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class="NyNewsdetail_con"> <p><span style="font-size:13px">膜清洗頻率與預(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。一般膜清洗是遵循“10%法則"—— 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)反滲透系統(tǒng)，譬如，由于預(yù)處理設(shè)備運(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></p><p><span style="font-size:13px"> 反沖洗對(duì)于防止大顆粒對(duì)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(guò)簡(jiǎn)單的反沖洗就能清除掉，還需要有周期洗化學(xué)清洗?；瘜W(xué)清洗除需增加藥劑和人工費(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></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(tái)化學(xué)混合箱和與值相配的<a data-cke-saved- ><strong>計(jì)量泵</strong></a>、混合器、加熱器等?；瘜W(xué)清洗常是根據(jù)運(yùn)行經(jīng)驗(yàn)來(lái)決定（可以根據(jù)每列設(shè)備壓降讀數(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></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(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></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(zhǎng)一些時(shí)間，需要0.25%甲醛浸泡，以防微生物在膜中生長(zhǎng)?；瘜W(xué)藥劑后每周更換一次。</span></p> </div> <div id="dhc2x7dn9l" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-745657/">電滲析的特點(diǎn)及電滲析的除鹽處理過(guò)程</a></li> <li>下一篇：<a href="/szhcy-Article-742589/">EDI模塊維修方法</a></li> </ul> </div> </div>   <div id="dhc2x7dn9l" class="foot_box"> <div id="dhc2x7dn9l" class="foot_t"> <div id="dhc2x7dn9l" class="w1200"> <a href="/">網(wǎng)站首頁(yè)</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動(dòng)態(tài)</a>　|　<a href="/article.html">技術(shù)文章</a>　|　<a href="/honor.html">榮譽(yù)資質(zhì)</a>　|　<a href="/order.html" 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