The described full scale wastewater treatment plant of the potato chips factory is working with a two-stage anaerobic pretreatment followed by an aerobic purification with nitrogen and phosphorus removal. Extraordinary elements of the plant are the fixed-film methane reactor and the trickling filter used as a cooling element between the anaerobic stage and the activated sludge system. A sludge blanket was built up underneath the swimming support media of the fixed-film methane reactor. During the first year of operation the energy profit by methane production was 1 056 000 kWh, which is 50 % of the whole energy consumption of the wastewater treatment plant.

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