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印染废水处理与回用工程实例

2012-10-15柳玉肖

城市建设理论研究 2012年18期

柳玉肖

摘要:采用“混凝+ABR+活性污泥+机械过滤”处理某毛紡厂的印染废水,出水COD在50mg/L以下,色度低于10倍,优于《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准,同时出水回用于大中色降温及大色染色工段,回用率60%以上,与改造前比,运行费用降低一半。

关键词:印染废水 ;回用;一级A ;排河

Abstract: Treating the printing and dyeing wastewater of A woolen mill with the" coagulation +activated sludge +ABR+ mechanical filtration ", the effluent COD is under 50mg/L, the chromaticity is less than 10 times, it is better than the" urban sewage treatment plant pollutant discharge standard" ( GB18918-2002) the level of A standard, at the same time ,the cooling water back is used in major cooling and large color dyeing process, the back rate is more than 60%, and compared with the transformation before, the operating cost is reduced to half.

Key words: printing and dyeing wastewater; reuse; level A; Pai River

中图分类号:X505文献标识码:A 文章编号:2095-2104(2012)

Abstract:The combined process of coagulating sedimentation, ABR, activated sludge and mechanical filtration is used to treat Hebei a woolen mill wastewater to achieve that the COD is below 50mg/L and color degree is low 10 times, which are better than the Standard A of "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB18918-2002). In addition, the output water is reused for water production plants, and the level of wastewater reuse is more than 90%, the operation cost has been reduced by half after the improvement.

Key words:woolen mill wastewater,reused,Standard A, discharge into River

前言

印染行业是高耗水行业,据不完全统计,截止2005年,国内印染行业每天排水量约450-500万吨,且因其处理难度。同时,印染废水经处理后回用率仅7%,是所有工业废水中最低的。随着水资源短缺及水质性缺水问题的日益突出,印染废水的处理和回用日益受到重视。

河北某毛纺厂生产高档防缩地毯纱,尾水达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准后可排河。同时,该企业生产用水取自地下水,而该地区为地下水超采区,水资源极其紧张。因此对其污水站进行了改造,实现了提标和中水回用。改造后的污水站于2008年正式投入使用,运行稳定,出水优于一级A标准,同时回用率达到60%。该企业是当地第一家达到排河标准的印染企业,为该地区印染废水处理及回用起到了带头示范作用,可供其它类似企业参考和借鉴。

1.工艺设计

1.1废水产生情况

该厂以羊毛、化纤为原料生产高档地毯纱,生产工艺流程如下:

产生生产废水(大约800 m3/d)及少量生活污水(20 m3/d)。生产废水主要为染色废水、染色机冲洗水、漂洗水,其中后两者约占80%,所用染料为分散染料、阳离子染料,主要助剂为元明粉、硫酸、纯碱等。……

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