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<strong>反滲透膜清洗</strong>頻率與預(yù)處理措施的完善程度是緊密相關(guān)的。預(yù)處理越完善，清洗間隔越長(zhǎng);反之，預(yù)處理越簡(jiǎn)單，清洗頻率越高一般</span></span><strong><span style="font-size:14px"><span style="font-family:宋體">美國(guó)陶氏反滲透膜</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">清洗是遵循“10%法則”一一當(dāng)校正過(guò)的淡水流量與初200h 運(yùn)行(壓緊發(fā)生之后)的流量相比，降低了10 %和(或)觀見(jiàn)察到壓差上升了10%-20%就需進(jìn)行清洗。盡可能在脫鹽率下降顯示出來(lái)以前采取措施。正規(guī)安排的保護(hù)性維護(hù)清洗不足以保護(hù)<strong>反滲透系統(tǒng)</strong>，譬如，由于預(yù)<strong>廢水處理EDI設(shè)備</strong>運(yùn)行不正常，進(jìn)水條件在短時(shí)間內(nèi)就會(huì)發(fā)生變化。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 反沖洗對(duì)于防止大顆粒對(duì)某此型式反滲透膜件的堵塞是有效的，但不是所有的污染都可通過(guò)簡(jiǎn)單的反沖洗就能清除掉，還需要有周期的化學(xué)清洗?；瘜W(xué)清洗除需增加<strong>阻垢藥劑</strong>和人工費(fèi)用外，還有污染問(wèn)題，所以也不可過(guò)于頻繁，每月不應(yīng)超過(guò)1-2次，每次清洗時(shí)間約1-2h。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 化學(xué)清洗<strong>污水處理系統(tǒng)</strong>通常包括一臺(tái)化學(xué)混合箱和與之相配的泵、混合器、加熱器等。化學(xué)清洗是根據(jù)運(yùn)行經(jīng)驗(yàn)來(lái)決定（可以根據(jù)每列設(shè)各壓終詩(shī)數(shù)與運(yùn)行時(shí)間的關(guān)系曲,線，或是依據(jù)產(chǎn)水量、淡水水質(zhì)和膜的壓降等）。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 化學(xué)清洗所用的藥劑和方法，需根據(jù)污染源來(lái)決定。下表可供參考，但更應(yīng)重視積累和應(yīng)用本單位的經(jīng)驗(yàn)。為了保證效果，在化學(xué)清洗前要進(jìn)行沖洗。沖洗前先降壓，再用2-3倍正常流速的進(jìn)水沖洗膜，靠流體的攪動(dòng)作用將污物從膜面剝離并沖走。然后針對(duì)污染特征，選擇清洗液對(duì)膜進(jìn)行化學(xué)清洗。為了保護(hù)反滲透膜件，液溫不超過(guò)35</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">’</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">C 。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 系統(tǒng)若停用5天以上 ,用甲醛沖洗后再投用。如果系統(tǒng)停用兩周或更長(zhǎng)一些時(shí)間，需用0. 2 5%甲醛浸泡以防微生物在膜中生長(zhǎng)?；瘜W(xué)藥劑每周更換一次。</span></span></p><p style="text-align:center"><span style="font-size:10.5000pt"><span 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