Comparison between anaerobic treatability of municipal landfill leachate containing both total and soluble substrate
Subject Areas : environmental management
Keywords: Leachate, anaerobic treatment, batch reactor, bio-gas,
Abstract :
This study investigated the treatability of both Landfill and Compost factory leach ate of Mashhad city using lab-scale completely mixed batch reactor (CMBR). For this reason 4 CMBRs were used in parallel form that reactors 1 and 3 in row were containing leach ate from landfill and compost factory with total Substrate and reactors 2 and 4 in row were containing leach ate from landfill and compost factory with soluble Substrate. The variation of COD, pH and the amount of produced Bio-gas by time were investigated within the temperature of 35°C. As the leachate was young, the initial pH in the all reactors was low (5-5.5). In the reactor which was containing total Substrate didn observed significant variation in pH; but in 2 other reactor the pH over look to near 8.3. Concentration of initial COD in the reactors 1 to 4 in row 7090, 66710, 89501 and 77760 mg/l. As the high concentration of mineral material and to be toxic of them, reduction of COD in the reactors 1 and 3 were slowly and the percent of removal COD in row was 33% and 35%. In addition the value of removal COD in reactors 2 and 4 observed in row 96% and 97%. These results indicated high rate anaerobic processes could be effective in the treatment of young leach ate. The volume of biogas produced in reactors 1 to 4 in row were 25, 86, 21 and 93 L. in addition, the maximum biogas yield in reactors 1 and 3 was negligible and the rectors 2 and 4 in row 0.5 and 0.54 L/g COD removal. Finally a simple module was obtained which forecast the bio-gas production based on kinetic coefficient of batch reactors.