Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Bio-kinetic and Design Analysis for Box-mill Wastewater Treatment Using Anoxic Activated Sludge Process

무산소 활성오니공정을 이용한 판지공장 폐수처리의 동력학적 해석 및 설계분석

  • Published : 2006.10.31
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Abstract

The anoxic activated sludge process was applied to the treatment of industrial box-mill wastewater, which exhibited the high removal efficiencies of $90{\sim}94%$$ TCOD_{Mn}$ and $58{\sim}81%$ Color. For the design of industrial anoxic activated sludge process, Monod bio-kinetic coefficients of box-mill wastewater were estimated as follows: $K_{max}$(maximum specific substrate removal rate)=0.52 $day^{-1}$, $K_s$(half saturation constant)=314 mg/L, $K_d$(decay coefficient)=0.274 $day^{-1}$, y(microbial yield coefficient)=0.908 mg/mg, and ${\mu}_{max}$(maximum specific growth rate)=0.472 $day^{-1}$. Space loading factors for the design analysis were practically determined as the values of F/M ratio=$0.043{\sim}0.07$ kg-$TCOD_{Mn}$/kg-SS-day, BOD space loading=$0.18{\sim}0.3$ kg-$TCOD_{Mn}/m^3-day$, and ${\theta}_x=6.8{\sim}26.4$ day when considering the relationship of these loading factors with growth dynamics of microorganisms, the F/M ratio that is inversely proportional to ${\theta}_x$ should be equivalent to ${\mu}_{max}$ in units, but exhibited the significant difference between theses two values. Therefore, it is considered that high safety factors are requested in the design of anoxic activated sludge process that is based on Monod bio-kinetics of microorganism.

판지공장 인쇄폐수에 무산소 활성오니공정을 적용한 결과 $TCOD_{Mn}=90{\sim}94%$, $Color=58{\sim}81%$의 높은 제거효율을 얻었다. 산업현장 판지공장 폐수에 대한 무산소 활성오니공정의 설계분석을 위하여 Monod식에 의한 동력학적계수를 추정한 결과 $K_{max}$(최대 기질제거속도)=0.52 $day^{-1}$, $K_s$(반포화 기질농도)=314 mg/L, $K_d$(내생호흡계수)=0.274 $day^{-1}$, y(미생물의 합성계수)=0.908 mg/mg, ${\mu}_{max}$(최대 비생장속도)=0.472 $day^{-1}$로 산출되었다. 설계분석을 위한 부하인자의 값은 F/M비=$0.043{\sim}0.07$ kg-$TCOD_{Mn}$/kg-SS-day, BOD 용적부하=$0.18{\sim}0.3$ kg-$TCOD_{Mn}/m^3-day$, ${\theta}_x$(미생물 체류시간)=$=6.8{\sim}26.4$ day로 현장 검증되었다. 이러한 부하인자의 값을 미생물의 성장 동력학과 연계시켜 볼 때 F/M비는 ${\theta}_x$에 반비례하고, 단위측면에서 F/M비는 ${\mu}_{max}$와 같아야 하나 F/M비와 ${\mu}_{max}$는 상당한 차이가 있음을 알 수 있었다. 따라서 미생물의 성장 동력학을 이용한 무산소 활성오니공정을 설계하고자 할 때에는 충분한 안전율이 요구되는 것으로 사료되었다.

Keywords

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