Treatment of pretreated coke wastewater by electrocoagulation and electrochemical peroxidation processes

Özyonar, Fuat; Karagözoğlu, Bünyamin

doi:10.1016/j.seppur.2015.07.011

Cited by 73 publications

(18 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3a, b, it can be observed that the % color removal and % TOC removal were increased as the current density increased, but after the optimum value, further increase in current density does not help in improving the removal of % color and TOC (Kalyani et al 2009). The increase in current density resulted in the production of large amount of Al 3+ ions via anodic metal dissolution, more H 2 bubbles was formed at the cathode, which are profitable for the separation or flotation process (Ozyonar and Karagozoglu 2015). From Fig.…”

Section: Combined Effect Of Current Density (X 1 ) and Inter-electrodmentioning

confidence: 90%

Removal of pollutants with determination of power consumption from landfill leachate wastewater using an electrocoagulation process: optimization using response surface methodology (RSM)

et al. 2018

View full text Add to dashboard Cite

Treatment of landfill leachate wastewater by electrocoagulation process using an aluminium electrode was investigated in a batch electrochemical cell reactor. Response surface methodology based on central composite design was used to optimize the operating parameters for the removal of % color and % total organic carbon (TOC) together with power consumption from landfill leachate. Effects of three important independent parameters such as current density (X 1 ), inter-electrode distance (X 2 ) and solution pH (X 3 ) of the landfill leachate sample on the % color and % TOC removal with power consumption were investigated. A quadratic model was used to predict the % color and % TOC removal with power consumption in different experimental conditions. The significance of each independent variable was calculated by analysis of variance. In order to achieve the maximum % color and % TOC removal with minimum of power consumption, the optimum conditions were about current density (X 1 )-5.25 A/dm 2 , inter-electrode distance (X 2 )-1 cm and initial solution of effluent pH (X 3 )-7.83, with the yield of color removal of 74.57%, and TOC removal of 51.75% with the power consumption of 14.80 kWh/m 3 . Electrocoagulation process could be applied to remove pollutants from industrial effluents and wastewater.

show abstract

Section: Combined Effect Of Current Density (X 1 ) and Inter-electrodmentioning

confidence: 90%

Removal of pollutants with determination of power consumption from landfill leachate wastewater using an electrocoagulation process: optimization using response surface methodology (RSM)

et al. 2018

View full text Add to dashboard Cite

show abstract

“…(14)], a weak oxidant compared with the hydroxyl radical [40] results in slower degradation. Ozyonar et al [20] reported that for the maximum removal of COD and TOC from pre-treated coke wastewater by ECP was achieved at an optimum H 2 O 2 concentration of 10 g/L.…”

Section: Effect Of Hydrogen Peroxidementioning

confidence: 99%

“…The applied DC current between them dissolves the anode and provide Fe 2+ ions that react with the hydrogen peroxide to produce Fe 3+ ions. The major advantage of ECP process is that the ferric ions can be recycled into ferrous ions, so that they behave like a catalyst [20].…”

Section: Introductionmentioning

confidence: 99%

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selvabharathi¹,

Adishkumar²,

Banu³

2019

DWT

View full text Add to dashboard Cite

Chromium(III) used in tanning process is not consumed fully and around 30-40% of Chromium(III) is washed away to the environment causing severe environmental problem especially to the aquatic system. To remove Chromium(III) from wastewater, many different treatment techniques have been developed. This study deals with the ability of electrochemical peroxidation process for the removal of Chromium(III) from tannery wastewater in a batch stirred tank bench scale reactor with hopper bottom of 5 L working volume equipped with two iron electrodes which were investigated. The removal percentage of chromium was determined by varying operating parameters such as pH = 2-8, Fe 2+ = 2-5 mg/L, H 2 O 2 = 5-20 mg/L and current density = 10-40 mA/cm 2 were studied. The results showed that the Chromium(III) removal efficiency of 87% was achieved under optimum condition such as pH = 2, Fe 2+ = 2 mg/L H 2 O 2 = 15 mg/L, current density = 30 mA/cm 2 and contact time was 120 min with an electrical energy consumption of 0.073 kWh/L. The operating costs for the removal of Chromium(III) was found to be 0.4 $/m 3 for treated tannery wastewater. The electrochemical peroxidation process proved to be an efficient and appropriate technique for the removal of Chromium(III) from tannery wastewater.

