发明授权
- 专利标题: Chemical waste water treatment method
- 专利标题(中): 化学废水处理方法
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申请号: US703549申请日: 1976-07-08
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公开(公告)号: US4049545A公开(公告)日: 1977-09-20
- 发明人: Peter J. Horvath
- 申请人: Peter J. Horvath
- 申请人地址: OR Salem
- 专利权人: Carvalho; Rocky
- 当前专利权人: Carvalho; Rocky
- 当前专利权人地址: OR Salem
- 主分类号: C02F1/52
- IPC分类号: C02F1/52 ; C02F1/66 ; C02F1/72 ; C02F1/78 ; C02F3/12 ; C02F9/00 ; C02B1/20
摘要:
A method of treating domestic, commercial or industrial waste water which includes the steps of mixing the waste water with a coagulant aid so as to bring the pH of the mixture to within a range of about 9.0-10.5, and thereafter adding precipitating agents in at least two successive steps so as to lower the pH of the mixture by about one unit for each step and thereby precipitate solids therefrom until the mixture is approximately neutral. After the addition of each precipitating agent, the precipitated solids are separated from the waste water effluent before the next succeeding precipitating agent is added. Preferably two such successive precipitation steps are performed, after which the resultant waste water effluent is treated with an oxidizing and disinfecting agent, filtered, and then treated with a further oxidizing and disinfecting agent to minimize the B.O.D. level. In the course of the process, a portion of the solids separated from the waste water effluent in the respective steps is preferably recycled into the treatment system by mixing it with new incoming waste water to partially take the place of the original coagulant aid. The preferred coagulant aid utilized is portland cement, with aluminum sulfate and copper sulfate preferably being used in sequence as the precipitating agents and potassium permanganate and ozone being used in sequence as the oxidizing and disinfecting agents.
公开/授权文献
- US5699834A Manifold-type solenoid valves 公开/授权日:1997-12-23