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title="貴州水處理設(shè)備，純凈水處理設(shè)備" target="_self" style="text-align:center;">貴州水處理設(shè)備，純凈</a></h3></li> </ul> <div id="mzeegll3j66" class="clear"></div> </div> <div id="mzeegll3j66" class="clear"></div> </div> <div id="mzeegll3j66" class="sidebox"> <div id="mzeegll3j66" class="title"> <span>當(dāng)前位置：<a href='/index.php'>首頁</a> >> <a href='/zh-cn-1/fuwu/'>技術(shù)資料</a> >> <a href='/zh-cn-1/fuwu/jishuwenzhai/'>技術(shù)文摘</a> >> 納濾膜在水處理行業(yè)中...</span> <h1>技術(shù)文摘</h1> </div> <div id="mzeegll3j66" class="content"> <div id="mzeegll3j66" class="contain" style="color:#666;"> <div id="mzeegll3j66" class="article" style="text-align:center; color:#666;" > <h2>納濾膜在水處理行業(yè)中的應(yīng)用</h2><div id="mzeegll3j66" class="n_tit"> <span>文章出處：邁科迪環(huán)保</span><span>作者：貴州邁科迪環(huán)保科技有限公司 </span><span>發(fā)表時間：2018-08-14</span><span>閱讀：<font id="hits"></font></span></div> </div> <div id="mzeegll3j66" class="article" id="article" style="color:#666;" > <p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　納濾（NF）膜的研制與應(yīng)用較反滲透膜大約晚20年。20世紀(jì)70年代J˙E˙Cadotte研究NS-300膜，即為研究NF膜的開始。當(dāng)時，以色列脫鹽公司用“混合過濾”（hybridfiltration）來表示介于反滲透與超濾之間的膜分離過程，稱為松散反滲透（loose RO）膜。后來美國的Filmtec公司把這種膜技術(shù)稱為納濾，一直沿用至今。之后，納濾技術(shù)發(fā)展得很快，膜組件于80年代中期商品化。目前，納濾技術(shù)已成為世界膜分離領(lǐng)域研究的熱點之一。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?。?）納濾膜定義到目前為止，對納濾膜的準(zhǔn)確定義、機(jī)制、特征等的認(rèn)識還遠(yuǎn)遠(yuǎn)不充分。學(xué)術(shù)界比較統(tǒng)一的解釋納濾膜的定義包括以下七個方面：</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?納濾膜介于反滲透和超濾膜之間，其膜表面分離皮層可能具有納米級微孔結(jié)構(gòu)。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　② 相對于反滲透膜NaCI的脫除率均在95%以上，一般將NaCI脫除率為90%以下的膜均可稱之為納濾膜。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?反滲透膜幾乎對所有溶質(zhì)都有很高的脫除率，而納濾膜只對特定的溶質(zhì)具有脫除率。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　④ 納濾膜孔徑在1nm以上，一般1～2nm。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?主要去除一個納米左右的溶質(zhì)粒子，截留分子量在200～1000道爾頓。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?反滲透膜幾乎均為聚酰胺材質(zhì)，而納濾膜材料可采用多種材質(zhì)，如醋酸纖維素、醋酸-三醋酸纖維素、磺化聚砜、磺化聚醚砜、芳香聚酰胺復(fù)合材料和無機(jī)材料等。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?一般納濾膜的表面形成高聚物電解質(zhì)因而常常有較強(qiáng)的負(fù)電荷性。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?。?）納濾原理與超濾及反滲透等膜分離過程一樣，納濾也是以壓力差為推動力的膜分離過程，是一個不可逆過程。其分離機(jī)制可以運(yùn)用電荷模型（空間電荷模型和固定電荷模型）、細(xì)孔模型以及近年來才提出的靜電排斥和立體阻礙模型等來描述。與其他膜分離過程比較，納濾的一個優(yōu)點是能截留透過超濾膜的小分子量的有機(jī)物，又能透析反滲透膜所截留的部分無機(jī)鹽——也就是能使“濃縮”與脫鹽同步進(jìn)行。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　NF膜分離需要的跨膜壓差一般為0.5～2.0MPa，比用反滲透膜達(dá)到同樣的滲透能量所必須施加的壓差低0.5～3MPa。