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Evaluation of new hydrophobic association inorganic composite material as coagulant for oilfield wastewater treatment
- Source :
- Separation and Purification Technology. 275:119126
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The use of oil recovery technologies has resulted in the weakening of interfacial tension between oil and water in oilfield wastewater due to a large amount of polymer present. This leads to the formation of stable emulsified colloidal systems and increases the difficulty of oilfield wastewater treatment. This study investigated hydrophobically-modified polyaluminium silicate sulphate (PASS-C) as a coagulant for oilfield wastewater treatment. PASS-C was prepared by the condensation polymerisation of Al2(SO4)3·18H2O with dialysed and hydrolysed KH570 [3-(trimethoxysilyl)propyl methacrylate] under titration with NaAlO2 and water glass at low temperature. The zeta potential of PASS-C showed that the introduction of hydrophobic groups increased its charge neutralisation ability. Additionally, compared with conventional PASS, PASS-C showed a satisfactory oil removal rate from simulated polymer flooding oily wastewater. When the hydrophobic group content was 1% and the dosage of PASS-C was 140 mg·L–1, the optimal oil removal rate and turbidity removal rate was 95% and 98%, respectively. The particle size and morphology of the coagulated flocs were characterised by laser particle size analysis and SEM. Compared with PASS, PASS-C formed a larger and more compact floc. These findings indicated that the good flocculability of PASS-C for crude oil wastewater was attributable to the synergistic effects of charge neutralisation, hydrophobic associations and adsorption bridging.
- Subjects :
- Chemistry
Filtration and Separation
02 engineering and technology
021001 nanoscience & nanotechnology
Analytical Chemistry
Colloid
Adsorption
020401 chemical engineering
Chemical engineering
Wastewater
Zeta potential
Sewage treatment
Titration
Particle size
0204 chemical engineering
Turbidity
0210 nano-technology
Subjects
Details
- ISSN :
- 13835866
- Volume :
- 275
- Database :
- OpenAIRE
- Journal :
- Separation and Purification Technology
- Accession number :
- edsair.doi...........4f41627f8bd9d18a0f56319938984313