Marc is also energy. Renewable, organic, safe.
It is heat that warms us, light that illuminates us, electricity that helps us.
A treasure for the whole community.
(bio)gas all the way
The Di Lorenzo distillery also produces renewable energy.
It does so by recovering and converting all the biogas released naturally from the treatment plants into electricity, and has done so for more than forty years.
The process takes place in three “digesters” with a total volume of 17,200 cubic metres. Here the wine vinasse, the liquid discarded during the processing stage, is processed through what is indeed called anaerobic digestion.
Anaerobic digestion is a complex biological process in which, in the absence of oxygen, the organic substance is transformed into gas.
The plant operates under mesophile conditions. This implies a need for the action of two types of specialised micro-organisms to pass from a solid state to a gaseous state.
A first group of bacteria degrades and transforms the organic substance into intermediate compounds, such as hydrogen, acetic acid and carbon dioxide.
A second group of bacteria, formed by methanogenic micro-organisms, completes the process and produces biogas.
Part of it is used as fuel for the company, while the rest is converted into renewable electrical energy by a thermal power plant, where the heat is recovered to produce new steam and hot water intended once again for the production cycle.
The renewable electricity produced is fed into the national grid. Available to all.
This is the final gift from the marcs after they have been processed.
It allows us at the Di Lorenzo to have a continuous and essential supply of energy and the community to have an effective control over greenhouse gas emissions with an environmental impact immeasurably less than that resulting from the use of fossil fuels.
Marcs are what remain from pressing fresh or trodden grapes.
They consist of the skin, grape-stalks and grape-seeds. They are at the basis of a distillery’s production and for us they are also a source of energy.
After capturing their core (marcs have fermentable sugar that is turned into alcohol), extracting the calcium tartrate, removing and processing the seeds, we dehydrate them and let them dry.
Once this procedure has been completed, it can either be used a great supplement for animal feed or a natural fuel.
It is essential to have a constant supply of energy for the distillation process. The steam needed to carry out the processing stages is generated by two boilers: Pelucchi and Luciani.
The fuel used to operate them consists of largely dried marcs, regarded as a clean form of energy in every respect. With a dual value: it is a way of valuing food waste and ensures a virtuous form of disposal for wine producers.
However, we also employ biogas generated by the digestion phase, while a small contribution is provided by the methane network (occasionally used as an integration for other fuels or during the start-up phase).