Biological treatment of landifill leachate by activated sludge in SBR reactors
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In the study, the efficiency of landfill leachates treatment by activated sludge in anaerobic-aerobic conditions in sequencing batch reactors (SBR) was examined. The experiments were carried out in four series characterised by different hydraulic retention time in reactors (t = 12, 6, 3 and 2 days), which was obtained by increasing the volumetric change rate in a treatment cycle from 8.3 to 50%. The highest efficiency (82.9%) of organic substances removal, expressed as COD, was noted for the retention time t = 12 days, and the lowest (70.6%) for t = 2 days. The activated sludge yield coefficient was Y = 0.56 g/g COD, and the decay coefficient kd = 0.013/ d. In series 1-3 complete nitrification was observed. Concentration of ammonia nitrogen did not exceed 1 mg NNH4/ dm^3. The efficiency of total nitrogen removal in the following series varied from 83.5 to 74.7%. Nitrates concentration in the leachate increased from 4.1 to 18.7 mg NNO3 / dm^3. In series 4 ammonia nitrogen concentration in the end of the cycle was 46.4 mg NNH4/ dm^3 and the concentration of nitrates 1.4 mg NNO3 / dm^3. The efficiency of total nitrogen removal equalled 54.3%.
Publication order reference
E.Klimiuk, Katedra Chemii i Technologii Wody i Siekow, Akademia Rolniczo-Techniczna, 10-957 Olsztyn-Kortowo, Poland