Indirect oxidation effect in electrochemical oxidation treatment of landfill leachate

Chiang, Li Choung; Chang, Juu‐En; Wen, Ten‐Chin

doi:10.1016/0043-1354(94)00146-x

Cited by 433 publications

(260 citation statements)

References 17 publications

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“…À 4 V, 27,5 % d'azote total est éliminé. L'abattement maximal est 76,2 % à 12 V. L'azote est aussi éliminé sous forme inorganique par oxydation des ions NH 4 + et formation des chloramines et d'azote gazeux (CHIANG et al, 1995) et (COSSU et al, 1998) (cité par LABANOWSKI,2004.…”

Section: Azote Totalunclassified

Traitement des effluents d’abattoir de viande rouge par électrocoagulation-flottation avec des électrodes en fer

Khennoussi

Chaouch

Chahlaoui

2013

rseau

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L’effluent de l’abattoir municipal de la ville de Meknès est caractérisé par une forte charge organique polluante et une coloration rouge due à la concentration élevée en sang. Les analyses physicochimiques et microbiologiques ont révélé des concentrations importantes en paramètres globaux de pollution, et une charge microbiologique marquée par la dominance des coliformes. La demande chimique en oxygène (DCO) moyenne est de 2 240 mg d’O2•L‑1. La concentration moyenne en azote total est de 290 mg•L‑1. Les orthophosphates sont à une concentration moyenne de 35 mg•L‑1. La matière extractible à l’hexane (MEH) varie entre 900 et 1 100 mg•L‑1. Les coliformes fécaux sont de 67•103 UFC•mL‑1.Le traitement par électrocoagulation-flottation utilisant des électrodes plates de fer, avec une tension électrique de 12 V et un temps de contact de 25 min, a donné de bons résultats. Il a permis l’abattement de 92,6 % de DCO, 76,2 % d’azote total, et 95,4 % des orthophosphates. Les MEH sont éliminées à 62,5 % grâce au phénomène de flottation favorisé par le dégagement des bulles d’hydrogène issues de la réduction de l’eau à la cathode, et le brassage de l’effluent par agitation dans la cellule électrolytique. Ce processus a permis également la décoloration de cet effluent, illustrée par une diminution de l'absorption à 450 nm supérieure à 90 %, et une diminution remarquable de l'absorbance UV à 254 nm, traduisant l’élimination de matière organique dissoute par des mécanismes d'oxydation électrochimiques. Les coliformes fécaux sont réduits de trois unités logarithmiques.The effluent of the municipal slaughterhouse in Meknes City, Morocco, is characterized by a high organic pollution load and red colour due to the high concentration of blood. Physicochemical and microbiological analyzes revealed significant levels of pollution and microbiological load marked by the dominance of coliform bacteria. The average chemical oxygen demand (COD) is 2,240 mg O2•L‑1. The average concentration of total nitrogen is 290 mg•L‑1 and that for orthophosphates is 35 mg•L‑1. Fat and grease content varies between 900 and 1,100 mg•L‑1. The number of fecal coliforms is 67•103 UFC•mL‑1. Treatment by electrocoagulation-flotation using iron plate electrodes, with a voltage of 12 V and a contact time of 25 min, gave good results. It can achieve reductions in chemical oxygen demand (COD) of 92.6%. Total nitrogen removal was 76.2%, and the reduction of orthophosphate was 95.4%. Fat and grease can be reduced by 62.5% thanks to the flotation step, favoured by the release of hydrogen bubbles from the reduction of water at the cathode and the mixing of the effluent by stirring in the electrolytic cell. This process also enabled the reduction of the red colour, as illustrated by the decrease in absorbance at 450 nm, a reduction exceeding 90%, and a remarkable decrease in UV absorbance at 254 nm, reflecting the removal of dissolved organic material by electrochemical oxidation mechanisms. Fecal coliforms are reduced by three logarithmic units

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Section: Azote Totalunclassified

Traitement des effluents d’abattoir de viande rouge par électrocoagulation-flottation avec des électrodes en fer

Khennoussi

Chaouch

Chahlaoui

2013

rseau

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“…Figure 7 shows how the activation energy can be calculated from the conversion rate ln(dX/dt) and 1/T in Equation (6).…”

Section: Kineticsmentioning

confidence: 99%

“…Composting can cause secondary contamination by heavy metals or organic matter. Heat treatments cause air pollution and generate ash [6,7]. Recently, various methods have been studied for food waste utilization.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Characteristics and Kinetics of Food Wastes

Kim

Shim

et al. 2017

Energies

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Abstract:Pyrolysis is an environmental friendly alternative method compared with incineration, and the least time-consuming and smallest infrastructure footprint method compared with bio-chemical and thermo-chemical conversion. Baseline data for the pyrolysis of food waste was obtained in a kinetic study of the thermal decompositions by thermogravimetric analysis. To simulate the difference in the types of food waste, the study was done using model compounds, such as cereals, meat, vegetable, and mixed food waste; the pyrolysis commenced at 150 • C for most food waste and the process terminated at 450 • C to 500 • C. Between one and three peaks were observed on a differential thermogravimetry (DTG) graph, depending on the type of waste being pyrolyzed, reflecting the difference in the time required for pyrolysis of different components of food waste to take place. Depending on the composition of each food, one or four peaks were found, and the pyrolysis patterns of carbohydrate, protein, fat, and cellulose were found. Activation energies and frequency factors were calculated from the rates of conversion, using differential equation analyses. The activation energy increased from 10 kJ/mol to 50 kJ/mol as conversions increased from the 10% to 90%, regardless of the food waste type. The activation energy was measured as 50 kJ/mol, with a slight variation among the type of the food waste. Due to the activation energy being low, food waste consists of carbohydrates and other substances rather than cellulose, hemicellulose, and lignin.

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“…In addition of some advantages in uses of bagasse for producing pulp, there are few practical complications in the form of collection and storing of bagasse due to its seasonal availability. Bagasse stored under wet condition by spraying water to preserve its quality, which uses large quantity of water and produce an effl uent called bagasse wastewater 5 . Discharge of this wastewater causes negative impact on receiving water bodies.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of chemical coagulation process to treat bagasse wastewater: modeling and optimization

Thirugnanasambandham¹,

Sivakumar

Kadaikunnan

2016

Polish Journal of Chemical Technology

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In this present study, chemical coagulation process (CC) treatment process was investigated under different conditions such as pH, ferric chloride dose, agitation time and settling time to treat bagasse wastewater using response surface methodology (RSM). The outcomes were evaluated using Pareto analysis of variance (ANOVA) and second order polynomial models were created with the aim of being able to predict the responses. Ideal conditions were observed to be as per the following: agitation time of 25 min, pH of 7, ferric chloride dose of 6 g/L and settling time of 60 min. Under these conditions, turbidity removal of 62%, COD removal of 67%, TDS removal 53% and sludge production of 32 mL/L were obtained with operating cost of 3.50 Rupee/L. The mechanism of CC was analyzed using XRD spectrum and founds to be adsorption.

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Indirect oxidation effect in electrochemical oxidation treatment of landfill leachate

Cited by 433 publications

References 17 publications

Traitement des effluents d’abattoir de viande rouge par électrocoagulation-flottation avec des électrodes en fer

Traitement des effluents d’abattoir de viande rouge par électrocoagulation-flottation avec des électrodes en fer

Pyrolysis Characteristics and Kinetics of Food Wastes

Performance evaluation of chemical coagulation process to treat bagasse wastewater: modeling and optimization

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