مقايسه ميان تصفيه پذيري بي هوازي شيرابه حاصل از محل دفن زباله شهري حاوي سوبستراي كل و محلول

Comparison between anaerobic treatability of municipal landfill leachate containing both total and soluble substrate

This study investigated the treatability of both Landfill and Compost factory leach ate ofMashhad city using lab-scale completely mixed batch reactor (CMBR). For this reason 4 CMBRs were used in parallel form that reactors I 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 of35°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 didnʹt 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 I to 4 in row 7090 , 66710, 89501 and 77760 mg/1. As the high concentration of mineral material and to be toxic of them, reduction of COD in the reactors I 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 I to 4 in row were 25, 86, 21 and 93 L. in addition, the maximum biogas yield in reactors I 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