Semi-batch Jet Loop Reactor에서 연소 배가스중 CO2를 이용한 알칼리 폐수 중화
Neutralization of Synthetic Alkaline Wastewater with CO2 in a Semi-batch Jet Loop Reactor
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In this study, we tested the absorption of CO2 in combustion gas into an alkaline wastewater to simultaneously control CO2 and wastewater. During the experiment, we investigated the effects of operating parameters on neutralization characteristics of the wastewater by using CO2 in a bench-scale semi-batch jet loop reactor (0.1 m diameter and 1.0 m in height). The operating parameters investigated in the study are gas flow rate of 1.0-2.0 L/min, liquid recirculation flow rate of 4-32 L/min, and liquid temperature of 20-25℃. It was shown that the initial pH of wastewater rapidly decreased with increased gas flow rate for a given liquid recirculation flow rate. This was due to the increase in the gas holdup and the interfacial area at higher gas flow rate in the reactor. At constant gas flow rate, the time required to neutralize the wastewater initial pH of 10.1 decreased with liquid recirculation flow rate (QL), reached a minimum value in the range of QL = 16-24 L/min, and then increased with further increase in QL. Further, the time required to neutralize the wastewater was shortened at higher temperatures.
Abstract
In this study, we tested the absorption of CO2 in combustion gas into an alkaline wastewater to simultaneously control CO2 and wastewater. During the experiment, we investigated the effects of operating parameters on neutralization characteristics of the wastewater by using CO2 in a bench-scale semi-batch jet loop reactor (0.1 m diameter and 1.0 m in height). The operating parameters investigated in the study are gas flow rate of 1.0-2.0 L/min, liquid recirculation flow rate of 4-32 L/min, and liquid temperature of 20-25℃. It was shown that the initial pH of wastewater rapidly decreased with increased gas flow rate for a given liquid recirculation flow rate. This was due to the increase in the gas holdup and the interfacial area at higher gas flow rate in the reactor. At constant gas flow rate, the time required to neutralize the wastewater initial pH of 10.1 decreased with liquid recirculation flow rate (QL), reached a minimum value in the range of QL = 16-24 L/min, and then increased with further increase in QL. Further, the time required to neutralize the wastewater was shortened at higher temperatures.
참고문헌 (14)
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