Energia | Planta de biogás

Imprimir

Energía verde: planta de biogás

Esta página aún no está disponible en español, pero pronto será traducida. Aquí la versión en inglés:

Principle

Trevi builds together with BiogasTec facilities for anaerobic digestion, also called biogas plants. A biogas plant is a plant which - as the name implies - produces biogas. This gas is a renewable energy source on the basis of organic material. This organic material concerns manure, waste, or energy crops.

Biogas is certainly not new. Spontaneous fermentation of organic material with formation of gas is a natural process. The gas that gets created has been used since ancient times. A biogas plant ensures that the biogas is optimally formed in controlled conditions.

The process is done in the absence of air (anaerobic =) and consists of four consecutive microbiological processes: hydrolysis, acidogenese (fermentation), acetogenesis and methanogenesis. The complex organic mass (= biomass) is converted finally through these various stages into biogas. Biogas is a mixture of predominantly methane and carbon dioxide. This is shown below.

Scheme

The basic principle is always the same: an optimal mix of input streams being brought together in a large stirred tank, the fermenter, which is maintained at temperature. The fermentation process allows for formation of biogas and digestate. The digestate is a fertilizer which may or may not be further processed before being used in agriculture. The biogas itself is used as fuel for the production of green electricity and heat. The digestate can be further treated with proven manure treatment technology (nitrification / denitrification, evaporation).

An example of an agricultural digester (Agrikracht, site Rumbeke). Figures solely indicative

Applications

Primarily organic biological waste gets used as source and where appropriate supplemented with manure and / or energy crops. Biogas can also be extracted from wastewater or from historical landfills.

Biogas is currently mostly ultimately used as fuel for a gas engine cogeneration (CHP). Associated generator allows for the generation of renewable green electricity that is put on the net.

Further processing of the biogas is also possible up to a quality comparable to that of natural gas. In that case it is called biomethane which can be injected into the natural gas grid or used as transport fuel (bio-CNG) after it was pressurized.

Example of realisation

Together with BiogasTec five installations have so far been built:

  • Agrikracht – Rumbeke: 35.000 ton, 835 kWe
  • G.S.L. – Halle: 35.000 ton, 1131 kWe
  • Agrikracht – Moorslede, 48.000 ton, 1486 kWe
  • Digrom Energy – Ardooie, 89.000 ton, 2 x 1486 kWe
  • Leiestroom – Menen, 95.000 ton, 3 x 1486 kWe

Approach Trevi

Every biogas project is unique. With this as starting point we set out to find the optimal conceptualisation and dimensioning of the project. Given the source materials (manure, corn, waste) and the output (fertilisers, electricity, heat) we search for synergies to accomplish the most cost effective solution for each project. The entire project development is followed up by sister company BiogasTec. More information can be found on the website www.biogastec.com. The electricity produced is sold by sister company Trevion.