Photocatalytic Treatment for Final Polishing of Wastewater from a Cellulosic Ethanol Process
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Gayathri RamMohan
Abstract
As a final polishing step, photocatalytic oxidation of anaerobically and aerobically treated lignocellulosic ethanol stillage was studied using titanium dioxide (TiO2) coated reusable sheets (TiO2 loading ~3 mg/cm2), activated by UV (180 nm) light, for simultaneous reduction of organics and decolorization. Experiments were performed to study the effect of initial soluble chemical oxygen demand (sCOD), pH and depth of the wastewater treated in the photoreactor setup. Organic concentration of 3000 mg sCOD/L in anaerobically digested effluent was an obstacle for efficient photocatalytic treatment. Therefore, anaerobically digested stillage was further treated in an aerobic biological process to reduce sCOD to 1350 mg/L. There was very little decolorization (~25%) at a pH of 9 or above. But on adjusting and maintaining the pH at neutral value the extent of color removal via photocatalysis was 91.3%, 91.5% and 77% after 22, 55 and 80.5 hours for 1, 3 and 5 mm depths of treated anaerobic-aerobic stillage, respectively. The final treated sCOD was reduced to 80 mg/L.
© 2016 by Walter de Gruyter Berlin/Boston
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- The Effect of Boron Content on Properties of B-TiO2 Photocatalyst Prepared by Sol-gel Method
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Articles in the same Issue
- Degradation Kinetics of Reactive Black 5 Wastewater by UV/H2O2
- Thick TiO2 Sol – gel Films for Water Detoxification: Synthesis, Characterization and Use for Photocatalytic Oxidation
- Aqueous Photocatalytic Oxidation of Doxycycline
- Photocatalytic Treatment for Final Polishing of Wastewater from a Cellulosic Ethanol Process
- Titanium Dioxide-mediated Photocatalysed Mineralization of Two Selected Organic Pollutants in Aqueous Suspensions
- The Effect of Boron Content on Properties of B-TiO2 Photocatalyst Prepared by Sol-gel Method
- Color and COD Removal of Azo Dye ‘Basic Blue 9’ by Fenton Oxidation Process: Determined of Optimal Parameters and Kinetic Study
- Improved Visible Light Photocatalytic Performance of Flower-like Bi2O3
- Electrochemical Treatment of Oilfield Produced Wastewater on Ni-Sb- SnO2/Ti Electrodes
- Decolorization of Reactive Black 5 using Peroxymonosulfate in Fentonlike Process
- Photocatalytic/Adsorptive Removal of Methylene Blue Dye by Electrophoretic Nanostructured TiO2/Montmorillonite Composite Films
- Reuse of Homogeneous Fenton’s Sludge from Detergent Industry as Fenton’s Catalyst
- TiO2-assisted Photocatalytic Degradation of Diazo Dye Reactive Red 120: Decolorization Kinetics andMineralization Investigations
- Preparation of CIGS Thin Films by HiPIMS or DC Sputtering and Various Selenization Processes
