REMEDIATION OF TPH-CONTAMINATED SOIL BY COMBINATION OF SOIL WASHING AND ELECTROKINETIC TECHNIQUE

• Main Authors: JUNG, HONG BAE, JEON, CHIL SUNG, SONG, HYUN JOO, SIM, DOO SUP, PARK, JAE HYUN, KO, SUNG HWAN, RYU, BYUNG GON, CHO, JUNG MIN, BAEK, KI TAE, PARK, SUNG WOO, KIM, YONG HYUN, KOO, BON SAM
• Format: Patent
• Language: English
• Published: 05.09.2008
• Subjects: DISPOSAL OF SOLID WASTE; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING

A remediation method of TPH-contaminated soil by a combination of soil washing and electrokinetic technique is provided to minimize the generation of waste from the treatment of the contaminated soil by easily removing contaminants from clayey soil using advantages of electrokinetic remediating technique after promptly removing oil from sandy soil while performing a wet process of separating particle sizes of oil-contaminated soil. A method for the remediation of TPH(total petroleum hydrocarbon)-contaminated soil comprises the steps of: treating the TPH-contaminated soil by soil washing and performing a wet process of separating particle sizes of the TPH-contaminated soil to separate remediated sandy soil with a particle size of at least 0.1 mm and non-remediated fine soil with a particle size of less than 0.1 mm from the TPH-contaminated soil; injecting the separated fine soil that has not been remediated by soil washing into a vessel in which an anode chamber having an anode formed at both ends thereof and a cathode chamber having a cathode formed at both ends thereof are formed; and supplying an electric current to the electrodes to obtain a current density of 0.1 to 10 mA/cm^2 or a voltage ramp of 0.1 to 10 V/cm, supplying a washing solution containing an electrolyte to the anode chamber, and moving the electrolyte-containing washing solution through the fine soil by an electric field of the cathode chamber to remediate the TPH-contaminated soil. Further, the electrolyte is MgSO4, NaOH, NaCl or NaNO3.