Journal
ENVIRONMENTAL TECHNOLOGY
Volume 42, Issue 11, Pages 1715-1722Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2019.1677785
Keywords
Wastewater produced from polymer flooding; flocculant; copolymer; flocculation mechanism; interface
Categories
Funding
- National Science and Technology Major Project Sub-project of China [2016ZX05025-003-003]
- National Natural Science Foundation of China [21607174, 51974267]
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The preparation of a novel flocculant, PDC12DM, for treating oily wastewater from polymer flooding is a meaningful work. The optimized PDC12DM showed a high oil removal rate and a significant decrease in viscous floc production compared to commercial flocculant, with its mechanism involving electrostatic charge neutralization and demulsification for oil droplet destabilization.
Preparation of a flocculant which can have high-oil removal and no viscous flocs production for treating oily wastewater produced from polymer flooding (OWPF) is meaningful work. In this paper, a novel flocculant (denoted as PDC12DM) for treating OWPF was prepared by copolymerization of dodecyl dimethylallyl ammonium chloride (C12DM) and dimethyl aminopropyl methacryamide (DMAPMA). By using oil removal and viscous floc production as indexes, the synthesis condition of PDC12DM was optimized. The optimum PDC12DM had an oil removal of 98.8% and a viscous floc production decrease of 62.86% compared with commercial cationic flocculant. Measurement of zeta potential, surface tension, interfacial tension, interfacial film strength and dual polarization interferometry tests were carried out for investigating the flocculation mechanism of PDC12DM. The results showed that PDC12DM can destroy oil droplet stability by electrostatic charge neutralization and demulsification together. Especially, demulsification mechanism is helpful for reducing the viscous floc.
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