Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 121-128.doi: 10.13475/j.fzxb.20201202008

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Synthesis and decolorizing performance of modified flocculant for treating dyeing wastewater

GAO Luxi, LÜ Xuechuan, ZHANG Chi, SONG Hanlin, GAO Xiaohan()   

  1. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
  • Received:2020-12-08 Revised:2022-04-13 Online:2022-07-15 Published:2022-07-29
  • Contact: GAO Xiaohan E-mail:gaoxhan@163.com

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Abstract:

To improve the decolorizing performance of epichlorohydrin and polyamine flocculants, the modified epichlorohydrin-dimethylamine decolorizing flocculant was prepared using diethylenetriamine as the cross-linking agent and epichlorohydrin and dimethylamine as raw materials. Its flocculating performance was studied through the flocculation experiment by using Reactive Brilliant Red X-3B as the simulated dyeing wastewater. Effects of material molar ratio, reaction temperature, water temperature, pH value, concentration of dyes and dosage of modified flocculant on the performance of the decolorant were studied. Mixed usage with polyacrylamide was also investigated. The optimized conditions to prepare the modified flocculant are that the molar ratio of epichlorohydrin to dimethylamine to diethylenetriamine is 1:0.95:0.05 and reaction temperature is 90 ℃. The optimized conditions of flocculating decolorization are that water temperature is 20 ℃, pH value is 4, concentration of dyes is 200 mg/L, and modified flocculant dosage is 125 mg/L. Under the optimized conditions of flocculating decolorization, the modified flocculant was used, achieving 91.0% color removal. The results indicate that the modified decolorizing flocculant shows a better performance than the unmodified decolorizing flocculant. The modifier improves the charge neutralization and bridging-netting function of the modified flocculant. Decolorization performance and salt tolerance of the modified flocculant are improved due to the mixed usage with polyacrylamide.

Key words: flocculant, epichlorohydrin, dimethylamine, diethylenetriamine, mixed usage, decolorizing performance, dyeing wastewater, wastewater treatment

CLC Number: 

  • X703

Fig.1

Structure of modified decolorizing flocculant"

Fig.2

Structure of unmodified decolorizing flocculant"

"

二甲胺与环氧
氯丙烷的量比		 脱色率/% 二甲胺与环氧
氯丙烷的量比		 脱色率/%
0.85:1 70.4 0.96:1 80.9
0.90:1 75.5 0.98:1 78.9
0.93:1 80.6 1.00:1 74.9
0.95:1 82.3

Tab.2

Influence of molar ratio of diethylenetriamine to epichlorohydrin on decolorization performance of modified decolorizing flocculant"

二乙烯三胺与环氧
氯丙烷的量比		 脱色
率/%		 二乙烯三胺与环氧
氯丙烷的量比		 脱色
率/%
0.01:1 57.4 0.06:1 76.1
0.03:1 75.2 0.07:1 56.3
0.04:1 79.1 0.09:1 38.0
0.05:1 82.3 0.13:1 27.0

Fig.3

Influence of reaction temperature on decolorization performance of modified decolorizing flocculant"

Fig.4

Decolorization rate of two kinds of flocculants in different reaction time"

Tab.3

Factors and level of orthogonal flocculation experiment"

水平 快搅速率/
(r·min-1)		 快搅时间/min 慢搅速率/
(r·min-1)		 慢搅时间/min
1 300 1.5 25 0.5
2 350 2.0 50 1.0
3 400 2.5 75 1.5

Tab.4

Results of orthogonal flocculation experiment"

试验号 因素 脱色率/%
快搅速率 快搅时间 慢搅速率 慢搅时间
1 1 1 1 1 82.3
2 1 2 2 2 82.1
3 1 3 3 3 80.1
4 2 1 2 3 81.4
5 2 2 3 1 81.0
6 2 3 1 2 80.7
7 3 1 3 2 82.2
8 3 2 1 3 74.0
9 3 3 2 1 81.5
K1 81.5 82.0 79.0 81.6
K2 81.0 79.0 81.7 81.7
K3 79.2 80.8 81.1 78.5
R 6.8 8.8 8 9.5

Fig.5

Influence of water temperature on decolorization performance of modified decolorizing flocculant"

Fig.6

Influence of dye and flucculant concentration on decolorization performance of modified decolorizing flocculant"

Fig.7

Influence of pH value on decolorization performance of modified decolorizing flocculant"

Fig.8

Mixed usage of modified decolorizing flocculant with four kinds of PAM"

Fig.9

Influence of NaCl on decolorization performance of modified decolorizing flocculant"

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