Textile dye wastewater TDW from a reactive azo dyeing process was treated by an Ž .
electrochemical oxidation method using TirPt as anode and stainless steel 304 as cathode. Due to
the strong oxidizing potential of the chemicals produced chlorine, oxygen, hydroxyl radicals and Ž
other oxidants when the wastewater was passed through the electrolytic cell the organic pollutants .
were oxidized to carbon dioxide and water. A number of experiments were run in a batch,
laboratory-scale, pilot-plant, and the results are reported here according to residence time and
initial addition of HCl in raw wastewater. When of 2 ml of HCl 36% were added and after 18 min 2 of electrolysis at 0.89 Arcm , chemical oxygen demand COD was reduced by 86%, biochemi- Ž .
cal oxygen demand BOD was reduced by 71%, ADMI color units were reduced by 100%, and Ž .5
TKN was reduced by 35%. The biodegradability of the wastewater was improved because the
CODrBOD ratio decreased from 2.16 to 1.52. At the same time the efficiency of the electrode
was about 170 g hy1 Ay1 my2
. and the mean energy consumption was 21 kW hrkg of COD.
These results indicate that this electrolytic method could be used for effective TDW oxidation or
as a feasible detoxification and color removal pretreatment stage for biological post treatment.
q 1999 Elsevier Science B.V. All rights reserved.
Textile dye wastewater TDW from a reactive azo dyeing process was treated by an Ž .electrochemical oxidation method using TirPt as anode and stainless steel 304 as cathode. Due tothe strong oxidizing potential of the chemicals produced chlorine, oxygen, hydroxyl radicals and Žother oxidants when the wastewater was passed through the electrolytic cell the organic pollutants .were oxidized to carbon dioxide and water. A number of experiments were run in a batch,laboratory-scale, pilot-plant, and the results are reported here according to residence time andinitial addition of HCl in raw wastewater. When of 2 ml of HCl 36% were added and after 18 min 2 of electrolysis at 0.89 Arcm , chemical oxygen demand COD was reduced by 86%, biochemi- Ž .cal oxygen demand BOD was reduced by 71%, ADMI color units were reduced by 100%, and Ž .5TKN was reduced by 35%. The biodegradability of the wastewater was improved because theCODrBOD ratio decreased from 2.16 to 1.52. At the same time the efficiency of the electrodewas about 170 g hy1 Ay1 my2. and the mean energy consumption was 21 kW hrkg of COD.These results indicate that this electrolytic method could be used for effective TDW oxidation oras a feasible detoxification and color removal pretreatment stage for biological post treatment.q 1999 Elsevier Science B.V. All rights reserved.
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