Research on Coal Chemical Wastewater Treatment by Nano-TiO₂ Powder Photocatalytic Oxidation Process

Abstract:

Abstract. With TiO₂ as photocatalyst, hydrogen peroxide(H₂O₂) as oxidant, treated the coal chemical wastewater under the condition of 30W UV lamp irradiation. Discussed the effects of those factors—pH, dosage of TiO₂ powder, dosage of FeCl₃, dosage of H₂O₂ and illumination time etc. on Chemical Oxygen Demand(COD) removal rate of wastewater. The results have shown that: when taking the pH of raw water, TiO₂ 0.2g per 100ml wastewater, FeCl₃ 0.01g per 100ml wastewater, H₂O₂ 1.2 ml per 100ml wastewater, 5h illumination time, quiet place 3h, acquired the best photocatalytic effect. After treated under the optimum technological conditions, the COD removal rate reached 70.09%; the removal rate of Biological Oxygen Demand(BOD₅), ammonia nitrogen, cyanide and color reached respectively to 58.60%、39.99%, 72.41% and 90%. After repeated 10 times, all the active of TiO₂ was almost lost. With the regeneration treatment by high-temperature cauterization, the regenerated catalyst was added into the raw wastewater. Then under the optimum technological conditions, after illuminated 7h, the COD removal rate of wastewater recovered to 49.47%.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 2232-2236
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.2232
• Online since: July 2012
• Authors: Pei Yao Xu, Xiu Jie Chu, Yan Qing Li, Fan Zhang
• Keywords: Active Regeneration., Inactivation, Photocatalyst, Titanium Dioxide (TiO₂)

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