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    Effect of COD/SO42- ratio on anaerobic treatment of landfill leachate during the start-up period
    (TAYLOR & FRANCIS LTD, 2012) Yilmaz, Tuba; Erdirencelebi, Dilek; Berktay, Ali
    This study investigates the performance of an anaerobic baffled reactor (ABR) during the start-up period of raw young landfill leachate treatment at two chemical oxygen demand (COD) to SO42- ratios of 20 and 4. The reactor was operated at ambient temperature and low organic loading rates (0.52, 0.76 and 1.05 kgCOD/m(3) per day). During the study, sulfate-reducing bacteria (SRB) activity increased at the lower ratio of COD/SO42- producing higher levels of sulfide and alkalinity. The dissolved sulfide concentration reached an inhibitory level above 250 mg/L, which caused a sharp reduction in the total COD removal efficiency from 77-80% to 32%. Total volatile fatty acid (TVFA) production proceeded at a constant level despite increased organic loading. As the effluent total and organic COD concentrations increased, the inhibitory effect of the inborn sulfide was correlated to the limitation experienced in the hydrolysis/acidogenesis stages, and thus VFA production and organic matter removal.
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    TREATMENT OF YOUNG LANDFILL LEACHATE BY FENTON PROCESS
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Aygun, Ahmet; Yilmaz, Tuba; Berktay, Ali; Nas, Bilgehan
    In this Study leachate from solid waste landfill in Konya Municipal area was used. Landfill occupies 24 ha area with ail average height of 8 m in the total area of 350 ha at the present time. The amount of solid waste generated is about 800-850 tons/day in summer and 950-1,000 tons/day in winter months yielding the average leachate flow rates of about 100 m(3)/day. The main characteristics of the leachate are chemical oxygen demand in the range of 7,500-55,000 mg/L, biological oxygen demand after 5 days of 4,000-36,500 mg/L. It is observed that presenting a relatively high value of COD and BOD5 and the rate of COD/BOD5 values indicate that the leachate call be defined as young. The aim Of this Study is to investigate the leachate treatability by using fenton process. There are a number of studies on treatment of old leachate with fenton but ill this study Young landfill leachate was used and removal efficiencies of color and organic matter as COD were investigated. For this purpose Suitable conditions were accepted as optimum pH = 4.0, optimum Fe+2 = 3000 mg/L and optimum H2O2 = 10 000 mg/L.