show abstract

“…Due to the composition and specificity of contaminants occurring in the coke oven wastewater, its proper treatment requires the involvement of physical, chemical and biological methods. For example, sometimes physicochemical treatment for coke plant effluents is enough (Ghose 2002) but also more sophisticated methods after primary physicochemical treatment are tested (Ozyonar and Karagozogly 2015) and in many plants also biological methods are used (Li et al 2003;Xuewen et al 2013). The methods very probably could be used for UCG wastewater cleaning but it needs dedicated research and examinations.…”

Section: Comparison Of the Wastewater From Ucg And Wastewater From Comentioning

confidence: 99%

Comparison of the Contaminants in the Wastewater Produced in the Ex Situ Underground Ortho- and Meta-Lignite Gasification

Kapusta

Stańczyk

Wiatowski

2019

Water Air Soil Pollut

View full text Add to dashboard Cite

This work comprises results of the laboratory tests on formation and potential release of contaminants from underground gasification of lignites. Four large scale and multi-day trials were carried out using exsitu gasification facilities. Two different kinds of lignite were tested, i.e. Velenje lignite (Slovenia) and Oltenia lignite (Romania). Gasification tests were conducted in the artificial coal seams under two distinct pressure regimes-atmospheric and high pressure regime (35 bar and 10 bar for the Velenje and Oltenia samples respectively). The UCG wastewater samples were periodically collected from the gas purification module to measure the rate of the wastewater and contaminants production at each phase of the experiment and to assess the effect of gasification pressure and lignite physicochemical properties. The group of target contaminants included: phenols, aromatic hydrocarbons, and some non-specific water parameters. The effect of gasification pressure was confirmed, especially for BTEX and phenols and significant drops in the contents of these compounds were observed at elevated pressures. The effect of pressure was more pronounced for the geologically older coal (Velenje), i.e. drop in the average concentrations from 1994 μg/l (atmospheric) to 804 μg/l (35 bar) and from 733 mg/l (atmospheric) to 17 mg/l (35 bar) for BTEX and total phenols, respectively. The differences in the macromolecular structure and ash content of the both coals were found to be the main reason behind the differences in the contents of organic and inorganic species respectively. The study also shown that composition of UCG wastewaters significantly varied over the time of the particular experiments, which reflected changes in the gasification thermodynamic conditions and development of oxidation and pyrolysis zones. During the atmospheric gasification experiments, the values of BTEX for the Velenje lignite dropped from 3434 μg/l to 1364 μg/l and for the Oltenia lignite from 1833 μg/l to 978 μg/l. A similar downward trend in the concentrations of BTEX was observed for the pressurized experiments. For the Velenje trial a drop from 1111.6 μg/l to 211.2 μg/l and for the Oltenia-from 1695 μg/l to 688 μg/l was observed. Concentrations of phenolic compounds during the atmospheric gasification experiments varied significantly during both atmospheric trials and no significant trends were noticed.

show abstract

Treatment of pretreated coke wastewater by electrocoagulation and electrochemical peroxidation processes

Cited by 73 publications

References 53 publications

Removal of pollutants with determination of power consumption from landfill leachate wastewater using an electrocoagulation process: optimization using response surface methodology (RSM)

Removal of pollutants with determination of power consumption from landfill leachate wastewater using an electrocoagulation process: optimization using response surface methodology (RSM)

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Comparison of the Contaminants in the Wastewater Produced in the Ex Situ Underground Ortho- and Meta-Lignite Gasification

Contact Info

Product

Resources

About