Dyeing reclaimed water recycling process and equipment

Abstract

The invention discloses dyeing reclaimed water recycling process and equipment in a dyeing industry. With dyeing waste water subjected to secondary pretreatment as a water source, process water for dyeing production is obtained through biochemical materialized pretreatment and reverse osmotic treatment. With reverse osmotic device desalination as a center and multi-phase pump dissolving vapor, biological filtration, flocculating filtration, active carbon filtration and ion exchange as pretreatment, the invention effectively ensures quality of water and the service life of the equipment. The invention provides the follow-up reclaimed water recycling process and equipment for waste water treatment of the dyeing industry, and produced water is used as process water for dyeing production. The invention has the advantage of reasonable process design and simple and stable for operating, and a water discharged index can meet the water standard of the dyeing industry. The process performs active effects on aspects for saving water resource, saving energy, reducing emission, reducing operation cost and the like.

Description

technical field [0001] The invention relates to a process and equipment for recycling water in printing and dyeing, and belongs to the technical field of water recycling in printing and dyeing wastewater. Background technique [0002] China's light and textile industry is highly developed, and the printing and dyeing industry has developed rapidly. The water consumption is large, but the effluent can only be discharged into the water body or brought into the urban sewage treatment plant after secondary treatment. Due to the serious shortage of water resources, sewage as a special kind of water Resources have begun to be valued by people, but in the existing printing and dyeing wastewater reuse technology, reverse osmosis treatment method is used to reuse the printing and dyeing wastewater, which has strict requirements on the quality of the influent water. It is known from practical experience and test data , unqualified reverse osmosis treatment will lead to fouling of memb...

AI Technical Summary

Problems solved by technology

[0002] China's light and textile industry is highly developed, and the printing and dyeing industry has developed rapidly. The water consumption is large, but the effluent can only be discharged into the water body or brought into the urban sewage treatment plant after secondary treatment. Due to the serious shortage of water resources, sewage as a special kind of water Resources have begun to be valued by people, but in the existing printing and dyeing wastewater reuse technology, reverse osmosis treatment method is used to reuse the printing and dyeing wastewater, which has strict requirements on the quality of the influent water. It is known from practical experience and test data , unqualified reverse osmosis treatment will lead to fouling of membrane elements, resulting in poor water quality and frequent cleaning. Therefore, strict pretreatment of raw water is required to remove organic matter, suspended matter, colloid, inorganic matter and other pollutants; currently printing and dyeing After secondary treatment, the effluent from the secondary settling tank still has certain chromaticity, organic matter, suspended solids, colloids, metal ions and microorganisms, and the effluent has high conductivity and high salt content; To meet the requirements of printing and dyeing process water, it can only be used for watering greenery, flushing toilets and grounds. Now, ultrafiltration has a high engineering investment as a direct pretreatment. At the same time, due to the variability of printing and dyeing wastewater quality, the ultrafiltration membrane is stable. Poor performance, so that the impact load of the reverse osmosis treatment system is relatively high

Images