Electrochemical removal of pollutants from agro-industry wastewaters

Drogui, Patrick; Asselin, Mélanie; Brar, Satinder Kaur; Benmoussa, H.; Blais, Jean‐François

doi:10.1016/j.seppur.2007.10.013

Cited by 145 publications

(60 citation statements)

References 23 publications

(26 reference statements)

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“…In addition, changes in pH can alter the surface load of particles and this can affect the removal of organic materials dispersed in wastewater (22).…”

Section: +2mentioning

confidence: 99%

The Effect of Initial pH on Pistachio Processing Industrial Wastewater Pre-treatment by Electrocoagulation Method

Bayar¹,

Yılmaz²,

Köksal³

et al. 2015

Proceedings of the 2015 International Conference on Sustainable Energy and Environmental Engineering

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Abstract-In this study, removal of chemical oxygen demand (COD) and total phenols (TP) from pistachio processing industry wastewater was investigated using electrocoagulation method. COD and TP removal efficiencies were compared considering wastewater initial pH by using stainless steel cathodes and aluminum anodes. To determine the effect of initial pH on removal efficiency, 4, 5.2 (original wastewater pH), 6 and 7 pH were investigated. Results showed that optimum values of operating variables wastewater initial pH was 5.2 for COD removal efficiency and 7 for TF removal efficiency. Removal of COD of pH 5.2 up has increased. Removal of COD began to decrease at higher pH values than the original pH value. TF removal efficiency increased with increasing pH. The pH values at the obtained the highest energy consumption value was the original pH. The energy consumption value were decreased above and below the original pH value. The highest removal efficiencies for COD and TF were %60 and %95, respectively under operating conditions as 25 ml/min flow rate and 20 A current intensity.

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“…In addition, changes in pH can alter the surface load of particles and this can affect the removal of organic materials dispersed in wastewater (22).…”

Section: +2mentioning

confidence: 99%

The Effect of Initial pH on Pistachio Processing Industrial Wastewater Pre-treatment by Electrocoagulation Method

Bayar¹,

Yılmaz²,

Köksal³

et al. 2015

Proceedings of the 2015 International Conference on Sustainable Energy and Environmental Engineering

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“…Ces résultats sont proches de ceux rapportés par CAMILLERI (1980) et DROGUI et al (2007. Donc le temps de contact optimal est 25 min.…”

Section: Caractérisation Des Effluents D'abattoir De Viande Rougeunclassified

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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“…There are different methods for the separation of PAHS: the thermal treatment of polycyclic aromatic hydrocarbons under controlled conditions is one of the more effective methods of degradation (Eriksson et al, 2003;Summers and Snoeyink, 1999;Rajeshwar et al, 1994;Golder et al, 2007), adsorption or sorption (Arlette et al, 2012;Drogui et al, 2007;Ebubekir et al, 2013), direct photolysis , and electrocoagulation (Pons et al, 2005;Emamjomeh and Sivakumar, 2009;Mohd Salleh et al, 2011;Kliaugaitė et al, 2013).…”

Section: Introductionmentioning

confidence: 99%