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由于預(yù)處理系統(tǒng)中存在多個(gè)工藝，其優(yōu)化設(shè)計(jì)的首要問題是各工藝的內(nèi)部參數(shù)優(yōu)化。以超濾膜通量為例，設(shè)計(jì)通量高則元件數(shù)量少、設(shè)備投資少，但負(fù)荷重、清洗與衰減周期短、換膜成本高。以軟化設(shè)備的控制方式為例，定運(yùn)行時(shí)間再生方式的設(shè)備成本低，但再生周期的裕度大、再生鹽耗與水耗高;定生產(chǎn)水流量再生方式的設(shè)備成本高，但再生周期的裕度小、再生鹽耗與水耗小。針對(duì)不同的原水濁度及原水硬度，存在不同的超濾通量與軟化器再生方式。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 預(yù)處理系統(tǒng)優(yōu)化設(shè)計(jì)的另一個(gè)突出問題是各分工藝的配合。以超濾工藝前處理為例，當(dāng)原水濁度較低時(shí)，不用附加超濾前處理;當(dāng)原水濁度較高時(shí)，則應(yīng)采用盤濾器或纖維過濾器作為超濾前處理;當(dāng)原水COD</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">（</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">COD</span></span></strong><strong><span style="font-size:10.5pt"><span style="font-family:宋體">自動(dòng)在線監(jiān)測(cè)儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">)</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">較高時(shí)，甚至還應(yīng)附加曝氣生物濾池(BAF)作為超濾前處理。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 預(yù)處理系統(tǒng)中除鐵、除錳、除氯的工藝形式簡(jiǎn)單、處理*，易于達(dá)到工藝目的，適合的工藝及參數(shù)設(shè)計(jì)即可滿足膜系統(tǒng)要求。對(duì)于以除有機(jī)物為目的的過濾工藝和以防止難溶鹽結(jié)垢為目的的阻垢工藝而言，不同的工藝形式會(huì)產(chǎn)生不同的處理效果，而過</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">濾</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">及阻垢工藝的處理效果直接影響</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">著膜</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">系統(tǒng)的設(shè)計(jì)水平與運(yùn)行效果。因此，預(yù)處理產(chǎn)水中表征過</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">濾</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">工藝效果的污</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">染</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">指數(shù)(即SD</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">I</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">)及難溶鹽飽和度等水質(zhì)指標(biāo)，成為聯(lián)結(jié)預(yù)處理及膜系統(tǒng)前后兩系統(tǒng)設(shè)計(jì)的重要紐帶。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 預(yù)處理系統(tǒng)產(chǎn)水的污染指數(shù)越低，對(duì)預(yù)處理工藝水平的要求越高，預(yù)處理系統(tǒng)的投資與運(yùn)行成本也越高;而污染指數(shù)越低，對(duì)膜系統(tǒng)的污染越輕，膜系統(tǒng)投資與運(yùn)行成本就越低。如何平衡這兩個(gè)設(shè)計(jì)成本即成為</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">反滲透系統(tǒng)</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">設(shè)計(jì)中的典型問題之一。</span></span></p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2325743/">活性污泥微生物凈化反應(yīng)過程</a></li> <li>下一篇：<a href="/szhcy-Article-2317589/">溶解氧對(duì)亞硝化率的影響</a></li> </ul> </div> </div>   <div id="35hf15jpnp" 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