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1. 发明授权

US06585895B2 Wastewater treatment process 有权
公开(公告)号：US06585895B2
公开(公告)日：2003-07-01
申请号：US09767478
申请日：2001-01-23
申请人： Stephen A. Smith , Howard E. C. Brown
发明人： Stephen A. Smith , Howard E. C. Brown
IPC分类号： C02F312
CPC分类号： C02F3/1221 , C02F1/66 , C02F3/342 , Y02W10/15
摘要： There is provided a process for treating industrial wastewater that substantially eliminates the generation of excess solids in the system requiring mechanical removal. The wastewater undergoes an equalization step wherein hydraulic flow is smoothed and the pH of the wastewater is adjusted to near neutral pH conditions. The equalized wastewater is then transferred to aeration tanks where the organic process wastes are absorbed, metabolized, or otherwise biodegraded by the microorganisms in the mixed liquor in the aeration tanks. After the aeration step, the wastewater is separated by gravity in a clarifying step to separate the wastewater into a liquid phase and a semi-solid phase. The clarified liquid phase is withdrawn from the clarifier and discharged, while the semi-solid phase is transferred either directly back to the aeration/biological treatment step, as recycle-activated sludge, or into a bioreactor as waste-activated sludge. In the bioreactor the semi-solid phase is subjected to active aeration. The aerated waste-activated sludge is then batch-recycled to the equalization tank discharging to the aeration step where it is mixed into newly introduced untreated wastewater and undergoes a new cycle of biological treatment. As a result of the indirect batch-recycling of bioreactor waste-activated sludge into the mixed liquor (biomass containing waste sludge) under aeration, which is also receiving recycle-activated sludge and enzymes, the excess solids generated in this process virtually eliminated.

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