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印染废水处理各工序的排水情况
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 wastewater: The amount of water is small, but the concentration of pollutants is high, which contains various sizes, slurry decomposition products, fiber chips, starch alkali and various additives. The wastewater is alkaline and the pH value is about 12. The COD and BOD values of starch-based desizing wastewater (e.g. cotton cloth) are very high and biodegradability is good. The desizing wastewater of polyvinyl alcohol (PVA) based sizing (e.g. polyester-cotton warp yarn) has high COD and low BOD, and the biodegradability of wastewater is poor.
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。
Boiling wastewater: large amount of water, high concentration of pollutants, including cellulose, fruit acid, wax, grease, alkali, surfactant, nitrogen compounds, etc., wastewater is strong alkaline, water temperature is high, brown.
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 wastewater: The amount of water is large, but the pollution is light. It contains residual bleaching agent, a small amount of acetic acid, oxalic acid, sodium thiosulfate and so on.
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 in 3%-5%. Most printing and dyeing plants recover NaOH by evaporation and concentration, so mercerizing wastewater is seldom discharged. After repeated use, the final discharged wastewater is still strong alkaline, BOD, COD, SS are higher.
染色废水：水量较大，水质随所用染料的不同而不同，其中含浆料、染料、助剂、表面活性剂等，一般呈强碱性，色度很高，COD较BOD高得多，可生化性较差。
Dyeing wastewater: The amount of water is large, and the quality of water varies with the dyes used. Among them, slurries, dyes, auxiliaries, surfactants, etc., are generally strong alkaline, with high chroma. COD is much higher than BOD, and biodegradability is poor.
印花废水：水量较大，除印花过程的废水外，还包括印花后的皂洗、水洗废水，污染物浓度较高，其中含有浆料、染料、助剂等，BOD、COD均较高。
Printing wastewater: large amount of water, in addition to printing process wastewater, including soaping and washing wastewater after printing, high concentration of pollutants, including sizes, dyes, auxiliaries, BOD, COD are higher.
整理废水：水量较小，其中含有纤维屑、树脂、油剂、浆料等。
Finishing wastewater: small amount of water, which contains fiber chips, resins, oil agents, slurry and so on.
碱减量废水：是涤纶仿真丝碱减量工序产生的，主要含涤纶水解物对苯二甲酸、乙二醇等，其中对苯二甲酸含量高达75%。碱减量废水不仅pH值高(一般＞12)，而且有机物浓度高，碱减量工序排放的废水中CODCr可高达9万mg/L，高分子有机物及部分染料很难被生物降解，此种废水属高浓度难降解有机废水。
Alkali deweighting wastewater: It is produced by alkali deweighting process of polyester silk imitation. It mainly contains terephthalic acid, ethylene glycol, etc. The content of terephthalic acid is up to 75%. Alkali reduction wastewater not only has a high pH value (generally > 12), but also has a high concentration of organic matter. CODCr in the wastewater discharged from the alkali reduction process can reach as high as 90,000 mg/L. Polymer organic matter and some dyes are difficult to be biodegraded. This wastewater belongs to high concentration and refractory organic wastewater.
Desizing wastewater: The amount of water is small, but the concentration of pollutants is high, which contains various sizes, slurry decomposition products, fiber chips, starch alkali and various additives. The wastewater is alkaline and the pH value is about 12. The COD and BOD values of starch-based desizing wastewater (e.g. cotton cloth) are very high and biodegradability is good. The desizing wastewater of polyvinyl alcohol (PVA) based sizing (e.g. polyester-cotton warp yarn) has high COD and low BOD, and the biodegradability of wastewater is poor.
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。
Boiling wastewater: large amount of water, high concentration of pollutants, including cellulose, fruit acid, wax, grease, alkali, surfactant, nitrogen compounds, etc., wastewater is strong alkaline, water temperature is high, brown.
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 wastewater: The amount of water is large, but the pollution is light. It contains residual bleaching agent, a small amount of acetic acid, oxalic acid, sodium thiosulfate and so on.
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 in 3%-5%. Most printing and dyeing plants recover NaOH by evaporation and concentration, so mercerizing wastewater is seldom discharged. After repeated use, the final discharged wastewater is still strong alkaline, BOD, COD, SS are higher.
染色废水：水量较大，水质随所用染料的不同而不同，其中含浆料、染料、助剂、表面活性剂等，一般呈强碱性，色度很高，COD较BOD高得多，可生化性较差。
Dyeing wastewater: The amount of water is large, and the quality of water varies with the dyes used. Among them, slurries, dyes, auxiliaries, surfactants, etc., are generally strong alkaline, with high chroma. COD is much higher than BOD, and biodegradability is poor.
印花废水：水量较大，除印花过程的废水外，还包括印花后的皂洗、水洗废水，污染物浓度较高，其中含有浆料、染料、助剂等，BOD、COD均较高。
Printing wastewater: large amount of water, in addition to printing process wastewater, including soaping and washing wastewater after printing, high concentration of pollutants, including sizes, dyes, auxiliaries, BOD, COD are higher.
整理废水：水量较小，其中含有纤维屑、树脂、油剂、浆料等。
Finishing wastewater: small amount of water, which contains fiber chips, resins, oil agents, slurry and so on.
碱减量废水：是涤纶仿真丝碱减量工序产生的，主要含涤纶水解物对苯二甲酸、乙二醇等，其中对苯二甲酸含量高达75%。碱减量废水不仅pH值高(一般＞12)，而且有机物浓度高，碱减量工序排放的废水中CODCr可高达9万mg/L，高分子有机物及部分染料很难被生物降解，此种废水属高浓度难降解有机废水。
Alkali deweighting wastewater: It is produced by alkali deweighting process of polyester silk imitation. It mainly contains terephthalic acid, ethylene glycol, etc. The content of terephthalic acid is up to 75%. Alkali reduction wastewater not only has a high pH value (generally > 12), but also has a high concentration of organic matter. CODCr in the wastewater discharged from the alkali reduction process can reach as high as 90,000 mg/L. Polymer organic matter and some dyes are difficult to be biodegraded. This wastewater belongs to high concentration and refractory organic wastewater.