Broadening of appropriate demulsifier dosage range for latex-containing wastewater by sulfate addition

doi:10.1007/s11783-018-1041-z

Front. Environ. Sci. Eng.

2018, Vol. 12

Issue (6) : 4 https://doi.org/10.1007/s11783-018-1041-z

RESEARCH ARTICLE

Broadening of appropriate demulsifier dosage range for latex-containing wastewater by sulfate addition

Shengzhi Zheng^1,^2,³, Yudong Song^2,³(

), Yiming Li⁴, Lidong Sun⁴, Bin Hu⁴, Mingdong An⁴, Yuexi Zhou^2,³(

)

¹. College of Water Science, Beijing Normal University, Beijing 100875, China
². Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
³. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
⁴. Jilin Petrochemical Company, Ltd., PetroChina, Jilin 132022, China

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Abstract

The effect of latex concentration on appropriate demulsifier dosage was investigated.

The appropriate demulsifier dosage range was controlled by zeta potential.

Sulfate could broaden appropriate demulsifier dosage range and improve latex removal.

Investigation of demulsification of polybutadiene latex (PBL) wastewater by polyaluminum chloride (PAC) indicated that there was an appropriate dosage range for latex removal. The demulsification mechanism of PAC was adsorption-charge neutralization and its appropriate dosage range was controlled by zeta potential. When the zeta potential of the mixture was between -15 and 15 mV after adding PAC, the demulsification effect was good. Decreasing the latex concentration in chemical oxygen demand (COD) from 8.0 g/L to 0.2 g/L made the appropriate PAC dosage range narrower and caused the maximum latex removal efficiency to decrease from 95% to 37%. Therefore, more accurate PAC dosage control is required. Moreover, adding 50 mg/L sulfate broadened the appropriate PAC dosage range, resulting in an increase in maximum latex removal efficiency from 37% to 91% for wastewater of 0.2 g COD/L. The addition of sulfate will favor more flexible PAC dosage control in demulsification of PBL wastewater.

Keywords Demulsification Polybutadiene latex wastewater Polyaluminum chloride Zeta potential Sulfate addition

Corresponding Author(s): Yudong Song,Yuexi Zhou

Issue Date: 19 August 2018

Cite this article:

Shengzhi Zheng,Yudong Song,Yiming Li, et al. Broadening of appropriate demulsifier dosage range for latex-containing wastewater by sulfate addition[J]. Front. Environ. Sci. Eng., 2018, 12(6): 4.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-018-1041-z
https://academic.hep.com.cn/fese/EN/Y2018/V12/I6/4

Fig.1 COD (a) and turbidity (b) removal efficiency, zeta potential (c) and average particle size (d) of latex wastewater at different PAC dosages

Fig.2 Particle size distribution of PBL wastewater (initial COD concentration of 8.0 g/L) at different PAC dosages

Fig.3 Transmission electron microscopy of samples at different PAC dosages (a: no PAC dosage, zeta potential -61.6 mV; b: 10 mg PAC/g COD, zeta potential -4.2 mV; c: 25 mg PAC/g COD, zeta potential 38 mV)

Fig.4 Relationship between initial COD concentration and appropriate PAC dosage

Fig.5 Effects of zeta potential on turbidity and COD removal efficiencies in the PBL wastewater

Fig.6 Influence of 50 mg/L sulfate on PAC demulsification effects: (a) 8.0 g COD/L and (b) 0.2 g COD/L

Fig.7 Mechanism of PAC and sulfate addition to PBL wastewater

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