Post-treatment of Composting Leachate by Photocatalytic Process

In this study the capability of UV-ZnO photocatalytic process as a post Treatment method for composting leachate was examined at laboratory scale and in batch mode. The effect of some factors such as initial pH, oxidant concentration, light intensity and reaction time on the removal of organic load and color of leachate were investigated. Biological pre-treated leachate samples were collected from the effluent of leachate treatment facility of a composting plant in north of Iran. A Plexiglas column with 110 mm inner diameter and 300 mm height were used to conduct experiments. UVC lamps with different power levels in the range of 8-40W at the centre of the column were used as the source of irradiation. Based on the results of experiments, after 180 minutes of Radiation with 32W UVC lamps in pH 11 and in the presence of 1g.L-1 of slurry ZnO, maximum COD and color removal were achieved to be 57% and 67%, respectively.

Industrial and economic development over recent decades in most countries along with changes in lifestyle has resulted in considerable growth of industrial and householdwaste. In 1994, the amount of solid waste production was 1.3 billion tons/year, where it has amounted to 1.7 billion tons/year in 2004, indicating a 31% increase. The amount of waste production in Asia in 1998 was also 0.76 Million ton per day. Since biodegradable organic materials constitute approximately 60% of the total urban solid waste in developing countries, leachate treatment is considered as a big concern for waste management in these areas. leachate treatment methods are classified into three groups include: leachate transmission; biodegradation techniques and physiochemical treatment methods. Due to its reliability, simplicity and high cost-effectiveness, biological processes are among conventional methods used for immature leachate treatment. However, due to high organic load of leachate and also presence of refractory pollutants, biological process alone cannot remove all of the organic matters from leachate. In order to enhance the quality of leachate to the discharge standards, post treatment of biologically treated leachate is required. One appropriate solution for complementary treatment of leachate and removal of refractorymaterials is application of photocatalytic processes. This process is mainly dependent on the in-situ generation of hydroxyl radicals under ambient conditions which are capable of converting a wide spectrum of organic compounds into relatively innocuous final products such as CO2 and H2O. Use of photocatalytic methods has attracted great deal of attention thanks to its unique features including full decomposition of contaminantto water and carbon dioxide, simple implementation, reusable materials, and quick removal of pollutants.



Copyright: © Wasteconsult International
Quelle: Waste-to-Resources 2015 (Mai 2015)
Seiten: 12
Preis inkl. MwSt.: € 6,00
Autor: Dr Nader Mokhtarani
Alireza Ranjbari

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