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反滲透設備的清洗方法

時間:2011/11/10閱讀:665
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反滲透技術因具有特殊的*性而得到日益廣泛的應用。反滲透凈水設備的清洗問題可能使許多技術力量不強的用戶遭受損失,,所以要做好反滲透設備的管理,,就可以避免出現(xiàn)嚴重的問題,。
1.低壓沖洗反滲透設備
定期對反滲透設備進行大流量,、低壓力,、低pH值的沖洗有利于剝除附著在膜表面上的污垢,維持膜性能,,或當反滲透設備進水SDI突然升高超過5.5以上時,,應進行低壓沖洗,待SDI值調(diào)至合格后再開機,。
2.反滲透設備停運保護
由于生產(chǎn)的波動,,反滲透設備不可避免地要經(jīng)常停運,,短期或長期停用時必須采取保護措施,,不適當?shù)靥幚頃е履ば阅芟陆登也豢苫謴汀?/div>
短期保存適用于停運15d以下的系統(tǒng),可采用每1~3d低壓沖洗的方法來保護反滲透設備,。實踐發(fā)現(xiàn),,水溫20℃以上時,,反滲透設備中的水存放3d就會發(fā)臭變質(zhì),有大量細菌繁殖,。因此,,建議水溫高于20℃時,每2d或1d低壓沖洗一次,,水溫低于20℃時,,可以每3d低壓沖洗一次,每次沖洗完后需關閉凈水設備反滲透裝置上所有進出口閥門,。
長期停用保護適用于停運15d以上的系統(tǒng),,這時必須用保護液(殺菌劑)充入凈水設備反滲透裝置進行保護。常用殺菌劑配方(復合膜)為甲醛10(質(zhì)量分數(shù)),、異噻唑啉酮20mg/L,、亞硫酸氫鈉1(質(zhì)量分數(shù))。
3.反滲透膜化學清洗
在正常運行條件下,,反滲透膜也可能被無機物垢,、膠體、微生物,、金屬氧化物等污染,,這些物質(zhì)沉積在膜表面上會引起凈水設備反滲透裝置出力下降或脫鹽率下降、壓差升高,,甚至對膜造成不可恢復的損傷,,因此,為了恢復良好的透水和除鹽性能,,需要對膜進行化學清洗,。
一般3~12個月清洗一次,如果每個月不得不清洗一次,,這說明應該改善的預處理系統(tǒng),,調(diào)整的運行參數(shù)。如果1~3個月需要清洗一次,,則需要提高設備的運行水平,,是否需要改進預處理系統(tǒng)較難判斷。

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