Journal article
The influence of sewage and sludge treatment processes on concentrations of polycyclic aromatic hydrocarbons
Fresenius environmental bulletin, Vol.12(4), pp.338-342
01/01/2003
Abstract
The analysis of PAH concentration changes was carried out in samples of sewage flowing into an urban sewage-treatment plant in Czestochowa, Poland, after each stage of purification, and in samples of sludge obtained in each (unit process) of the treatment process. Average total concentration of PAHs analyzed in sewage was 5.2 mug/dm(3) in crude stage, 89.1 mug/dm(3) after the sand trap, 48.2 mug/dm(3) after the primary settling tank, and 7.8 mug/dm(3) after a secondary settling tank. Further, 4280 mug/dm(3) of dried sludge mass (d.s.m.) was observed in crude sludge, 12800 mug/dm(3) of d.s.m. after the separated sludge digestion chambers (SSDC), 6160 mug/dm(3) of d.s.m. after the open sludge digestion chamber (OSDC), and 259 mug/dm(3) of d.s.m. in dewatering sludge (pyrene only). Biological sewage treatment with secondary sedimentation decreased PAHs' concentration by 83%. Mostly such a decrease was the result of absorption of these compounds on particulates and their decomposition by microorganisms of activated sludge. Highest average total concentration of PAHs was found in the digested sludge, which may reflect the adsorption of PAHs onto particulate matter. After stabilization and filtration of sludge the PAHs content decreased, respectively, by ca 50% and 95%, which may be caused by volatilization, oxidation, and photooxidation processes of these compounds or their desorption to water from the sludge. This is consistent with the enhanced amount of PAHs in sewage after a sand trap.
Details
- Title: Subtitle
- The influence of sewage and sludge treatment processes on concentrations of polycyclic aromatic hydrocarbons
- Creators
- M Wlodarczyk-MakulaW W SulkowskiA PopendaL W Robertson
- Resource Type
- Journal article
- Publication Details
- Fresenius environmental bulletin, Vol.12(4), pp.338-342
- Publisher
- Parlar Scientific Publications (P S P)
- ISSN
- 1018-4619
- eISSN
- 1610-2304
- Number of pages
- 5
- Language
- English
- Date published
- 01/01/2003
- Academic Unit
- Occupational and Environmental Health
- Record Identifier
- 9984364412902771
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