• 공업화학
• /
• 제19권3호
• /
• pp.277-286
• /
• 2008

본 논문은 미생물 성장 공정에서의 기질 저해에 관한 modified Haldane 모델의 이론적 유도를 다룬다. 생물학적 개념인 기질-수용체 복합체의 작동 메커니즘을 바탕으로 새로운 미생물학적 동특성인 N-중첩된 다중 기질 저해 모델의 유도와 더불어 일반화가 이론적으로 고찰되었는데, 이것은 효소 반응에서의 단순 기질 저해 메커니즘이 자연스럽게 확장된 것이다. 결과적으로, 본 기질 저해에 관한 modified Haldane 모델은 완전저해 기질농도라는 생물학적 상수를 포함하고 있는, 잘 설계된 4-파라메터 동특성 모델임이 밝혀졌다.

• Journal of Microbiology and Biotechnology
• /
• 제18권6호
• /
• pp.1130-1135
• /
• 2008

The effect of pH on anaerobic hydrogen production was investigated under various pH conditions ranging from pH 3 to 10. When the modified Gompertz equation was applied to the statistical analysis of the experimental data, the hydrogen production potential and specific hydrogen production rate at pH 5 were 1,182 ml and 112.5 ml/g biomass-h, respectively. In this experiment, the maximum theoretical hydrogen conversion ratio was 22.56%. The Haldane equation model was used to find the optimum pH for hydrogen production and the maximum specific hydrogen production rate. The optimum pH predicted by this model is 5.5 and the maximum specific hydrogen production rate is 119.6 ml/g VSS-h. These data fit well with the experimented data($r^2=0.98$).

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2001년도 ICCAS
• /
• pp.74.3-74
• /
• 2001

This paper proposes a nonlinear adaptive controller based on back-stepping method for tracking reference substrate concentration by manipulating dilution rate in a continuous baker´s yeast cultivating process in stirred tank bioreactor. Control law is obtained from Lyapunov control function to ensure asymptotical stability of the system. The Haldane model for the specific growth rate depending on only substrate concentration is used in this paper. Due to the uncertainty of specific growth rate, it has been modified as a function including the unknown parameter with known bounded values. The substrate concentration in the bioreactor and feed line are measured. The deviation from the reference is observed when the external disturbance such as the change of the feed is introduced to the system ...

• Transactions on Control, Automation and Systems Engineering
• /
• 제4권4호
• /
• pp.277-282
• /
• 2002

This paper proposes a nonlinear adaptive controller based on back-stepping method for tracking reference substrate concentration by manipulating dilution rate in a continuous baker's yeast cultivating process in stirred tank bioreactor. Control law is obtained from Lyapunov control function to ensure asymptotical stability of the system. The Haldane model for the specific growth rate depending on only substrate concentration is used in this paper. Due to the uncertainty of specific growth rate, it has been modified as a function including the unknown parameter with known bounded values. The substrate concentration in the bioreactor and feed line are measured. The deviation from the reference is observed when the external disturbance such as the change of the feed is introduced to the system. The effectiveness of the proposed controller is shown through simulation results in continuous system.

• Environmental Engineering Research
• /
• 제22권4호
• /
• pp.417-425
• /
• 2017

Indonesia is known as the largest oil palm producer in the world. However, along with the production, it generates wastes and pollution that caused the environmental problem in surrounding areas. Previous researchers reported that the high palm oil mill effluent (POME) concentration inhibited microalgae growth. However, the inhibition factor was not clearly explained by using kinetic model. This study presents kinetic models of Botryococcus braunii (B. braunii) cultivated on POME wastewater under different turbidity condition. Results showed that the growth model of Zwietering was closely suitable with experimental results. It was found that B. braunii was able to consume organic carbon from the POME wastewater on the logarithmic model. A modified kinetic model of Monod Haldane described the influence of turbidity and chemical oxygen demand on the cultivation. Turbidity of POME medium inhibited the growth rate at KI 3.578 and KII 179.472 NTU, respectively. The Lipid (39.9%), and carbohydrate (41.03%) were found in the biomass that could be utilized as biofuel source.

• 대한환경공학회지
• /
• 제29권1호
• /
• pp.54-61
• /
• 2007

pH가 혐기성 수소 발효에 미치는 영향을 고찰하기 위해 배양기간 동안 pH를 $3\sim10$까지 일정하게 유지시킨 상태에서 수소생산 효율을 살펴보았다. 유입기질을 sucrose로 하여 생성된 가스는 이산화탄소와 수소였으며 메탄가스는 검출되지 않았다. 수정 Gompartz 방정식을 이용하여 수소가스 발생량$(P_h)$과 최대수소 생성율$(R_h)$을 회귀분석하였을 때 pH 5에서 수소가스 발생량$(P_h)$은 약 1182 mL이고 최대수소 생성율$(R_h)$은 112.46 mL/g dry wt biomass/hr이였다. 수소 전환율은 22.56%이였으며 butyrate/acetate 비가 pH 5에서는 1.63, pH 6에서는 0.38로 ratio값이 높은 pH 5에서 효율이 더 좋다는 것을 확인할 수 있었다. Haldane equation을 이용하여 비수소생산율을 산정해 본 결과 최대 비수소생산율은 119.61 mL/g VSS/hr이였고, 최대 비수소생산율을 나타내는 pH는 5.5로 판명되었다.