The impurities contained in the fibers or fabrics are mainly the impurities contained in the fibers themselves and the auxiliaries or contaminants that need to be added during the textile processing. In fiber materials, natural fibers contain the most impurities. Raw cotton contains about 10% of the total weight of fibers, mainly waxy, pectin substances, cottonseed husks, etc.; raw wool contains more than 50% impurities, mainly sand, grass shoulders, lanolin, etc.; silk contains impurities about 20 More than %, mainly sericin; raw hemp impurities are also more than 20% on average; chemical fiber itself contains less impurities, but in the production process to add spin oil additives and other additives, there is also a certain amount of impurities. The impurities contained on the fibers are removed by pretreatment during the dyeing and finishing process, and are discharged into human waste water. This part of wastewater accounts for 50% to 60% of the total dyeing and finishing wastewater, with high pollutant content and relatively low chroma.
Additives in textile processing, mainly oil and slurry. Oils include mineral oils, emulsifiers, lubricants, and antistatic agents; slurries include starch pastes, modified starch pastes, and polyvinyl alcohols, polyacrylates, polyacrylamides, and synthetic syrups. Due to the increase of chemical fiber, the warp sizing used more modified starch paste and polyvinyl alcohol (PVA) mixed pulp. (PVA) is a kind of material that is difficult to biodegrade and reduces the biodegradability of wastewater.
In addition, the polyester alkali reduction process wastewater contains a relatively high concentration of polyester hydrolysate, a pair of organic substances such as phthalic acid, which are more difficult to biodegrade. The COD value of the wastewater is as high as 10,000 mg/L, and the alkalinity is also high. It is difficult to deal with printing and dyeing wastewater.
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Additives in textile processing, mainly oil and slurry. Oils include mineral oils, emulsifiers, lubricants, and antistatic agents; slurries include starch pastes, modified starch pastes, and polyvinyl alcohols, polyacrylates, polyacrylamides, and synthetic syrups. Due to the increase of chemical fiber, the warp sizing used more modified starch paste and polyvinyl alcohol (PVA) mixed pulp. (PVA) is a kind of material that is difficult to biodegrade and reduces the biodegradability of wastewater.
In addition, the polyester alkali reduction process wastewater contains a relatively high concentration of polyester hydrolysate, a pair of organic substances such as phthalic acid, which are more difficult to biodegrade. The COD value of the wastewater is as high as 10,000 mg/L, and the alkalinity is also high. It is difficult to deal with printing and dyeing wastewater.
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