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Reduction of H2S in anaerobic digestion of sewage wastes
박영규,박영규 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In order to make the best biogas production in the anaerobic fermentation, it is important to be able to compare the raw input materials on the basis of their sustainability, which may include a variety of environmental indicators. This study examined the comparative sustainability of renewable technologies in terms of their life cycle CO2 emissions andembodied energy, using life cycle analysis. The comparative results showed that power generation of bioenergy was associated with 0.96 kWh/m3 biogas and the reduction of CO2 emission is 2.1kg of CO2/kg Biomass. Other environmental indicators should be applied to gain a complete picture of the technologies studied. The generation of electricity is 2.07 kWh/m3 biogas in comparison with theoretical results of 3.09 kWh/m3 (efficiency of generator is 30%) based on the assumption of the removal efficiency 95% of CO2, methane conversion 100%, efficiency of generator 30%. Final results are the production of methane: 250 m3/day, production of electricity: 770kWh/day when used 5m3/day of waste.
Recycling of surfur using chelate absorption reactor
박영규,박영규 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Several experiments have done to investigate the removal of hydrogen sulfide(H2S) synthetic gas from biogas streams by means of chemical absorption and chemical reaction with 0.1M - 1M Fe/EDTA solution. The hydrogen sulfide of biogas was bubbled through an gas-lift column with Fe/EDTA resulting in the formation of sulfur particles. Wide range of optimal operating conditions were tested for both Fe/EDTA solution and the biogas, and the optimal ratio of Fe/EDTA concentration for efficient removal of hydrogen sulfide was found. The roles of Fe/EDTA were studied to enhance the removal efficiency of hydrogen sulfide because of oxidizing by Fe+3/EDTA. The motivation of this investigation is first to explore the feasibility of enhancing the toxic gas treatment in the biogas facility. The biogas purification strategy affords many advantages. For instance, the process can be performed under mild environmental conditions and at low temperature, and it removes hydrogen sulfide selectively. The end product of separation is elemental sulfur, which is a stable material that can be easily disposed of with minor potential for further pollution. The process to address over 90% removal efficiency of hydrogen sulfide does offer considerable advantages unrealized.
박영규 가야대학교 2002 가야대학교 논문집 Vol.11 No.-
Shared nothing multiprocessor architecture is known to be more scalable to support very large databases. In this paper, we analyze and compare five parallel join algorithms -Grace, Hybrid hash, Simple hash, ADJ+ and sort-merge- in shared nothing architecture. Grace, Hybrid hash and ADJ+ represent the class of hash-based join methods. Simple hash represents a looping algorithm with hashing, and sort-merge is the more traditional algorithm. In addition, we study facts to deteriorate performance of the join algorithm, and propose technique to upgrade system performance.