THE USE OF OZONE FOR TREATMENT OF LANDFILL LEACHATE IN COMBINATION WITH USUAL MICROBIOLOGICAL PROCESSES

ANDINI, JUAN CARLOS; LOVATO, MARIA EUGENIA; CARLOS MARTÍN; JOSE REAL

Prague, Czech Republic

Congreso; 5th European Conference on June 25-29, 2017, Environmental Applications of Advanced Oxidation Processes; 2017

University of Chemistry and Technology, Prague, Czech Republic

The application of conventional physicochemical and microbiological techniques for the removal of organic pollutants has limitations for the use with wastewaters from certain industries (e.g., textile, paper mill, and winery) because the high proportion of non biodegradable organic carbon like those that cause coloration effects. Moreover, some wastewater as landfill leachate combine high values of DQO, TOC and toxicity with small relationships DBO/DQO [1,2]. Advanced Oxidation Processes (AOP) are considered to be suitable for treatment of this type of wastewater. Among then, the use of ozone based technologies still has some crucial problems that should be resolved to improve the efficiency as the mass transfer limitations, the small solubility of ozone, and the losses of not reacted ozone at the exit of the reactor [3]. This paper report the study of the degradation of landfill leachate with ozone and ozone + UV, using samples obtained from different stages of the treatment plant. The experimental work included the determination of the evolution of DQO, DBO, TOC, UV, toxicity. Furthermore, along the experimental runs the instantaneous ozone concentration in gas and liquid phases were measured. Also, using the combination of semi empirical kinetic expressions for the DQO and TOC evolution with different calculated ?ozone doses/ consumed ozone it is possible to define and compare efficiencies that include unreacted ozone as a new optimization variable.