印染废水的水质随采用的纤维种类和加工工艺的不同而异，污染物组分差异很大。印染各工序的排水情况一般是： The water quality of printing and dyeing wastewater is different from the variety of fiber variety and processing technique, and the composition of pollutants is very different. The drainage of each process is usually: 退浆废水：水量较小，但污染物浓度高，其中含有各种浆料、浆料分解物、纤维屑、淀粉碱和各种助剂。废水呈碱性，pH值为12左右。上浆以淀粉为主的(如棉布)退浆废水，其COD、BOD值都很高，可生化性较好；上浆以聚乙烯醇(PVA)为主的(如涤棉经纱)退浆废水，COD高而BOD低，废水可生化性较差。 Desizing waste water: the amount of water is small, but the pollutant concentration is high, it contains various kinds of slurry, slurry, fiber, starch base and various additives. The waste water is alkaline and has a pH of about 12. The starch is mainly made of starch, and its COD and BOD are both high and biochemical. The pulp is mainly made of polyvinyl alcohol (PVA), which is high in COD and low in BOD, and the waste water is less biochemical. 煮炼废水：水量大，污染物浓度高，其中含有纤维素、果酸、蜡质、油脂、碱、表面活性剂、含氮化合物等，废水呈强碱性，水温高，呈褐色。 Scouring wastewater: water, pollutant concentration is high, it contains cellulose, fruit acid, wax, oil, alkali, surfactant and nitrogen compounds, a strong alkaline wastewater, the water temperature is high, brownish. 漂白废水：水量大，但污染较轻，其中含有残余的漂白剂、少量醋酸、草酸、硫代硫酸钠等。 Bleaching waste water: large amount of water, but less polluted, including residual bleach, small amount of acetic acid, oxalic acid and sodium thiosulfate, etc. 丝光废水：含碱量高，NaOH含量在3%～5%，多数印染厂通过蒸发浓缩回收NaOH，所以丝光废水一般很少排出，经过工艺多次重复使用最终排出的废水仍呈强碱性，BOD、COD、SS均较高。 Mercerizing wastewater: high alkali content, NaOH content at 3% ~ 3%, most of the dyeing by NaOH evaporation concentration and recovery, so rarely, mercerizing wastewater after process reuse of the wastewater at many times in strong alkaline, BOD, COD, SS were higher.