Hybrid Membrane Technologies with CO2 Mitigation and Resource Recovery

Carbon dioxide (CO2) is considered to play a significant role to maintain the balance of carbon in the ecosystem. In recent years, it has drawnmore attention because of its position as the primary greenhouse gas, implying the global warming. Intensive researches have been conducted onCO2 capture and recovery for further reuse or storage for developing more efficient and economic methods. Several technologies and strategies are being considered or used according to different applications. The most popular approach to this problem is Carbon Capture and Sequestration (CCS): the separation of CO2 emissions from power-plant flue gas, followed by the pressurization and sequestration of concentrated CO2 underground, for instance geological formations . However, the major concerns for storage are the proof of no or insignificantlosses and its credibility and acceptability as a safe, reliable and long-term storage. New technologies are urgently needed to meet the increasingly strong demand for CO2 mitigation. A novel hybrid membrane technology (Membrane Gas Absorption (MGA)-Membrane Crystallization (MCr)-Bipolar Membrane Electrodialysis (BMED) is put forward in this thesis to recover CO2 from flue gas. The general aim of this thesis is to evaluate the technical viability of the hybrid MGA-MC-BPED for CO2 capture and resource recovery. The main contents of this work are as follows: 1) To evaluate the possibility of NaOH production from wastewater by BMED in view of its further use as a CO2 absorbent; 2) To explore the effect of impurities on the membrane crystallization of Na2CO3 by hydrophobic porous hollow fiber membrane in view of CO2 mitigation; 3) To evaluate the potential of dense hydrophilic flat sheet RO membranes for Na2CO3 crystallization; 4) To analyze the application of biomimetic FO membranes for the crystallization of Na2CO3.nrpages: 128status: publishe