Electrochemical oxidation for landfill leachate treatment

Deng, Yang; Englehardt, James D.

doi:10.1016/j.wasman.2006.02.004

Cited by 330 publications

(187 citation statements)

References 47 publications

(79 reference statements)

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“…Concentration of heavy metals in a landfill is generally higher at earlier stages because of higher metal solubility as a result of low pH caused by production of organic acids [19]. With a low pH due to increased waste generation, there is a likely increase in metal solubility occurring as a result of rapid increase in concentration of heavy metals due to production of heavy metal complex with humic acids [27]. This assertion supports the likelihood of increase in the concentration of heavy metals in all the dumpsites in later years.…”

Section: International Letters Of Natural Sciences Vol 57mentioning

confidence: 99%

Leachate Characterization and Leachate Pollution Index from Landfill Dump Sites in Warri Metropolis, Nigeria

Godwin

Edjere

2016

ILNS

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ABSTRACT. The paucity of standard engineered landfills in Nigeria has given rise to the proliferation of open waste dumpsites. The environment can be impacted by leachates from these dumpsites if not properly managed. This study assessed the characteristics of leachates from three open dumpsites in Warri Metropolis and its contamination potential using leachate pollution index (LPI). The dump sites had low pH with acidic level lower than the recommended limit. The calculated LPI values of the three sites ranges from 6.377 to 7.438. These values are low when compared to open dumpsites in other metropolitan areas of similar climatic conditions. The low value of LPI for leachate indicates relatively lower contaminant potential due to low concentrations of heavy metals, relatively young age of the landfill as well as low population and organic origin of the wastes. The calculated low LPI value does not in any way preclude the continuous monitoring of the dumpsites as the values recorded are just slightly below the threshold level. It is recommended that there should be an upgrade of all open dumpsites to a standard engineered landfill with a robust and effective monitoring put to curtail future release of deleterious materials from these dumpsites

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Section: International Letters Of Natural Sciences Vol 57mentioning

confidence: 99%

Leachate Characterization and Leachate Pollution Index from Landfill Dump Sites in Warri Metropolis, Nigeria

Godwin

Edjere

2016

ILNS

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“…With the strict environmental regulations regarding wastewater discharge in recent years, electrochemical technology has been widely utilized in the treatment of various types of wastewaters such as textile [4][5][6], oil and oil-in-water emulsion [7][8][9], laundry [10][11][12], livestock [13][14][15], leachate [16][17][18], and sewage [2,[19][20]. The use of electrochemical technology provides several benefits, such as strong oxidation, easy operation, no limitation by a seasonal variation, variable capability to influent flux and quality, and rapid treatment time, over the conventional wastewater treatment methods.…”

Section: Introductionmentioning

confidence: 99%

“…Pollutants such as suspended particles and matter containing organics and nitrogen in wastewater can be rem oved by electrocoagulation, separating the coagulated and flocculated contaminants with eluted ions from electrodes [21]. Electro-oxidation can be defined as an electrochemical reaction involving direct oxidation on the anodes or indirect oxidation using by-products such as hypochlorite (HOCl), and is an invaluable method for the removal of soluble contaminants [16,22].…”

Section: Introductionmentioning

confidence: 99%

Electrolyte Addition for Enhanced Wastewater Treatment by Electrolysis using Cu Electrode

Kim

Yun

Son

et al. 2017

Journal of Electrochemical Science and Technology

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In this study, the effect of electrolyte addition on the removal of organics and nutrients in electrochemical wastewater using a copper electrode, and the characteristics of the by-product of electrolysis were investigated. The removal of organics increased significantly as shorter reaction times upon the addition of chloride ion, and most of the electrolysis reaction was completed within 20 min. The reaction rate gradually increased in proportion to the Cl -/COD ratio, whereas the highest removed mass of organic matter per mass of added electrolyte was observed at a Cl -/COD ratio of 1. After the addition of electrolyte, significant removal of ammoniacal nitrogen was observed as a result of the enhanced generation of oxidizers such as hypochlorite. Excellent phosphorus removal was also achieved in a very short reaction time (within 2 min) by electro-coagulation. As the electrolysis progressed, the amount of by-product increased gradually, whereas a decrease of sludge volume index was observed after the addition of electrolyte. This indicated that the settling performance of the by-products was better, and their removal would be easily achieved.

