Biogas a multidimensional source for renewable energy
The interest towards biogas is constantly growing, and its production within the EU is also increasing. The benefits of biogas are conclusive: it is a renewable energy source, it merges with waste management and creates employment through the establishing of new biogas plants. More and more new kinds of organic waste, such as slaughterhouse waste, manure, and compostable household waste, can also nowadays be used in biogas production.
Kemira has been cooperating with various universities and research partners both locally and overseas, creating a vast amount of knowledge on how to improve the biogas process. The objectives for Kemira’s biogas program are to increase the production of renewable energy and to decrease the environmental side-effects of the process.
Intensifying production sustainably
Kemira BDP (Biogas Digestion Product) answers the needs for enhancing the production of biogas. By improving the efficiency of the microbes, the substrate load can be increased. This results in more – and cleaner – biogas being produced.
In addition to renewable gas, the biogas process also produces a nutrient rich sludge called digestate. Having made a public commitment to the Baltic Sea Action Group, Kemira is committed to returning nutrients in wastewater sludge to the natural cycle, as well as to introducing solutions for safe recycling of nutrients into crop farming without causing eutrophication.
Solutions for digestate dewatering and reject water treatment
Digestate treatment is part of the a biogas process that can cause headache in municipal water treatment plants. As the digestate contains nutrients useful for plants as well as other organic matter, it can be used as valuable biofertilizer. The solid-liquid separation, which is one of Kemira’s key competencies, enables nutrient recovery and recycling into the biofertilizer.
The reject water, which is a by-product of the process, is usually of poor quality, increasing the nutrient and organic matter loads at the municipal wastewater treatment plants. Kemira has developed different kinds of techniques to decrease the amount of suspended solids in the reject water, thus enabling sewerage of the water without causing nutrient releases into the waterways.