P Kirmizakis1, C Tsamoutsoglou2, B Kayan3, D Kalderis4. 1. Department of Environmental and Natural Resources Engineering, School of Applied Sciences, Technological and Educational Institute of Crete, Chania, Crete 73100, Greece. 2. DEDISA S.A., Chania, Crete 73100, Greece. 3. Department of Chemistry, Arts and Sciences Faculty, Aksaray University, Aksaray, Turkey. 4. Department of Environmental and Natural Resources Engineering, School of Applied Sciences, Technological and Educational Institute of Crete, Chania, Crete 73100, Greece. Electronic address: dkalderis@yahoo.com.
Abstract
CONTEXT: Leachate is the liquid formed when waste breaks down in the landfill and water filters through that waste. This liquid is highly toxic and can pollute the land, ground water and water ways. It is mandatory for landfills to protect against leachate in most countries worldwide. Controlling the pollutant loading, means reducing its quantity by containing or treating the waste to comply with certain discharge characteristics which are compatible with the receptor medium. OBJECTIVE: This paper describes the reduction of the organic load of a mature landfill leachate using a novel experimental set-up that employs hydrogen peroxide under subcritical conditions and aims to establish this method as an effective alternative to currently used options. Response surface methodology was applied to optimize the treatment process and determine which of the following there parameters - temperature, residence time and hydrogen peroxide concentration - played the most important role. METHOD: The method employed is based on the use of laboratory-scale, stainless steel reactors, filled with the leachate and appropriate quantities of hydrogen peroxide. Under subcritical conditions (temperature in the range of 100-374 °C and enough pressure to maintain the liquid state of water), hydrogen peroxide produces hydroxyl radicals which are highly reactive and oxidize the organic molecules of the leachate. RESULTS: The highest COD decrease of 85% was experimentally observed at 300 °C, 500 mM H2O2 and 180 min residence time. It was determined that the combination of oxidant concentration and temperature is the rate-determining factor, whereas residence time has a lesser effect on the process. CONCLUSIONS: A simple, quick, effective and environmentally-friendly method for the treatment of the organic load of landfill leachate was developed and optimized at laboratory scale.
CONTEXT: Leachate is the liquid formed when waste breaks down in the landfill and water filters through that waste. This liquid is highly toxic and can pollute the land, ground water and water ways. It is mandatory for landfills to protect against leachate in most countries worldwide. Controlling the pollutant loading, means reducing its quantity by containing or treating the waste to comply with certain discharge characteristics which are compatible with the receptor medium. OBJECTIVE: This paper describes the reduction of the organic load of a mature landfill leachate using a novel experimental set-up that employs hydrogen peroxide under subcritical conditions and aims to establish this method as an effective alternative to currently used options. Response surface methodology was applied to optimize the treatment process and determine which of the following there parameters - temperature, residence time and hydrogen peroxide concentration - played the most important role. METHOD: The method employed is based on the use of laboratory-scale, stainless steel reactors, filled with the leachate and appropriate quantities of hydrogen peroxide. Under subcritical conditions (temperature in the range of 100-374 °C and enough pressure to maintain the liquid state of water), hydrogen peroxide produces hydroxyl radicals which are highly reactive and oxidize the organic molecules of the leachate. RESULTS: The highest COD decrease of 85% was experimentally observed at 300 °C, 500 mM H2O2 and 180 min residence time. It was determined that the combination of oxidant concentration and temperature is the rate-determining factor, whereas residence time has a lesser effect on the process. CONCLUSIONS: A simple, quick, effective and environmentally-friendly method for the treatment of the organic load of landfill leachate was developed and optimized at laboratory scale.
Authors: Mohamad Anuar Kamaruddin; Mohd Suffian Yusoff; Lo Ming Rui; Awatif Md Isa; Mohd Hafiz Zawawi; Rasyidah Alrozi Journal: Environ Sci Pollut Res Int Date: 2017-10-25 Impact factor: 4.223