光生物反应器脱除空气中CO2的模型研究

微藻光生物反应器具有脱除空气中CO_2能力。从光生物反应器构型、进气流速、混合传质,及微藻光合/呼吸速率等方面,探讨气升式光生物反应器脱除空气中CO_2效果,提出了时间离散化和集中参数法两种分析方法。运用集中参数法建立了气升式柱型光生物反应器脱除CO_2的数学模型,模拟了藻液中溶氧浓度(DO)、pH随时间的变化情况,及进气CO_2浓度影响,预测并验证了光照条件下出气CO_2、O_2浓度的变化趋势。模拟结果和实验数据基本吻合,所提出的模型对光生物反应器的优化设计、微藻的高密度培养,及CO_2去除能力预测具有参考意义。

Model Study on CO2 Removal by Photobioreactor

The key point of study on CO_2 removal by microalgae cultured in a photobioreactor is to improve CO_2 removal capability. In this paper,a model of air-lift photobioreactor was developed by combination of conditions including the velocity of flow,the degree of mixing,the gas-liquid mass transfer and the rate of photosynthesis,and two corresponding simplified methods,such as time discretization and lumped parameters were put forward. Using a method of lumped parameters,the model for simulation of time course of DO,pH in the column air-lift photobioreactor and prediction of CO_2,O_2 concentrations in the outlet gas under different CO_2 concentration in the aeration gas was thoroughly discussed. Experimental data were also used to verify the model which could potentially be applied to rational design of the photobioreactor,high-density culture of microalgae and efficient removal of CO_2.