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</p> 　　聚丙烯酰胺絮凝劑在廢水處理中的絮凝效果是因為它的兩個特點：長鏈（線）狀的分子結構和聚丙烯酰胺分子中含有許多活性基團。聚丙烯酰胺是直鏈狀聚合物，因每個分子是由十萬個以上的單體聚合構成，分子鏈適當長。它假如徹底伸直，其長度要比一般的分子（如蔗糖）或離子（如ca2+）長數萬倍以上。因為它的分子長而細，會曲折或彎曲成不規則的曲線形狀。這個長分子鏈向外側伸出許多化學活性基團：酰胺基-conh2及羧基-cooˉ。<br /> <p> 　　酰胺基對錯離子性基團，但亦善于構成副價鍵而與其它物質的活性基團吸附并連結起來。因為聚丙烯酰胺分子長而細并有許多化學活性基團，它們能和沉淀微粒發生許多銜接而構成較大的絮凝物，這些絮凝物的結構就象棉絮那樣，松懈、無定形，相互連結但不很穩固，內部有許多空間和許多微細的網絡，包藏著許多液體，因此絮凝物的比重頗挨近它所存在的液體本身。絮凝物中還網絡了各種各樣的微粒，這就將各種不同成分、不同性質、不同巨細的微粒調集在一起。因此，杰出的絮凝劑處理能將溶液華夏有的微粒徹底網絡除去，使溶液顯得特別清亮通明和有光澤。因為絮凝物的尺寸較大，它的沉降和過濾都比較快。 </p> <p style="text-align:center;"> <img src="/Upload/5fc5ba01e37a0.jpg" width="500" height="345" alt="" /> </p> 　　針對聚丙烯酰胺的投加量，泰航清水公司建議，依據實際狀況挑選，因為每個廠的狀況不同，不能一概而論。對于生物除磷效果功能較弱的污水廠，出水規范進步而又沒有進行生物除磷的改造時，只能依賴化學除磷強化對磷的去除，這種狀況下絮凝劑投量就較高，尤其是對出水要求較高的污水廠。當出水TP要求低于1mg/L時，隨著TP指標要求的進步，絮凝劑投加量呈指數增加，而不是線性增加較快。<br /></div> <div class="page" style="clear:both;"> 上一條：<a href="http://www.techgiant-art.com/news/gsxw/show341.html">聚丙烯酰胺不同型號價格及用途之間的差別</a><br> 下一條：<a 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