Cattle manure treatment and recovery plant (Navia, Asturias)

Cattle manure poses a problem in northern Spain, where there are a large number of livestock farms. The quantity of this manure, also called slurry, is such that slurry tanks on farms are overflowing and manure is applied without control to fertilise crops.

Apart from the ill effects of this poor waste management for livestock farmers in terms of increased cost and non-compliance with current legislation, uncontrolled use of manure adversely affects a number of sectors:

  • Agriculture: nitrification of soil due to inappropriate composition of manure used as fertiliser.
  • Tourism: negative impact on tourism caused by foul odours.
  • Public health: release of pathogens.

Given this scenario, Biogastur Generación, a company that specialises in renewable energy projects, is undertaking a sustainable project to promote more rational manure management. Biogastur Generación has developed a biogás plant for the purpose of addressing these problems.

To this end, the company has entered into a turnkey contract with Lonjas Tecnología, an engineering company specialising in the design, construction and maintenance of this type of plant. A number of private and public organisations are participating in this pioneering project, in which different technologies are implemented to provide a technically and economically feasible solution to the problem. Lonjas was assisted by the Ahidra- Colsen consortium in the development of the digestion, biogás purification and liquid fraction treatment processes. These companies cooperated in the project through the provision of their patented BIDOX, MBR-NAS and ANPHOS technologies.

The solution presented by Lonjas Tecnología, S.A. proposes centralised manure management through neutralisation by means of anaerobic digestion. The plant consists of three facilities that play a fundamental role in the project. The cattle manure will be sent to a digestion plant, where it will undergo thermophilic anaerobic digestion for a period of 20 days. Other substrates from the area, such as vegetable waste, will be used to complement digestión of the manure in order to optimise the process. This treatment will afford a number of benefits.

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Plant Report published in: #42 FuturENVIRO July/August 2017