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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