在同等的外加壓力下，納濾的通量要比反滲透大得多，而在通量一定時，納濾所需的壓力則比反滲透的低很多。所以用納濾代替反滲透時，“濃縮”過程可更有效、快速地進(jìn)行，并達(dá)到較大的“濃縮”倍數(shù)。一般來講，在使用納濾膜進(jìn)行的膜分離過程中，溶液中各種溶質(zhì)的截留率有如下規(guī)律：</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、匐S著摩爾質(zhì)量的增加而增加；</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、谠诮o定進(jìn)料濃度的情況下，隨著跨膜壓差的增加而增加；</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、墼诮o定壓力的情況下，隨著濃度的增加而下降；</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?對于陰離子來說，按NO3-、CI-、OH -、SO42-、CO42-順序上升。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?對于陽離子來說，按H+、Na+、K+、Ca2+、Mg2+、Cu2+順序上升。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?。?）納濾膜應(yīng)用納濾膜的這些性能決定了其在飲水處理中特有的廣闊的應(yīng)用，簡述如下。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　① 軟化：膜軟化水主要是利用納濾膜對不同價態(tài)離子的選擇透過特性而實現(xiàn)對水的軟化。膜軟化在去硬度的同時，還可以去除其中的濁度、色度和有機(jī)物，其出水水質(zhì)明顯優(yōu)于其他軟化工藝。而且膜軟化具有無須再生、無污染產(chǎn)生、操作簡單、占地面積省等優(yōu)點，具有明顯的社會效益和經(jīng)濟(jì)效益。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　膜軟化在美國已很普遍，佛羅里達(dá)州近10多年來新的軟化水廠都采用膜法軟化，代替常規(guī)的石灰軟化和離子交換過程。近幾年來，隨著納濾性能的不斷提高，納濾膜組件的價格不斷下降，膜軟化法在投資、操作、維護(hù)等方面已優(yōu)于或接近于常規(guī)法。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　?、?用于去除水中有機(jī)物：納濾膜在飲水處理中除了軟化之外，多用于脫色、去除天然有機(jī)物與合成有機(jī)物（如農(nóng)藥等）、三致物質(zhì)、消毒副產(chǎn)物（三鹵甲烷和鹵乙酸）及其前體和揮發(fā)性有機(jī)物，保證飲用水的生物穩(wěn)定性等。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　三致物質(zhì)的去除：研究表明，納濾膜能夠去除水中大部分的有毒有害的有機(jī)物和Ames致突變物，使TA98及TA100菌株在各試驗劑量下的致突比MR值均小于2 ，Ames試驗結(jié)果呈陰性。進(jìn)一步的研究將要考察納濾技術(shù)對飲水中的內(nèi)分泌干擾物質(zhì)的截留特性，為安全優(yōu)質(zhì)飲水提供依據(jù)。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　消毒副產(chǎn)物及其前體物的去除：消毒副產(chǎn)物主要包括三鹵甲烷（THMs）、鹵乙酸（HAAs）和可能的三氯乙醛氫氧化物（CH）。國外的科技工作者在這方面已開展了廣泛的研究，納濾膜對這三種消毒副產(chǎn)物的前體物的平均截留率分別為97%、94%和86%。通過合適的納濾膜的選用，可以使得飲用水水質(zhì)滿足更高的安全優(yōu)質(zhì)飲水水質(zhì)標(biāo)準(zhǔn)。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　此外，納濾出水是低腐蝕性的，對飲用水管網(wǎng)的使用期和管道金屬離子的溶出有正面的影響，有利于保護(hù)配水系統(tǒng)的所有材科。試驗表明采用必要后處理的納濾膜系統(tǒng)能夠使管網(wǎng)中鉛的溶解減少50%，同時使其他溶出的金屬離子濃度滿足飲水水質(zhì)標(biāo)準(zhǔn)要求。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　揮發(fā)性有機(jī)物（VOC）的去除：對飲用水中痕量揮發(fā)性有機(jī)物具有較高的去除率。</span></p><p><br/></p><p style="line-height: 1.75em;"><span style="font-family: 宋體 SimSun; font-size: 14px;">　　在管道直飲水中的應(yīng)用：納濾可以截留二價以上的離子和其他顆粒，所透過的只有水分子和一些一價的離子（如鈉、鉀、氯離子）。納濾可以用于生產(chǎn)直飲水，出水中仍保留一定的離子，并可降低處理費(fèi)用。</span></p><p style="; ; ; line-height: 30px; letter-spacing: 0.5px; color: rgb(51 51 51); font-family: 微軟雅黑 Arial Helvetica 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