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Advanced oxidative water treatment process for water disinfection using an Electrohydraulic Discharge Reactor and TIO2 immobilized on Nano fibres
Expanded Title:This project focuses on the use of advanced oxidation technologies such as the electrohydraulic discharge (EHD) system for decomposing organics and inactivating microbes. This system was considered due to its greater efficiency, energy saving, high speed, use of few or no chemicals, and non-destructive impacts upon the ecosystem. In this project, the design and methods for applying electrical energy to single or multiple electrodes was explored and described. The proof of degradation was confirmed with model dye solutions, and E. coli was used as a model for microorganisms. Results obtained from the optimisation of the EHD system were as follows: optimum dye concentration (5 mg/L), solution pH (2.5), solution volume (1500 mL), air flow rate (3 L/min), 1.5 mm silver electrode, applied voltage (25 V), current (4 A), NaCl electrolyte (50 g/L) a contact time of 60 minutes. Moreover, no corrosion was observed with silver electrodes, whereas previously used copper electrodes showed significant corrosion after a few electrohydraulic cycles. Further increase in MB concentration above 5 ppm resulted in a decrease in the decolourization rate under the optimised conditions. with application of the optimised conditions on MB decolourization/degradation, 99.99% MB decolourizations rate was achieved within 20 minutes of contact time. Therefore, the optimized EHD system showed an improvement in reduction of the treatment time with a corresponding 53 % total organic carbon (TOC) reduction. The free reactive species (H2O2 and O3) were also detected and quantified. After 10 minutes of experiment, about 3.73 x 10-5 mol/L H2O2 was produced which decreased to 2.93 x 10-5 mol/L with a low concentration of O3 concentration. However, 0.5 mol/L of O3 was detected after 20 minutes of contact time, thereafter, H2O2 concentration decreased continuously with time while that of O3 fluctuated as the treatment time increased. Thus MB degradation in the optimized EHD configuration was mostly initiated by generated H2O2 and O3. The DBD system was shown to be a viable technique for decomposing non-biodegradable organic pollutants and microorganisms such as E.coli commonly detected in water. This study developed an optimized single cell EHD system that can incorporate a supported UV active TiO2 photocatalyst and the system is capable of degrading organic pollutants in wastewater within 20 minutes without chemical additives therefore presenting an advantage over current technologies.
Date Published:01/08/2015
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial, Wastewater Management - Sewers
Document Keywords:Operation and Maintenance, Technology
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2132/1/15
ISBN No:978-1-4312-0692-6
Authors:Petrik LF; Fatoba OO; Totito T
Project No:K5/2132
Document Size:3 281 KB
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