EDI( Electrodeionization)連續(xu)(xu)電(dian)(dian)(dian)除鹽技(ji)(ji)術(shu),它(ta)(ta)科學(xue)地將電(dian)(dian)(dian)滲析技(ji)(ji)術(shu)和離(li)(li)子交(jiao)換技(ji)(ji)術(shu)融合為(wei)一體,通過(guo)陽(yang)、陰離(li)(li)子膜(mo)對陽(yang)、陰離(li)(li)子的選擇(ze)透(tou)過(guo)作用(yong)以及離(li)(li)子交(jiao)換樹(shu)脂對水(shui)(shui)中(zhong)離(li)(li)子的交(jiao)換作用(yong),在電(dian)(dian)(dian)場的作用(yong)下實現水(shui)(shui)中(zhong)離(li)(li)子的定向(xiang)遷(qian)移，從而達到水(shui)(shui)的深度(du)進化(hua)除鹽,并通過(guo)水(shui)(shui)電(dian)(dian)(dian)解(jie)產(chan)生(sheng)(sheng)的氫離(li)(li)子和氫氧根離(li)(li)子對樹(shu)脂進行連續(xu)(xu)再生(sheng)(sheng),因(yin)此ED制水(shui)(shui)過(guo)程(cheng)不(bu)需要酸、堿化(hua)學(xue)藥(yao)(yao)品(pin)再生(sheng)(sheng)即可(ke)連續(xu)(xu)制取高品(pin)質超純水(shui)(shui),它(ta)(ta)具(ju)有技(ji)(ji)術(shu)先(xian)進、結構(gou)緊湊、操作簡單(dan)的優點(dian),可(ke)廣泛應用(yong)于電(dian)(dian)(dian)力、電(dian)(dian)(dian)子醫藥(yao)(yao)、化(hua)工、食品(pin)和實驗室領域(yu)，是水(shui)(shui)處理技(ji)(ji)術(shu)的綠色革命(ming)。

EDI超(chao)純(chun)水(shui)(shui)設(she)備(bei)受成(cheng)本、環境(jing)和質量(liang)因素(su)的(de)影響， 超(chao)純(chun)水(shui)(shui)的(de)生(sheng)(sheng)產(chan)工(gong)藝在最近的(de)幾十年內(nei)經(jing)歷了很(hen)多(duo)變化。一個(ge)趨勢特別明(ming)顯，即減少(shao)對離(li)子(zi)交(jiao)換(huan)(IX)的(de)依賴(lai)程度，其目(mu)的(de)在于(yu)將(jiang)化學(xue)藥品使(shi)用(yong)(yong)(yong)減少(shao)到最低，并提高水(shui)(shui)的(de)利用(yong)(yong)(yong)率。反滲透(RO)技(ji)(ji)術能(neng)將(jiang)水(shui)(shui)中95%-98%的(de)離(li)子(zi)去除(chu)，從而大(da)大(da)減少(shao)了酸堿的(de)用(yong)(yong)(yong)量(liang)，但還不能(neng)完全不使(shi)用(yong)(yong)(yong)化學(xue)藥品。為了制(zhi)備(bei)超(chao)純(chun)水(shui)(shui)，通(tong)常(chang)采用(yong)(yong)(yong)反滲透+混床(chuang)工(gong)藝。混床(chuang)離(li)子(zi)交(jiao)換(huan)技(ji)(ji)術一直作(zuo)為超(chao)純(chun)水(shui)(shui)制(zhi)備(bei)的(de)標(biao)準(zhun)工(gong)藝。由于(yu)其需(xu)要周期性的(de)再生(sheng)(sheng)，在再生(sheng)(sheng)過程中使(shi)用(yong)(yong)(yong)相應的(de)化學(xue)藥品(酸堿)，已(yi)無法滿足現代工(gong)業(ye)清潔生(sheng)(sheng)產(chan)和環保的(de)需(xu)要。于(yu)是將(jiang)電滲析技(ji)(ji)術和離(li)子(zi)交(jiao)換(huan)技(ji)(ji)術有機結合形成(cheng)的(de)EDI技(ji)(ji)術成(cheng)為水(shui)(shui)處理技(ji)(ji)術的(de)一場革命。