Abstract
Impact of Aerobic Stabilization of Sewage Sludge on PAHs Concentration in Reject Waters
Highlights
IntroductionAs by-product of the wastewater treatment process, is formed during series of stages of the wastewater treatment
Sewage sludge, as by-product of the wastewater treatment process, is formed during series of stages of the wastewater treatment
Heavy metals are listed among inorganic compounds, whereas, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), active halogens adsorbed on activated carbon, expressed by the AOX index, organic halogen or polychlorinated dibenzodioxins or dibenzofurans (PCDD/PCDF) should be mentioned among organic ones (Fijałkowski et al, 2017, Haddaoui et al, 2016, Qu et l., 2019, Petersen et al, 2003)
Summary
As by-product of the wastewater treatment process, is formed during series of stages of the wastewater treatment. Municipal and industrial sewage sludge contains both organic and inorganic compounds classified as hardly degradable pollutants as well as toxic contaminants. Polycyclic aromatic hydrocarbons belong to the group of persistent organic pollutants (POPs) and their presence in sewage sludge has been confirmed both in literature sources and former studies of co-authors (Fijałkowski et al, 2017, Haddaoui et al, 2016, Qu et al, 2019, Petersen et al, 2003, Zennegg et al, 2013, Liu et al, 2013, Wlodarczyk-Makuła et al, 2015). It should be highlighted that in most studies the PAHs content in reject water is omitted; the previous co-authors’ research considered the presence of polyaromatic hydrocarbons in reject water This problem is of high importance because the reject water coming from sewage sludge treatment is disposed together with raw wastewater into the technological wastewater treatment process.
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