燃煤(mei)電(dian)廠脫硫廢(fei)(fei)水(shui)(shui)(shui)(shui)屬于電(dian)廠末端(duan)最(zui)難(nan)處理(li)的廢(fei)(fei)水(shui)(shui)(shui)(shui),廢(fei)(fei)水(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)質(zhi)受燃煤(mei)品質(zhi)、石灰石品質(zhi)、脫硫系統(tong)的設計(ji)及運行(xing)、脫硫工藝(yi)補充水(shui)(shui)(shui)(shui)等因素影響,波動(dong)較大,表(biao)現出水(shui)(shui)(shui)(shui)質(zhi)組成復雜、高含鹽量、高腐蝕性等特點,成為(wei)制約電(dian)廠脫硫廢(fei)(fei)水(shui)(shui)(shui)(shui)零排放(fang)的關鍵(jian)因素。中試實驗結果表(biao)明,電(dian)驅離子膜(mo)裝(zhuang)置將(jiang)經(jing)過化學反(fan)應+管式(shi)膜(mo)預處理(li)的水(shui)(shui)(shui)(shui)濃縮(suo),濃水(shui)(shui)(shui)(shui)中總溶解(jie)固體TDS可(ke)(ke)(ke)濃縮(suo)至200000mg/L,產水(shui)(shui)(shui)(shui)可(ke)(ke)(ke)回用(yong)于循環(huan)水(shui)(shui)(shui)(shui)冷卻系統(tong),該工藝(yi)可(ke)(ke)(ke)滿(man)足脫硫廢(fei)(fei)水(shui)(shui)(shui)(shui)零排放(fang)的要求(qiu),可(ke)(ke)(ke)為(wei)將(jiang)來的項目提供可(ke)(ke)(ke)行(xing)性依據。  

脫硫(liu)(liu)廢水是在(zai)濕式煙(yan)氣脫硫(liu)(liu)過程中(zhong)產生的(de)(de)(de)一(yi)種具(ju)有危(wei)害(hai)性(xing)、難(nan)處理的(de)(de)(de)工(gong)(gong)業廢水,其成分復雜,水質變化波動大,具(ju)有高懸浮(fu)物含量、高鹽量和(he)(he)(he)硬度、易結垢和(he)(he)(he)腐蝕性(xing)強(qiang)等特點,同時(shi)含有一(yi)定量的(de)(de)(de)重金(jin)屬。目(mu)前采用的(de)(de)(de)常規三聯箱—中(zhong)和(he)(he)(he)、絮凝、沉淀工(gong)(gong)藝只(zhi)能去除其中(zhong)的(de)(de)(de)懸浮(fu)物和(he)(he)(he)絕大部分的(de)(de)(de)重金(jin)屬離子,對于(yu)其中(zhong)的(de)(de)(de)可溶性(xing)鹽并無去除作用。隨(sui)著排(pai)(pai)放標準的(de)(de)(de)日益嚴苛、環保要求的(de)(de)(de)逐步提高和(he)(he)(he)水資源的(de)(de)(de)持續短(duan)缺,實現脫硫(liu)(liu)廢水的(de)(de)(de)資源化與(yu)零排(pai)(pai)放刻不容緩。  

