http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Manickam Matheswaran,문일식 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
The ozonation of phenol wastewater treatment system has been investigated with effective mass transfer between gas and liquid phase in a bubble column reactor. The designed bubble column reactor was investigated for increasing the rate of mass transfer of ozone, the rate of oxidation of phenol in the solution, the solubility and decomposition rate of ozone in the distilled water were also studied at different flow rates. The decomposition rate constants were calculated based on pseudo first order kinetics. The oxidation of phenol was investigated in order to provide the overall reaction rate constant for the reaction between ozone and phenol at 25℃. The influence of the operating parameters like initial phenol concentration, ozone flow rate and pH for the destruction of phenol by ozonation were studied. The pseudo first order rate constant was depending on the initial concentration of phenol solution. A comparison of TOC removal percentage between bubble column reactor and bubble diffuser using ozonation were reported.
Manickam Matheswaran,Subramanian Balaji,Sang Joon Chung,문일식 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
The electrochemical oxidation of cerium(III) was carried out using divided and undivided electrochemical cells in nitric acid medium. It was found that divided cell with Nafion 324 as the separator gave good conversion yield with high current efficiency compared to the undivided cell. The efficiency of the divided electrochemical cell was further optimized in terms of cell voltage, temperature, flow rate of solution recirculation, concentrations of Ce(III) and nitric acid. The better conditions for 1 M Ce(III) in 3 M nitric acid were found to be 2.5 V, 363 K and 100 mL/min recirculation flow rate based on the current efficiency under the experimental conditions investigated. The Ce(IV) oxidant produced was used as a mediator for the mineralization of phenol. The mineralization efficiency of the cerium mediated electrochemical oxidation was found rapid and higher compared to the direct electrochemical oxidation based on CO2 evolution under the same conditions.
Matheswaran, Manickam,Balaji, Subramanian,Chung, Sang-Joon,Moon, Il-Shik Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
The electrochemical oxidation of cerium(III) was carried out using divided and undivided electrochemical cells in nitric acid medium. It was found that divided cell with Nafion 324 as the separator gave good conversion yield with high current efficiency compared to the undivided cell. The efficiency of the divided electrochemical cell was further optimized in terms of cell voltage, temperature, flow rate of solution recirculation, concentrations of Ce(III) and nitric acid. The better conditions for 1 M Ce(III) in 3 M nitric acid were found to be 2.5 V, 363 K and 100 mL/min recirculation flow rate based on the current efficiency under the experimental conditions investigated. The Ce(IV) oxidant produced was used as a mediator for the mineralization of phenol. The mineralization efficiency of the cerium mediated electrochemical oxidation was found rapid and higher compared to the direct electrochemical oxidation based on CO2 evolution under the same conditions.
Cobalt(III)-mediated oxidative destruction of phenol using divided electrochemical cell
문일식,Manickam Matheswaran,Sang Joon Chung 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.5
Mediated electrochemical oxidation is one of the suitable processes for the destruction of hazardous organic compounds and the dissolution of nuclear wastes at ambient temperature and pressure. The electrochemical oxidation of Co(II) was carried out in an undivided and divided electrochemical cell. The formation of Co(III) was studied in an divided electrochemical cell by varying conditions such as temperature and concentration of nitric acid in a batch type electrochemical reactor in recirculation mode. It was found that the formation of Co(III) increased with increasing nitric acid concentration and decreased with increasing temperatures. The produced Co(III) oxidant was then used for the destruction of phenol. It was noted that phenol could be mineralized to CO2 and water by Co(III) in nitric acid under different nitric acid concentrations and temperatures. The evolved CO2 was continuously measured and used for the calculation of destruction efficiency. The destruction was increased with increasing nitric acid concentration as well as the temperature. The maximum efficiency was observed to be 78% based on CO2 evolution for 5,000 ppm phenol solution at 60 oC in a continuous feed mode. The destruction efficiency was increased 28% by addition of silver at 25 oC.
문일식,Manickam Matheswaran,Subramanian Balaji,Vasily V. Kokovkin,Sang Joon Chung 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.5
operation units for the successful working mediated electrochemical oxidation (MEO) proces. In this study, elec-trochemical cells with DSA electrodes of two types, single stack and double stack connected in series, were used. Theperformances towards the electrochemical generation of Ce(IV) in nitric acid media at 80oC were studied. The cur-rent-voltage curves and cerium electrolysis kinetics showed the dependence on number of cell stacks needed to be con-nected in series for the destruction of a given quantity of organic pollutant. The presence of an optimum region forCe(III) oxidation with a contribution of oxygen evolution, especially at low Ce(III) concentration (high conversiontor processes were fited in a simple model proposed and used to calculate the curent needed in terms of Ce(III) oxi-dation rate and the number of cel stacks required for maintaining Ce(IV)/Ce(III) ratio at the same level during the organicdestruction. This consideration was based on the kinetic model previously developed by us for the organic destructionin the MEO proces.
Thiruvenkatachari, Ramesh,Manickam, Matheswaran,Ouk Kwon, Tae,Shik Moon, Il,Woo Kim, Jae Taylor Francis 2006 Separation science and technology Vol.41 No.14
<P>This study investigates the effect of operation parameters on the separation of nitric acid‐water mixture using air gap membrane distillation (AGMD). Porous hydrophobic PTFE membrane was used. The performance was evaluated based on the permeate flux and the nitric acid selectivity. Operating parameters such as feed solution temperature, feed concentration, flow rate, and air gap width were varied. Nitric acid selectivity was found to increase with the increase in feed solution temperature, feed concentration, flow rate, and air gap width. Permeate flux increased, when the feed temperature and the flow rate were increased. The effect of recirculation of the feed solution was also studied. With the recirculation mode, at different initial solution volumes, it was observed that the nitric acid concentration in the feed and the permeate, increased. The rate of flux decline was greater, when the initial feed solution volume was lower.</P>