| Title |
A Study on Kinetic Coefficients of Denitrifying Bacteria or Swine Wastewater Treatment with Various Solid Concentration |
| Authors |
황규대(Gye Dae Whang),황선진(Sun Jin Hwang),장준기(Jun Gi Jang) |
| Abstract |
The objective of this study was to examine the effects of solid concentrations of influent on the removal efficiency of organic matter and nitrate and on the biological kinetic coefficients. Each set of experiments consists of three bench scale anoxic reactors which were operated under different SRT to determine the biological kinetic coefficients and the optimum operating conditions for COD and nitrate removal. In anoxic reactors operated with 18hr of HRT, with the organic loading ranging 2.81∼4.70㎏TCODcr/㎥/day and TSS loading ranging 0.40∼2.49㎏TSS/㎥/day the removal efficiency of TCOD_(cr) and SCOD_(cr) were in the range of about 72∼83% and 62∼85%, respectively. Influent TSS concentration affects the removal efficiency of organic matter and nitrate. With high influent TSS concentration, COD removal efficiency was decreased and nitrate efficiency was increased slightly. To improve the removal efficiency of nitrate. HRT should be increased properly to extend the reaction time of denitrifying microorganism. SRT does not affect the COD removal efficiency and sludge settling characteristic. COD requirement for NO₃^--N removal was ranged from 2.19 to 3.34㎎SCOD_(cr)/㎎NO₃^-N_((Removed)), and was influenced by the influent TSS. Specific denitrification rates were ranged from 0.08 to 0.15㎎N/㎎MLVSS/day. Biological kinetic coefficients Y-t and K-d value of reactor Run-1 which received influent of high TSS concentration were 2.19㎎MLVSS/㎎COD_(cr) and 0.29day^(-1). These coefficients decreased to 0.50㎎MLVSS/㎎COD_(cr) and 0.l0day^(-1) for reactor Run-2 which received influent of low TSS concentration. |