膜(mo)(mo)分(fen)離(li)(li)技(ji)術(shu)是一(yi)種(zhong)高(gao)效(xiao)、低耗(hao)且易操作(zuo)的(de)(de)液體分(fen)離(li)(li)技(ji)術(shu),與傳(chuan)統的(de)(de)水(shui)處(chu)理方法(fa)相比(bi),具(ju)(ju)有(you)處(chu)理效(xiao)果好(hao)、可實現(xian)廢(fei)(fei)水(shui)的(de)(de)循環利用(yong)(yong)及(ji)(ji)回收高(gao)附加值產品等優(you)點,是實現(xian)廢(fei)(fei)水(shui)資源化利用(yong)(yong)的(de)(de)有(you)效(xiao)技(ji)術(shu)。電(dian)(dian)(dian)滲(shen)析技(ji)術(shu)作(zuo)為一(yi)種(zhong)膜(mo)(mo)分(fen)離(li)(li)濃縮(suo)技(ji)術(shu),使(shi)用(yong)(yong)特(te)定(ding)的(de)(de)離(li)(li)子交(jiao)換膜(mo)(mo),其(qi)在直流電(dian)(dian)(dian)場的(de)(de)作(zuo)用(yong)(yong)下(xia)對(dui)(dui)溶液中(zhong)的(de)(de)陰(yin)(yin)陽離(li)(li)子具(ju)(ju)有(you)選擇透過(guo)(guo)性,即陰(yin)(yin)膜(mo)(mo)僅(jin)允許陰(yin)(yin)離(li)(li)子透過(guo)(guo),陽膜(mo)(mo)只允許陽離(li)(li)子透過(guo)(guo)。通過(guo)(guo)陰(yin)(yin)陽離(li)(li)子膜(mo)(mo)交(jiao)替排(pai)布形成濃、淡(dan)室,從而實現(xian)物(wu)料的(de)(de)濃縮(suo)與脫鹽(yan)。相較于反滲(shen)透過(guo)(guo)程(cheng),電(dian)(dian)(dian)滲(shen)析濃縮(suo)過(guo)(guo)程(cheng)為電(dian)(dian)(dian)場驅動,其(qi)進(jin)(jin)水(shui)要求(qiu)相對(dui)(dui)較低,僅(jin)對(dui)(dui)進(jin)(jin)水(shui)SS及(ji)(ji)強(qiang)氧(yang)化物(wu)、有(you)機溶劑等有(you)所(suo)限制,預處(chu)理過(guo)(guo)程(cheng)簡單。在保證進(jin)(jin)水(shui)條件下(xia),可進(jin)(jin)行(xing)拆(chai)解(jie)離(li)(li)線清洗,使(shi)用(yong)(yong)壽命長(chang)。而對(dui)(dui)于熱法(fa)蒸發過(guo)(guo)程(cheng),電(dian)(dian)(dian)滲(shen)析過(guo)(guo)程(cheng)在能耗(hao)、占地、投資等方面優(you)勢明顯。因此(ci)(ci)近年來,隨著工業高(gao)鹽(yan)廢(fei)(fei)水(shui)處(chu)理及(ji)(ji)零排(pai)放需(xu)求(qiu)提高(gao),電(dian)(dian)(dian)滲(shen)析技(ji)術(shu)以其(qi)上述(shu)獨特(te)優(you)勢在此(ci)(ci)領域的(de)(de)應(ying)用(yong)(yong)日益受到關注。為此(ci)(ci),針對(dui)(dui)脫硫廢(fei)(fei)水(shui)的(de)(de)水(shui)質(zhi)特(te)性,采用(yong)(yong)均相電(dian)(dian)(dian)驅離(li)(li)子膜(mo)(mo)濃縮(suo)工藝(yi)開展了相關的(de)(de)研究。  

1脫硫廢水零排放處理的難點  

脫(tuo)(tuo)硫廢水(shui)(shui)的(de)水(shui)(shui)質(zhi)主(zhu)要受(shou)燃(ran)煤品質(zhi)、石(shi)(shi)灰石(shi)(shi)品質(zhi)、脫(tuo)(tuo)硫系統(tong)(tong)的(de)設(she)(she)計及運行、脫(tuo)(tuo)硫工藝補(bu)充水(shui)(shui)、脫(tuo)(tuo)硫塔前污染物控制(zhi)設(she)(she)備(bei)以(yi)及脫(tuo)(tuo)水(shui)(shui)設(she)(she)備(bei)等的(de)影響。不同地區的(de)電廠差別(bie)很大,同一電廠因排放時間不固定,差別(bie)也(ye)很大;脫(tuo)(tuo)硫廢水(shui)(shui)間斷性(xing)排放,水(shui)(shui)量(liang)波動(dong)較大;廢水(shui)(shui)硬度高,易造(zao)成蒸發系統(tong)(tong)結(jie)垢;廢水(shui)(shui)中氯離子(zi)的(de)含量(liang)高,易造(zao)成系統(tong)(tong)腐蝕(shi)。以(yi)某(mou)電廠為例,脫(tuo)(tuo)硫廢水(shui)(shui)水(shui)(shui)質(zhi)見表1。  

表1某電廠脫硫廢水水質

2工藝原理  

電驅離子(zi)膜(mo)技(ji)術的原理(li)是利用(yong)陰(yin)、陽(yang)離子(zi)交換膜(mo)交替排(pai)列于正負電極之間,并(bing)用(yong)特(te)制的隔板(ban)將其隔開(kai),組成除鹽(淡(dan)化)和濃縮(suo)兩個系統(tong)。當向(xiang)隔室通入鹽水后,利用(yong)離子(zi)交換膜(mo)對(dui)陰(yin)陽(yang)離子(zi)的選擇透過性能,在(zai)直流電場作(zuo)用(yong)下(xia)陰(yin)、陽(yang)離子(zi)分別向(xiang)陽(yang)極和陰(yin)極移動,達到電解質溶液的分離、提純和濃縮(suo)。  

