Pig manure biogas plants. Biogas plants for animal farms are the simplest ones and most widespread in the world. Microorganisms participating in fermentation process get into the manure from animal bowels, so there is no need for their injection. Also hydrolysis bioreactors are not required. Equipment sets are of modular type so if livestock is planned to be increased biogas plant power extension is easy to be performed. By using biogas plant the volumes of lagoons can be reduced twice. Organic matter in manure has colloid bounds that hinder water evaporation from substrate. Biogas plant reduces organic matter content and digested biomass is separated that makes easy water evaporation. Very often farms have own fields for agricultural and feeding crops. Biogas plants make considerable cost savings for mineral fertilizer and plant-protecting agents purchase. Below you can find main advantages of bio-fertilizer produced by biogas plant if to be compared with raw manure and chemical fertilizer: Maximum ammonia preservation and accumulation. Within continuous process of manure storage (composting) 50% of ammonia is lost. Thanks to anaerobic digestion in biogas plant total ammonia N completely preserved in bio-fertilizer, besides dissolved ammonia NH4-N content increased by 10-15%. Absence of weed seeds. 1 ton of fresh cattle manure contains up to 10 thousand weed seeds that are capable for germination even after they passed through animal’s stomach. After biogas plant weed seeds lost 99% of their germinating ability. Absence of pathogenic microflora. Animal manure can contain human and animal health hazard diseases: salmonellosis, ascariasis, intestinal diseases. Due to special treatment in biogas plant bio-fertilizer is almost free of pathogenic microflora. Presence of active microflora. High level of organic matter humification serves as a powerful impact for soil microorganisms activation. Ammonia fixing and other microbiological processes are also considerably intensified. No need for preliminary storage. Thanks to its form bio-fertilizer can be effectively applied without any preliminary storage and has affective result after injection into the soil. Soil Nutrients wash-out resistance. During the season about 80% of chemical fertilizer is washed-out from the soils, hence the need of its annual application in big quantities. In the same time only 15% of bio-fertilizer is washed-out, that is why even in small quantities they will work 3-5 years longer then chemical fertilizer does.