The Application Of Electrochemical Combined Technology For Resource Utilization In Industrial Wastewater

With the discharge standards of wastewater enhancing, the pretreatment of wastewater become very important. It is difficult to degrad for industrial wastewater,especially complex industrial wastewater.Only one wastewater treatment method cannever longer meet the current needs of most industrial wastewater treatment. Airstripping removing volatile organic compounds show high efficiency. Theelectrochemical oxidation removes refractory organic matters. The wastewater can betreated efficiently by activated carbon adsorption method. Combining with theadvantages of the three methods, we choose the appropriate parameters to deal with avariety of wastewater and study the feasibility of this approach.（1） Based on the research of wastewater composition establishes accurateanalysis method, lay the foundation for the analysis of degradation matter content.Determination of COD is COD analyzer. Determination of chloride ion is silvernitrate titration. Determination of organic trace analysis is gas chromatography.Determination of ammonia nitrogen is Nessler’s reagent spectrophotometry.（2） Taking the saponification wastewater from epoxy propane by chlorohydrinprocess as research key objects, discuss separately the treatment efficiency of airstripping, electrochemical oxidation and activated carbon adsorption method. Theresults showed that one method can not only been used to remove the organics in thewastewater but also time-consuming and high energy consumption; however, the combined technology of three methods removes organics of saponificationwastewater with high efficiency. The optimal conditions are temperature of55℃,airvelocity of150mL/min, stripping time of15min, the COD removal rate is45.8%,COD is520mg/L, the concentration of DCIP is230mg/L; the anode ofTi/RuO₂-TiO₂-SnO₂,cathode of Ti, electrode area of3×3cm²,current density of50mA/cm²,electrolytic time of20min, the COD removal rate is45%, theconcentration of DCIP is0; after the electrolysis treatment, add activated carbon of0.3g/50mL, temperature of35℃, adsorption of15min,the COD is0.（3） Basing on the research of mixing treatment technology for oil refining, finechemical industry, epoxy propane saponification wastewater, discussed the treatmentefficiency of the three methods separately and electrochemical oxidation combinedtechnology. The results prove that any single method does not remove completelypropylene glycol and ammonia nitrogen. In terms of the energy consumption and time,electrochemical oxidation combined technology is the best method. The optimalconditions is: stripping time of15min, the removal rate of ammonia nitrogen is75%;electrolysis time of15min, ammonia nitrogen is degraded completely, the removalrate of propylene glycol is70%; lastly, propylene glycol is degraded completely byactivated carbon adsorption method in10min. In conclusion，the wastewater isdegraded completely by electrochemical oxidation combined technology.（4） In conclusion, It is feasible that electrochemical oxidation combinedtechnology is applied to resource utilization technology for saponification wastewaterfrom epoxy propane by chlorohydrin process. It is feasible in technique andreasonable in economy. The comprehensive waste water with the same propertiesdisposed high efficiently by using this method. In the same time, this technology hasbeen used widely in the similar wastewater and is worth reasonable spreading andusing.