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255);">顆粒以及溶質大分子由于與膜存在物理、化學或機械作用而引起的在膜表面或膜孔內吸附和沉積造成膜孔徑變小或堵塞，使膜通量及膜的分離特性產生變化的現象。組分在膜孔中沉積將造成膜孔的減小乃至堵塞。對膜污染而言，往往具有不可逆性。而濃差極化則是膜表面局部濃度增加引起邊界層流體阻力增加，導致傳質推動力下降的現象。這種影響具有可逆性，可通過降低料液濃度或改善膜面附近料液側的流體力學條件如提高流速、采用湍流促進器和設計合理的流道結構等方法來減小濃差極化的影響。對膜孔徑的選擇，不能簡單認為在能夠滿足截留效果的前提下應盡量選擇較大孔徑的膜，應根據所處理物料的特點及所要達到的截留率來確定。對較大孔徑的膜，盡管其初始通量較大，但通量衰減較快，易受到膜污染。因此對膜孔徑的選擇應比要求截留的分子質量要小，這樣能獲得較好的處理效果，還可減少溶質在膜孔上的吸附和堵塞所造成的污染。因此實際操作過程中還要綜合考慮兩者的關系，通過實驗來確定合適的膜孔徑。</span></p> </div> <div class="get-back"> <a href="javascript:history.go(-1)">返回列表 > </a> </div> </div>    <div class="index-advisory" style="background:url(images/f.jpg) center center no-repeat;background-size:cover;"> <div class="boxs"> <div class="box"> <div class="tbox"> <div class="title">想看產品</div> <div class="txt">產品中心，瀏覽產品各大類目</div> </div> <a href="javascript:;" class="link">查看更多 >>>></a> </div> <div class="box"> <div class="tbox"> <div class="title">發送短信</div> <div class="txt">如果你有購買需求，請聯系我們</div> </div> <a href="javascript:;" class="link">從這里咨詢 >>>></a> </div> 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