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- Xiong, Y, et al.
(författare)
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Performance of three-phase three-dimensional electrode reactor for the reduction of COD in simulated wastewater-containing phenol
- 2003
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Ingår i: Chemosphere. - 1879-1298. ; 50:1, s. 131-136
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Tidskriftsartikel (refereegranskat)abstract
- The removal of chemical oxygen demand (COD) from wastewater-containing phenol was investigated using three-phase three-dimensional electrode reactor. Special attention was paid to experimentally probe the performance of the reactor in COD removal in the process of repeated batch runs. The experimental results showed that the reactor could remove COD from phenol-containing wastewater much more efficiently than both granulated activated carbon (GAC) adsorption bed and conventional three-dimensional electrode. For 200th batch run, the three-phase three-dimensional electrode reactor with an airflow of 5 1 min(-1) and a cell voltage of 30 V could remove 1350 ppm COD from the wastewater in 30 min while conventional three-dimensional electrode reactor with a same cell voltage and GAC adsorption bed with a same airflow only could remove 610 and 1000 ppm, respectively, at the same reaction duration. Although it was found that COD removal decreased with increasing repeated batch runs in our experimental range, due to adsorption saturation of GAC and electrode passivation, the extent of decrease for the three-phase three-dimensional electrode is much less than those for conventional three-dimensional electrodes and GAC adsorption beds. The passivated reactor could be partly re-activated by electrolysis in the presence of MnO2. (C) 2002 Elsevier Science Ltd. All rights reserved.
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- Xiong, Y, et al.
(författare)
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Treatment of dye wastewater containing acid orange II using a cell with three-phase three-dimensional electrode
- 2001
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Ingår i: Water Research. - 1879-2448. ; 35:17, s. 4226-4230
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Tidskriftsartikel (refereegranskat)abstract
- The removal of color and chemical oxygen demand (COD) from simulated dye wastewater containing Acid Orange II was experimentally investigated using coagulation-electrooxidation. Two kinds of coagulation methods, ferrous-mediated coagulation and electrocoagulation were tested as pretreatment. The electrooxidation was carried out in a cell with a three-phase three-dimensional electrode using granular activated carbon as particle electrodes. Particular attention was paid to probe the effect of cell voltage, airflow rate, solution conductivity and treatment time on the electrochemical treatment efficiency. The experimental results showed that the coagulation-electrooxidation process could efficiently remove the color and the COD from the simulated dye wastewater. The overall COD and color removal efficiencies reached as high as 99% and 87%, respectively, by ferrous coagulation (molar rate of Fe(II)/dye: 0.5) and 30-min electrolysis (cell voltage: 20.0V and airflow: 0.1 m(3)h(-1)). (C) 2001 Elsevier Science Ltd. All rights reserved.
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