Efficiency of Combined Processes Coagulation/Solar Photo Fenton in the Treatment of Landfill Leachate

Liceth P. Rebolledo,Jorge Trilleras,Arturo J. González-Solano,Henry Maury-Ardila,Victoria A. Arana,Gustavo E. Barros

doi:10.3390/w11071351

Liceth P. Rebolledo, Jorge Trilleras + Show 4 more

Open Access

https://doi.org/10.3390/w11071351

Copy DOI

Journal: Water	Publication Date: Jun 29, 2019
Citations: 7	License type: CC BY 4.0

Affiliation: University of Atlántico, University of the Coast

Abstract

The combined coagulation-solar photo Fenton treatment of leachate from the sanitary landfill located in Atlantico-Colombia was investigated. Firstly, the efficiency of two alternative combined treatments for the reduction of chemical oxygen demand in leachate was assessed, coagulation with poly-aluminum chloride followed by solar photo-Fenton process (Treatment 1) and coagulation with FeCl3·6H2O followed by ferrioxalate-induced solar photo-Fenton process (Treatment 2). Afterwards, treatments 1 and 2 were compared with the treatment currently used in the sanitary landfill (only coagulation with poly-aluminum chloride), in terms of efficiency and costs. An optimization study of alternative treatments was performed combining central-composite experimental design and response surface methodology. The optimum conditions resulted in a chemical oxygen demand reduction of 73 % and 80 % for Treatment 1 and 2, respectively. Both alternative treatments for the leachate are more efficient than the treatment currently used in the sanitary landfill (chemical oxygen demand reduction of 20 %). In terms of costs, treatment 1 would be the most competitive to implement in the sanitary landfill, since this would have an increase of 13.3 % in the total unitary cost compared to an increase of 39.5 % of treatment 2.

Highlights

Modern anthropic activity generates large amounts of solid waste
The objectives of this study were: (1) Optimize treatment 1: coagulation/sedimentation using poly-aluminum chloride (PAC) followed by solar photo-Fenton process for landfill leachate using central-composite experimental design, (2) Optimize treatment 2: coagulation/sedimentation using FeCl3 ·6H2 O followed by ferrioxalate-induced solar photo-Fenton process for landfill leachate using central-composite experimental, (3) Compare treatments 1 and 2 with the treatment carried out in the sanitary landfill located in the Atlantico department-Colombia, in terms of efficiency and costs
Two different combinations of processes were performed: (i) Treatment 1: coagulation/sedimentation using PAC followed by solar photo-Fenton process and (ii) Treatment 2: coagulation/sedimentation using FeCl3 ·6H2 O followed by ferrioxalate-induced solar photo-Fenton process, to evaluate the efficiency of removal organic matter, carried out in a lab-scale photoreactor

Summary

Introduction

Modern anthropic activity generates large amounts of solid waste. Sanitary landfills are a strategic option for waste treatment. The leachate has high variability in its composition and quantity and contains recalcitrant substances, such as humic and fluvic acids, xenobiotics, pesticides, heavy metals and inorganic salts [2] Many of these pollutants are present in high concentrations, the leachate is classified as one of the most complex and difficult substances to treat as it requires rigorous management and control. It depends on the age of the landfill, climatic conditions, soil properties, type and composition of waste [3].

Objectives

Results

Conclusion