- Pollution of organic matter is mainly characterized by COD and BOD values. It is worth noting that the more synthetic fibers are used, the more complete the treatment is, the more organic matter that belongs to the COD group will be used, meaning the harder it will be for chemicals and dyes to decompose. much. For example, wastewater from the use of reactive dyes (for example, Cibarcon Blue P-3R) for flower printing may have a BOD of approximately 0, but COD reaches approximately 900 mg / L. The COD / BOD ratio on the one hand represents the organic pollution characteristic of textile dyeing wastewater, and also shows the feasibility of microbiological technology in the later treatment stage.
- The third characteristic of textile wastewater is heavy metal pollution mainly due to the use of chemical detergents and dyes in the form of metal compounds. One of the sources of metal pollution is pigment, which is currently the most commonly used pigment based on halogenated metal-based metal compounds (eg copper loxiamine phosphate chloride).
- High conductivity or high total dissolved solids (TDS) are also characteristic of textile wastewater due to the use of fairly large soluble salts, for example Na2SO4, NaCl.
- Another characteristic of textile wastewater is dyeing and printing. Color pollution depends on the degree of color bonding between dyes and textile fibers.