Effect of latex concentration in ABS resin wastewater on demulsification

doi:10.11949/j.issn.0438-1157.20160649

Abstract

Abstract:

The effect of latex concentration in ABS resin emulsion graft section wastewater on demulsification efficiency was investigated with PAC as demulsifier. The results indicated that there were optimized ranges of reagent dosage in different latex concentrations, as the undersize or oversize dosages could all lead to poor demulsification efficiency. When the latex COD concentration decreased from 13012 mg·L^-1 to 192 mg·L^-1, the optimized ranges of reagent dosage moved right, increasing from 6.1-10.8 mg·g^-1 to 7.7-13.8 mg·g^-1. The optimum COD removal efficiencies dropped from 99.30% to 91.24%. The optimum reagent dosages per latex COD unit increased by about 40%. The demulsification mechanism of latex wastewater by PAC was mainly adsorption-charge neutralization. With increase of PAC dosage, the colloid Zeta potential increased, and the latex could realize demulsification effectively in the range of -23-13 mV.

Key words: latex wastewater, demulsification, concentration, dosage, polymers, colloid, emulsions

摘要：

以ABS树脂接枝聚合工段废水为研究对象，聚合氯化铝（PAC）为破乳剂，考察了胶乳浓度对破乳效果的影响。结果表明，不同胶乳浓度下均存在优化的药剂投加量区间，投加量过小或过大均会造成破乳效果不佳。随着胶乳COD浓度由13012 mg·L^-1下降至192 mg·L^-1，单位胶乳COD的优化药剂投加量由6.1~10.8 mg·g^-1增加至7.7~13.8 mg·g^-1，区间向右移动，最佳COD去除率由99.30%下降至91.24%。稀释前后最优单位胶乳COD的药剂投加量提高了40%左右。PAC对ABS树脂废水胶乳的破乳机理以吸附-电性中和为主，随着PAC投加量的增加，胶粒Zeta电位逐渐升高，Zeta电位在-23~13 mV范围内，胶乳可有效破乳。

关键词: 胶乳废水, 破乳, 浓度, 投加量, 聚合物, 胶体, 乳液

CLC Number:

X783.2

LUO Meng, SONG Yudong, ZHENG Shengzhi, ZHOU Yuexi, HE Xuwen. Effect of latex concentration in ABS resin wastewater on demulsification[J]. CIESC Journal, 2016, 67(11): 4837-4842.

罗梦, 宋玉栋, 郑盛之, 周岳溪, 何绪文. ABS树脂废水胶乳浓度对破乳的影响[J]. 化工学报, 2016, 67(11): 4837-4842.

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