Performance of Electrochemical Processes in the Treatment of Reverse Osmosis Concentrates of Sanitary Landfill Leachate

Electrochemical technologies have been broadly applied in wastewaters treatment, but few studies have focused on comparing the performance of the different electrochemical processes, especially when used to treat highly-polluted streams. The electrochemical treatment of a reverse osmosis concentrate of sanitary landfill leachate was performed by means of electrocoagulation (EC), anodic oxidation (AO) and electro-Fenton (EF) processes, and the use of different electrode materials and experimental conditions was assessed. All the studied processes and experimental conditions were effective in organic load removal. The results obtained showed that EC, with stainless steel electrodes, is the cheapest process, although it presents the disadvantage of sludge formation with high iron content. At high applied current intensity, AO presents the best treatment time/energy consumption ratio, especially if the samples’ initial pH is corrected to 3. However, pH correction from natural to 3 deeply decreases nitrogen-containing compounds’ removal. For longer treatment time, the EF process with a carbon-felt cathode and a BDD anode, performed at natural iron content and low applied current intensity, is the most favorable solution.

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Sanitary landfill leachate as a source of nutrients on the initial growth of sunflower plants

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v20n8p746-750 ◽

2016 ◽

Vol 20 (8) ◽

pp. 746-750 ◽

Cited By ~ 1

Author(s):

Francisco H. Nunes Júnior ◽

Franklin A. Gondim ◽

Magnum de S. Pereira ◽

Brennda B. Braga ◽

Roberto A. Pontes Filho ◽

...

Keyword(s):

Landfill Leachate ◽

Polynomial Regression ◽

Inhibitory Effect ◽

Sanitary Landfill ◽

Initial Growth ◽

Experimental Conditions ◽

Shoot Height ◽

Number Of Leaves ◽

Collar Diameter ◽

Sanitary Landfill Leachate

ABSTRACT The aim of this study was to evaluate the initial growth of sunflower seedlings under different concentrations of sanitary landfill leachate, considering the feasibility of its use as source of nutrients for agricultural production. Biometric and vigor variables were analyzed through the measurements of collar diameter, shoot height, number of leaves and shoot and root fresh and dry matters, from January to February 2015. The experimental design was completely randomized in a 5 x 4 factorial scheme: five leachate concentrations (0, 40, 60, 80 and 100 kg N ha-1) x four harvest periods (14, 21, 25 and 29 days after sowing), with five replicates each containing two plants. The data were subjected to analysis of variance and polynomial regression, and the results of the last harvest (29 DAS) were compared by Tukey test (p ≤ 0.05). The use of sanitary landfill leachate increased all analyzed variables in sunflower plants when compared to the control plants (without leachate), especially in the treatment of 100 kg N ha-1. There was no inhibitory effect of the leachate on the initial growth of sunflower seedlings under adopted experimental conditions.

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Electro-Fenton oxidation of reverse osmosis concentrate from sanitary landfill leachate: Evaluation of operational parameters

Chemosphere ◽

10.1016/j.chemosphere.2017.06.088 ◽

2017 ◽

Vol 184 ◽

pp. 1223-1229 ◽

Cited By ~ 29

Author(s):

Annabel Fernandes ◽

Lazhar Labiadh ◽

Lurdes Ciríaco ◽

Maria José Pacheco ◽

Abdellatif Gadri ◽

...

Keyword(s):

Reverse Osmosis ◽

Landfill Leachate ◽

Fenton Oxidation ◽

Sanitary Landfill ◽

Operational Parameters ◽

Sanitary Landfill Leachate

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Electrochemical treatment of concentrate from reverse osmosis of sanitary landfill leachate

Journal of Environmental Management ◽

10.1016/j.jenvman.2016.06.069 ◽

2016 ◽

Vol 181 ◽

pp. 515-521 ◽

Cited By ~ 37

Author(s):

Lazhar Labiadh ◽

Annabel Fernandes ◽

Lurdes Ciríaco ◽

Maria José Pacheco ◽

Abdellatif Gadri ◽

...

Keyword(s):

Reverse Osmosis ◽

Landfill Leachate ◽

Electrochemical Treatment ◽

Sanitary Landfill ◽

Sanitary Landfill Leachate

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Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate

Applied Sciences ◽

10.3390/app11115009 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5009

Author(s):

Mayk Teles de Oliveira ◽

Ieda Maria Sapateiro Torres ◽

Humberto Ruggeri ◽

Paulo Scalize ◽

Antonio Albuquerque ◽

...