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“…The success of the basics AOP lies in their ability to produce hydroxyl radicals (HO • ), through the use of H2O2, Fe +2 , UV, O3, or O3/UV, and heterogeneous photocatalysis by TiO2 (Primo et al, 2008;Deng & Englehardt, 2007). The utilization of H2O2/Fe +2 /UV or H2O2/Fe +2 is considered highly important in homogeneous catalysis in AOPs that are used in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Treatment of seawater for rotifer culture uses applying adsorption and advanced oxidation processes

Poblete-Chávez

Cortés-Pizarro

Rojas-Araya

2016

lajar

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ABSTRACT. The use of live feed is common in aquaculture processes due to its nutritional advantages, and rotifers comprise one of the most used feeds in finfish aquaculture. However, bacteria present in water used for rotifer culture are a significant source of infection and consequently diseases could cause mortality in fishes. Advanced oxidation process (AOPs) are methods that may be useful to eliminate bacterial infections present in aquaculture wastewater and may allow the reuse of this water. Therefore, the prospect of using different advanced oxidation processes to inactivate Vibrio spp. and total bacteria cultures (TCB) present in this kind of water was evaluated. In particular, UVc/O3/H2O2, UVc/H2O2 and O3/H2O2 and the adsorption process were applied to seawater coming from a fish farming tank. The results obtained were highly promising because it was possible to inactivate 100% of bacteria present in the seawater when UVc/ozone/hydrogen peroxide and UVc/hydrogen peroxide were applied, needing around 20 and 80 min for Vibrio spp. and total culturable bacteria inactivation, respectively. These results are justified due to the strong action between H2O2 in the presence of UVc, which may produce a large amount of hydroxyl radicals. Nevertheless, when ozone/hydrogen peroxide was applied, total inactivation of bacteria did not occur. Also, an interesting relationship between bacteria inactivation and oxide reduction potential of seawater was observed during the process. Rotifers put in water after the treatment did not suffer behavior changes (swimming) and no mortalities were observed. Keywords: rotifers, bacteria, UV irradiation, ozone, hydrogen peroxide, aquaculture.Tratamiento de agua de mar para el cultivo de rotíferos mediante procesos de adsorción y oxidación avanzados RESUMEN. El uso de organismos vivos como alimento es común en la acuicultura, debido a sus ventajas nutricionales. Los rotíferos constituyen uno de los alimentos principales en el cultivo de peces. Sin embargo, las bacterias presentes en aguas utilizadas en el cultivo de rotíferos son una fuente importante de infección y pueden causar enfermedades y mortalidad en peces. Los procesos de oxidación avanzados son métodos útiles para eliminar bacterias presentes en aguas residuales de la acuicultura, permitiendo su reutilización. Se evaluó la inactivación de Vibrio spp. y bacterias cultivables totales presentes en aguas residuales de la acuicultura a través procesos de oxidación avanzados. Particularmente, se estudió la aplicación de UVc/O3/H2O2, UVc/H2O2 y O3/H2O2 junto a procesos de adsorción aplicados a agua proveniente de un estanque de cultivo de peces. Los resultados obtenidos son muy prometedores debido a que fue posible inactivar el 100% de bacterias presentes cuando se utilizó UVc/O3/H2O2 y UVc/H2O2, requiriendo 20 y 80 min para la inactivación de Vibrio spp. y bacte- __________________ Corresponding editor: Ricardo Prego 780Latin American Journal of Aquatic Research rias cultivables totales, respectivamente. Estos resultados se expl...

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Electrochemical oxidation for landfill leachate treatment

Cited by 330 publications

References 47 publications

Leachate Characterization and Leachate Pollution Index from Landfill Dump Sites in Warri Metropolis, Nigeria

Leachate Characterization and Leachate Pollution Index from Landfill Dump Sites in Warri Metropolis, Nigeria

Electrolyte Addition for Enhanced Wastewater Treatment by Electrolysis using Cu Electrode

Treatment of seawater for rotifer culture uses applying adsorption and advanced oxidation processes

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