摘要
城市污水处理厂产生的大量剩余污泥需要妥善处理,否则既占用了大量土地,又会造成二次污染。中国目前有很多因矿产开发而废弃的重金属含量高、缺乏腐殖质的土地。研究将模拟的矿区土壤与富含氮、磷等营养物质的剩余污泥进行不同比例的混合,并在上面栽种2种不同的植物鱼腥草(Houttuynia cordata Thunb)和印度芥菜(Brassicajuncea)。研究结果表明,当土壤中铅含量高达2 785 mg/kg时,鱼腥草完全不能生长,印度芥菜比鱼腥草对铅的耐受能力更强,更适合严重铅污染土地的修复。适当的污泥投加量是影响该技术推广的关键,而当选取不同的植物来修复土壤时,剩余污泥投加比例应根据实验来确定。
The excess sludge produced by wastewater treatment plant with biological technology should be handled properly,or it could occupy a lot of land, and cause secondary pollution. Due to mineral development, China currently has a high number of abandoned land which has high heavy metal content and low land humus. This topic mixed simulative mine and excess sludge with rich soil nitrogen, phosphorus and other nutrients in different proportions. Then two different plants were cultured-Houttuynia cordata Thunb and Brassicajuncea The results shows that when the soil lead content of up to 2 785 mg/kg,the Houttuynia cordata can not grow, Brassicajuncea has a stronger tolerance than Houttuynia cordata and more suitable for repair serious lead contamination of land. Appropriate sludge dosage is key to the promotion of the impact of technology.When applying to different plants in soil, sludge dosing ratio should be determined according to the experiment.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第S1期281-284,共5页
Environmental Science & Technology
基金
2013年度四川大学"大学生创新创业训练计划"(20130464)