3試驗過程  

3.1試驗材料及分析方法  

中試設備(bei)主要(yao)組成為:膜(mo)堆(含120對膜(mo)片(pian),每(mei)片(pian)膜(mo)面積(ji)0.5m2)、整流器、原水箱、濃縮水箱、加(jia)酸泵、陰極(ji)液槽和陽極(ji)液槽。  

試(shi)驗分析(xi)儀器:DR6000紫外可見分光光度(du)計(ji)、ME分析(xi)天平、電(dian)熱(re)恒溫烘箱、滴定裝置、原(yuan)子吸收、電(dian)導率儀、pH計(ji)。水質(zhi)檢(jian)測項目主要(yao)有:總硬度(du)、電(dian)導率、TDS、Cl-、F-、SO42-、pH等,檢(jian)測依據標準參照《鍋爐用水和冷卻水分析(xi)方(fang)法通則》(GB/T6903-2005)。  

本次試驗所用藥劑為：30%氫(qing)氧化鈉、30%鹽酸、固體碳酸鈉、固體硫酸鈉、亞硫酸氫(qing)鈉。  

試驗主要(yao)目的(de)是取通過加藥軟化預處理(li)和管式膜固液分離后(hou)的(de)產水,測試電驅離子膜設備對脫硫廢水的(de)濃縮情況,最大限度的(de)減(jian)少進入后(hou)續蒸發裝置的(de)濃水量。  

3.2工藝流程  

試驗工(gong)藝流(liu)程見圖1。  

圖1試驗工藝流程圖  

經常規處理(li)后(hou)的脫(tuo)硫廢水(shui)(shui)進(jin)(jin)入(ru)廢水(shui)(shui)收(shou)集池,進(jin)(jin)行(xing)重力沉淀(dian),經提升進(jin)(jin)入(ru)反(fan)(fan)應(ying)槽1,加氫氧化(hua)鈉(na)調節pH值,控制pH大于11,使氫氧化(hua)鎂沉淀(dian);反(fan)(fan)應(ying)槽1出(chu)水(shui)(shui)進(jin)(jin)入(ru)反(fan)(fan)應(ying)槽2,加入(ru)碳酸鈉(na)溶液(ye),與水(shui)(shui)中的鈣離子生成碳酸鈣沉淀(dian),混合液(ye)進(jin)(jin)入(ru)濃(nong)縮(suo)槽,由循(xun)環泵輸送至(zhi)管(guan)式膜進(jin)(jin)行(xing)固液(ye)分離,此時大流(liu)(liu)量的水(shui)(shui)回流(liu)(liu)至(zhi)濃(nong)縮(suo)槽,保持濃(nong)縮(suo)槽中的混合狀態;部分透過水(shui)(shui)經投加氫氧化(hua)鈉(na)回調pH值后(hou)進(jin)(jin)入(ru)ED原水(shui)(shui)箱。  

電驅離子膜整流(liu)器(qi)運行(xing)為穩壓運行(xing),運行(xing)電壓為60V;極(ji)(ji)液(ye):5%Na2SO4(陰極(ji)(ji)液(ye)pH<2.5,陽(yang)極(ji)(ji)液(ye)pH<7);系統(tong)進水1m3/h,陰極(ji)(ji)液(ye)循(xun)(xun)環(huan)(huan)流(liu)量2m3/h,陽(yang)極(ji)(ji)液(ye)循(xun)(xun)環(huan)(huan)流(liu)量2m3/h,濃(nong)水循(xun)(xun)環(huan)(huan)量4.5m3/h,脫鹽(yan)水循(xun)(xun)環(huan)(huan)量7.5m3/h,保證膜面(mian)流(liu)速(su)。  

