Simultaneous Removal of Gas and Dust by Activated Carbon Coated Electrode

Abstract

This study aimed to develop a new dust collecting system equipped with an activated carbon (A.C.) coated electrode. Before fabrication, pre-treatment of A.C. was performed to remove metal ions within the A.C. to enlarge its specific surface area. Then, pre-treated A.C., black carbon, polyvinyl acetate (PVAc), and methanol were mixed to make a gel compound, which was coated onto aluminum plates to fabricate electrodes. The optimal mixing ratio of A.C., black carbon, PVAc, and methanol was found to be 10 g: 2 g: 3 g: 20 mL. After fabrication, the electrodes were used in the batch-type experiment for NH 3 and H 2 S removal. The reduction rates of the gases were high at the beginning and slowly reduced with time. Dust collection experiments were conducted in continuous flow, with various voltages applied. Compared to 5 kV, dust removal efficiency was 1.5 times higher when 10 kV was applied. Increasing the number of electrodes applied also increased the collecting efficiency. The correlation coefficient between actual collecting efficiency and trend line was higher than 99%. Consequently, the novel dust collection system equipped with A.C. coated electrode appears to be a promising substitute for existing dust-control devices.

Activated Carbon-Coated Electrode and Insulating Partition for Improved Dust Removal Performance in Electrostatic Precipitators

“…Methanol was added to ensure dispersion of the three ingredients and allow the application of an even coating onto the electrode surface. The optimum ratio of the components was found in previous research (Kim et al 2013) to be 10 g:2 g:3 g:20 mL of AC/BC/PVA/MeOH. The AC mixture was spread on the aluminum electrode surface, and the electrode was placed in a 100°C oven to remove the methanol.…”

“…Any material added as a binder may block the pores of the AC. The optimal mixing ratio of AC, CB, PVAc, and methanol and the best drying method were found in our previous research (Kim et al 2013). The PVAc functioned as a glue to bind the AC powder to the electrode surface, while methanol was added to prevent the thickening of the mixture.…”

“…The present authors suggested (Kim et al (2013)) the use of activated carbon as a coating for metal electrode surfaces to make electrodes with improved conductivity and electrosorption capacity. Activated carbon (AC) has been used in electrode fabrication in many ways, as a tool to increase specific capacitance, lower resistance, and increase specific surface area.…”

“…In the form of double layer capacitors, AC has demonstrated excellent performance as a high power density electrode in a variety of applications (Osaka et al 1999;Gamby et al 2001;Portet et al 2005;Zou et al 2008). AC-coated electrodes (Kim et al 2013) applied to simultaneous removal of dust and gaseous contaminants have exhibited as high as 90 % dust (3000-4000 μg/m 3 ) and gas (NH 3 and H 2 S) removal even with no corona discharge step, attributed to the increased electrical charge density. Thus, the desired dust collection efficiency was achieved without corona discharge and with high energy efficiency while preventing the generation of ozone and NO x .…”

Environmental Engineering Research in December 2013

“…Park and Choi [2] wrote about a risk assessment of environmental media such as soil, groundwater, and crops for people in the area of the abandoned Nokdong metal mine. Kim et al [3] developed a dust collection system equipped with activated carbon coated electrode that appears to be a promising substitute for existing dust-control devices. Choi and Lee [4] evaluated that Chlorella vulgaris can be successfully used to remove ammonia-nitrogen from wastewater.…”