Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, United States.
Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, United States.
Bioresour Technol. 2014 May;159:24-9. doi: 10.1016/j.biortech.2014.02.062. Epub 2014 Feb 23.
Mineral carbonation can be used for CO2 sequestration, but the reaction rate is slow. In order to accelerate mineral carbonation, acid generated in a microbial electrolysis desalination and chemical-production cell (MEDCC) was examined to dissolve natural minerals rich in magnesium/calcium silicates (serpentine), and the alkali generated by the same process was used to absorb CO2 and precipitate magnesium/calcium carbonates. The concentrations of Mg(2+) and Ca(2+) dissolved from serpentine increased 20 and 145 times by using the acid solution. Under optimal conditions, 24 mg of CO2 was absorbed into the alkaline solution and 13 mg of CO2 was precipitated as magnesium/calcium carbonates over a fed-batch cycle (24h). Additionally, the MEDCC removed 94% of the COD (initially 822 mg/L) and achieved 22% desalination (initially 35 g/L NaCl). These results demonstrate the viability of this process for effective CO2 sequestration using renewable organic matter and natural minerals.
矿物碳化可以用于 CO2 封存，但反应速度较慢。为了加速矿物碳化，考察了微生物电解脱盐和化学产物电池（MEDCC）中产生的酸来溶解富含镁/钙硅酸盐（蛇纹石）的天然矿物，并用相同的过程产生的碱来吸收 CO2 并沉淀镁/钙碳酸盐。使用酸溶液，蛇纹石中溶解的 Mg(2+)和 Ca(2+)的浓度分别增加了 20 倍和 145 倍。在最佳条件下，在一个进料批次循环（24 小时）中，将 24mg 的 CO2 吸收到碱性溶液中，并沉淀 13mg 的 CO2 作为镁/钙碳酸盐。此外，MEDCC 去除了 94%的 COD（初始值为 822mg/L），并实现了 22%的脱盐（初始值为 35g/L NaCl）。这些结果表明，使用可再生有机物和天然矿物有效封存 CO2 的过程是可行的。
