Evaluation of the efficiency of electrocoagulation process in removing cyanide, nitrate, turbidity, and chemical oxygen demand from landfill leachate

Author:

Amouei Abdoliman12ORCID,Pouramir Mehdi3ORCID,Asgharnia Hosseinali12ORCID,Mehdinia Mahmoud12ORCID,Shirmardi Mohammad12ORCID,Fallah Hourieh12ORCID,Khalilpour Asieh12ORCID,Tabarinia Hajar4ORCID

Affiliation:

1. Environmental Health Research Center (EHRC), Social Determinants of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran

2. Environmental Health Department, Babol University of Medical Sciences, Babol, Iran

3. Clinical Biochemistry Department, Babol University of Medical Sciences, Babol, Iran

4. Water Wastewater Chemistry Laboratory, Environmental Health Department, Babol University of Medical Sciences, Babol, Iran

Abstract

Background: Leachate contains toxic and non-biodegradable substances that are not easily treated by conventional treatment methods. This study investigated the effect of pH, current density, and reaction time parameters on the removal of cyanide (CN- ), nitrate (NO3- ), turbidity, and chemical oxygen demand (COD) from leachate by electrocoagulation process. Methods: This study was an experimental one with direct current using four parallel bipolar aluminum electrodes with 90% purity. The length, width, and thickness of the electrodes were 5 cm, 10 cm, and 2 mm, respectively. There were 6 holes with a diameter of 0.7 cm on each of the electrodes. The samples were prepared from the old leachate of solid waste landfill in Ghaemshahr, Iran. Results: In this study, at a current density of 33 mA/cm2 and a time of 60 minutes, the optimum removal efficiency of cyanide (100 %) was obtained at pH 5.5 and pH 10. Moreover, the maximum removal of nitrate (99.65 %) and turbidity (86.41 %) were at pH 5.5 and pH 8.3, respectively and the highest removal efficiency of COD (83.14 %) was obtained at pH 10. Conclusion: The results showed that the removal of cyanide, nitrate, turbidity, and COD increases with increasing current density and reaction time. Due to the proper removal of nitrate and cyanide from leachate by electrocoagulation, nitrate and cyanide amounts were less than the allowable contamination level. Based on the results, electrocoagulation is considered an efficient and effective method for removing nitrate and cyanide from old leachate of municipal solid wastes.

Publisher

Maad Rayan Publishing Company

Subject

Chemical Health and Safety,Public Health, Environmental and Occupational Health,General Environmental Science

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