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冷(leng)(leng)卻(que)水(shui)(shui)(shui)(shui)的(de)循(xun)環利用(yong)是工業節水(shui)(shui)(shui)(shui)的(de)主(zhu)要(yao)途徑。這種中(zhong)水(shui)(shui)(shui)(shui)利用(yong)技(ji)術主(zhu)要(yao)是經過冷(leng)(leng)卻(que)器變成的(de)熱水(shui)(shui)(shui)(shui)經過冷(leng)(leng)卻(que)構筑物使(shi)水(shui)(shui)(shui)(shui)溫降到(dao)回(hui)用(yong)水(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)溫，從而循(xun)環使(shi)用(yong)。冷(leng)(leng)卻(que)水(shui)(shui)(shui)(shui)在循(xun)環使(shi)用(yong)時，應注意(yi)水(shui)(shui)(shui)(shui)中(zhong)細菌的(de)繁(fan)殖(zhi)、水(shui)(shui)(shui)(shui)垢(gou)的(de)形成、設備腐蝕、水(shui)(shui)(shui)(shui)壓、水(shui)(shui)(shui)(shui)量變化等問題。

由于(yu)(yu)生(sheng)產(chan)工藝中(zhong)(zhong)各(ge)環節的(de)(de)用(yong)(yong)(yong)(yong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)質(zhi)標準(zhun)不(bu)一，因此將某些環節的(de)(de)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)經(jing)(jing)過適當的(de)(de)處理(li)后(hou)重復利用(yong)(yong)(yong)(yong)或用(yong)(yong)(yong)(yong)于(yu)(yu)其它對水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)質(zhi)要(yao)(yao)求不(bu)高的(de)(de)環節中(zhong)(zhong)。可以在第一次作(zuo)(zuo)為(wei)冷卻(que)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)使用(yong)(yong)(yong)(yong)后(hou)，用(yong)(yong)(yong)(yong)于(yu)(yu)其它對水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)質(zhi)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)溫要(yao)(yao)求較低的(de)(de)場合(he)。如可先將清水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)作(zuo)(zuo)為(wei)冷卻(que)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)用(yong)(yong)(yong)(yong)，然后(hou)送(song)入水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)處理(li)站經(jing)(jing)軟化(hua)后(hou)作(zuo)(zuo)鍋(guo)爐供(gong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)用(yong)(yong)(yong)(yong)。城市污(wu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)集中(zhong)(zhong)處理(li)后(hou)用(yong)(yong)(yong)(yong)于(yu)(yu)生(sheng)產(chan)、生(sheng)活(huo)等。在采用(yong)(yong)(yong)(yong)這個辦法時，要(yao)(yao)注意各(ge)車間供(gong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)系統的(de)(de)密切配合(he)，加(jia)強冷卻(que)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)的(de)(de)管理(li)，避(bi)免因一個環節出問題而(er)影響其他(ta)車間供(gong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)。 生(sheng)活(huo)中(zhong)(zhong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)，主要(yao)(yao)指生(sheng)活(huo)污(wu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)經(jing)(jing)過處理(li)，達到使用(yong)(yong)(yong)(yong)標準(zhun)后(hou)，用(yong)(yong)(yong)(yong)于(yu)(yu)沖廁、綠化(hua)、景觀、噴(pen)灑(sa)路(lu)面以及冷卻(que)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)的(de)(de)補(bu)充等雜(za)用(yong)(yong)(yong)(yong)。中(zhong)(zhong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)質(zhi)應(ying)達到《生(sheng)活(huo)雜(za)用(yong)(yong)(yong)(yong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)質(zhi)標準(zhun)》。

1、中水水源　　

選擇中水，應首(shou)先選用(yong)優質(zhi)雜排水，一般可按下列順(shun)序取舍：

A、冷卻水；

B、淋浴排水；

C、盥洗排水；

D、洗衣排水；

E、廚房排水；

F、廁所排水

2、處理工藝 　　

當以(yi)優質雜(za)排水(shui)和(he)雜(za)排水(shui)作(zuo)為中水(shui)水(shui)源時，可采用以(yi)物化(hua)處(chu)理(li)為主的工(gong)藝(yi)流程(cheng)，或采用生物處(chu)理(li)和(he)物化(hua)處(chu)理(li)的工(gong)藝(yi)流程(cheng)。 　　

當利用(yong)生活(huo)污水作為中水水源時，可(ke)采用(yong)二段生物(wu)處理，或(huo)生物(wu)處理與物(wu)化處理相結合(he)的處理工(gong)藝流程。

3、中(zhong)水(shui)設(she)計(ji)建設(she)規定 　　

凡(fan)建設(she)項目(mu)都應按規(gui)定同(tong)時配套(tao)設(she)計中水設(she)施(shi)(shi)，屬以下情況的(de)建設(she)項目(mu)必須(xu)配套(tao)設(she)計建設(she)中水設(she)施(shi)(shi)：

A、賓(bin)（旅）館、飯(fan)店、商店、公寓、綜合性服務樓及高層住宅等(deng)建筑(zhu)的建筑(zhu)面(mian)積在2萬(wan)平方米(mi)以上。 　　

B、機(ji)關(guan)、科研單位、大(da)專院校和大(da)型綜合性文化、體育設施的建筑面積在3萬平方米以上。 　　

C、住宅(zhai)小區規劃人口(kou)在3萬(wan)人以上（或中(zhong)水回用量在750立方米/日(ri)以上）。 　　

有關中(zhong)(zhong)水(shui)(shui)設施(shi)的管理(li)按(an)照(zhao)建(jian)設部發(fa)布的《城市(shi)中(zhong)(zhong)水(shui)(shui)設施(shi)管理(li)暫行(xing)(xing)辦法(fa)》執行(xing)(xing)，中(zhong)(zhong)水(shui)(shui)設施(shi)的設計按(an)中(zhong)(zhong)國工(gong)程建(jian)設標準化協會編制的《建(jian)筑中(zhong)(zhong)水(shui)(shui)設計規范》