Studies on the Biological Treatment of Waste Water from Acetaldehyde Plant

아세트 알데히드(특수산업) 폐수의 생물학적 처리

In order to establish the biological treatment system which can be used for treatment of waste aster from acetaldehyde plant, it was investigated optimum nutrient requirements and growth conditions by mixed culture of Micrococcus roseus AW-6, Micrococcus luteus AW-22, Microbacterium lacticum AW-38 and Microbacterium laevaniformans AW-41 as well as the effect of coagulants and neutralization reagents. Also, it was carried out the continuous culture as well as batch culture to treat the waste water by mixed culture of these strains. The COD removal rate was reached to maximum state for 96hrs culture at pH7.0 and $30^{\circ}C$ NaOH as the neutralization reagents was the most effective, but the coagulants had no effect on the COD remonal rate and the optimum dilution times for treatment were 10 fold. The COD removal rate was also increased by supplimenting 200 ppm $NH_{2}NO_{3}$, 50 ppm $KH_{2}PO_{4}$, 15 ppm $CaCl_{2}$ and 1 ppm $MgSO_{4} \cdot 7H_{2}O $ as additional nutrients. The removal rate coefficient $K_{1}$ on the batch culture was $4.5\times 10^{-6}$, and the detention time for BOD removal rate of 85% was approximately 45hrs. The COD of waste water was reduced to 15% of its initial value by the continuous culture. The COD and BOD of the effluents were to be about 60 ppm and 40 ppm, respectively, and final pH was 7.0.

아세트알데히드 공장폐수의 생물학적 처리를 위하여 중화제 및 응집제의 효과를 검토하고, 4개 균주 Micrococcus roseus AW-6. Micrococcus luteus, AW -22. Microbacterium lacticum AW-38. Microbacterium laevaniformans AW-41을 혼합 배양하여 미생물의 영양요구량 및 성장에 미치는 환경인자 둥을 조사한 결과는 다음과 같다. 아세트알데히드 폐수를 잘 자화시키는데 필요한 온도는 $30^{\circ}C$였고 pH는 7.0이였으며 96시간째에 COD 제거율이 최대에 달하였다. 폐수처리를 위한 중화제로서는 NaOH가 가장 좋았고 응집제의 처리 효과는 인정되지 않았으며 폐수처리를 위한 최적 희석배수는 10배 정도로 나타났다. 균 생육을 위한 영양원으로서는 $NH_{2}NO_{3}$ 200ppm, $KH_{2}PO_{4}$, 50ppm, $CaCl_{2}$ 15ppm. $MgSO_{4} \cdot 7H_{2}O $ ppm을 보충하였을 때 COD 제거율이 향상되었다. 회분배양 실험결과 속도계수 Kl은 4. 5X 10-6이었으며, BOD 제거융을 85%로 하기 위한 체류시간은 45시간 이었다. 연속배양 결과 COD 제거율은 85%로 나타났으며 처리수의 수질은 COD 60ppm. BOD 40ppm, pH7.0 정도로서 환경기준치 이하였다.