scholarly journals Kinetics of the Organic Compounds and Ammonium Nitrogen Electrochemical Oxidation in Landfill Leachates at Boron-Doped Diamond Anodes

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4971
Author(s):  
Barbara Krystyna Wilk ◽  
Małgorzata Szopińska ◽  
Aneta Luczkiewicz ◽  
Michał Sobaszek ◽  
Ewa Siedlecka ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Organic Compounds ◽  
Oxygen Demand ◽  
Ammonium Nitrogen ◽  
Cod Removal ◽  
High Concentration ◽  
Landfill Leachates ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Energy Consuming

Electrochemical oxidation (EO) of organic compounds and ammonium in the complex matrix of landfill leachates (LLs) was investigated using three different boron-doped diamond electrodes produced on silicon substrate (BDD/Si)(levels of boron doping [B]/[C] = 500, 10,000, and 15,000 ppm—0.5 k; 10 k, and 15 k, respectively) during 8-h tests. The LLs were collected from an old landfill in the Pomerania region (Northern Poland) and were characterized by a high concentration of N-NH4+ (2069 ± 103 mg·L−1), chemical oxygen demand (COD) (3608 ± 123 mg·L−1), high salinity (2690 ± 70 mg Cl−·L−1, 1353 ± 70 mg SO42−·L−1), and poor biodegradability. The experiments revealed that electrochemical oxidation of LLs using BDD 0.5 k and current density (j) = 100 mA·cm−2 was the most effective amongst those tested (C8h/C0: COD = 0.09 ± 0.14 mg·L−1, N-NH4+ = 0.39 ± 0.05 mg·L−1). COD removal fits the model of pseudo-first-order reactions and N-NH4+ removal in most cases follows second-order kinetics. The double increase in biodegradability index—to 0.22 ± 0.05 (BDD 0.5 k, j = 50 mA·cm−2) shows the potential application of EO prior biological treatment. Despite EO still being an energy consuming process, optimum conditions (COD removal > 70%) might be achieved after 4 h of treatment with an energy consumption of 200 kW·m−3 (BDD 0.5 k, j = 100 mA·cm−2).

Electrochemical oxidation of PFOA and PFOS in landfill leachates at low and highly boron-doped diamond electrodes

2021 ◽  
Vol 403 ◽  
pp. 123606 ◽  
Author(s):  
Mattia Pierpaoli ◽  
Małgorzata Szopińska ◽  
Barbara K. Wilk ◽  
Michał Sobaszek ◽  
Aneta Łuczkiewicz ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Diamond Electrodes ◽  
Landfill Leachates ◽  
Boron Doped Diamond ◽  
Boron Doped

scholarly journals Application of boron-doped diamond, Ti/IrO2, and Ti/Pt anodes for the electrochemical oxidation of landfill leachate biologically pretreated by moving bed biofilm reactor

2021 ◽  
Author(s):  
Arseto Yekti Bagastyo ◽  
Arum Sofiana Hidayati ◽  
Welly Herumurti ◽  
Ervin Nurhayati
Keyword(s):  
Electrochemical Oxidation ◽  
Total Nitrogen ◽  
Biofilm Reactor ◽  
Moving Bed Biofilm Reactor ◽  
High Concentration ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Moving Bed ◽  
Nitrogenous Compounds ◽  
Boron Doped

Abstract Conventional biological treatments used in most Indonesia landfill sites are mostly ineffective in treating stabilized landfill leachates to meet the standard regulation. Thus, combination of biological and electrochemical process is offered to successfully treat the leachates containing high concentration of organic and nitrogenous compounds. In this study, moving bed biofilm reactor (MBBR) was applied prior to electrochemical oxidation by using boron-doped diamond (BDD), Ti/IrO2, and Ti/Pt anodes with applied current of 350, 400 and 450 mA. The objectives were to investigate the effect of anode type and the applied current on the removal of organics as well as total nitrogen from the MBBR-treated leachate with electrochemical oxidation. The optimum removal of COD observed on the Ti/Pt anode was 78% by applying 400 mA, with the estimated energy of 56.7 Wh g L–1. In the case of Ti/IrO2 and BDD anodes, the optimum removal of COD was 76 and 85% with the energy consumption of 58.9 and 36.9 Wh g L–1, respectively, both achieved at 350 mA. Although all anodes showed less-satisfactory performances for total nitrogen reduction, around 46–95% removal of nitrogenous compounds was achieved by MBBR, with their partial conversion to nitrates.

scholarly journals Treatment of a Textile Effluent by Electrochemical Oxidation and Coupled System Electooxidation–Salix babylonica

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Alejandra Sánchez-Sánchez ◽  
Moisés Tejocote-Pérez ◽  
Rosa María Fuentes-Rivas ◽  
Ivonne Linares-Hernández ◽  
Verónica Martínez-Miranda ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Electrochemical Oxidation ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Coupled System ◽  
Treated Wastewater ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Effective Reduction ◽  
Salix Babylonica

The removal of pollutants from textile wastewater via electrochemical oxidation and a coupled system electrooxidation—Salix babylonica, using boron-doped diamond electrodes was evaluated. Under optimal conditions of pH 5.23 and 3.5 mA·cm−2 of current density, the electrochemical method yields an effective reduction of chemical oxygen demand by 41.95%, biochemical oxygen demand by 83.33%, color by 60.83%, and turbidity by 26.53% at 300 minutes of treatment. The raw and treated wastewater was characterized by infrared spectroscopy to confirm the degradation of pollutants. The wastewater was oxidized at 15-minute intervals for one hour and was placed in contact with willow plants for 15 days. The coupled system yielded a reduction of the chemical oxygen demand by 14%, color by 85%, and turbidity by 93%. The best efficiency for the coupled system was achieved at 60 minutes, at which time the plants achieved more biomass and photosynthetic pigments.

