In order to treat high-ammonia-nitrogen (NH3-N) landfill leachate nanofiltration concentrate (LLNC), an Fe-loaded, activated C-based Ni-foam composite electrode was prepared via ferrous ion impregnation and calcination in a nitrogen atmosphere. The composite electrode was used as a cathode and combined with a dimensionally stable anode (DSA) to form the electro-Fenton system. On the basis of single-factor experiments, a response surface methodology (RSM) was applied to evaluate the influence factors. A second-order polynomial was then obtained, and the optimum treatment conditions for the LLNC were found to include an applied voltage of 10 V, initial pH of 2.81, electrode spacing of 1.53 cm, chemical oxygen demand (COD) removal rate of 77.24 % at 300 min, and an applied voltage of 9.02 V, initial pH of 3.90, electrode spacing of 1.04 cm, and an NH3-N removal rate of 74.62 %. Three-dimensional excitation-emission matrix fluorescence spectroscopy of the LLNC before and after the electro-Fenton reaction revealed that the fluvic and humic acid-like substances, as well as the soluble microbial byproducts, were effectively removed from the LLNC. These results indicate that the electro-Fenton system can both inhibit the consumption of Fe ions and efficiently reduce the pollution indices (e.g., COD, NH3-N, and color) of LLNC without the addition of a Fenton's reagent or the production of Fe-sludge.

Treatment of high-ammonia-nitrogen landfill leachate nanofiltration concentrate using an Fe-loaded Ni-foam-based electro-Fenton cathode

Abstract This study presents the degradation and the mineralization of Metolcarb or 3-methylphenyl methylcarbamate by electro Fenton process with volume cathode. This pesticide was treated using this cathode which is filled with graphite carbon granules. The solutions of Metolcarb were electrolyzed in an reactor of 1.4 liter which shows the performance and the efficiency of the process. Indeed, the effects of different parameters such as the initial concentration of Metolcarb and the intensity of applied current on the degradation kinetics of Metolcarb have been discussed as a function of time. The found results proved that the insecticide removal followed a pseudo first order. The competitive kinetics analysis of Metolcarb during its electrochemical treatment was carried out by using benzoic acid as a reference compound. The absolute rate constant for the oxidation of Metolcarb by hydroxyl radicals consequently is equal to 3.59 × 10 9 L mol − 1 s − 1 . The mineralization of Metolcarb in terms of total organic carbon was monitored during its electrolysis by the electro Fenton process. The organic carbon is then equivalent to the total carbon determined in reaction analysis. Carbon chains can therefore be formed. The various intermediates which are produced into the electrochemical processing of Metolcarb were determined by the mass spectrometry LC/MS. The biodegradation of Metolcarb has also been investigated in active clay. 

Oxidative degradation of Metolcarb by electro Fenton process

This paper applies a novel three-dimensional dual-cathode-electro-Fenton process to treating pickle sauerkraut wastewater,investigates the influencing factors of the organic matters removal and the treatment effect and obtains the optimal experimental conditions by orthogonal experiment.Orthogonal test results show that the influence degrees of various factors on the removal of COD from sauerkraut wastewater are different,pH current densitythe dosage of Fe2+the dosage of activated carbondistance of electrodethe dosage of conductive medium Na2SO4electrolysis temperature.By comparing the three-dimensional dual-cathode-electro-Fenton method with the traditional electro-Fenton method,we find that the generating H2O2 value in cathode electrode,current efficiency(CE),Fe2+concentration of the solution and COD removal efficiency of three-dimensional dual-cathode electro-Fenton are higher than those of the traditional single-cathode electro-Fenton system.The paper also analyses the reaction mechanism.All the results suggest that this electrochemical oxidation process by three-dimensional dual-cathode-electro-Fenton might provide an alternative for the degradation of pickle sauerkraut wastewater.

Treatment of Pickle Sauerkraut Wastewater by A Three-Dimensional Dual-Cathode Electro-Fenton Oxidation

https://www.researchsquare.com/article/rs-1404894/latest.pdf

Thiram and Ziram wastewater is a type of pesticide wastewater with high COD, high ammonia nitrogen and unpleasant odor. In this paper, Fenton, iron-carbon, micro-electrolysis, Electro-Fenton and other methods were used to treat theThiram and Ziram wastewater, the Electro-Fenton process is best. And the improved Electro-Fenton plant was used treat wastewater to explore the impact of pH, current density, packing ratio and amount of filler on the removal efficiency of COD. The optimal operating conditions with low processing cost and high removal efficiency were determined. The results showed that the COD removal efficiency of the modified Electro-Fenton process for the treatment of the ThiramandZiram wastewater was increased from 52.96% to 75.62%.Based on the result, the higher current density and the more the filler content, the higher the removal efficiency. The optimumH is 3, optimumiron-carbon ratio is 1 to 2.

https://www.dpi-proceedings.com/index.php/dtetr/article/download/25528/24942

Study on Treating Thiram and Ziram Wastewater by Improved Electric-Fenton Process

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Study on Treating Thiram and Ziram Wastewater by Improved Electric-Fenton Process