4試驗結果與討論  

4.1進水TDS變化對脫鹽水和濃縮水TDS的影響  

由于脫硫廢水(shui)水(shui)質波動較大(da),試驗收集了(le)不同(tong)濃(nong)度的廢水(shui),研究了(le)不同(tong)脫硫廢水(shui)濃(nong)度條件下的電(dian)驅離(li)子膜(mo)運行工況(圖(tu)(tu)2)。其中(zhong),下述所列圖(tu)(tu)中(zhong),橫(heng)坐標(biao)(biao)數(shu)據取樣時間不同(tong),橫(heng)坐標(biao)(biao)數(shu)據1~5代(dai)表進水(shui)TDS4000mg/L,7~12代(dai)表進水(shui)TDS10000mg/L,14~20代(dai)表進水(shui)TDS30000mg/L,三組圖(tu)(tu)2~圖(tu)(tu)5內橫(heng)坐標(biao)(biao)代(dai)表意義(yi)相同(tong)。  

圖(tu)2TDS關系曲線(xian)圖(tu)  

ED進(jin)(jin)(jin)(jin)水(shui)原水(shui)取自管式膜產(chan)水(shui),ED裝(zhuang)置出(chu)水(shui)口(kou)產(chan)生兩(liang)種水(shui),一種是(shi)濃(nong)(nong)(nong)縮(suo)(suo)(suo)水(shui),一種是(shi)脫鹽水(shui)。進(jin)(jin)(jin)(jin)水(shui)TDS為(wei)4000mg/L左(zuo)右時,ED膜出(chu)口(kou)濃(nong)(nong)(nong)縮(suo)(suo)(suo)水(shui)TDS約為(wei)50000mg/L;隨(sui)著進(jin)(jin)(jin)(jin)水(shui)濃(nong)(nong)(nong)度(du)(du)(du)梯度(du)(du)(du)增加;當(dang)進(jin)(jin)(jin)(jin)水(shui)TDS為(wei)10000mg/L,ED膜出(chu)口(kou)濃(nong)(nong)(nong)縮(suo)(suo)(suo)水(shui)TDS約為(wei)150000~170000mg/L;進(jin)(jin)(jin)(jin)水(shui)TDS為(wei)30000mg/L,ED膜出(chu)口(kou)濃(nong)(nong)(nong)縮(suo)(suo)(suo)水(shui)TDS約為(wei)200000mg/L;進(jin)(jin)(jin)(jin)水(shui)TDS濃(nong)(nong)(nong)度(du)(du)(du)增加,ED膜出(chu)口(kou)濃(nong)(nong)(nong)縮(suo)(suo)(suo)水(shui)TDS濃(nong)(nong)(nong)度(du)(du)(du)與進(jin)(jin)(jin)(jin)水(shui)TDS呈正相(xiang)關升(sheng)高。  

通過(guo)比(bi)較,在進(jin)(jin)水(shui)TDS約為30000mg/L時為ED裝(zhuang)置運(yun)行最優狀態;ED膜出(chu)口濃縮水(shui)TDS基本大于200000mg/L(含鹽(yan)量>20%),濃縮水(shui)濃度達到(dao)最高,減少了濃水(shui)量;該濃縮水(shui)進(jin)(jin)入后(hou)續蒸發后(hou),可(ke)縮短結晶周期。隨進(jin)(jin)水(shui)TDS濃度增高,ED裝(zhuang)置出(chu)口脫(tuo)鹽(yan)水(shui)TDS濃度稍微增加,但總體(ti)低于5000mg/L,ED裝(zhuang)置可(ke)與(yu)RO耦(ou)合使用,RO將脫(tuo)鹽(yan)水(shui)進(jin)(jin)一步處(chu)理回收利用。  

4.2進水TDS變化對電流效率的影響  

電(dian)(dian)流(liu)(liu)效率(lv)(lv)表示(shi)電(dian)(dian)滲析過程(cheng)中電(dian)(dian)流(liu)(liu)利(li)用(yong)程(cheng)度,為(wei)(wei)單位時間(jian)內實際脫鹽率(lv)(lv)與(yu)理(li)論脫鹽率(lv)(lv)的百分比,對(dui)不同進(jin)(jin)水(shui)TDS濃度下的電(dian)(dian)流(liu)(liu)效率(lv)(lv)進(jin)(jin)行(xing)(xing)比較(jiao)(圖3)。電(dian)(dian)流(liu)(liu)效率(lv)(lv)在(zai)進(jin)(jin)水(shui)TDS為(wei)(wei)4000mg/L和30000mg/L時高于進(jin)(jin)水(shui)TDS10000mg/L。當進(jin)(jin)水(shui)TDS為(wei)(wei)4000mg/L時,運行(xing)(xing)電(dian)(dian)壓(ya)60V,電(dian)(dian)流(liu)(liu)由水(shui)中離子(zi)的遷移量決定;進(jin)(jin)水(shui)TDS為(wei)(wei)30000mg/L時,運行(xing)(xing)電(dian)(dian)壓(ya)60V,水(shui)中離子(zi)濃度高,離子(zi)的遷移量由電(dian)(dian)流(liu)(liu)決定;而進(jin)(jin)水(shui)TDS為(wei)(wei)10000mg/L時,在(zai)相同電(dian)(dian)壓(ya)下,離子(zi)濃度相對(dui)較(jiao)低(di),在(zai)膜界面上產生了(le)濃差極化,所以電(dian)(dian)流(liu)(liu)效率(lv)(lv)相對(dui)較(jiao)低(di)。運行(xing)(xing)全過程(cheng)中,總的電(dian)(dian)流(liu)(liu)效率(lv)(lv)約為(wei)(wei)80%。  

