碱性阴离子交换膜燃料电池用于消除微藻固碳过程中溶氧效应的实验研究

A tubular photobioreactor for efficiently cultivating chlorella is designed and built to solve the problem that the high concentration of dissolved oxygen generated in the microalgae solution would inhibit the growth of algal cells and reduce the efficiency of CO₂ fixation. A new perspective idea is proposed to remove the dissolved oxygen in the microalgae suspension with electrochemical method. Results indicate that the tubular photobioreactor performs better than Erlenmeyer flask on chlorella cultivation. The concentration of chlorella reaches 769 mg/L after 10 cultivation cycles, and it is ten times of the initial concentration. By employing the anion-exchange membrane direct glucose duel cell (AEM-DGFC) with Pt-free electrodes to consume the dissolved oxygen in the microalgae suspension for 4 hours, the dissolved oxygen content decreases from 18.35 mg/L to 6.19 mg/L, and the dissolved oxygen content reduces by 66.3%. In addition, the peak power density of AEM-DGFC reaches 81 W/m², which is superior to the cell with pure oxygen as the oxidant in the cathode. It is concluded that by the aid of AEM-DGFC, the dissolved oxygen is consumed efficiently. On the other hand, the electric energy is output and the energy consumption of the system is reduced.