公开(公告)号：US09505644B2

公开(公告)日：2016-11-29

申请号：US14291897

申请日：2014-05-30

Applicant: AMERICAN WATER WORKS COMPANY, INC.

Inventor： Eugenio Giraldo ,  Yanjin Liu ,  Swarna Muthukrishnan

IPC: C02F3/30 ,  C02F3/12 ,  C02F3/28 ,  C02F101/10 ,  C02F101/16

CPC classification number: C02F3/308 ,  C02F3/1215 ,  C02F3/1268 ,  C02F3/1273 ,  C02F3/28 ,  C02F3/2846 ,  C02F3/302 ,  C02F3/307 ,  C02F2101/105 ,  C02F2101/16 ,  Y02W10/15 ,  Y10S210/906

Abstract: Methods and systems are provided for treating wastewater to simultaneously remove nitrogen, carbon, and phosphorus. The process includes an anoxic tank that receives at least two streams, including plant influent wastewater and return activated sludge. These streams are mixed in the anoxic tank to promote phosphorus release and fermentation of particulate and dissolved organic matter. The mixed liquor is transferred to an aerated tank having low dissolved oxygen concentrations to promote development of phosphorus-release bacteria that is eventually recycled to the anoxic tank by way of the return activated sludge. Simultaneous nitrification, denitrification, and phosphorus release occur in the aerated tank. A membrane tank separates treated effluent from activated sludge in a membrane tank.

Abstract translation: 提供了处理废水以同时去除氮，碳和磷的方法和系统。 该方法包括一个接收至少两个流的缺氧罐，包括植物进水废水和返回的活性污泥。 这些流在缺氧槽中混合以促进颗粒和溶解的有机物质的磷释放和发酵。 将混合的液体转移到具有低溶解氧浓度的充气罐中，以促进最终通过回流活性污泥再循环至缺氧罐的脱磷细菌的发育。 在充气罐中发生同时硝化，脱氮和磷释放。 一个膜罐将处理过的污水从活性污泥中分离出来。