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장성호,김고은,배종명,홍성철,서정민,이재용,박진식,문추연 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.7
The use of Soluble Cutting Fluids (SCF) is essential in the development of industrial technology. However, it is difficult to decompose biologically due to its high concentrations of organic substances and nitrogen compounds, which interfere with microbial growth. Recently, Advanced Oxidation Processes are being studied both domestically and internationally. Electrolysis is highly adaptable industrial wastewater treatment because it has high removal efficiency and short processing time, regardless of the contaminant’s biodegradable nature. Accordingly, this study shows the characteristics of total nitrogen removal in SCF on the operating time, current density, and electrolytes when using aluminum in a batch-type reactor. The results are as follows: ① Under the condition of without the electrolyte when the current density was adjusted to 40 A/m2, 60 A/m2, or 80 A/m2, the respective T-N removal efficiencies were 71.7%, 80.6%, and 87.2% at 60 min. ② In the comparison for the condition of whether NaCl was added, the removal efficiency of adding NaCl (5 ~ 10 mM) was higher than non-addition at 60 min for all current densities. ③ In the comparison for the condition of whether Na2SO4 (5 ~ 10 mM) was added, the removal efficiency when adding Na2SO4 showed no significant difference compared to non-addition at 60 min for all current densities.
장성호,김고은,배종명,이병인,시바쿠마르,정은상,이재용,박진식,류재용 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.8
As industry continues to develop, the amount of various recalcitrant substances that cannot be removed by conventionalwastewater treatment has increased in modern society. The SCFs (Soluble Cutting Fluids) used in metalworking processescontain many chemical substances, such as mineral oils, anticorrosive agents, extreme-pressure additives and stabilizers,as well as high concentrations of organics. Recently, electrolysis has been expected to become an alternative toconventional processes and to be useful in various wastewater treatments. Electrolysis is a highly adaptable industrialwastewater treatment method, having a high efficiency, short processing time, and simple equipment composition,regardless of the biodegradable nature of the contaminants. The effects of operating time, current density, and electrolyteon COD removal of waste SCFs have been studied using the stainless steel (SUS316) electrode in a batch type reactor. The results were as follows. ① Without electrolytes, when the current density was adjusted to 40 A/m2, 60 A/m2, and80 A/m2, the removal efficiencies of the COD were 25.0%, 37.7%, and 49.1% after 60 min, respectively. ② In thecomparison between NaCl (5 ~ 10 mM) addition and non-addition, the removal efficiency with NaCl was higher than forwithout after 60 min for all current densities. ③ In the comparison between Na2SO4 (5 ~ 10 mM) addition and nonaddition,the removal efficiency with Na2SO4 showed no significant difference to that with NaCl at all current densities
장성호,정영빈,배종명,홍성철,서정민,이병인,이재용,박진식,문추연 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.8
The mother machine makes the necessary shape by processing materials such as metal. The SCFs are applied to theprocessing surface when the mother machine processes the material, thereby improving the cutting conditions. SCFscontain high concentrations of organic components and nitrogen compounds, which can cause problems such aseutrophication and algae bloom. Therefore, proper treatment is required. Electrochemical treatment is expected to be analternative to conventional processes, and to be useful in various wastewater treatments. Moreover, it is an efficientelimination technique for contaminants and has a simple equipment composition. In this study, the removal efficiency ofthe T-N contained in the waste SCF using electrochemical treatment is analyzed. The electrode was made of titaniumand iridium, made into a perforated metal sheet to prevent an imbalance of the sample concentration in the reactor. Experiments were conducted to examine the effects of current density and the concentration of the supporting electrolyte(NaCl, Na2SO4) on removal efficiency. In the cases with 60 A/m2, 80 A/m2, and 100 A/m2 current densities, the removalefficiencies of the T-N contained in the waste SCF were 51.03%, 68.83%, and 79.58%. Comparing between the additionand non-addition of NaCl, the removal efficiency with the addition of NaCl (5 ~ 10 mM) was higher than for no additionat 60 min for all current densities. The addition of Na2SO4 increased the removal rate of the T-N, but it was less effectivethan NaCl addition
장성호 ( Seong-ho Jang ),정영빈 ( Young-been Jeong ),배종명 ( Jong-myeong Bae ),( S. Sivakumar ),정은상 ( Eun-sang Jung ),박제성 ( Je-sung Park ),홍순헌 ( Soon-heon Hong ),이승훈 ( Seung-hun Lee ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.5
In general, the electrochemical treatments, organic materials by oxidation and reduction on electrode surfaces, are regarded as simpler and faster processes for removal of pollutants compared to other wastewater treatments. In this study, The removal of Chemical Oxygen Demand (COD) of Wasted Soluble Cutting Fluids was investigated using electrochemical treatment Aluminium (Al) as electrode. Experiments were conducted to examine the effects of current density, the concentration of supporting electrolyte (NaCl, Na<sub>2</sub>SO<sub>4</sub>) on removal efficiency. Experimental data in relation to current density and concentration of electrolyte are outlined. As a result of analyzing the COD removal efficiency according to the current density without electrolyte addition, the final removal rates were 48.33% (40 A/㎡), 65.63% (60 A/㎡) and 78.28% (80 A/㎡). As the current density increased, the COD removal rate increased. When adding electrolytes in all current density conditions, the removal rate was increased. however, Compared with before and after electrolyte addition, NaCl addition increased the average removal rate by 7.86% and Na<sub>2</sub>SO<sub>4</sub> increased by 5.18%.