| Title |
Coaculation of the Organic Substances on the Activated Sludge Flocs |
| Authors |
전항배(Hang Bae Jun), 이정훈(Jeong Hun Lee), 이종대(Jong Dae Lee) |
| Abstract |
A post-denitrification process which uses the coagulated influent organic matters on the returned activated sludge is proposed to overcome organic deficiency for denitrification. To enhance the coagulation efficiency of influent COD, various experiments were performed for the optimum coagulation conditions with several organic matters and F/M ratios and at the different cultural environments. The activated sludge from a biological nutrient removal (BNR) process operated with sewage was able to remove glucose and soluble COD(SCOD) in the raw sewage by 90%, 63% as SCOD, respectively. SCOD was separated by 1st-order relations in 10minutes, and their reaction constant, k was 0.626 of glucose, 0.285 of sewage, and 0.147 of diluted animal waste. Separation of DOC with molecular weight(MW) distribution by activated sludge was 25% of MW below 1,000, 20% of MW above 10,000. MW between 1,000 to 10,000 did not removed at all. The effects of F/M ratios on SCOD separation rate was not so apparent, but the optimum F/M ratio was 0.2 in this test. Conventional activated sludge operated aerobically removed SCOD and TCOD(Tolal COD) by 40㎎/L and 62㎎/L, respectively. In this case, the overall TCOD removal efficiency was as low as 28%. Activated sludge from DEPHANOX process could remove SCOD and TCOD 42㎎/L and 135㎎/L, respectively, which resulted TCOD removal efficiency up to 68%. The overall TCOD removal efficiency with SBR sludge adapted with sewage was also as high as 68%. |