摘要
传统污水好氧生物处理过程中产生大量剩余污泥,这些污泥有机质中富含大量的氮磷元素。随着剩余污泥的消化并最终处置,大量的氮磷资源被白白浪费。在污泥消化过程中有机态氮磷可以在水解类细菌的水解作用下最终以氨氮和磷酸盐的形式溶出。当水解液中氨氮和磷酸盐达到一定浓度时,投加镁盐并调节pH,生成鸟粪石沉淀。鸟粪石作为一种缓释肥具有良好的经济效益。从资源回收的角度看,对剩余污泥水解酸化阶段研究有利于实现剩余污泥中氮磷资源的有效回收。
Process of sewage aerobic biological treatment produced a large amount of wasted sludge, such excess activated sludge rich in a large number of elements of nitrogen and phosphorus. With digestion and final disposal of excess sludge, lots of nitrogen and phosphorous resource is wasted. Hydrolysis of excess activated sludge by hydrolyzed bacteria can yield soluble ammo- nia and phosphate. When the ammonia and phosphate in hydrolysate reached a certain concentration, adding magnesate and adjusting the pH resulted struvite. Struvite as a kind of slow release fertilizer had good economic returns. In the views of resource recovery, study of hydrolysis and acidification of excess activated sludge conduces to realization of recovery of nitrogen and phosphorus resources.
出处
《环境科学与管理》
CAS
2008年第8期118-120,共3页
Environmental Science and Management
关键词
污泥水解
氮磷回收
鸟粪石
sludge hydrolysis
nitrogen and phosphonls recovery
stmvite
