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[Kichul*, 5(1): January, 2016] ISSN: 2277-9655 (I2OR), Publication Impact Factor: 3.785
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY
CHARACTERISTICS OF H2S REMOVAL BY HYDRODYNAMIC CAVITATION EFFECT
Kichul Cho*, Duckshin Park
Department of Bio Environmental Science, Dongnam Health College, Korea. Transportation Environmental Research Team, Korea Railroad Research Institute.
In this study, a cavitation effect was used to remove H2S which is one of the main causes behind complaints of offensive odors. The result of the optimization gas flow rate and water flow rate to remove H2S using the central composite method showed that the removal rate of H2S increases as the gas flow rate decreases and the water flow rate increases at the gas flow rate of 1.39 LPM and water flow rate of 2.16 LPM, the maximum removal rate of H2S through reaction optimization was estimated to be 96.1 %.
KEYWORDS: H2S, Hydrodynamic Cavitation Effect, Odor.
The rapid increase in the emission of atmospheric pollutants recently has caused serious environment problems, while public awareness of consequent unpleasant odors has also been increasing markedly as a result of improving living standards. One of the causes of the foul odors is the presence of hydrogen sulfide (H2S). H2S is a colorless substance that smells like rotten eggs and can cause suffocation, lung disease and neural paralysis
The technologies in handling offensive odors caused by emissions include absorption, adsorption, combustion, washing, and the use of catalysts and bio-filters. Each of these methods has positive and negative effects, and there are active ongoing studies into their relative effectiveness. The use of catalyst methods, for example, has proven to be highly efficient but it may be toxic and there are also other problems such as high reaction temperatures, high installation and maintenance costs, degradation of efficiency at higher concentrations, and the need for regular replacement. The adsorption method, such as the use of conventional activated carbon, is widely applied in commercial processes, but it’s low, and the adsorbent must be recharged in large amounts, thus the development of low cost and high performance adsorbents is needed. The bio-filter method is a technology that works by passing polluted gas through biologically active materials such as soil or compost. Although it has the
strength of having low capital and operating costs than physical or chemical processes and also discharges no secondary pollutants, it is vulnerable to pollution load, and the removal efficiency varies according to the type of
carrier and microorganism (Hodge et al., 1993; Hodge et al., 1994; Leson et al., 1991; Zilli et al., 1993).
In South Korea, absorption is used to process the offensive odors generated from most industrial complexes. However, the absorption method is problematic because of the low removal efficiency for some substances and though not focusing particularly on offensive odors, studies aimed at solving environmental issues by generating cavitation using hydrodynamic venturi tubes are currently ongoing (Muller et al., 1998). When fluid passes through the neck part of the venturi tube, i.e. the central part of the tube where it becomes constricted, air bubbles called cavitation bubbles are generated. The offensive odors can then be removed by high temperature shock waves as these cavitation bubbles are destroyed as they pass into area of the tube beyond the constriction where the pressure has recovered(Pandit and Joshi, 1993).
This study intends to conduct a test to discover the optimum gas input to remove H2S and water input to generate
cavitation in order to maximize the removal rate of the offensive odor substance H2S and to present a mathematical model using the central composite design method which is one of the response surface methodologies.
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