Aerobic thermophilic treatment of sewage sludge contaminated with 4- nonylphenol

Fawzi A. Banat, Stephan Prechtl, Franz Bischof

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33 Scopus citations


4-Nonylphenol (4-NP) occurs in sewage sludge as a result of the breakdown of detergents which contains nonylphenol ethoxylates (NPEs). 4-NP is of environmental concern because of its toxicity to biological systems. The present paper reports results of aerobic treatment under thermophilic conditions of sewage sludge artificially contaminated with 4-NP. Experiments were carried out using three parallel laboratory-scale batch reactors operating with blank, 50 and 100 mg/1 of 4-NP concentration. For the two studied concentrations up to 66% 4-NP reduction was achieved at a specific air flow rate of 16 l/(l.h) and a thermophilic temperature of 60°C, within 10 days of operation. The presence of 4-NP has minor effect on the rate of sludge oxidation and the nitrogen and phosphorous content in the sludge. (C) 2000 Elsevier Science Ltd.

Original languageBritish English
Pages (from-to)297-302
Number of pages6
Issue number3
StatePublished - Aug 2000


  • Aerobic
  • Biodegradation
  • Digestion
  • Nonylphenol
  • Sludge treatment
  • Thermophilic


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