Feedstocks

The feedstocks processed in biogas plants can come from many sources, as almost all organic matters that can be decomposed easily are fit for biogas production. It is important to separate feedstocks according to their place of origin, because only in this way can prevailing regulations be applied accordingly. Managing food processing industry waste in biogas plants is possible, but only by complying with the strict regulations. In case that only plants and manure originating from agriculture are processed, no special hygienic regulations have to be considered.

Feedstocks originating from agriculture: manure, maize and grass for silage, sweet sorghum, Jerusalem artichoke, green vegetal waste, beets, potato, cereals, refuse grain, straw, hay, hemp, Sudanese grass, Chinese reed, cabbage-leaf, etc.
By-products of food industry: sugar beet slices, whey, frying fats, rape-cake, potato peels, potato processing remnants, sunflower-cake, grape pomace, brewer grains, distiller’s wash, canning industry waste, slaughterhouse waste, rumen content, dry bread, glycerin, etc.
Other feedstocks: solid household waste, sewage-sludge, carcase, organic waste from markets, expired food products, restaurant and kitchen waste.

The amount of biogas to be produced from certain feedstocks is determined to a great extent by their protein, fat and carbohydrate content. As a general rule, feedstocks with a high fat content have more pronounced gas producing capacity. In addition, it is also important to know the dry substance content and the organic material content of the substrate. The higher the organic dry substance content of the given matter, the more biogas can be produced from it.

In the course of elaborating and planning biogas plant technology, special attention has to be payed to proper assessment of feedstock combination and quality, as well as the professional prediction of biogas output. The First Hungarian Biogas Ltd. can help its partners greatly in this respect, whereby it ensures economical and effective biogas production.

What do certain abbreviations in German technical literature mean?

FM (Frischmasse):
Real material volume fed into the digester, containing water content. This is the reason why it can also be called fresh mass volume, which is usually indicated in tons.
TM vagy TS (Trockenmasse or Trockensubstrat):
Both expressions refer to dry substance content, which is generally expressed as a percentage, while in the case of gas output, the quantity of biogas or methane formed from 1 kg, or 1 t is indicated in l or m3: Nl/kgTS or m3/tTS
oTM vagy oTS (organische Trockenmasse or organische Trockensubstrat):
The organic material content in dry substances is also expressed as a percentage. This value can be used to determine how much of the total dry substance content can be decomposed by bacteria. Biogas is produced from this amount. Generally, the amount of biogas or methane formed from 1 kg or t is indicated: Nl/kg oTS or Nm3/t oTS. This value can be found in most comparative tables.
Waste materials that can be processed in biogas plants:
Waste materials Biogas output Nm3 / kg oTS*
   
Distillery remnants 0,45 - 0,50
Slaughterhouse waste 0,35 - 0,70
Fish processing waste 0,35 - 0,70
Food industry waste 0,30 - 0,80
Potato waste 0,45 - 0,50
Crop industry waste 0,45 - 0,50
Household biowaste 0,40 - 0,60
Oil/fat filtration remnants 0,70 - 1,30
Used restaurant oils/fats 0,80 - 1,30
Animal manure 0,20 - 0,55
Sewage-sludge 0,20 - 0,55


*oTS - organic dry substance content