International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 481 TREATABILITY STUDY OF LEACHATE BY FENTON OXIDATION Santhra Joseph 1 , Rashma Shetty 2 1 P.G. Student, Department of Studies in Civil Engineering, U.B.D.T. College of Engineering, Davanagere, Karnataka,India 2 Assistant Professor, Department of Studies in Civil Engineering, U.B.D.T. College of Engineering, Davanagere, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Leachate generation is a major problem faced by the landfill sites, also during collection and transport creating problem to public health and environment. In the present study, treatability study of fresh leachate by Fenton oxidation method was carried out. The optimum conditions were found at pH 2.5, FeSO4 dosage 1.5 g/l, H2O2 dosage 3 ml/l and reaction time of 40 minutes with the best removal of about 99.1%, 86.3%, 85.1% and 99.3% for Turbidity, Hardness, COD and Colour were obtained respectively. Thus Fenton oxidation was proved to be a feasible and cost effective method to treat leachate. Key Words: Leachate, Fenton process, Hydrogen peroxide, Ferrous Sulphate, COD and Colour removal. 1. INTRODUCTION Urbanization, commercial and industrial magnification along with population growth has led to an increase in waste generation worldwide. Landfilling is the economical feasible method for the disposal of solid waste. The unpreventable drawback associated with landfill disposal is the generation of leachate an aqueous liquid with offensive odour and dark colour, produced due to physico-chemical and biological degradation of waste and seepage of precipitation through the compacted cells [1]. Leachate composition varies with time and area, also depends on the nature of waste disposed, landfill age, climate, infiltration rate. Leachate is also produced during collection and transfer of solid waste also from compost piles of waste. Leachate consist of organic and inorganic matter, heavy metals inorganic salts etc. leachate cause severe environmental impacts such as soil, ground and surface water contamination which directly or indirectly effect humans health and environment. Hence it is a major challenge to treat and dispose the leachate generated [2]. Young leachate usually have high biodegradability can be treated by biological process. The older leachate have lower biodegradability with high refractory compounds can’t be treated using biological method [3]. Advanced oxidation process (AOP) is a better alternative for biological treatment. AOP is used widely wastewater where hydroxyl free radicals which act as strong oxidant, is used to destroy the impurities. The hydroxyl radicals once produced will vigorously attack the organic compounds. Fenton oxidation is one among the AOP which is very cost effective and easiest method. Fenton oxidation was invented by H.J.H Fenton in ͳͺͻͶ. The Fenton’s reagents used for oxidation process are hydrogen peroxide as a strong oxidant and ferrous ion as catalyst. Fenton oxidation is often used for industrial waste water which is highly toxic such as waste from dye, rubber chemical, pesticide, pharmaceutical etc [4]. The following reaction describes the Fenton oxidation mechanism: Fe 2+ + H2O2 Fe 3+ + • OH +OH (1) Fe 3+ + H2O2 Fe 2+ +HO • 2 +H (2) • OH + RH RH + H2O (3) R • + Fe 3+ Fe 2+ + R + (4) Fenton oxidation is also used as an effective pretreatment for biological methods since it improves the quality of leachate. In the present work efficiency of Fenton oxidation to treat fresh leachate was studied. 2. MATERIALS AND METHODOLOGY 2.1 Sample Collection The leachate for the present experimental study was collected from Pachchanady Compost Plant near Vamanjor in Mangalore. The sample was kept in refrigerator at about 4° C. The initial characterization of leachate was conducted as per standard method (APHA). 2.2 Materials and Reagents Used The reagents used for Fenton oxidation are hydrogen peroxide and ferrous sulphate. HCL and NaOH were used for pH adjustment. Fenton oxidation was carried out in 1000 ml beaker using jar test apparatus. 2.3 Experimental Procedure The oxidation process consists of four succeeding stages - pH adjustment, oxidation reaction, neutralization and coagulation and finally precipitation. The oxidation process was performed in glass beakers of 1 liter capacity. About 500 ml of sample was taken in the beaker and the pH of the sample was adjusted to acidic range using HCL. A weighed quantity of Fe 2+ was added to the sample followed by the addition of required dose of H2O2. The sample was stirred using jar test apparatus at a constant speed. The pH was set to 7 after required time to initiate coagulation. The supernatant obtained was collected and taken for analysis.