Reactive dyes requires large amounts of salt, dyeing raffinate high salt content, to bring the sewage treatment more difficult, the main factors affect the reactive dyes have a salt concentration, alkali concentration, temperature and dyeing bath ratio .
By dyeing process at a constant temperature condition, the normal water measured dyeing and dyeing residue, the pH of the dye, the depth of the dyed fabric Discussion consumption during reactive dyeing and dye base salts, for monochrome and reactive dyes Color-blocking dyestuff rehydration test .
The results showed that the amount of each dye staining reuse reduced by about 5% of the original amount, proportional to the amount of salt added water consumption, due to partial hydrolysis dye base of decreasing pH, with the need to back each supplemented with 5% of the total amount -10%, the production of large goods in the workshop verified the feasibility of the reuse of reactive dyes.
1. Status Analysis of Printing and Dyeing Plants
Printing and dyeing industry is one of the four national pollution remediation industry, network printing and dyeing industry in 2013 from the original COD emission standards of less than 500 ppm up to less than 200 ppm, some small dye houses bear this pressure does not limit the sewage and wastewater treatment costs and closed collapse, part of the dyeing business for rectification, spend large cost wastewater treatment engineering, reverse osmosis membranes and some supplement new processing techniques in water reuse and employment process, from the original cost of sewage treatment l yuan / ton to 6 yuan / ton. Dyeing method to solve this problem is through improved equipment, through the transformation process technology, by dyeing wastewater reuse, reduce, or not to produce printing and dyeing wastewater to achieve zero emission is the ultimate goal of our printing plants. In this paper, the repeated dyeing of residual dyes with reactive dyestuffs can achieve the goal of reducing the cost of sewage treatment and reducing the cost of additives and dyes without reconstructing the dyeing equipment. This will provide dye printing plants with a goal of reducing emissions and achieving near zero emissions. Ideas.
2 Research and Analysis of Repeated Reuse of Reactive Dyeing Residual Solution
2.1 Reactive dyeing raffinate repeated reuse method
Method one: Make a auxiliary tank with the same capacity as the dyeing machine next to or above the gap dyeing machine, and connect it with the dyeing machine through the pump. After the dyeing of the reactive dyes is finished, pump the residual liquid to the auxiliary cylinder and the original dyeing liquid. Than, the amount of residual liquid will be about 10% less (the exact amount can be obtained by testing). When the lower cylinder is used for dyeing , add 10% water and the corresponding Yuan Mingfen and soda ash in the auxiliary tank, put the residual liquid in the auxiliary tank back into the dyeing machine , and dye the second cylinder with the same dyeing process. Product, then repeat the above operation to use residual liquid to do the third, fourth, fifth... N-cylinder product dyeing.
Method 2: (patent of invention: ZL201210142739.7): Without auxiliary cylinders, connect N dyeing machines of the same capacity through a pump and prepare the N-Cylinder to dye the same product with the same color. After the first cylinder is dyed, remove the residue. The liquid pump is pumped into the second dyeing tank, and 10% water and the corresponding Yuanmingfen and soda are added to start the dyeing of the second cylinder product. After the dyeing is completed, the residual liquid is pumped into the third dyeing tank, and 10 is added. % of water and corresponding Yuan Mingfen and soda ash , began to dye the third cylinder product, repeat the above operation to use the residual liquid to do the fourth and fifth. . . The dyeing of the Nth cylinder product.
2.2 Advantages of the Reuse Technology of Reactive Dyeing Residues
In theory, as long as the same product is dyed, reactive dyeing residue can be repeated reuse it, truly zero emissions residual staining solution, but in fact generally can repeat back 4-5 times. According to the use of 5 times to analyze the advantages of this residual solution recycling technology , reuse 5 times , that is, dyeing 6 cylinder products, dyeing l00 kg product with black as an example, dyeing formula : active black 6%, Yuanmingfen 60g/ L, soda 25 g/L, calculated as bath ratio of 1:10, see Table 1 for comparison.
Table 1 Comparison of process prescriptions
Process prescription
Yuan Mingfen/kg
Soda Ash/kg
Dye amount/g
Water consumption/T
Pollutant/T
Normal staining
60
25
6
l
0.9
First time reuse
6
2.5
5.7
0.1
0
Second time reuse
6
2.5
5.7
0.1
0
Third time reuse
6
2.5
5.7
0.1
0
Fourth time reuse
6
2.5
5.7
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