Remediation approach for organic compounds and arsenic co-contaminated soil using the pressurized hot water extraction process

ABSTRACT

Successful remediation of soil with co-existing organics contaminants and arsenic (As) is a challenge as the chemical and remediation technologies are different for each group of pollutants. In this study, the treatment effectiveness of the pressurized hot water (PHW) extraction process was investigated for remediation of soil co-contaminated with phenol, crude oil, polycyclic aromatic hydrocarbons (PAHs), and As. An elimination percentage of about 99% was achieved for phenol, and in the range of 63–100% was observed for the PAHs at 260°C for 90 min operation. The performance of PHW extraction in the removal of total petroleum hydrocarbons was found to be 86%. Of the 87 mg/kg of As in untreated soil, 67% of which was eliminated after treatment. The removal of organic contaminants was mainly via desorption, dissolution and degradation in subcritical water, while As was eliminated probably by oxidation and dissolution of arsenic-bearing minerals. According to the experimental results, the PHW extraction process can be suggested as an alternative cleaning technology, instead of using any organic solvents for remediation of such co-contaminated soil.

KEYWORDS:

• Pressurized hot water
• extraction
• TPH
• PAHs
• co-contaminated soil

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Mohammad Nazrul Islam http://orcid.org/0000-0003-0162-9655

Additional information

Funding

This work was financially supported by the Korea Environment Industry and Technology Institute through the GAIA project [grant number 2014000550002] and funded by the National Research Foundation of The Republic of Korea [grant number 2016R1A2B4008115].