Keyword(s):

Heavy Metals ◽

Landfill Leachate ◽

Lower Cost ◽

Sanitary Landfill ◽

Leachate Treatment ◽

Removal Of Heavy Metals ◽

Waste Characteristics ◽

Electrode Passivation ◽

Steel Swarf ◽

Sanitary Landfill Leachate

Sanitary landfill leachate (LL) composition varies according to climate variables variation, solid waste characteristics and composition, and landfill age. Leachate treatment is essentially carried out trough biological and physicochemical processes, which have showed variability in efficiency and appear a costly solution for the management authorities. Electrocoagulation (EC) seems a suitable solution for leachate treatment taking into account the characteristics of the liquor. One of the problems of EC is the electrode passivation, which affects the longevity of the process. One solution to this problem could be the replacement of the electrode by one made of recyclable material, which would make it possible to change it frequently and at a lower cost. The objective of the present work was to evaluate the removal of heavy metals (As, Ba, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Se and Zn) and coliforms from a LL by EC using electrodes made from steel swarf (SfE) up to 8 h. Removal efficiencies of detected heavy metals were 51%(Cr), 59%(As), 71%(Cd), 72%(Zn), 92%(Ba), 95%(Ni) and >99%(Pb). The microbial load of coliforms in leachate was reduced from 10.76 × 104 CFU/mL (raw leachate) to less than 1 CFU/mL (after treatment with SfE) (i.e., approximately 100% reduction). The use of SfE in EC of LL is very effective in removing heavy metals and coliforms and can be used as alternative treatment solution for such effluents.

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Resistance of bacteria isolated from leachate to heavy metals and the removal of Hg by Pseudomonas aeruginosa strain FZ-2 at different salinity levels in a batch biosorption system

Sustainable Environment Research ◽

10.1186/s42834-021-00088-6 ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Muhammad Fauzul Imron ◽

Setyo Budi Kurniawan ◽

Siti Rozaimah Sheikh Abdullah

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Pseudomonas Aeruginosa ◽

Fresh Water ◽

Landfill Leachate ◽

Saline Water ◽

Resistant Bacteria ◽

Sanitary Landfill ◽

Salinity Levels ◽

Sanitary Landfill Leachate

AbstractLeachate is produced from sanitary landfills containing various pollutants, including heavy metals. This study aimed to determine the resistance of bacteria isolated from non-active sanitary landfill leachate to various heavy metals and the effect of salinity levels on the removal of Hg by the isolated bacterium. Four dominant bacteria from approximately 33 × 1017 colony-forming units per mL identified as Vibrio damsela, Pseudomonas aeruginosa, Pseudomonas stutzeri, and Pseudomonas fluorescens were isolated from non-active sanitary landfill leachate. Heavy metal resistance test was conducted for Hg, Cd, Pb, Mg, Zn, Fe, Mn, and Cu (0–20 mg L− 1). The removal of the most toxic heavy metals by the most resistant bacteria was also determined at different salinity levels, i.e., fresh water (0‰), marginal water (10‰), brackish water (20‰), and saline water (30‰). Results showed that the growth of these bacteria is promoted by Fe, Mn, and Cu, but inhibited by Hg, Cd, Pb, Mg, and Zn. The minimum inhibitory concentration (MIC) of all the bacteria in Fe, Mn, and Cu was > 20 mg L− 1. The MIC of V. damsela was 5 mg L− 1 for Hg and > 20 mg L− 1 for Cd, Pb, Mg, and Zn. For P. aeruginosa, MIC was > 20 mg L− 1 for Cd, Pb, Mg, and Zn and 10 mg L− 1 for Hg. Meanwhile, the MIC of P. stutzeri was > 20 mg L− 1 for Pb, Mg, and Zn and 5 mg L− 1 for Hg and Cd. The MIC of P. fluorescens for Hg, Pb, Mg, and Zn was 5, 5, 15, and 20 mg L− 1, respectively, and that for Cd was > 20 mg L− 1. From the MIC results, Hg is the most toxic heavy metal. In marginal water (10‰), P. aeruginosa FZ-2 removed up to 99.7% Hg compared with that in fresh water (0‰), where it removed only 54% for 72 h. Hence, P. aeruginosa FZ-2 is the most resistant to heavy metals, and saline condition exerts a positive effect on bacteria in removing Hg.

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