圖3TDS與(yu)電流效率關系曲線圖  

4.3進水TDS變化對離子遷移通量和噸水能耗的影響  

隨著原(yuan)水(shui)(shui)(shui)TDS的升高,離(li)子(zi)(zi)(zi)遷(qian)移(yi)通(tong)量(liang)(liang)以(yi)及(ji)噸(dun)水(shui)(shui)(shui)電耗逐步(bu)升高(圖4)。進水(shui)(shui)(shui)TDS4000mg/L時,離(li)子(zi)(zi)(zi)遷(qian)移(yi)通(tong)量(liang)(liang)小于1eq/(m2˙h),噸(dun)水(shui)(shui)(shui)能耗小于1kw˙h;進水(shui)(shui)(shui)TDS10000mg/L時,離(li)子(zi)(zi)(zi)遷(qian)移(yi)通(tong)量(liang)(liang)約2eq/(m2˙h),噸(dun)水(shui)(shui)(shui)能耗2~3kw˙h;進水(shui)(shui)(shui)TDS30000mg/L時,離(li)子(zi)(zi)(zi)遷(qian)移(yi)通(tong)量(liang)(liang)約6eq/(m2˙h),噸(dun)水(shui)(shui)(shui)能耗6~7kw˙h。噸(dun)水(shui)(shui)(shui)能耗隨著離(li)子(zi)(zi)(zi)遷(qian)移(yi)通(tong)量(liang)(liang)的增加而(er)增大。  

圖(tu)(tu)4TDS對離(li)子(zi)遷移通量和(he)噸水能耗的(de)關系曲(qu)線圖(tu)(tu) &nbsp;

4.4進水TDS變化對脫鹽率的影響  

試驗考察了不同進(jin)水TDS濃(nong)度(4000mg/L、10000mg/L、30000mg/L)下的(de)(de)脫(tuo)鹽(yan)率的(de)(de)變(bian)化(圖5),通過分(fen)析,脫(tuo)鹽(yan)率隨(sui)著(zhu)進(jin)水濃(nong)度的(de)(de)升(sheng)高在脫(tuo)鹽(yan)率80%左(zuo)右波(bo)動(dong),脫(tuo)鹽(yan)率受水質(zhi)波(bo)動(dong)影響不大,不同試驗條件下的(de)(de)脫(tuo)鹽(yan)率總體不低于80%。  

圖5TDS與脫(tuo)鹽率關系曲(qu)線(xian)圖  

4.5水質檢測結果  

產水(shui)水(shui)質(zhi)檢測結(jie)果見表2。  

表2產水(shui)水(shui)質分析  

由表2可(ke)知(zhi),進水(shui)TDS5300mg/L時(shi),ED膜對(dui)水(shui)的濃(nong)(nong)(nong)(nong)縮(suo)倍(bei)(bei)數(shu)(shu)為11;進水(shui)TDS10253mg/L時(shi),濃(nong)(nong)(nong)(nong)縮(suo)倍(bei)(bei)數(shu)(shu)為13.6倍(bei)(bei);進水(shui)濃(nong)(nong)(nong)(nong)度TDS30000mg/L時(shi),其(qi)濃(nong)(nong)(nong)(nong)縮(suo)倍(bei)(bei)數(shu)(shu)將近7倍(bei)(bei),濃(nong)(nong)(nong)(nong)水(shui)TDS達到(dao)上限(200000mg/L)。隨(sui)著進水(shui)濃(nong)(nong)(nong)(nong)度的升高,電驅離子(zi)膜濃(nong)(nong)(nong)(nong)縮(suo)達到(dao)的濃(nong)(nong)(nong)(nong)水(shui)濃(nong)(nong)(nong)(nong)度進一步(bu)提升200000mg/L,濃(nong)(nong)(nong)(nong)縮(suo)倍(bei)(bei)數(shu)(shu)與進水(shui)濃(nong)(nong)(nong)(nong)度無(wu)明顯相(xiang)關性(xing),但電驅離子(zi)膜裝(zhuang)置的濃(nong)(nong)(nong)(nong)縮(suo)效(xiao)率(lv)受進水(shui)濃(nong)(nong)(nong)(nong)度的影響(xiang)較(jiao)大;進水(shui)濃(nong)(nong)(nong)(nong)度TDS30000mg/L時(shi),電驅離子(zi)膜裝(zhuang)置可(ke)利(li)用其(qi)最(zui)大效(xiao)率(lv)。  

