굴껍질 및 바이오차를 이용한 산성물질 유출 토양의 복원효과 평가

Acid-spilled accidents have frequently occurred in recent years, related to hydrofluoric acid and hydrochloric acid. The objective of this study was to evaluate the potential use of oyster shell and biochar derived from wood wastes for the remediation of acidified soil by acid-spilled accidents. The initial soil was spiked with 1 N H2SO4 solution to reach the final soil pH of 3.73, as an artificial acidic soil or control in this study. Single or combination of oyster shell and biochar was used at the rates of 2.5 and 2.0%, respectively. After 45 days incubation, the exchangeable cations in the control soil were sharply decreased by due to nutrient leaching by acidic soil pH. For the soil amended with oyster shell, the soil pH increased to 5.97 and the cation exchangeable capacity (CEC) also increased by 10 times greater than the control. The CO2 emission was the highest in the soil treated with combination of oyster shell and biochar compared to the control or other amendments. It can be explained with increasing soil microbial activity with oyster shell and biochar. This finding speculates that the combined use of oyster shell and biochar may induce the enhancement of soil microbial activity by their interaction. In summary, the combined use of oyster shell and biochar could be the best in neutralizing acidic soil pH and enhancing soil microbial activity.