As a microbial growth and limitation point of view, F/M ratio and C/N ratio are one of
the most important parameters for process optimization in biological wastewater treatment process.
Municipal sewage in Korea is characterized by extremely low content of carbon source and relatively
higher portion of N source. Accordingly, it is necessary to dose external carbon source in order to
obtain higher degree of carbon source within the process. Filtered-wastewater from thermal hydrolysis
process(THP) will lead to maximize F/M ratio and to exchange microbial kinetic within the process.
In this study, the effects of filtered-wastewater from THP as an alternative plan for increasing carbon
source on the cell disintegration and COD solubility of waste activated sludge were conducted under
well defined experimental conditions. During 5 hours, the values of specific nitrification rate(SNR) and
specific de-nitrification rate(SDNR) were 0.24∼0.51mg/g/hr and 0.08∼0.25mg/g/hr, respectively.
Specific phosphate release rate(SPRR) and Specific phosphate uptake rate(SPUR) values were 0.29∼
2.47mg/g/hr and 0.22∼2.93mg/g/hr, respectively. The value of Specific substrate uptake rate(SSUR)
for filtered-wastewater from THP is approximately 2.8 times higher than the value of SSUR for
reference sample.