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Reviewed the papers of oilfield wastewater treatment overview summarizes the general process and the advantages and disadvantages of the current domestic and international oilfield wastewater treatment technology , and domestic and international oilfield wastewater treatment technology trends and Coagulation , Fenton reagent oxidation processing the produced wastewater mechanism were analyzed and discussed . Oil production wastewater coagulation pretreatment using Fenton reagent oxidation treatment . Tested by univariate analysis , coagulation and Fenton reagent oxidation system factors and COD removal efficiency curve , coagulant types and dosage , flocculant types and dosage , pH , temperature , salt concentration , stirring speed and time of coagulation effect , at the same time studied the H 2 O 2 dosage Fe 2 < / sup> - enter the dosage , pH , reaction temperature , reaction time and other Fenton reagent oxidation treatment effect , and to explore the mechanism of action of each factor and laws . Through a pilot study to determine the operating conditions of the program and its process of oil extraction wastewater treatment . Processed in two steps : ( 1 ) coagulation ② Fenton oxidation . Which coagulation treatment conditions : PAC dosage of 25 mg / L, PAM dosage 0.25mg / L , pH 7 , a temperature of 50 ° C , the high-speed stirring speed 200r/min , high-speed mixing time is 60s, low-speed stirring speed 100r/min, low-speed mixing time 3min settlement time of 30 min . Fenton reagent oxidation treatment best operating conditions : [ H 2 O 2 < / sub > = 113 mg / L , [ Fe 2 ] = 111 mg of the / L, T = 60 ℃, pH = 4, the reaction time was 60 min . Coagulation and Fenton reagent oxidation treatment under optimal operating conditions , the oil concentration in the water decreased from 104.3mg / L to 1.4mg / L, COD concentration decreased from 548.7mg / L is 3.8 mg / L SS concentration 102.5mg / L decreased to 2.0mg / L, reached oilfield reinjection water quality standards . The economic analysis of oily wastewater treatment , paper coagulation pretreatment and Fenton Oxidation Process : Coagulation - Fenton reagent oxidation method for the economic and technical feasibility of oily wastewater biodegradable .
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