International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 04 | Apr 2025
p-ISSN: 2395-0072
www.irjet.net
Treatment of landfill leachate by electrochemical oxidation for removal of color and chemical oxygen demand (COD) Dr. S. Kanmani1, Mr. C. Rishikesh2 1Head of Department, Department of Civil Engineering, Anna University, Chennai, Tamil Nadu, India
2Post Graduate Student, Centre for Environmental Studies, Department of Civil Engineering, Anna University,
Chennai, Tamil Nadu, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Electrochemical technologies, which use electrons to remove contaminants through redox reactions, can provide an elegant contribution to environmental control. The primary goal of electrochemical oxidation has been to produce carbon dioxide from oxidizable molecules. Leachate is a complicated effluent that comes from landfills and has the potential to have a significant influence on the environment. In order to comply with inland disposal regulations, this study attempts to treat the landfill leachate. In an electrochemical method, the removal of contaminants was investigated using various anode materials. In a batch electrolytic parallel plate reactor, leachate from two different packages were treated by electrochemical oxidation. The electrochemical process was carried out individually, using graphite as cathode and anode electrodes. The effects of the operating factors such as current density, Dilution factor, reaction time, chloride ion concentration that influence the removal of pollutant from Leachate electrochemically were studied.
Key Words: contaminants; electrochemical oxidation; electrodes; Landfill leachate; redox 1.INTRODUCTION Ai wabel et al.., (2011) said that the Landfill leachate is an important pollution source originated in municipal landfill sites. Landfill leachate is defined as those aqueous streams generated as a consequence of rainwater percolation through wastes, biochemical processes in the waste’s cells and the inherent water content of the wastes themselves. Leachates may contain large amounts of organic matter, of which humic type constituents are an important group, as well as ammonia- nitrogen, heavy metals and chlorinated organic and inorganic salts. Rajan Gandhimathi et al., (2013) discussed that the discharge of landfill leachate can lead to serious environmental problems as they may percolate through soils and sub soils, causing extensive pollution of ground and surface waters if they are not properly treated and safely disposed. Leachate becomes ahead of wastewaters as being the most difficult to treat as it is a wastewater with a complex and widely variable content generated within a landfill. Therefore, many pre-treatment and combined treatment methods have been proven to treat leachate .Yun nen chen et al.., (2012) discussed that the type of leachate depends on factors such as age and type of landfill, pH, and BOD5/COD ratio.
2. ELECTROCHEMICAL OXIDATION Huankai li et al., (2023) investigated that due to its effectiveness and ease in operation, electrochemical oxidation process has recently received significant attention for wastewater treatment. The process has shown its efficacy for the destruction of refractory pollutants such as cyanide and EDTA, and also for colour removal. In general, pollutants can be destroyed electrochemically by direct anodic oxidation or by indirect oxidation Many researchers have investigated the electrochemical oxidation of different wastewaters with various types of compounds. These include textile wastewater, p-chlorophenol and p nitrophenol phenolic wastewater and Tanyolac, olive oil wastewater tannery wastewater et al., and paint wastewater. Xianni song et al..,(2023) discussed that the treatment of CLBE by EO with Ti/RuO2-IrO2 as the anode can achieve concomitantly organic carbon removal (COD) and nitrogen removal (NH3-N). The statistical analysis revealed that current density, A/V, and Clconcentration were significantly and positively correlated with the removal of COD, NH3-N and TN, while d showed a nonmonotonic effect on them. The initial pH showed a non-monotonic effect on the removal of COD that was first weakened and then promoted, and was significantly and positively correlated with the removal of NH3- N and TN. 17 Panizza et al., (2023) discussed that in all anodes except graphite, ammonium removal dominated over organic oxidation. A Ti/PbO2 anode is found as a better anode than Ti/Ru-SnO2 though BDD showed best performance among the three anodes for both COD and ammonium removal as well as in terms of current efficiency and operating cost. Nidhesh et al., (2023) said that Leachate treatment using electrochemically activated persulfate by externally added ferrous ions into the leachate system have been carried out effectively. The treatment processes include anodic oxidation of Pt/ Ti, sulphate
© 2025, IRJET
|
Impact Factor value: 8.315
|
ISO 9001:2008 Certified Journal
|
Page 1030