논문 상세보기
pp.760-768
The proper disposal of digestate from biogas plants has been focused while the use of biogas plants to treat organic waste has been considered as a way of green energy production. This study analyzed chemical and biological characteristics of two types of digestates from 6 domestic biogas plants for low cost and environmental recycling. The results showed that separated solids met current standard for compost within organic content, ratio of organic matter and NaCl concentration, although water content and maturity of separated solids did not meet the standard. Total content of N, P2O5 and K2O in separated liquids met current standard for liquefied fertilizer except that in separated liquids from sewage sludge, although NaCl content of separated liquids from food waste exceed the standard. Heavy metal content, coliform count and 2 kinds of harmful microorganisms were also detected below domestic standard for compost and liquefied fertilizer. These results suggested that digestates from biogas plants could be recycled to be fertilizer with additional treatment such as post-composting or salinity removal process.
