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HWAHAK KONGHAK,
Vol.40, No.1, 93-99, 2002
Vol.40, No.1, 93-99, 2002
고정화 질화세균의 암모니아 제거속도식
Removal Kinetics of Low Concentration Ammonia by Immobilized Nitrifier Consortium
본 연구는 polyvinyl alcohol에 고정화한 질화세균군을 이용하는 공기 부상식 생물반응기의 총 암모니아성 질소(total ammonia nitrogen, TAN) 제거속도식을 도출하고자 하였다. 유입 합성폐수 내의 TAN 농도는 5 g/m(3), 온도는 25 ℃를 유지하여 0.05-1.0 hr의 수력학적 체류시간에서 실험하였다. TAN제거속도식은 Monod 식과 잘 일치하였으며 얻어진 최대 TAN제거속도, Rmax와 반포화상수, Ks는 각각 640 g/m(3)ㆍday, 1.667 g/m(3)이었다. 0.6-4.8 g/m(3)의 농도 범위에서는 1/2차 속도식도 TAN제거속도식으로 적합하였다. 본 공정을 정수처리 공정에 적용시킬 경우 6 g/m(3)의 농도를 가지는 원수를 TAN의 음용수 처리기준 이하로 유지하기 위해서 0.9 hr의 수력학적 체류시간이 필요할 것으로 추정되었다. 높은 제거속도를 필요로 하는 공정에 적용시킬 경우 수력학적 체류시간을 감소시킬수록 높은 제거속도를 얻을 수 있는 것으로 나타났다.
The kinetics parameters for total ammonia nitrogen(TAN) removal in a airlift bioreactor using nitrifier consortium entrapped in polyvinyl alcohol(PVA) were evaluated by using a synthetic wastewater at 25 ℃. Influent TAN concentration were 5.0 g/m3 with hydraulic residence time(HRT) ranging from 0.05 to 1.0 hr. TAN removal rate followed Monod kinetics in overall concentration range and maximum TAN removal rate and half saturation constant were 640 g/m(3) · day and 1.667 g/m(3), respectively. For TAN concentration ranging from 0.6 to 4.8 g/m(3), the TAN removal rate can be described by half order kinetics. If this process applied to the water treatment process(influent TAN concentration: 6 g/m(3)), 0.9 hr of HRT was required for drinking water quality of TAN. To get high TAN removal rate, a low HRT was favorable.
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