| Title |
A Study on Kinetics Coefficients in Activated Sludge Process for Swine Wastewater Treatment |
| Authors |
황규대(Gye Dae Whang), 김민호(Min Ho Kim), 조철휘(Chul Hwi Cho) |
| Abstract |
The objective of this study was to examine the effect of solids concentration of influent and biological nitrification on the removal efficiency of organic matter and biological kinetic coefficients. Three sets of reactors were operated to investigate the effects of influent TSS concentration and nitrification on the COD removal efficiency and excess sludge production. Each set of reactor consists of three bench scale activated sludge reactors were operated under different SRT to determine the biological kinetic coefficients and the optimum operating conditions for COD removal and nitrification. In activated sludge reactors operated with 1.5day of HRT, with the organic loading ranging 0.80∼1.75㎏TCODc_r/㎥·day and TSS loading ranging 306∼1889㎎/ℓ, the removal efficiencies of TCODc_r and SCODc_r were about 71∼90% and 61∼78%, respectively. Influent TSS concentration affect the removal efficiency of organic matter and biological kinetic coefficients. However, SRT does not affect the COD removal efficiency and sludge settling characteristic. In operated with the loading rate of 0.51㎏NH₄^+·N/㎥·day, nitrification efficiency was over 91%. The optimum operating conditions for COD removal and nitrification was l0days of SRT. Yt and Kd Values of reactor set #1 which received influent of low TSS concentration and operated without nitrification were 0.2776㎎MLVSS/㎎SCODc_r and 0.036day^(-1), respectively. These coefficient increased to 1.9693㎎MLVSS/㎎ SCODc_r, and 0.187day^(-1) for activated sludge reactor set #2 received influent of high TSS concentration and operated without nitrification. Nitrified activated sludge reactor set #3 received influent of high TSS concentration produced Yt of 2.1769㎎MLVSS/㎎SCODc_r and Kd of 0.204day^(-1). |