Removal of organic contaminants from water or wastewater with liquefied gases

Article type: Research Article

Authors: Yang, Chun | Teo, Khay-chuan | Xu, Yan-rong

Affiliations: Division of Chemistry, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616. E-mail: kcteo@ nie.edu.sg;[email protected]

Abstract: This study utilized liquefied gases (LG) as extractant to remove various organic contaminants including halogenated hydrocarbons and phenols as well as aromatic compounds from aqueousmatrices. Orthogonal experiments were performed to optimize theoperating conditions such as temperature, co-solvents and so on.Under favorable conditions, high removal efficiencies can be readily achieved for a great number of representative model organiccontaminants, the removal efficiencies for most of the hydrophobic contaminants were greater than 90% in a single extraction stage.Tentative effort was also done for the removal of extracted contaminants from recycled liquefied gases.

Keywords: liquefied gases, butane, extraction, organic, contaminants, water

Journal: Journal of Environmental Sciences, vol. 14, no. 1, pp. 1-16, 2002