Textile pretreatment special wastewater regeneration recycling system

Abstract

The invention discloses a textile pretreatment special wastewater regeneration recycling system which comprises a pretreatment device, and the pretreatment device is sequentially connected with a first solid-liquid separator, a heat energy exchanger, a cooler, an acid titration tank and a second solid-liquid separator. Wastewater treated by a physical system is free of heavy metal ions, calcium and magnesium ions and PTA organic matters, low in turbidity, low in water hardness and weakly alkaline, completely meets the application standard of textile printing and dyeing water, and can be recycled; through treatment of the system, liquid and solid waste are separated, the solid waste is recycled and comprehensively utilized, and the liquid does not contain a large amount of complexes, chelate and PTA and can be recycled for a long time; and in addition, the system can also displace heat in the wastewater and recycle heat energy, so that long-time cyclic utilization of liquid and heat energy in the pretreated wastewater is completely realized, green production is achieved, and sustainable development of the whole industry is realized.

Description

technical field [0001] The invention belongs to the technical field of waste water recycling, in particular to a textile pretreatment special waste water regeneration and recycling system. Background technique [0002] In the entire printing and dyeing production process of textiles, including pretreatment, dyeing, printing, and finishing processes, among them, the pretreatment process is the most important and the basis of subsequent processes. In the traditional pretreatment process, pretreatment chemicals are used to treat textiles. After the pretreatment process, a large amount of wastewater is generated. There are three major problems in the direct reuse of pretreatment wastewater: [0003] 1. There are a large number of metal ions, and the heavy metal ions that cannot be fully complexed will cause oxidative damage to the cloth surface in the subsequent wastewater utilization. For example, the fiber will burn when it encounters heavy metal ions after adding hydrogen per...

AI Technical Summary

Problems solved by technology

[0003] 1. There are a large number of metal ions, and the heavy metal ions that cannot be fully complexed will cause oxidative damage to the cloth surface in the subsequent wastewater utilization. For example, the fiber will burn when it encounters heavy metal ions after adding hydrogen peroxide under alkaline conditions, and the calcium that cannot be integrated Magnesium ions will make the wastewater hard water and cause damage to the cloth surface;

[0004] 2. There is a large amount of lignin and macromolecules of various substances, which makes the turbidity of the wastewater higher, and secondary pollution will occur during the reuse of wastewater;

[0005] 3. There is a large amount of organic matter, such as PET and PTA. Among them, PET continues to fall off to produce PTA. During the reuse of wastewater, it will polymerize and reverse stickiness, causing dyeing quality problems

After long-term research, it is found that the pretreatment chemicals in the traditional pretreatment process can be replaced by bugong tea saponin, which basically solves the above problems, but there are a large number of complexes, chelates and PTA in the wastewater so that it cannot be circulated for a long time Utilization, and the heat in the waste water is easy to be wasted

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