Microbial Electrolytic Carbon Capture for Carbon Negative and Energy Positive Wastewater Treatment
| Autor: | Lu Lu, Zhe Huang, Greg H. Rau, Zhiyong Jason Ren |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Carbon Sequestration
chemistry.chemical_element Buffers Wastewater Carbon sequestration Electrolysis Water Purification Industrial wastewater treatment Electrolytes chemistry.chemical_compound Environmental Chemistry Electrodes Ions Bacteria Waste management Electric Conductivity General Chemistry Hydrogen-Ion Concentration Carbon Anode chemistry Environmental chemistry Carbon dioxide Thermodynamics Sewage treatment Hydrogen Negative carbon dioxide emission |
| Zdroj: | Environmental Science & Technology. 49:8193-8201 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.5b00875 |
| Popis: | Energy and carbon neutral wastewater management is a major goal for environmental sustainability, but current progress has only reduced emission rather than using wastewater for active CO2 capture and utilization. We present here a new microbial electrolytic carbon capture (MECC) approach to potentially transform wastewater treatment to a carbon negative and energy positive process. Wastewater was used as an electrolyte for microbially assisted electrolytic production of H2 and OH(-) at the cathode and protons at the anode. The acidity dissolved silicate and liberated metal ions that balanced OH(-), producing metal hydroxide, which transformed CO2 in situ into (bi)carbonate. Results using both artificial and industrial wastewater show 80-93% of the CO2 was recovered from both CO2 derived from organic oxidation and additional CO2 injected into the headspace, making the process carbon-negative. High rates and yields of H2 were produced with 91-95% recovery efficiency, resulting in a net energy gain of 57-62 kJ/mol-CO2 captured. The pH remained stable without buffer addition and no toxic chlorine-containing compounds were detected. The produced (bi)carbonate alkalinity is valuable for wastewater treatment and long-term carbon storage in the ocean. Preliminary evaluation shows promising economic and environmental benefits for different industries. |
| Databáze: | OpenAIRE |
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