湖南省某肉食加工中(zhong)心屠宰(zai)廠日屠宰(zai)量為2 800頭生豬。所排放廢(fei)水(shui)中(zhong)含(han)有大量血污(wu)、毛皮、碎 肉、內臟(zang)雜質、未消化食物以及糞便等污(wu)染物，懸(xuan)浮物濃(nong)度高(gao).水(shui)呈現(xian)粉紅色并帶(dai)有明(ming)顯腥臭(chou)味。該(gai)加工中(zhong)心位于(yu)湘江重(zhong)點水(shui)污(wu)染控制流域.對排放的廢(fei)水(shui)水(shui)質要(yao)求嚴格。為了節約水(shui)資(zi)源(yuan)，確保湘江水(shui)源(yuan)安全(quan)，加工中(zhong)心確定采用中(zhong)水(shui)回(hui)用工藝以實(shi)現(xian)廢(fei)水(shui)零(ling)排放。

1.水質與水量

1.1 廢水水量

該(gai)加(jia)(jia)工(gong)中心(xin)屠宰及肉制品加(jia)(jia)工(gong)過程每(mei)(mei)天排(pai)放廢水(shui)164m3.另外廠區每(mei)(mei)天排(pai)放生活(huo)廢水(shui)55m，本項(xiang)目設(she)計處理(li)量(liang)2000m3/d 廢水(shui)處理(li)系統每(mei)(mei)天運行(xing)時(shi)間按(an)24h計算.則每(mei)(mei)小時(shi)的設(she)計處理(li)水(shui)量(liang)為85m。

1.2廢水水質

該廢水(shui)(shui)所含污染物(wu)(wu)主要(yao)為呈溶解、膠體和懸浮等物(wu)(wu)理形態的有機(ji)物(wu)(wu)質，易(yi)于生物(wu)(wu)降解。具體廢水(shui)(shui)水(shui)(shui)質見表1。

考慮到處理后(hou)的廢水(shui)(shui)(shui)(shui)需要作(zuo)為(wei)中水(shui)(shui)(shui)(shui)回用(yong)(yong)(yong).出水(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)質要求較《肉類加工工業污水(shui)(shui)(shui)(shui)排放標(biao)準》(GB 13457--1992)嚴格，需要達到《城市污水(shui)(shui)(shui)(shui)再生利(li)用(yong)(yong)(yong)一城市雜用(yong)(yong)(yong)水(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)質》要求的中水(shui)(shui)(shui)(shui)回用(yong)(yong)(yong)標(biao)準。出水(shui)(shui)(shui)(shui)具體水(shui)(shui)(shui)(shui)質指標(biao)見表2。

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