Desorptive behavior of pentachlorophenol (PCP) and phenanthrene in soil-water systems

Journal Article · Sat Apr 01 04:00:00 EST 2000 · Water Environment Research

DOI:https://doi.org/10.2175/106143000X137239· OSTI ID:20080404

Fall, C; Chaouki, J; Chavarie, C

Recent investigations have prompted the need for a better understanding of the complete desorptive behavior of hydrophobic organic compounds in soils. The present study evaluated the irreversibilities associated with the desorption of pentachlorophenol (PCP) and phenanthrene from different types of soils. The study also examined the influence of solid-liquid ratio of the current batch desorption tests, specifically the completeness and accuracy of data gathered for establishing isotherms. Results demonstrated that the desorption of PCP and phenanthrene from contaminated soils can lead to three different types of behavior: complete reversibility, partial reversibility, or total irreversibility. The equilibrium adsorption constant (K{sub d}) is identified as a key parameter that indirectly sets the extent of hysteresis during the reverse process of desorption. According to the data, irreversibility occurs more in soils with a large adsorption capacity, that is, when K{sub d} is approximately 50 mL/g or more in the case of the phenanthrene- and PCP-soil systems evaluated. Furthermore, to facilitate the desorption experiments overall, the study proposes selection criteria for the solid-liquid ratio of batch tests to allow for variations in the adsorption capacity of each soil.

• OSTI ID: 20080404
• Journal Information: Water Environment Research, Journal Name: Water Environment Research Journal Issue: 2 Vol. 72; ISSN WAERED; ISSN 1061-4303
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHLORINATED AROMATIC HYDROCARBONS
DESORPTION
ENVIRONMENTAL TRANSPORT
PHENANTHRENE
POLLUTION
SOILS