Manufacturing System for High Quality Liquid Fertilizer with High Nitrate Nitrogen No Ammonia Nitrogen and No Suspended Solids

摘要

The present invention relates to a system for producing a high-quality liquid fertilizer that has no malodors due to absence of ammonium nitrogen; is resistant to putrefaction due to absence of suspended solids; and contains a high concentration of nitrate nitrogen beneficial to crops, from effluent (raw water) from an anaerobic digester that contains a high concentration of ammonia and significant amounts of organic matters. The system for producing a high-quality liquid fertilizer comprises: (A) an organic waste decomposition tank which receives, along with the raw water, internal recycled water from the following aerobic tank to dilute ammonium nitrogen and organic matters and to supply oxygen and nitrate nitrogen, causing the vicinity of an inlet to become a microaerophilic region where consumption of oxygen and decomposition of organic matters take place due to aerobic heterotrophic microorganisms, and due to consumption of oxygen, an anaerobic region is formed toward an outlet, such that partial denitrification takes place due to anaerobic heterotrophic denitrifying microorganisms to further eliminate remaining organic matters, heavy foreign materials and surplus sludge are eliminated through sedimentation due to gravity, and treatment water having organic matters removed therefrom and containing ammonium nitrogen and nitrate nitrogen is produced; and (B) an aerobic reactor which receives the treatment water from the organic waste decomposition tank, and in which the treatment water is aerated, ammonium nitrogen is converted into nitrate nitrogen by aerobic nitrifying autotrophic microorganisms, and nitrate nitrogen are accumulated.