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<p>　　通常判斷超純水設(shè)備EDI膜塊被污染堵塞從四個(gè)方面進(jìn)行評估判定：</p><p>　　1、在進(jìn)水溫度、流量不變的情況下，進(jìn)水側(cè)與產(chǎn)水側(cè)的壓差比原始數(shù)據(jù)升高45%。</p><p>　　2、在進(jìn)水溫度、流量不變的情況下，濃水進(jìn)水側(cè)與濃水排水側(cè)的壓差比原始數(shù)據(jù)升高45%。</p><p>　　3、在進(jìn)水溫度、流量及電導(dǎo)率不變的情況下，產(chǎn)水水質(zhì)（電阻率）明顯下降。</p><p>　　4、在進(jìn)水溫度、流量不變的情況下，濃水排水流量下降35%。</p><p>　　超純水設(shè)備EDI膜塊堵塞的原因，主要有下面幾種形式：</p><p>　　1、顆粒/膠體污堵</p><p>　　進(jìn)水顆粒度≥5μm時(shí)會造成進(jìn)水流道堵塞，引起模塊內(nèi)部水流分布不均勻，從而導(dǎo)致模塊整體性能降低。如果EDI模塊的進(jìn)水不是直接由RO產(chǎn)水端進(jìn)入EDI模塊，而是通過RO產(chǎn)水箱經(jīng)過增壓泵供水，建議在進(jìn)入EDI模塊前端增設(shè)保安過濾器（≤0.2μm）。在組裝EDI設(shè)備時(shí)，所有的連接管道系統(tǒng)應(yīng)沖洗干凈以管道內(nèi)的顆粒雜質(zhì)進(jìn)入模塊。</p><p>　　2、無機(jī)物污堵</p><p>　　如果EDI進(jìn)水含有較多的溶質(zhì)且超出設(shè)計(jì)值或者回收率超過設(shè)計(jì)值時(shí),將導(dǎo)致濃水室和陰極室的結(jié)垢，生成鹽類物質(zhì)析出沉淀，通常結(jié)垢的類型為鈣、鎂離子生成的碳酸鹽。即便這類物質(zhì)的濃度很小，接觸時(shí)間也很短，但隨著運(yùn)行時(shí)間的累加，仍有發(fā)生結(jié)垢的可能，這種硬度結(jié)垢很容易通過酸洗去除。使用低pH溶液在系統(tǒng)內(nèi)部循環(huán)清洗，可以去除濃水室和陰極室的結(jié)垢。</p><p>　　3、有機(jī)物污堵</p><p>　　當(dāng)進(jìn)水有機(jī)污染物TOC或TEA含量超過設(shè)計(jì)標(biāo)準(zhǔn)時(shí)，淡水室的離子交換樹脂和離子模會發(fā)生有機(jī)污堵。</p><p>　　4、微生物污堵</p><p>　　當(dāng)設(shè)備運(yùn)行環(huán)境適于微生物生長，或者進(jìn)水中存在較多的和藻類的時(shí)候，EDI模塊和系統(tǒng)也會發(fā)生微生物污堵。</p><p><br/></p> 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