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Treatment of landfill leachate in intermittently aerated hybrid or conventional SBRs operating at different temperatures

Research on the treatment of leachate from municipal landfill was carried out in three sequential batch reactors (SBRs) and their hybrid variants (HSBR) equipped with biomass carriers made of PU foam cuboids. The reactors were operated at 20°C, 30°C, and 40°C. The operational cycle lasted 24 h, while hydraulic retention time was set at 48 h. In the reactors alternatingly aerobic (DO < 1 mg/L) and anaerobic conditions were maintained. Raw leachate was characterized by COD concentration of 3,278, 672 mg/L of total nitrogen, including 630 mg/L of TAN. Neither nitrate nor nitrite nitrogen was found in the leachate drained from the landfill. The nitrogen loading rate was relatively low in all reactors and amounted to 0.315 kg/m3 d. The highest removal efficiency of both organics and nitrogen compounds was achieved in HSBR operating at 40°C, and was 78% and 80.8%, respectively. Quantitative analyses of the most common bacteria phyla in the landfill leachate treatment systems were determined after the stabilisation of the outflows by qPCR, and shown a significant decrease of 16S rRNA copies with an increase of temperature.