Treatment of real printing wastewater with an electrocatalytic process
| Autor: | Yu-Chang Lai, Cheng-Hung Tung, Jih-Hsing Chang, Yang-Ming Hsu, Shan-Yi Shen |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Powdered activated carbon treatment
Materials science Inorganic chemistry Environmental engineering Filtration and Separation Conductivity Electrocatalytic process Electrode material Analytical Chemistry Anode Catalysis Printing wastewater chemistry.chemical_compound Wastewater chemistry Electrode Hydroxyl radical Effluent Power activated carbon |
| Zdroj: | Separation and Purification Technology. 117:131-136 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2013.07.028 |
| Popis: | Many chemicals used in modern printing processes are either toxic or difficult to decompose, which results in the production of complicated and refractory printing wastewater. In this study, an electrocatalytic technology with different catalytic electrodes was employed to treat a real printing wastewater, and the production rates of hydroxyl radicals were determined. The results indicate that under a voltage gradient of 11 V cm −1 , the production concentration of hydroxyl radicals by various electrodes followed a decreasing order of TiO 2 > DSA (dimensional sustainable anode with IrO 2 ) > graphite, with the values of 8.21 × 10 −3 , 5.24 × 10 −3 , and 0.86 × 10 −3 M, respectively. A lower wastewater conductivity could lead to a greater electric voltage thus contributing to a higher removal efficiency of TOC and chroma. At a current density of 50 mA cm −2 and using one pair of electrodes (IrO 2 + stainless steel), the TOC and chroma removal efficiencies reached 71% and 53% after 60 min treatment. Under the same operation conditions but using two pairs of electrodes, the removal efficiencies of TOC and chroma were increased to 75% and 82%, respectively. The removal efficiencies of TOC and chroma could be further raised to 90% and 92% if the electrocatalytic effluent was polished by powder activated carbon absorption. |
| Databáze: | OpenAIRE |
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