摘要
未经消化的二级生活污水处理厂脱水污泥含氮4.12%,其中有机态氮占93%。土柱试验用差值法测算污泥氮去向为:回收率46%,残留率47%,亏缺率7%。连续5茬的田间小区试验中,2/3化肥氮用污泥氮替代,水稻和小麦可得到相同的籽粒产量和肥料回收率。
Undigested dewatered domestic sewage sludge from secondary treatment plant contained N 4.12%, of which organic form of N accounted for 93%. The percentage of uptake, residual and deficit of sludge-N calculated by difference method in the soil column experiment were 46%, 47%, and 7%, respectively, while those from urea were 59%, 3%, and 38%, respectively. In field experiments with rice and wheat rotation grain yields, N recovery was similar when two thirds of total fertilizer N was replaced by sludge born N.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1996年第2期40-44,共5页
Journal of Nanjing Agricultural University
基金
国家"七五"科技攻关项目
关键词
污泥
氮肥
肥效
sludge utilization
nitrogenous fertilizer
fertilizer efficiency
