21-06-2018 дата публикации
Номер: US20180170769A1
Принадлежит:
An apparatus and method for treatment of waste water, comprising a tank for receiving a waste water influent via an influent pump and discharging a treated waste water effluent via an effluent pump; a screen decanter disposed in the tank, the screen having a pore size of about 50 micrometers; and a timer operationally connected to the floating decanter and the effluent pump. Solids are settled from the waste water and drawn off through the tank bottom after a supernatant fluid is drawn off through the floating screen decanter. The supernatant fluid may be passed through a filtration and membrane water purification apparatus to generate purified water. 1. A method for treating an effluent stream of waste water , comprising the steps of:a) providing a tank for receiving and treating said effluent stream, said tank having a side wall;b) pumping said influent stream into said tank such that said influent stream entering said tank flows in a direction substantially parallel to said tank wall to cause circumfrential circulation of influent within the tank;c) receiving a volume of said waste water in said tank;d) stopping said receiving and allowing said received volume of waste water to stand in said tank without agitation for a predetermined period of time to allow gravitational settling and separation of suspended solids in said waste water into a settled solids fraction and a supernatant fraction;e) drawing off said supernatant fraction after said predetermined period of time through a decanter selected from the group consisting of screen decanter and non-screen decanter, wherein said decanter is disposed within said tank and is operable to follow dynamically in a vertical direction changes in the level of said waste water as said drawing off of said supernatant fraction is carried out, andf) drawing off said settled solids fraction from a lower surface of said settled solids fraction; andg) passing said supernatant fraction through a filtration and membrane water ...
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