title: Ultrasound assisted, thermally activated persulfate oxidation of coal tar DNAPLs.
abstract: The feasibility of ultrasound assisted, thermally activated persulfate for effective oxidation of twenty 2-6 ringed coal tar PAHs in a biphasic tar/water system and a triphasic tar/soil/water system were investigated and established. The results indicate that ultrasonic assistance, persulfate and elevated reaction temperature are all required to achieve effective oxidation of coal tar PAHs, while the heating needed can be provided by ultrasonic induced heating as well. Further kinetic analysis reveals that the oxidation of individual PAH in the biphasic tar/water system follows the first-order kinetics, and individual PAH oxidation rate is primary determined by the mass transfer coefficients, tar/water interfacial areas, the aqueous solubility of individual PAH and its concentration in coal tar. Based on the kinetic analysis and experimental results, the contributions of ultrasound, persulfate and elevated reaction temperature to PAHs oxidation were characterized, and the effects of ultrasonic intensity and oxidant dosage on PAHs oxidation efficiency were investigated. In addition, the results indicate that individual PAH degradability is closely related to its reactivity as well, and the high reactivity of 4-6 ringed PAHs substantially improves their degradability.
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Libin
authors.initials: L
authors.lastname: Peng
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Xingting
authors.initials: X
authors.lastname: Hu
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Peihui
authors.initials: P
authors.lastname: Wu
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Xueqing
authors.initials: X
authors.lastname: Wang
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Chumei
authors.initials: C
authors.lastname: Huang
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China.
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Wang
authors.affiliation: Guangdong Provincial Key Lab of Functional-materials for Environmental Protection, School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong 510006, China. Electronic address: ddeng@alumni.princeton.edu.
authors.forename: Dayi
authors.initials: D
authors.lastname: Deng
keywords: Activated persulfate; Coal tar; Dense non-aqueous phase liquid; In situ chemical oxidation; Ultrasound