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再生水技術

2016-03-01 13:57

                 

一、再生水定義

  廢水或雨水經適當處理后,達到一定的水質指標,滿足某種使用要求,可以進行有益使用的水叫再生水。“再生水”的定義有多種解釋,在污水工程方面稱為“再生水”,工廠方面稱為“回用水”,一般以水質作為區分的標志。

二、再生水處理工藝

  由于污水成分的復雜性以及回用的用途不同,再生水處理工藝也千差萬別。污水深度處理的基本單元技術有混凝(化學絮凝)、沉淀(澄清、氣浮)、過濾和消毒等。對水質要求更高時采用的深度處理單元技術有活性炭吸附、臭氧氧化、離子交換、膜分離技術、脫氮除磷技術等。通過對上述單元技術的合理組合,就形成了滿足不同使用要求的再生水處理工藝。


四、再生水應用

 1、污水處理后回用作工業用水。最具有普遍性和代表性的用途是工業冷卻水。例如:北京高碑店污水處理廠的二級處理出水給華能熱廠提供冷卻水的水源,供應量為4萬噸每天。同時該污水處理廠還為三河熱電廠等工業企業供水。

 2、污水處理后回用作生活雜用水。為實現北京2008年“綠色奧運”的承諾,使城市污水回用率達到50%,北京市新建9座中水廠,以加大污水再生水回用,推廣城市中水的使用。

 3、污水處理后回用作農業灌溉。在中國北方城市,城市污水和工業廢水已經成為某些郊區農田(包括菜田、稻田和麥田等)灌溉用水的主要水源之一。

 4、從持續發展的觀點看,再生水應主要應用于地下水回灌。

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