生物质炭输入对污泥施用土壤-植物系统中多环芳烃迁移的影响  

Effect of Bio-charcoal on the Trans of Polycyclic Aromatic Hydrocarbons in Soil-Plant System with Composted Sludge Application

作　　者：花莉[1,2] 陈英旭[2] 吴伟祥[2] 马宏瑞[1] 

机构地区：[1]陕西科技大学资源与环境学院,西安710021 [2]浙江大学环境与资源学院,杭州310029

出　　处：《环境科学》2009年第8期2419-2424,共6页Environmental Science

基　　金：国家自然科学基金项目(40432004);陕西省自然科学基金项目(2007E114);陕西科技大学科研启动基金项目(BJ09-10)

摘　　要：利用温室盆栽黑麦草实验,研究了生物质炭输入对污泥施用土壤性质、植物生长及土壤-植物系统中多环芳烃迁移性能的影响.结果表明,施用含炭堆肥污泥更有利于改善土壤的缓冲性能及增加土壤养分含量,与普通堆肥污泥处理相比,施用含炭堆肥污泥的黄棕壤和红壤中阳离子交换量分别提高了10%和5%,而2种土壤总氮含量则分别提高了13%和18%.同时,生物质炭的输入更有利于促进植物生长,与普通堆肥污泥处理相比,2种土壤中含生物质炭堆肥污泥处理黑麦草生物量均提高了23%,黄棕壤和红壤中种植的黑麦草叶绿素含量分别增加了8%和10%.生物质炭的输入还使得污泥-土壤体系中的多环芳烃转移到植株中的量明显减少,含炭堆肥污泥处理中多环芳烃在黑麦草中的累积量比普通污泥相应处理降低了27%-34%.因此,生物质炭作为污泥堆肥调理剂,不仅能进一步改良土壤性质,促进植物生长,还可以有效限制污泥-土壤体系中多环芳烃在环境中的迁移,降低潜在的污染风险.The effects of bio-charcoal acted as sludge-composting additive on soil characteristics and plant growth were studied. Compared with the treatment of composted sludge without bio-charcoal, soil cation exchange capacity in treatment of composted sludge with bio-charcoal increased over 5 % and 10% respectively and soil nitrogen content increased 13 % and 18 % respectively for two kind soils. The composted sludge with bio-charcoal also resuhed in 23% higher enhancement on ryegrass biomass and 8%-10% higher enhancement on ryegrass chlorophyll content. In addition, with the amendment of bio-charcoal, the bioavailability of polycyclic aromatic hydrocarbons （PAHs） in composted sludge was decreased, which resulted in the lower absorption and accumulation of ryegrass to PAHs. Compared with the control, the PAHs concentration in ryegrass amended composted sludge with bio-charcoal decreased 27%-34%. The results indicated that composted sludge with bio-charcoal resulted in much more improvement on the plant growth as well as less negative effect on environment. Therefore, biocharcoal was in favor of the safe land application of sewage sludge.

关 键 词：生物质炭 污泥 黑麦草 多环芳烃 

分 类 号：X171.5[环境科学与工程—环境科学]