Research on leachate recirculation from different types of landfills

The landfill reinjection of concentrated leachate: Findings from a monitoring study at an Italian site

“…higher BOD 5 , COD, BOD 5 and Ammonia levels) than conventional landfills during the first 2-3 years of recirculation [14]; it also shortens the time required for the stabilization of waste [15,16].…”

Impacts of aeration and active sludge addition on leachate recirculation bioreactor

“…Thus, the landfill gas (LFG) generation rates are enhanced while the environmental impacts are reduced by containing the leachate and controlling the LFG emissions. Recent study has shown that leachate recirculating could reduce the organic concentration considerably, with a maximum reduction rate of COD over 95%; and, using a semi-aerobic process [34]. The volume of leachate is reduced by maximizing evaporative losses during recirculation which can reduce leachate treatment capital and operation cost, and thus the overall contaminating life span of the landfill is reduced [9,26].…”

Determinants of Optimal Aerobic Bioreactor Landfilling for the Treatment of the Organic Fraction of Municipal Waste

“…Aerobic degradation has positive impacts on leachate quality in terms of the levels of Biochemical Oxygen Demand (BOD 5 ), Chemical Oxygen Demand (COD), and Volatile Organic Compounds (VOCs) as well as the concentrations of metals and the decreased ecotoxicity, mutagenicity, genotoxicity, and estrogenicity (Giannis et al, 2008;Erses et al, 2008;Sinan Bilgili et al, 2007;Wang et al, 2006;Ishikagi, et al, 2003). An aerobic bioreactor results in a significant decrease in BOD and COD levels within a relatively short period as compared to anaerobically operated landfills.…”