The removal of Polycyclic Aromatic Hydrocarbons in the wastewater treatment process: Experimental calculations and model predictions

The behaviors and fate of polycyclic aromatic hydrocarbons (PAHs) in a coking wastewater treatment plant

“…7, only <1-3% of PAHs mass entering the plant were detectable in FE, and <1% in the gas by volatilization and air stripping, the remaining mass must undergo one or a combination of the following processes: separation with tar, transformation, or adsorption to particles and sludge that were removed from the aqueous stream and incorporated into sludge. Although some PAH's henry's law constants were greater than 1 Â 10 À4 atm m À3 mol À1 and the forced air was injected into the mixed liquor in biological stage, high boiling point (except acenaphthene, 217-550°C) and strong sorption potential (log K ow of 3.37-6.84) of these compounds induced the lower contribution of volatilization and air stripping, which was consistent with findings of Byrns (2001), Manoli and Samara (2008). Besides separation with tar and adsorption to sludge, which had been discussed in Sections 3.3 and 3.4, respectively, transformation was another important fate of PAHs in coking wastewater treatment processes.…”

Identification and removal of polycyclic aromatic hydrocarbons in wastewater treatment processes from coke production plants

“…Other PAH species such as Naph, BaA, Chr, and BaP also contributed a notable proportion. The PAH concentrations measured here were much higher than those measured in other countries (Walters and Luthy 1984) or in urban and urban/industrial wastewater (Pham and Proulx 1997;Fatone et al 2011;Manoli and Samara 2008). Considering the higher concentrations and variety of PAH derivatives identified here, these results indicated that coking wastewater was a clear source of PAHs.…”

“…These compounds are among the most carcinogenic, mutagenic, and toxic contaminants (Arfsten et al 1996;Petry et al 1996) and are classified among the socalled persistent organic pollutants, some of which are listed as U.S Environmental Protection Agency (US-EPA) and European Union (EU) priority pollutants. PAHs are ubiquitous in industrial and municipal wastewater (Dai et al 2007;Manoli and Samara 2008;Fatone et al 2011), as they can be generated from both natural processes and anthropogenic…”

Polycyclic aromatic hydrocarbons and polychlorinated biphenyls in sewage sludge from wastewater treatment plants of Kunming City

“…So they notably adsorb onto particulate after entering the treatment works. And then, theywill be removed during the primary and secondary sedimentation of the wastewaters and subsequently transferred to the sludge [5][6][7] .However, when sludge is used as fertilizer or disposed of in landfills, PAHs and PCBs will contaminate soil. Therefore, sludge should be monitored to prevent pollution [8] .…”