Best practice case study for a biomethane production facility, site of site Zalavíz Waterworks Company
The biogas / biomethane plant is located at a waste water treatment plant trating waste water from Zalaegerszeg, a large conurbation in the South West of Hungary. The treatment plant occupies an area of approximately 1 hectare and does not operate a clarification plant but uses a 3 stage Phoredox (A2/O) activated sludge treatment process. This is similar to a conventional activated sludge system with an anaerobic zone ahead of the aerobic basin but also includes an additional anoxic zone following the anaerobic zone. The anaerobic digesters were installed in order to treat surplus activated sludge and were commissioned in December 2009.