Municipal landfill leachates are considered one of the types of wastewater with the greatest environmental impact because of high concentrations of ammonium, salts and organic matter. Usually, recalcitrant pollutants and ammonia removals represent the steps of greatest concern. An innovative process based on ozone enhanced biological degradation, carried out in an aerobic granular biomass system (SBBGR - Sequencing Batch Biofilter Granular Reactor), was tested at lab-scale for treating a typical medium-age landfill leachate. The results have shown that ozonation greatly improves the biological treatment effectiveness allowing the current limits for discharging into the sewer system to be met by using a specific ozone dose of 600 mg O3/Linfluent; an operating cost of about 4 EUR per m3 of leachate was obtained. A strong synergy between ozone and biological degradation was noticed with a O3 consumed/CODremoved ratio of about 0.6.
Ozone-enhanced biological treatment of landfill leachates
Claudio Di Iaconi;Antonio Lopez;
2011
Abstract
Municipal landfill leachates are considered one of the types of wastewater with the greatest environmental impact because of high concentrations of ammonium, salts and organic matter. Usually, recalcitrant pollutants and ammonia removals represent the steps of greatest concern. An innovative process based on ozone enhanced biological degradation, carried out in an aerobic granular biomass system (SBBGR - Sequencing Batch Biofilter Granular Reactor), was tested at lab-scale for treating a typical medium-age landfill leachate. The results have shown that ozonation greatly improves the biological treatment effectiveness allowing the current limits for discharging into the sewer system to be met by using a specific ozone dose of 600 mg O3/Linfluent; an operating cost of about 4 EUR per m3 of leachate was obtained. A strong synergy between ozone and biological degradation was noticed with a O3 consumed/CODremoved ratio of about 0.6.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
