Wastewater treatment system

专利名称：Wastewater treatment system

发明人：Bruce R. Johnson,Glen T. Daigger,George V.

Crawford

申请号：US118410申请日：20070928公开号：US07435340B2公开日：20081014

专利附图：

摘要：This disclosure describes wastewater treatment systems and methods oftreating wastewater. In one exemplary method, a wastewater is split into first and secondwastewater fractions. The first fraction is delivered to a membrane bioreactor, which may

produce an effluent with a low pollutant concentration, and the second fraction isdelivered to a biological wastewater treatment system, which may yield a higherpollution concentration yet have a shorter solids retention time. Some implementationsof the invention can routinely meet or even exceed pollution discharge standards quiteeconomically during normal operation, yet retain significant flexibility for handlingseasonal or sudden variations in the flow rate of wastewater into the system. In selectadaptations, waste activated sludge containing heterotrophs, autotrophs, and(optionally) polyphosphate accumulating organisms is delivered from the membranebioreactor to the biological wastewater treatment system.

申请人：Bruce R. Johnson,Glen T. Daigger,George V. Crawford

地址：Boise ID US,Englewood CO US,Toronto CA

国籍：US,US,CA

代理机构：Perkins Coie LLP

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