5結論  

與傳統(tong)(tong)軟化預(yu)(yu)處(chu)(chu)理(li)相比(bi),脫(tuo)硫(liu)廢(fei)水(shui)(shui)(shui)經過化學(xue)反應(ying)和管式膜(mo)過濾的(de)軟化預(yu)(yu)處(chu)(chu)理(li)工藝(yi)后,流程大大縮(suo)(suo)短(duan)。管式膜(mo)產(chan)水(shui)(shui)(shui)進(jin)入電(dian)(dian)驅離(li)子膜(mo)裝(zhuang)(zhuang)置(zhi)進(jin)行(xing)濃(nong)(nong)縮(suo)(suo),進(jin)水(shui)(shui)(shui)水(shui)(shui)(shui)質波動對(dui)電(dian)(dian)驅離(li)子膜(mo)膜(mo)元件的(de)電(dian)(dian)流效率(lv)(lv)(lv)、產(chan)水(shui)(shui)(shui)率(lv)(lv)(lv)、脫(tuo)鹽(yan)率(lv)(lv)(lv)有(you)不(bu)(bu)同(tong)程度(du)的(de)影(ying)響(xiang)。通(tong)過實(shi)驗(yan)得知,在進(jin)水(shui)(shui)(shui)濃(nong)(nong)度(du)增高(gao)時,電(dian)(dian)流效率(lv)(lv)(lv)較(jiao)大,產(chan)水(shui)(shui)(shui)率(lv)(lv)(lv)和脫(tuo)鹽(yan)率(lv)(lv)(lv)均能(neng)保(bao)持穩(wen)定(ding)水(shui)(shui)(shui)平(ping),電(dian)(dian)驅離(li)子膜(mo)裝(zhuang)(zhuang)置(zhi)的(de)濃(nong)(nong)縮(suo)(suo)倍率(lv)(lv)(lv)受進(jin)水(shui)(shui)(shui)濃(nong)(nong)度(du)影(ying)響(xiang)較(jiao)大,進(jin)水(shui)(shui)(shui)TDS約30000mg/L時,濃(nong)(nong)水(shui)(shui)(shui)TDS可以達到(dao)200000mg/L,將濃(nong)(nong)水(shui)(shui)(shui)減量,減輕(qing)后續蒸(zheng)發結晶(jing)裝(zhuang)(zhuang)置(zhi)的(de)運行(xing)壓(ya)力(li),產(chan)水(shui)(shui)(shui)可回(hui)用(yong)于循(xun)環水(shui)(shui)(shui)冷卻系統(tong)(tong),實(shi)現廢(fei)水(shui)(shui)(shui)零(ling)排放處(chu)(chu)理(li)。相比(bi)熱法濃(nong)(nong)縮(suo)(suo),電(dian)(dian)驅離(li)子膜(mo)濃(nong)(nong)縮(suo)(suo)廢(fei)水(shui)(shui)(shui)所需電(dian)(dian)耗較(jiao)低,不(bu)(bu)需要其(qi)他能(neng)耗,并且(qie)不(bu)(bu)會造成熱損失,也(ye)不(bu)(bu)需要新鮮水(shui)(shui)(shui)源。因(yin)此采用(yong)電(dian)(dian)驅離(li)子膜(mo)技術對(dui)高(gao)鹽(yan)水(shui)(shui)(shui)或者脫(tuo)硫(liu)廢(fei)水(shui)(shui)(shui)進(jin)行(xing)濃(nong)(nong)縮(suo)(suo)處(chu)(chu)理(li)具有(you)更(geng)大的(de)推(tui)廣價值和意義。

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