高和鲜重分别从空白对照的8.5cm和0.33g增加到15.28cm和2.34g;当堆肥污泥比例进一步增加到12%时,小白菜的株高和鲜重也相应增加到23.35cm和18.39g.

Sewage sludge contains a lot of organic matter,nitrogen,phosphorus,potassium and other plant nutrient elements,thus its agricultural application has become one of the most important ways for sewage sludge recycling.This paper investigated the stabilization of sewage sludge by composting and its land utilization on the growing of pakchoi through pot experiments.Results showed that the sludge could be used as fertilizer after the composting,which had 17g/kg of total nitrogen,14.1g/kg of total phosphorus,11.3 g/kg of total potassium,and 28.7% of organic matter.Appropriate application of sludge compost could promote the growth and yield of pakchoi.When sludge compost was applied with the rates of 0%,1%,2%,3%,6%,9%,and 12%,the plant height and fresh weight of pakchoi increased with the rates.Compared to the control without addition of sludge compost,of which the plant height and fresh weight of pakchoi were 8.5cm and 0.33 g,respectively,the treatment with 2% of sludge compost increased plant height and fresh weight of pakchoi to 15.28 cm and 2.34 g,respectively.The application of 12%of sludge compost resulted in the plant height and fresh weight of pakchoi up to 23.35 cm and 18.39 g,respectively.