RECIRCULATION COMPOST IN COMPOSTING PROCESS AND NUTRIENTS ACCUMULATIONSuwimon Buaprom, Noppawan Semvimol, Onanong Phewnil, Thanit Pattamapitoon and Kasem ChunkaoAbstract The soil was the primary material for the food waste composting process, and the problem of compost product qualities, especially nutrients, was lower than standard. This study investigated the role of compost utilization as a cover material by using compost as a soil substitute for scarce land areas and study nutrient accumulation when recirculation compost products. The research aimed to study phenomena of SO4 2- and nutrients accumulation and also study supporting factors. The experiment was three varied treatments with cover materials: T1 was only soil covered, T2 was using the compost product from T1 mixed with soil in ratio 1:1, and T3 was using the compost product from T2 mixed with soil in ratio 1:1. The research was stimulating from the concrete box composting under the nature-by-nature concept. The results found that compost product recirculation over one time in the composting process promotes sulfate reduction, affecting negative Eh value. The change in physical and chemical properties found that alkalinity pH helped to inhibit the substrate precipitation in entirely anaerobic conditions. The compost qualities indicated that TN and TP from T3 treatment were higher than others, but TK and sulfate were decreased by nutrient leaching on unsuitable conditions. In the second crop, the use of compost products as cover materials was associated with a fivefold increase in sulfate accumulation in the compost, but this relationship was changed in the third crop. Alkalinity and pH, both of which can enhance reduction conditions, were influencing factors. Sulfate-rich accumulations and nutrient productivity, on the other hand, demonstrate a non-relative relationship. |