Hazards of Textile Wastewater

　The following is an introduction to the hazards of textile wastewater by Zhongyi editor:

　　The wastewater generated by textile processing contains various pollutants. If the wastewater is discharged directly into rivers, lakes and seas without treatment, it will cause serious pollution to the natural environment and pose a serious threat to human survival.

　　(1) Pollution of natural water bodies such as rivers When textile wastewater is discharged into natural water bodies, the large amount of organic matter contained in it will quickly consume the dissolved oxygen in the water under the action of aerobic microorganisms, causing hypoxia in the water, seriously endangering the survival of freshwater fish and other aquatic organisms. At the same time, it will cause the death of microorganisms that require oxygen, destroying the diversity of water environment management organisms; and it is precisely because these microorganisms can decompose organic matter that they maintain the purification capacity of rivers and streams. The consequences are that rivers and streams become black, smelly, toxins accumulate, and harm people and animals.

　　(2) Pollution of farmland When textile wastewater is used to irrigate farmland, due to its high alkalinity, it will cause soil salinization and seriously hinder the growth of crops. Moreover, once the soil is completely alkaline, it is no longer suitable for growing crops. Suspended matter in wastewater will block soil pores, hinder the respiration of crop roots, and affect crop growth. The optimum growth temperature for crops and soil microorganisms is 20-25°C, but sometimes the temperature of wastewater can be as high as 30-40°C, which will also have adverse effects on crops and soil microorganisms. Toxic substances in wastewater will continue to accumulate in the roots, stems and fruits of crops. In addition, it will also pollute groundwater.

　　(3) Impact on urban sewage treatment General textile wastewater can be directly discharged into the city sewer and enter the urban sewage treatment plant together with urban sewage for unified treatment. However, for desizing wastewater with high concentration, wastewater containing aniline or sulfur dyes, its concentration must be controlled, otherwise it will be detrimental to the biochemical treatment of sewage treatment plants. Wastewater containing sulfur dyes has a corrosive effect on concrete pipes, and acid-base wastewater also has a certain corrosive effect on urban underground drainage pipes.