중금속으로 오염된 점성토의 정화에 대한 electrokinetic기술의 효율을 연구하기 위하여 포화 해성점토를 납으로 오염시켜 전기삼투시험을 수행하였다. 이를 위하여 실험조건으로서 납의 오염농도 500, 5,000, 50,000mg/kg, 공급전류 10, 50, 100mA, 가동시간 5, 15, 30일 및 3가지의 효율 향상기법을 적용하였다. 유입수와 유출수의 pH, 전기삼투유량 및 전기전도도를 시험중에 측정하고 또 시험 완료후에 공시체전 길이에 걸쳐 pH및 잔존 납농도를 측정하여 제시하였다. 시험결과에 의해서 electrokinetic 기술이 효과적인 방법이라는 결론을 얻었다. 또한 음극에 침강된 수산화납을 용해시키기위해 초산을 가하게 되면 정화효율이 향상된다는 사실을 알 수 있었다.
Electroosmotic tests were performed on saturated marine clay specimens contaminated with lead to investigate the efficiency of the electrokinetic technique for removal of heavy metals from the cohesive soils. For this purpose, testing program included variable conditions such as the concentration of lead (500, 5, 000, 50, 000mg/kg), the level of electrical current (10, 50, 100 mA), operating duration (5, 15, 30days), and the application of three dirtferent chemicals for enhancement in efficiency. The pH of inflow and outflow, electroosmotic flow and electrical conductivity during the test, and the pH and the concentration of lead across the specimen after the test are presented. Test results came to the conclusion that the electrokinetic technique was very effective to remove heavy metals such as lead from the contaminated cohesive soil. Adding ecetic acid at the cathod to dissolve the procipitates of lead hydroxide as found to be effective for the enhancement of the efficiency in remediation.
