Humic Acid Removal from Water with PAC-Al30 : Effect of Calcium and Kaolin and the Action Mechanisms

ACS Omega
Zhen WuPan-Yue Zhang

Abstract

Polyaluminum chloride with a dominant species of Al30 (PAC-Al30) was prepared in laboratory and used for humic acid (HA) removal from water. The action properties and mechanisms of PAC-Al30, HA, calcium, and kaolin were tested and discussed. The results showed that the existence of calcium or kaolin contributed to the HA removal when the PAC-Al30 dosage was deficient and had no obvious effect when the amount of PAC-Al30 was sufficient. When the PAC-Al30 dosage was 0.01 and 0.02 mmol/L, the HA removal rate was increased by 66.59 and 42.20%, respectively, with a calcium concentration of 2.0 mmol/L, or increased by 53.31 and 40.92%, respectively, with the kaolin particle concentration of 150 mg/L. Calcium could compress the double electrical layers or complex with HA to neutralize a part of the surface negative charge of HA, but could not make the water system reach its isoelectric point. The mechanisms of calcium and kaolin's promoting coagulation effect were adsorption neutralization and collision aggregation respectively, but these actions were much weaker than that of PAC-Al30 with HA. The adsorption neutralization capacity of PAC-Al30 was calculated to be nearly 60 times than that of calcium, and the higher γ value of calcium...Continue Reading

References

Aug 23, 2007·Environmental Science & Technology·Wassana YantaseeMarvin G Warner
Sep 25, 2017·Environmental Science & Technology·Christina C Davis, Marc Edwards
Jun 3, 2018·The Science of the Total Environment·Chuanliang ZhaoYanyan An
Apr 7, 2019·Journal of Environmental Sciences (China)·Libing LiuDongsheng Wang

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