title: [Flocculation of wastewater produced in polymer flooding].
abstract: The particle size distribution, flocculation index, Zeta potential and oil content in water were tested during flocculation of wastewater produced in polymer flooding of oil field. CHP-03, a mixture of a modified pluronic demulsifer and a weak-cationic flocculant, was used to improve the efficiency of oil droplet collision. The effects of polyacrylamide, temperature, and mixing speed on flocculation dynamics are discussed. Polyacrylamide affects the oil-water separation by obstructing the aggregation of small oil droplets, but electrostatic repulsion is not a major factor in preventing flocculation. The local temperature has a limited effect on flocculation. Fast mixing favors the growth of flocs, while slow mixing is suitable for the coalescence of oil droplets. Addition of 250 mg/L CHP-03 can enhance the oil-water separation and remove 92% of the oil content.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China. lulei@mail.sdu.edu.cn
authors.forename: Lei
authors.initials: L
authors.lastname: Lu
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Gao
authors.forename: Qin-Yan
authors.initials: QY
authors.lastname: Yue
authors.forename: Bai-Chuan
authors.initials: BC
authors.lastname: Cao
mesh_terms: D000180:Acrylic Resins / Q000032:analysis* / Q000737:chemistry; D005427:Flocculation; D005648:Fuel Oils / Q000032:analysis*; D010316:Particle Size; D011108:Polymers; D014873:Water Pollutants / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D005648:Fuel Oils; D011108:Polymers; D014873:Water Pollutants; D000099166:Polyacrylamides