CASS(Cyclic-Activated-Sludge-System)工(gong)藝(yi)是近(jin)年(nian)來國際公(gong)認的(de)處理生活(huo)污水(shui)及工(gong)業廢水(shui)的(de)先進(jin)工(gong)藝(yi)。其基本(ben)結(jie)構是：在序批(pi)式活(huo)性污泥(ni)法(SBR)的(de)基礎(chu)上，反(fan)應池沿池長方向設計為(wei)(wei)(wei)兩部(bu)分，前部(bu)為(wei)(wei)(wei)生物選擇區(qu)也稱預(yu)反(fan)應區(qu)，后(hou)部(bu)為(wei)(wei)(wei)主(zhu)反(fan)應區(qu)，其主(zhu)反(fan)應區(qu)后(hou)部(bu)安裝了可升降的(de)自動撇水(shui)裝置。整個工(gong)藝(yi)的(de)曝氣、沉淀(dian)、排(pai)水(shui)等過程在同(tong)一(yi)池子內周期循環運(yun)行，省去了常規活(huo)性污泥(ni)法的(de)二沉池和污泥(ni)回(hui)流系統;同(tong)時可連續進(jin)水(shui)，間斷排(pai)水(shui)。

該(gai)工(gong)(gong)(gong)藝(yi)最早在國(guo)(guo)外應(ying)用(yong)，為了(le)(le)更好地將其(qi)引進、消化(hua)，開發出(chu)適合(he)我(wo)國(guo)(guo)國(guo)(guo)情的(de)新型污(wu)水(shui)(shui)處(chu)理新工(gong)(gong)(gong)藝(yi)，總裝備部工(gong)(gong)(gong)程設(she)計研(yan)究(jiu)總院環(huan)保中心于(yu)1994年在實驗室進行了(le)(le)整套(tao)系統的(de)模擬(ni)試(shi)驗，分(fen)別(bie)探討了(le)(le)CASS工(gong)(gong)(gong)藝(yi)處(chu)理常溫(wen)生(sheng)活污(wu)水(shui)(shui)、低溫(wen)生(sheng)活污(wu)水(shui)(shui)、制藥和(he)化(hua)工(gong)(gong)(gong)等(deng)工(gong)(gong)(gong)業廢(fei)水(shui)(shui)的(de)機理和(he)特點以及水(shui)(shui)處(chu)理過程中脫氮(dan)除(chu)磷的(de)效果，獲得(de)了(le)(le)寶(bao)貴的(de)設(she)計參(can)數(shu)和(he)對工(gong)(gong)(gong)藝(yi)運行的(de)指導性(xing)經驗。我(wo)院將研(yan)究(jiu)成果成功地應(ying)用(yong)于(yu)處(chu)理生(sheng)活污(wu)水(shui)(shui)及不(bu)同種(zhong)工(gong)(gong)(gong)業廢(fei)水(shui)(shui)的(de)工(gong)(gong)(gong)程實踐(jian)中，取得(de)了(le)(le)良好的(de)經濟、社會(hui)和(he)環(huan)境效益。我(wo)院開發的(de)CASS工(gong)(gong)(gong)藝(yi)與ICEAS工(gong)(gong)(gong)藝(yi)相比，負荷(he)可(ke)提高1-2倍，節省占地和(he)工(gong)(gong)(gong)程投(tou)資近30%。

CASS工藝是(shi)將序批式活(huo)性污(wu)泥法(SBR)的反(fan)直池沿長度方向分為兩(liang)部(bu)分，前部(bu)為生物選擇(ze)區也稱預反(fan)應(ying)區，后部(bu)為主(zhu)反(fan)應(ying)區+在(zai)主(zhu)反(fan)應(ying)區后部(bu)安(an)裝了可升降(jiang)的潷水(shui)裝置，實現(xian)了連續進水(shui)間歇排(pai)水(shui)的周(zhou)期循(xun)環(huan)運行(xing)，集曝氣沉淀(dian)、排(pai)水(shui)于一體。CASS工藝是(shi)一個好氧(yang)/缺氧(yang)/厭氧(yang)交替運行(xing)的過程，具有一定(ding)脫氮除(chu)磷效果，廢水(shui)以(yi)推流(liu)方式運行(xing)，而各反(fan)應(ying)區則以(yi)完全(quan)混(hun)合的形式運行(xing)以(yi)實現(xian)同步硝化一反(fan)硝化和生物除(chu)磷。

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