An experimental investigation of chemical oxygen demand removal from the wastewater containing oxalic acid using three-phase three-dimensional electrode reactor

2002 ◽  
Vol 7 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Ya Xiong ◽  
Hans T. Karlsson
Keyword(s):  
Experimental Investigation ◽  
Oxalic Acid ◽  
Chemical Oxygen Demand ◽  
Three Dimensional ◽  
Oxygen Demand ◽  
Chemical Oxygen Demand Removal ◽  
Three Phase

scholarly journals TiO2 BEADS FOR PHOTOCATALYTIC DEGRADATION OF HUMIC ACID IN PEAT WATER

2011 ◽  
Vol 11 (3) ◽  
pp. 253-257 ◽  
Author(s):  
Winarti Andayani ◽  
Agustin N M Bagyo
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Oxalic Acid ◽  
Chemical Oxygen Demand ◽  
Photocatalytic Degradation ◽  
Uv Light ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Color Intensity ◽  
Before And After

Degradation of humic acid in aqueous solution containing TiO2 coated on ceramics beads under irradiation of 254 nm UV light has been conducted in batch reactor. The aim of this experiment was to study photocatalytic degradation of humic acid in peat water. The irradiation of the humic acid in aqueous solution was conducted in various conditions i.e solely uv, in the presence of TiO2-slurry and TiO2 beads. The color intensity, humic acid residue, conductivity and COD (chemical oxygen demand) of the solution were analyzed before and after irradiation.  The compounds produced during photodegradation were identified using HPLC. The results showed that after photocatalytic degradation, the color intensity and the COD value of the solution decreased, while the conductivity of water increased indicating mineralization of the peat water occurred. In addition, oxalic acid as the product of degradation was observed.

Chemical Oxygen Demand Removal from Wastewater by Integrated Bioreactor

2015 ◽  
Vol 8 (5) ◽  
pp. 238-243 ◽  
Author(s):  
Ezerie Henry Ezec ◽  
Shamsul Rahman Bin Mohamed Ku ◽  
Mohamed Hasnain Is ◽  
Amirhossein Malakahmad ◽  
Salihi Umar Ibrahim
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Chemical Oxygen Demand Removal ◽  
Integrated Bioreactor

An electrochemical mechanisms study on steel/IrO2–Sb2O3 electrodes for oxidation of phenol in water

2015 ◽  
Vol 93 (5) ◽  
pp. 536-541
Author(s):  
Pavithra Bhakthi Jayathilaka ◽  
Gayani Chathurika Pathiraja ◽  
Athula Bandara ◽  
Nalaka Deepal Subasinghe ◽  
Nadeeshani Nanayakkara
Keyword(s):  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Hydroxyl Radicals ◽  
Oxygen Demand ◽  
Oxidation Mechanism ◽  
Constant Current ◽  
Anode Surface ◽  
Radical Scavenger ◽  
Chemical Oxygen Demand Removal ◽  
Constant Current Density

Phenol, a known water pollutant, was electrochemically oxidized on a steel/IrO2–Sb2O3 novel anode. Since the oxidation mechanisms vary based on the anode material, a mechanisms study of electrooxidation of phenol on it was conducted. The phenol oxidation was carried out at 20 mA/cm2 constant current density with a pH 11.00 Na2SO4 medium at room temperature. During 6 h of electrolysis, samples were tested for chemical oxygen demand removal efficiency of the anode. The steel/IrO2–Sb2O3anode showed 76.3% chemical oxygen demand removal efficiency. Both 4-nitroso-N,N-dimethylaniline and the HCO3–/CO32– radical scavenger tests confirmed the formation and presence of the hydroxyl radicals in the system. Therefore, it was concluded that the hydroxyl radicals that are generated on the anode surface are the main cause for the oxidation mechanism. Moreover, ICE, HPLC, and UV-vis absorbance and cyclic voltammetry results confirmed the presence of catechol and benzoquinone as intermediates and the reaction mechanism.

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