Eszterházy Károly College Faculty of Natural Sciences
For the sake of the promotion of the exploitation of renewal primary commodities (NawaRos) as energy carriers in 2004, in the area of Gartow an opportunity for an establishment of a central biogas plant was examined within the framework of the LEADER + programme. The very first movement of these outcomes was a putting into operation of a commodity producer biogas plant. This equipment with its 750 KW performance is operated by 9 farmers who have invested 1,7 million euro to their new source of income and with electric current they supply 1000 household at the present day. All primary commodities derive from farmers of the neighbouring region.
The farmers of Gartow have set themselves an even bigger goal: they wanted to provide the heating requisite of the swimming-pool, the elderly home located in the castle, and the school of Gartow with the heat that derives from the biogas plant. In the course of the biogas transformation to electric current, only from the 40 % of the invested raw material became electric power, but the further heat share of 45 percentages that up to now was not utilized, in other words, the waste heat will be exploited. This heat has just already utilized partly up to now, which of course was altered in the meantime for the sake of increasing effectiveness
For the sake of the promotion of the construction contracts and for technical plans a project that is called Agenda 21 was bring to life, which were financially aided with communal money throughout the Lower-Saxon Ministry of Environment. An opportunity was given for the further use of further 1,2 million euro source of support, for building out a 3,3 kilometres long underground tube. This trivial problem has already arisen at the very beginnings considering the supply of the consumers, in other words, heat is only evolved in the plant, if the motor produces current and enough biogas is at our disposal. It has become quickly clear that a second boiler should also be connected to the system, which- of course-would have significantly risen investment costs, in addition contributing producers would have wanted to utilize evolving heat, but without the additional capacities which are necessary to this. The whole community of Gartow has suddenly fallen into a difficult situation.
An old-fashioned wood-chips furnace has been operating for the heating of the schools of Gartow since 1998. Inasmuch as heat derives from biogas is not enough without this appliance they have decided to feed the -heat that is derived from the boiler – into the network, so heat which comes from the wood chips also utilized in the previously mentioned swimming-pool. This idea has been realized throughout a bypass- machine. This way the wood-chips boiler is able to provide the heat supply of the elderly house, too, as well as, since January, 2007 the guests of the bath of Wendeland have been bathing in the water which is warmed up by the bioenergy of the region - in the summer with the heat of the renewal raw materials, while in the winter with the warm of the wood-chips of the surrounding greenwood. The other heat consumers are also satisfied, since the bio-origin heat of the Gartow GmbH & CO. not only protects the environment, but also the purse.
Heat supply with the former heating oil or rather with petroleum have resulted in an annual 697,34 tons of carbon- monoxide emission. Merely the current production from biomass currently saves 3600 tons of carbon-monoxide annually, and the carbon-dioxide-free heat supply which derive from biogas exchanges the whole of the up to now emission carbon –dioxide amount, furthermore the money that earlier was spent on heating oil or gas so went out of the region, now remains in the local economy circulation.