Solvent extraction recovery chemical textile printing and dyeing wastewater treatment
A, textile industrial waste water sources of textile industry including cotton, wool, linen, silk, knitting, printing and dyeing, clothing, chemical fiber, textile machinery, and other type of work.
Textile industrial wastewater is: the eduction in textile industry production process of waste water.
In the textile industry wastewater, quantity and severe pollution mainly printing and dyeing wastewater and chemical fiber (
Especially the viscose fiber and polyester fiber of emulation silk, polyester, island)
Some industries such as cotton textile industry pollutants is given priority to with dust, waste water is mainly starch wastewater, followed by sewage sludge water jet loom, air conditioning, displacement small water and chemical fiber wastewater from printing and dyeing degree, and more clean.
2, the classification of the textile industry wastewater although textile industrial wastewater can be divided by industry more than 10 species, but only consider sizing mill wastewater before wastewater recycling and governance, air conditioning water recycle, textile industrial wastewater can be divided into four categories.
Cotton textile factory wastewater: sizing, air conditioning water mainly consider the recycling process.
water jet loom wastewater COD is in commonly 200 ~ 300 mg/f.
L, although pollution to a lesser degree, but it must be to deal with.
Dyeing wastewater, dyeing wastewater including pretreatment, dyeing, printing, finishing wastewater.
In addition, dyeing wastewater including number is string cable belt, wipes are manufacturing such as dyeing wastewater.
Chemical industrial wastewater: polyester, polyamide, ammonia, acrylic, whalen wastewater are collectively referred to as chemical fiber industrial wastewater.
Scouring the scrap and ramie degumming wastewater: hair factory of wool washing wastewater and ramie textile mill of ramie degumming wastewater are high concentration organic wastewater.
In nature, and wool dyeing wastewater treatment method and flax dyeing wastewater has the very big difference, must consider the resources recycling and clean production process, reduce the burden of wastewater treatment.
3, (1) the characteristics of textile industry wastewater quantity is big.
No matter from 単 product displacement or the industry total drainage.
2) is given priority to with organic pollution.
There are a few water is high concentration organic wastewater.
3. The pollutants in wastewater is mainly slurry, dye, additives, as well as the various chemical substances added in the finishing process, the second category of hazardous substances (
Refers to the long-term impact is less than the first kind of pollutants)
As for can in the environment and accumulate in the body of plants and animals, have long-term implications for health substances (
The first kind of pollutants)
Hexavalent chromium in textile industry waste water, but the quantity is less, generally after processing to achieve the emission standards.
4. Most of the alkaline wastewater, colour and lustre is deep, especially dyeing wastewater, and varies with the dye color.
4, textile industrial wastewater recycling technology according to the characteristics of the textile printing and dyeing industry, printing and dyeing wastewater treatment, should be used as far as possible repeat recycling and comprehensive utilization measures, combined with a reform of textile printing and dyeing production process, reduce the dosage of the thermonatrite, and other auxiliaries, dyes in wastewater, paddle material recycling, so we adopt solvent extraction recovery of printing and dyeing wastewater of textile industry.
Through the above these production technology innovation, can effectively reduce the emissions of textile printing and dyeing industry.
At the same time also save a lot of raw materials for manufacturing enterprise, increase the economic benefits of enterprises.