This plant is designed to convert food discards into fermented fertilizer.                                                                     
1) Background                                                                      
* The outermost layer of earth contains organic materials that plants use to grow.                
Among organic materials, humus, which is resulted from microbial decomposition and synthesis, is critical for plant growth                                                                             
(Optimal humus level in forest region is 3~5%, but the overall Korean soil contains much less humus)                                                                    
* The use of chemical fertilizers (nitrogen, phosphoric acid and potassium) acidify soils  (Korea Fertilizer Association 1997)                                                                             
To make up for the shortage of organic compounds in soil and prevent soil acidification, the supply of organic materials is necessary.                                                                       
2) Factors influencing quality                                                                          
* Temperature : The heat released by the microbial fermentation (55 ~ 60℃) is enough to eliminate pathogens                                                                         
* Oxygen : Aerobic metabolism of microorganisms, temperature control, moisture and gas removal.
* PH : Suitable for microbial growth = PH 5.5 ~ 5.8                                                        
* Moisture : Moisture of  50% - 60% (A key element for decomposition rate, unpleasant odor prevention and efficiency in feed production).                                                                          
* Carbon/nitrogen rate (C/N) : Proper initial carbon/nitrogen rate is  26 - 35% (boost microbial expansion and accelerate the process).