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Kim S.,Samsung | Choi K.,Green and Global In Technology Co. | Chung J.,Samsung
International Journal of Hydrogen Energy | Year: 2013

Biological methane production is a more environmentally friendly technology for carbon dioxide reduction than physical and chemical methods. Carbon dioxide can be reduced biologically to methane with hydrogen as the reducing agent under anaerobic conditions. In this study, carbon dioxide discharged from the electronics industry was reduced biologically to methane using the hydrogen produced from electrochemical wastewater treatment. Electrocoagulation technology was applied to treat industrial wastewater and obtain hydrogen without oxygen production. On mixing and injecting the hydrogen and carbon dioxide that were emitted from the facility into an anaerobic reactor, the methane content that was discharged from the anaerobic reactor and the reduction rate of carbon dioxide were 92% and 98%, respectively. This technology, combined with electrocoagulation and biological reaction, reduces carbon dioxide levels and produces methane. Source

Kim S.,Samsung | Choi K.,Green and Global In Technology Co. | Kim J.-O.,Hanyang University | Chung J.,Samsung
New Biotechnology | Year: 2016

The use of gas dissolution devices to improve the efficiency of H2 dissolution has enhanced CO2 reduction and CH4 production. In addition, the nutrients that initially existed in anaerobic sludge were exhausted over time, and the activities of anaerobic microorganisms declined. When nutrients were artificially injected, CO2 reduction and CH4 production rates climbed. Thus, assuming that the activity of the obligatory anaerobic microorganisms is maintained, a gas dissolution device will further enhance the efficiency of CO2 reduction and CH4 production. © 2015 Elsevier B.V.. Source

Chung J.,Samsung | Kim S.,Samsung | Choi K.,Green and Global In Technology Co. | Kim J.-O.,Hanyang University
Environmental Technology (United Kingdom) | Year: 2016

Microbacterium barkeri KCCM 10507 and Paenibacillus amylolyticus KCCM 10508 were isolated and identified for the degradation of polyvinyl alcohol (PVA) contained in textile waste water. Kinetic parameters such as growth rate and substrate utilization rate were determined using a pure culture of two isolated strains. The degradation rate by a mixed culture of two isolated strains was higher than that by single strain only. Also, the effect of polymerization degree on biodegradation was negligible, but initial PVA concentration was very sensitive to biodegradation. Forty-two per cent of PVA and 55% of chemical oxygen demand in textile waste water were removed by a mixed culture of two isolated strains after 5 days. © 2015 Taylor & Francis. Source

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