scholarly journals Feasibility of Micropollutants Treatment by Coupling Nanofiltration and Electrochemical Oxidation: Case of Hospital Wastewater

2015 ◽  
Vol 13 (2) ◽  
pp. 153-159 ◽  
Author(s):  
Yandi Lan ◽  
Clemence Coetsier ◽  
Christel Causserand ◽  
Karine Groenen Serrano
Keyword(s):  
Electrochemical Oxidation ◽  
Water Reuse ◽  
Membrane Bioreactor ◽  
Specific Energy Consumption ◽  
Oxygen Demand ◽  
Hospital Wastewater ◽  
Total Removal ◽  
Boron Doped Diamond ◽  
Filtration Process ◽  
Boron Doped

Abstract In spite of good performances of the membrane bioreactor (MBR) process, permeate from it can still contain refractory pollutants that have to be removed before water reuse or discharge. The present study is an attempt to combine the advantages of two well-known technologies, which are nanofiltration (NF) and electrochemical oxidation (EO) to treat MBR effluent from hospital wastewater. The concept is based on a preconcentration of micropollutants with a reduction of the wastewater volume by NF and treatment of the NF retentate by oxidation. During filtration process the rejection of ciprofloxacin, as a target molecule, reached beyond 97%. Then the NF retentate was treated by EO using a boron-doped diamond anode (BDD). Galvanostatic electrolyses showed that this anode is efficient to mineralize not only ciprofloxacin but also all the micropollutants and organics contained in MBR effluent. The results demonstrated that rapid mineralization occurred: the removal of total organic carbon and chemical oxygen demand (COD) reached 97% and 100%, respectively, in our conditions in 300 min maximum. The specific energy consumption for the total removal of COD was calculated to be 50 kW h kg˗1 COD.

Preparation and Characteristic Measurement of Born Doped Diamond Film Electrode on Tantalum Substrate and its Properties for Degradation of High COD Wastewater

2011 ◽  
Vol 138-139 ◽  
pp. 612-617 ◽  
Author(s):  
Cheng Yao Gao
Keyword(s):  
Diamond Film ◽  
Oxygen Demand ◽  
Chemical Vapor ◽  
Film Electrode ◽  
High Concentration ◽  
Boron Doped Diamond ◽  
High Current Efficiency ◽  
Boron Doped ◽  
Hot Filament

The boron-doped diamond film electrode grown on tantalum substrate (BDD/Ta) was prepared by hot filament chemical vapor deposition (HFCVD) technique. The morphology and quality of BDD/Ta film electrode were investigated by SEM and Raman spectroscopy respectively. The electrochemical behavior of the BDD/Ta film electrodes in Na2SO4 solution was also investigated by cyclic voltammetry and the window potential of BDD/Ta film electrode in Na2SO4 solution is of 4.1V, the hydrogen and oxygen evolution potentials are of-1.8V and +2.3V respectively. The characteristic measurements of BDD/Ta film electrode and its application to degradation of high concentration organic wastewater indicated that BDD/Ta film electrode have a series of advantages, including high overpotential for oxygen revolution, high current efficiency, good removal of chemical oxygen demand (COD).

Treatment of ink effluents from flexographic printing by lime precipitation and boron-doped diamond (BDD) electrochemical oxidation

2009 ◽  
Vol 60 (10) ◽  
pp. 2477-2483 ◽  
Author(s):  
Evan Diamadopoulos ◽  
Helen Barndõk ◽  
Nikolaos P. Xekoukoulotakis ◽  
Dionissios Mantzavinos
Keyword(s):  
Electrochemical Oxidation ◽  
Supporting Electrolyte ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Initial Value ◽  
Boron Doped Diamond ◽  
Treatment Performance ◽  
Boron Doped ◽  
Gravity Settling ◽  
Flexographic Printing

Effluent treatment from flexographic printing was investigated by precipitation/coagulation and electrochemical oxidation over boron-doped diamond electrodes. Precipitation with 3 g/L of lime led to complete removal of effluent turbidity (initial value of about 410 NTU) but only about 20% chemical oxygen demand (COD) decrease (initial value of about 1,900 mg/L). Higher lime dosages (up to 15 g/L) had no effect on separation. On the other hand, coagulation with alum in the range 0.05–1 mM failed to enhance the extent of solids separation achieved by gravity settling alone (i.e. about 60%). Preliminary electrochemical oxidation experiments in the presence of sulphuric acid as supporting electrolyte showed that treatment performance (in terms of COD removal and decrease in sample absorbance at 300 nm) increased with increasing applied current. The latter was more efficiently utilized at shorter treatment times and lower currents with efficiency reaching 30%. Following lime precipitation, the effluent was electrochemically oxidized at alkaline conditions for 360 min yielding 64% absorbance reduction and 50% COD removal (this corresponds to 60% overall COD removal for the combined process). The rather low electrochemical treatment performance may be attributed to limestone deposition and fouling of electrodes and other electrochemical reactor components as evidenced by the gradual drop in conductivity/current throughout the operation.

Electrochemical Oxidation of Organic Compounds using Boron-Doped Diamond Electrodes

2013 ◽  
Vol 45 (17) ◽  
pp. 19-30 ◽  
Author(s):  
P. M. Natishan ◽  
W. E. O'Grady ◽  
F. J. Martin ◽  
P. L. Hagans ◽  
H. Martin ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Organic Compounds ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Oxidation Of Organic Compounds
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