EDI( Electrodeionization)連(lian)續(xu)電(dian)(dian)(dian)除鹽技(ji)術(shu),它(ta)(ta)科學地將電(dian)(dian)(dian)滲析技(ji)術(shu)和(he)離(li)(li)子(zi)交換技(ji)術(shu)融合為一體,通過(guo)陽、陰離(li)(li)子(zi)膜(mo)對陽、陰離(li)(li)子(zi)的選擇透過(guo)作(zuo)(zuo)(zuo)用(yong)(yong)(yong)以(yi)及離(li)(li)子(zi)交換樹(shu)脂(zhi)對水中(zhong)離(li)(li)子(zi)的交換作(zuo)(zuo)(zuo)用(yong)(yong)(yong),在電(dian)(dian)(dian)場的作(zuo)(zuo)(zuo)用(yong)(yong)(yong)下實(shi)現水中(zhong)離(li)(li)子(zi)的定向遷(qian)移，從(cong)而達(da)到水的深度進化(hua)除鹽,并通過(guo)水電(dian)(dian)(dian)解產生的氫離(li)(li)子(zi)和(he)氫氧根離(li)(li)子(zi)對樹(shu)脂(zhi)進行連(lian)續(xu)再生,因此ED制水過(guo)程不需(xu)要酸、堿化(hua)學藥(yao)品(pin)再生即可連(lian)續(xu)制取高品(pin)質超純水,它(ta)(ta)具有(you)技(ji)術(shu)先進、結構緊湊、操作(zuo)(zuo)(zuo)簡單的優點,可廣泛應(ying)用(yong)(yong)(yong)于電(dian)(dian)(dian)力、電(dian)(dian)(dian)子(zi)醫藥(yao)、化(hua)工、食品(pin)和(he)實(shi)驗室領(ling)域，是水處理(li)技(ji)術(shu)的綠(lv)色(se)革命。

EDI超純(chun)水(shui)(shui)(shui)(shui)設備(bei)受(shou)成(cheng)本、環(huan)境和質(zhi)量因(yin)素(su)的(de)(de)影響， 超純(chun)水(shui)(shui)(shui)(shui)的(de)(de)生(sheng)(sheng)產(chan)工(gong)(gong)(gong)藝在最近的(de)(de)幾十年內經歷了(le)很多(duo)變化。一(yi)個趨(qu)勢特(te)別明顯，即減少對離(li)(li)子交換(huan)(IX)的(de)(de)依賴(lai)程度，其(qi)目(mu)的(de)(de)在于將化學藥品使(shi)用(yong)(yong)減少到最低，并提高水(shui)(shui)(shui)(shui)的(de)(de)利用(yong)(yong)率(lv)。反(fan)滲透(tou)(RO)技術(shu)(shu)能(neng)將水(shui)(shui)(shui)(shui)中(zhong)95%-98%的(de)(de)離(li)(li)子去除(chu)，從(cong)而大(da)大(da)減少了(le)酸堿(jian)的(de)(de)用(yong)(yong)量，但還(huan)不能(neng)完全(quan)不使(shi)用(yong)(yong)化學藥品。為了(le)制備(bei)超純(chun)水(shui)(shui)(shui)(shui)，通常采用(yong)(yong)反(fan)滲透(tou)+混床(chuang)工(gong)(gong)(gong)藝。混床(chuang)離(li)(li)子交換(huan)技術(shu)(shu)一(yi)直作為超純(chun)水(shui)(shui)(shui)(shui)制備(bei)的(de)(de)標準工(gong)(gong)(gong)藝。由于其(qi)需要周期性的(de)(de)再生(sheng)(sheng)，在再生(sheng)(sheng)過程中(zhong)使(shi)用(yong)(yong)相應(ying)的(de)(de)化學藥品(酸堿(jian))，已無法(fa)滿足現代工(gong)(gong)(gong)業清潔生(sheng)(sheng)產(chan)和環(huan)保的(de)(de)需要。于是將電滲析技術(shu)(shu)和離(li)(li)子交換(huan)技術(shu)(shu)有機結合形成(cheng)的(de)(de)EDI技術(shu)(shu)成(cheng)為水(shui)(shui)(shui)(shui)處理(li)技術(shu)(shu)的(de)(de)一(yi)場革命。