Biomethane and Biogas production

Biogas is generated through fermentation in the absence of oxygen (anaerobic digestion) of substances of animal and/or plant origin. In biodigesters, the organic fraction present in biomass is transformed into biogas through the action of microorganisms. Subsequently, the biogas can be turned into biomethane, or it can go to a cogenerator for electricity and heat production.

Problem:

The process generates an effluent, digestate, a rather dense and concentrated aqueous solution that contains mainly ammonia nitrogen, COD/BOD, phosphorus, and heavy metals.

A fairly common practice is the field spreading of digestate; however, regulations do not always permit its spreading on farmland. If not properly distributed, digestate can become harmful because it can generate nitrate losses to water (if it is applied at inappropriate times and doses are exceeded), or it can generate ammonia emissions to the atmosphere.

It is also an expensive activity because it requires large available area and is, in the long term, highly polluting to the aquifer.

Solution:

Vacuum evaporation is among the most effective emerging technologies for the treatment of agricultural digestate or Forsu, because it yields a concentrated fraction that can be enhanced as a fertilizer.

Advantages:

→ The production of a concentrated fraction that can be enhanced as a fertilizer
→ In combination with reverse osmosis, water suitable for irrigation is obtained
→ Drastic reduction in disposal costs
→ Good recovery of water volumes

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