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Study on Flocculation Technology of Oily Wastewater Produced from Polymer Flooding

Author: WangYuZuo
Tutor: LiuLiXin
School: Daqing Petroleum Institute
Course: Chemical processes
Keywords: Polymer flooding sewage Flocculation The role of the law Inorganic compound flocculant Electroflocculation
CLC: X741
Type: Master's thesis
Year: 2008
Downloads: 177
Quote: 3
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Abstract


Currently, the major key oilfields in China have already been implemented in polymer flooding technology. Polymer flooding in enhanced oil recovery at the same time also makes mining liquid polymer (partially hydrolyzed polyacrylamide HPAM) residues increases mined sewage viscosity increase, oil-water separator slowed original sewage The decline in processing capacity. The purpose of this paper is to study the the flocculation law flocculant polymer flooding (polymer flooding) sewage develop new flocculant, savings in the amount of flocculant and break the conventional approach, cost-effective processing of polymer flooding sewage. The article first starting from the polymer flooding sewage water, selection of commonly used flocculant flocculation study the role of sewage law through a mixed and complex means to improve the treated supernatant, and then based on the the flocculant molecular structure and the advantages and disadvantages of transmittance. Then, the evaluation of flocculation effect, major evaluation indicators flocculation treatment of residual supernatant HPAM mass concentration, oil content, chemical oxygen demand and the relative viscosity and floc morphology, in which the concentration of residual HPAM quality investigated as the focus. The study results show that by appropriate choice of inorganic and organic flocculants in the optimal dosage and flocculation temperature treatment after four indicators content decreased significantly better flocculation. According to the the floc morphology flocculant relationship of the molecular structure and the effect of flocculant, synthetic inorganic polymer composite flocculant polysilicate PAFC (PAFSC), the optimal synthesis conditions: Preparation of polysilicate The silica concentration of 2.5%, a pH value of 5.0. Preparation PAFSC ferroaluminum molar ratio of 2:1, ferroaluminum amount of substance and silicon molar ratio of 1:1, the reaction temperature is room temperature. The the flocculant PAFSC and poly dimethyl diallyl ammonium chloride (PDADMAC) mixed quality and of aluminum and iron with PDADMAC mass ratio of 40:1, flocculation temperature of 37 ° C, plus a dose of 150 mg / L When polymer flooding sewage treatment allows light transmission rate of 98.5%. Finally, Pharmacy and cost savings, environmental protection, on the basis of chemical flocculation to study the electrochemical flocculation and conducted a joint study of the electrochemical flocculation and chemical flocculation. Electrochemical flocculation optimal experimental conditions by orthogonal experiments: the electrode plate spacing 9 mm, the electrolytic time for 16min, current density 1000A/m2. Electrochemical flocculation and flocculant PAC joint processing of polymer flooding sewage the PAC dose can save nearly 700 mg / L, the supernatant transmittance of 99%. Electrochemical flocculation and flocculant the CPAM joint processing of polymer flooding sewage, the dose of the CPAM can save nearly 200mg / L, the supernatant was light transmission rate of 98.6%.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Oil, gas, industrial waste treatment and comprehensive utilization > Oil and gas fields
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