||The KOH concentration of the very high organics contaminated wastewater from the process of the recovery of color glass filter plate is about 1.7N. The very high organics contaminated wastewater should be reduced to a suitable pH range of 9 to12, so that it can be treated by other process. Electrodialysis is a suitable process to reduce the basicity of the wastewater and simultaneously recover the KOH. And the process after electrodialysis is wet air oxidation.|
This research is the very high organics contaminated wastewater from the process of the recovery of color glass filter plate treatment by catalytic Wet Air Oxidation (COD 160000-180000 ppm), pH > 14, conductivity is 87 mS/cm . At the first, this research carries on the choice of the catalyst, compare CuO, Cu2O and Ru on Carbon , MnO2 , Co3O4, ZnO etc. to react for 120 minutes at 120 oC, some of them could make COD removal % increase effectively , and the more effective catalysts in COD removal % are respectively Cu2O : 29.7 % , CuO : 21 % , Co3O4 : 19 %, the result to show Cu2O has better oxidation ability, so choose Cu2O as catalysis for process.
And then, comparing the no catalyst system and different kind of catalysts system, carry on the comparison of conductivity , pH and COD removal %, and change the parameter as react temperature, oxygen pressure, stirring speed , amount of catalyst, in order to seek the optimum condition. stirring speed, there is better getting COD removal in above 500 rpm , so choose 600 rpm; And temperature is more effective above 120 ℃; The pressure is increase with Po2, COD removal % is also increase relatively, so choose Po2 =500 psig, and Pt = 530 psig; the amount of Catalyst shows that 1.2 g (15 g/L) has better COD removal %.
Synthesize the above result finally, it is determined that the optimum operation parameters (stirring speed 600 rpm , temperature 120 ℃, Po2 = 500 psig ,the amount of catalysis is 1.2 g (15 g/L),but with the increasing of time, the quantity of the carbon dioxide increases too. It makes Po2 drop and difficult to enter reactor, so we cooperate with many steps and changing temperature to 150 oC upper 150 min to operate to reject the carbon dioxide and increase COD removal %. After operating the many steps in the optimum conditions, the COD removal could be up to 91.69 % already , can make the very high organics contaminated wastewater to decompose.
||. 呂冠霖，司洪濤 “氧化技術在高濃度COD廢水處理之應用” 經濟部工業局綠色技術平台之廢水防治。|
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