Wastewater from the slaughterhouse directly enters this first line, which consists of a water treatment system and a nutrients recovery module. Wastewater gets in a Sequential Batch Reactor (SBR) with a treatment capacity of 50m3 per day, and afterwards goes through a nutrients recovery module, where a filtration process (microfiltration, ultrafiltration and reverse osmosis) takes place. The by-product obtained after this treatment is a concentrate of nutrients, which constitutes the secondary raw material with which the first agronomic product will be formulated and manufactured: an organic fertiliser.
In addition to the nutrients concentrate, a second by-product is obtained in the water line: the sludge resulting from wastewater treatment. This sludge goes through a first pre-treatment process where pathogenic microorganisms are eliminated and its sanitisation is achieved. Subsequently, it enters the fermentation unit composed of a bioreactor, where the sludge is fermented with Bacillus sp. As a result, a hydrolysed sludge with high availability of organic matter is obtained, which can be used in other biological processes such as anaerobic digestion. Hydrolysed sludge constitutes the secondary raw material with which the second agronomic product will subsequently be formulated and manufactured: a biostimulant.
Again, there is a second by-product generated by the sludge line in addition to the hydrolysed sludge, a liquid fraction that is upgraded in this energy recovery module through an anaerobic digestion process. In this process, organic matter is transformed into biogas, which is composed mainly of CH4 and CO2, in addition to traces of other gases. CH4 (methane) later will react with oxygen at high temperatures to produce hydrogen, which will pass through a fuel cell to generate electrical energy. The by-product obtained after this treatment is methane with which energy will be generated, which can supply either the slaughterhouse or the system itself.
In addition to methane, the energy recovery module produces a second by-product, CO2, which, in turn, is captured in the algae line and contributes to algal biomass growth. The AlgaBioGas (AGB) technology is used in this algae treatment process, which is based on an algae ponds system that allows the control and measurement of the water input and output parameters. The by-product obtained after this treatment is an algal biomass that constitutes the secondary raw material with which the third agronomic product will be formulated and manufactured: a second biostimulant. In addition, the reclaimed water resulting from the treatment applied in the water line can also be used in this algae line, filling the ponds where the algae grow and closing the loop completely this way.