The name WELTEC BLUE WATER thus reflects the growing global demand on the one hand and refers to the largest output of water on the other. Plants are currently under construction and at an advanced stage of project development in Europe, Asia and the USA. The first references in Japan and Spain for the easily scalable systems are nearing completion. The technology is proving to be interesting for farms in processing regions where there is a high supply of liquid manure or water shortages – such as in Denmark and Spain. In Europe, investments are supported by the European Agricultural Fund for Rural Development (FEADER).
The WELTEC BLUE WATER technology is also suitable for separating nitrogen and returning the water to the biogas process to dilute the source materials. A high proportion of nitrogen-rich input materials such as poultry manure for the production of biogas is possible with the system. Compared to other systems, WELTEC BLUE WATER requires no thermal energy and converts the excreted solids into high-quality fertilizer.
For use from 50,000 tons per year
WELTEC BLUE WATER separates the solids from the water in a multi-stage process. The distribution of the separated materials can vary depending on the dry matter content of the input material. An independent investigation of the treatment plant in Deurne in the Netherlands by the Lower Saxony Chamber of Agriculture in 2015, for example, revealed the following segmentation: 55 percent dischargeable water, 25 percent solids and 20 percent liquid nutrient concentrate. At the beginning of the process, additives are mixed into the source materials to increase efficiency.
This flocculates the finest components and makes them easier to separate. At the same time, certain substances are better separated from each other and odour emissions are minimized. The fermentation residue is then dewatered in a belt press. The solid material with a dry matter content of around 30 percent is used or sold by users as fertilizer, compost, animal bedding or as a biogas substrate. The system is modularly scalable and can be used from 50,000 tons per year.
