Application of Advanced Oxidation Processes for Polycyclic Aromatic Hydrocarbons Removal from Municipal Treatment Sludge


Karaca G., Tasdemir Y.

Clean - Soil, Air, Water, vol.43, no.2, pp.191-196, 2015 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 2
  • Publication Date: 2015
  • Doi Number: 10.1002/clen.201300395
  • Journal Name: Clean - Soil, Air, Water
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.191-196
  • Keywords: Evaporation, Fenton processes, Temperature effect, UV radiation, FENTONS REAGENT, SEWAGE-SLUDGE, WASTE-WATER, ORGANOCHLORINE PESTICIDES, CONTAMINATED SOILS, HYDROGEN-PEROXIDE, UV-LIGHT, PAHS, DEGRADATION, DISAPPEARANCE

Abstract

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.This study was carried out to investigate the removal of polycyclic aromatic hydrocarbons (PAHs) from municipal treatment sludge. The effects of temperature, sunlight, H2O2 and FeSO4·7H2O concentrations on the PAH removal were determined. A UV apparatus was designed for the PAH removal experiments. All experiments were conducted in triplicate. The highest ∑11 PAH removal ratio (71%) was obtained with 4.9M H2O2 addition to sludge (without FeSO4·7H2O addition) at 17°C. It was concluded that ferrous (Fe2+) and ferric (Fe3+) addition was unnecessary because ferrous and ferric contents of the sludge acted as catalysts. ∑11 PAH concentration was reduced 23% with acid cracking. PAH removal efficiency reached about 63% using the Fenton process. Sixty percent PAH was removed from the sludge with using sunlight in ambient air applications. PAH removal was hindered due to an increase in average temperature (17-36°C) during Fenton and Fenton-like processes. It was determined that 3-rings compounds were removed from sludge easier than the heavier compounds. It could also be seen that phenanthrene and anthracene (3-ring compounds) were removed from sludge with evaporation as 20 and 35%, respectively. It was concluded that the evaporation mechanism became more effective with increasing temperature. A special-designed UV apparatus was used in the PAH removal studies and effects of chemicals, temperature, and UV light were investigated. The evaporation mechanism became more effective in PAH removal with increasing temperature. The highest PAH removal ratio was obtained during H2O2 application. It was concluded that iron content in the sludge reacted with H2O2 and contributed to removal of PAHs during H2O2 application.