On 9th October 2018, Hitachi Zosen Inova (HZI) reported that Entsorgungswirtschaft Soest awarded a tender on 25th September to construct a plug-flow anaerobic digester with gas conditioning at its composting plant in Anröchte, in the district of Soest, North Rhine-Westphalia. HZI won the tender and will construct the entire digestion section over the next 15 months.
HZI is supplying a Kompogas plug-flow digester with integrated feeder that has a capacity of 1,500 cubic metres, for the anaerobic digestion of 15,000 tonnes per annum of separately collected organic waste. This will produce around 1.5 million Nm3/annum of biogas from fermented biomass. The gas will be fed to two downstream cogeneration plants with a total installed capacity of 1 MWe, while the heat produced will be used by the adjacent composting unit.
Approximately 3.5 GWh of electricity will be generated from the processed organic waste. This covers the energy consumption of 1,100 German households.
Construction of the plant is planned to begin in May 2019, with operation due to start in early 2020.
The construction of the Kompogas plant addresses the need to ensure a stable supply of electricity during peak loads on the grid. The two cogeneration units differ in size. The first, smaller unit covers the constant heating and power needs of the entire plant, including the composter. The second, more powerful unit, only goes online to feed electricity into the public grid during day-to-day peak loads. The plant thus supports needs-based power generation.