|
DOI : 10.17640/KSWST.2020.28.6.113 , Vol.28, No.6, 113 ~ 126, 2020
|
| Title |
| Removal of Heavy Metal using Chemically Modified Biochar Produced from Wastewood |
| 김동수 Dong-su Kim , 최종수 Jong-soo Choi , 김세희 Se-hee Kim , 도지영 Ji-young Do , 박삼배 Sam-bae Park , 최유림 Yu-lim Choi , 장윤영 Yoon-young Chang , 양재규 Jae-kyu Yang |
|
|
|
| Abstract |
| Wastewater containing various harmful heavy metals is commonly generated from small businesses in the Seoul metropolitan area, and it may cause serious pollution to the soil, surface water and underground water due to improper treatment. In order to treat wastewater containing heavy metal ions, adsorption technique using carbon-based material is generally applied. Among several carbon-based material, biochar has much attention because it is known to have a large surface area and high cation exchange capacity. In this study, bio-char powder was manufactured by pyrolysis of waste wood in the range of 400 to 900°C and/or was modified using several acidic solutions such as chloroacetic acid, nitric acid and phosphoric acid to improve adsorption of heavy metals. In order to save energy, pyrolysis was performed with three methods, namely, microwave, low temperature Dry Oven and tube furnace. In the case of biochar obtained by pyrolysis with microwave, removal capability for Pb(II) and Cd(II) was 91.7 mg/g and 75.1 mg/g, respectively. In addition, when low temperature pyrolysis was performed using dry oven after phosphoric acid refinement, the removal capacity for Pb(II) and Cd(II) was 70.1mg/g and 60.8 mg/g, respectively. Finally, in the case of pyrolysis using tube furnace, removal capability for Pb(II) and Cd(II) was 89.7 mg/g and 67.7 mg/g, respectively. The biochar obtained from phosphoric acid-low temperature pyrolysis in dry oven is considered to be the most practical modified method considering possibility of mass production and saving of energy input, although it has less relative removal of heavy metal ions than tube-furnace and microwave oven (700 W). The results of this study show that the chemical modification of biomass using phosphoric acid and low-temperature pyrolysis can be potentially applied in the treatment wastewater contaminated with heavy metal ion in the future |
|
|
| Key Words |
| Adsorption, Biochar, Cadmium, Chemical Modification, Lead, Pyrolysis, 흡착, 바이오차, 카드뮴, 화학적 개질, 납, 열분해 |
|
|
|
|
|
PDF