Process and plant for purification of waste from zootechnical sources

A process for the purification of waste from zootechnical sources, organic fraction of municipal solid waste (OFMSW) treatment plants, food companies, or landfill leachate, comprising the steps of:

• a) performing digestion on the waste, thereby producing a biogas and a digestate,
• b) treating the digestate of step a) to separate a solids part from a liquid part,
• c) stripping the liquid part obtained from step b) to remove ammonia, and
• d) treating an aeriform product of step c) to absorb ammonia,
• wherein sodium hydrate or calcium hydrate is not used in step c);
• wherein step c) is carried out in a single batch tank having a compressor with an insufflation system connected to the bottom of the tank;
• and
• wherein step c) is carried out:
• at a temperature of about 55 to about 65° C.,
• for about 6 to about 9 hours,
• with an insufflation of air at a flow rate of about 800 to about 900 m3/h.