摘要
笔者以城市污水处理厂污泥为研究对象,添加不同种类及不同比例的调理剂对A、B和C堆污泥进行高温堆肥试验,分析了堆肥成品的种子发芽指数和基本理化性质,用顺序提取法分析堆肥、种植小白菜前后重金属形态的变化,为城市污水厂污泥资源化利用及堆肥中重金属形态变化提供相关参考。结果表明,城市污水厂污泥经过堆肥处理,添加剂种类及添加比例对污泥的腐熟程度有一定影响,且堆料中重金属Cu、Zn的X-(KNO3+H2O)态均有所降低,其中Cu的X-(KNO3+H2O)态下降比例顺序是C堆(53.71%)>A堆(24.64%)>B堆(2.55%),Zn的X-(KNO3+H2O)态下降比例是A堆(80.58%)>B堆(71.09%)>C堆(66.34%);堆肥处理后的土壤中,Cu、Zn的X-(KNO3+H2O)态的比例则有所增加。试验结果对污水厂污泥堆肥土地利用及重金属形态在土壤中的形态转化具有实用价值。
In order to offer reference for the resource utilization of sludge and the form change of heavy metal in composting, sludge from municipal sewage plant was used as study material, thermophilic composting tests were conducted on compost A, B and C with conditioner of different types and proportions, the germination index and basic physical and chemical properties of composting product were analyzed, the change of heavy metal forms in compost and soil after the cultivation of cabbage were analyzed by the method of sequential extraction. The results showed that after compost, different types and ratios of conditioner had certain impacts on the degree of maturity, and the X-（KNO3＋H20） form of Cu and Zn declined, the decline proportion order of X-（KNO3＋H20） form of Cu was compost C （53.71%） 〉 compost A （24.64%） 〉 compost B （2.55%） and the order of Zn was compost A （80.58%） 〉 compost B （71.09%）〉 compost C （66.34%）. The content of X-（KNO3＋ H20） form Cu and Zn both increased in the soil after the application of compost. The test results had practical values in the use of compost and the form change of heavy metal in soil.
出处
《中国农学通报》
2015年第23期116-121,共6页
Chinese Agricultural Science Bulletin
基金
陕西省教育厅产业化项目"生物营养物处理工艺剩余污泥营养素回收和处理技术集成中试"(2013JC20)
关键词
城市污泥
高温堆肥
重金属形态
种子发芽指数
municipal sludge
thermophilic eomposting
heavy metal form
germination index
