Biological drying tunnel

The solution to the slurry, only with solar radiation It consists in evaporating the clarified fraction from the pig or cattle slurry concentrating to 90 % of the nitrogen in the solid fraction resulting 10 % of the initial volume. Validated system in the BAT. The system can be combined with other treatments to make the distribution of nutrients more efficient (flocculation, NDN sludge…). By concentrating and not destroying the nutrients, it is useful for newly built farms. Nutrients can be used in our land and the same kg of nitrogen can be distributed in less of the 50 % of the travels. By evaporating but keeping the nutrients in the solid fraction, it has a high agronomic value. Odours are avoided during the delivery, since the fraction resulting with more of the 50 % (between 50 and 80) of dry matter no longer smells. The solid is considered a compost, so that it is easy to sell. Emissions of ammonia to the air are reduced more than 90 % by acidification. The output of the air in the tunnel passes through a bio-filter that prevents GHG effect emissions. The treatment cost is very low, since the work is done by the solar radiation. The emissions of nitrogen by infiltration into the soil are the same that a compost. Studies carried out show that practically do not pollute the water table.