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Waste emulsion from machining and metal surface treatment process emissions , but due to the high concentration of pollutants in oil , nitrite , COD , improper handling will cause serious pollution . In this study, in the laboratory using a small device to take co - coagulation flotation , suspended activated carbon, biological contact oxidation , the precipitate was filtered series of adsorption combined process for processing the waste emulsion . Co-coagulation flotation reaction process : the use the beaker experiment to determine the optimal dosage : raw water suitable dosage of PAC 3 g / L , the the PAM dosage is 0.03 g / L , pH value of 8.5 , the gas-water ratio in about 8 % to 9% , the control dissolved air pressure in the 0.35 to 0.40 MPa . When the influent COD was 2.2 × 10 ~ 4 mg / L, SS 1716 mg / L , the effluent COD to 3520 mg / L , SS 189 mg / L , COD removal efficiency of 84.00 % , the SS removal rate 88.98 % . The suspension of activated carbon reaction process : This link is the use of activated carbon adsorption performance and survival of the dual function of the vector can be used as the microorganism , for further treatment of the effluent in the Coagulation . Activated carbon granular activated carbon in the reactor , the particle size of 3 mm . After experimentally determined residence for 6 h , effluent COD reached 1126 mg / L , SS reach 92 mg / L, COD removal rate of 68.01 % SS removal efficiency of 51.32% . Biological contact oxidation reaction process : biological contact oxidation reactor adding fillers , aeration , fillers flow in the aeration tanks , filler is determined using macroporous poly ammonium fat , the experiment determines the residence time of 9 hours , COD removal rate reached 90% , the effluent COD value of 112 mg / L , SS removal is due to the biofilm off . The precipitate is filtered adsorption process : activated carbon particle diameter of 1 mm , sand particle diameter of 1 to 3 mm , determine the flow rate control in less than 20 mL / min , the effluent COD of 48 mg / L , SS 11 mg / L , effluent COD removal rate to 57.14 % SS removal efficiency of 92.76% . Co-coagulation flotation, suspended activated carbon, biological contact oxidation , sedimentation , filtration and absorption process , the effluent COD by 2.2 × 10 ~ 4 mg / L was reduced to 48 mg / L or so , the removal rate of 99.78% , the simultaneous determination of SS 1.8 × 10 to 3 mg / L reduced to 11 mg / L , the removal rate reached 99.36 % , the pH value of 7 to 8 water comply with Liaoning Province integrated Wastewater Discharge Standard ( DB 21/1627-2008 ) requires the .
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