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style="font-size:13px"> 反沖洗對于防止大顆粒對某些型式反滲透膜件的堵塞是有效的。但不是所有的污染都可能通過簡單的反沖洗就能清除掉，還需要有周期洗化學(xué)清洗。化學(xué)清洗除需增加藥劑和人工費用外，還有污染問題，所以也不可過于頻繁，每月不應(yīng)超過1～2次，每次清洗時間約1～2h。</span></p><p><span style="font-size:13px"> <span style="color:#000000;"> </span>化學(xué)清洗系統(tǒng)通常包括一臺化學(xué)混合箱和與值相配的<a data-cke-saved- ><strong>計量泵</strong></a>、混合器、加熱器等?；瘜W(xué)清洗常是根據(jù)運行經(jīng)驗來決定（可以根據(jù)每列設(shè)備壓降讀數(shù)與運行時間的關(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></p><p><span style="font-size:13px"> 化學(xué)清洗所用的藥劑和方法，需根據(jù)污染源來決定。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。為了保證效果，在化學(xué)清洗前要進行沖洗。沖洗前先降壓，再用2～3倍正常流速的進水沖洗膜，靠流體的攪動作用將污物從膜面剝離并沖走。然后針對污染特征，選擇清洗液對膜進行化學(xué)清洗。為了保護反滲透膜件，液溫不超過35℃.</span></p><p><span style="font-size:13px"> 系統(tǒng)若停用5天以上，做好用甲醛沖洗后再投用。如果系統(tǒng)停用兩周或更長一些時間，需要0.25%甲醛浸泡，以防微生物在膜中生長?；瘜W(xué)藥劑后每周更換一次。</span></p> </div> <div id="tq6ztn8r" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-745657/">電滲析的特點及電滲析的除鹽處理過程</a></li> <li>下一篇：<a 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