Improvement of the quality of sewage sludge compost by adding natural clinoptilolite

M. A. Stylianou, V. J. Inglezakis, K. G. Moustakas, M. D. Loizidou

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Zeolites are naturally occurring minerals characterized by high cation exchange and adsorption capacity and, thus, are used for metal uptake from sewage sludge subjected to composting process. In the present paper, changes in the physicochemical characteristics of sewage sludge samples after composting were recorded and analysed. The composting process was carried out for 120 days in pilot bioreactors, which were filled with 20% w/w clinoptilolite and sludge. The experimental results indicated differences in the metal content of the initial sludge and essential changes in pH, %Corg, % organic matter (OM), %N values and heavy metals content. Furthermore, the phytotoxicity tests that were performed showed that sludge samples affected seed germination and root elongation, but no phytotoxic effects were observed. According to the experimental results, it is concluded that the use of natural clinoptilolite leads to the improvement of the quality of the composted sewage sludge.

Original languageEnglish
Pages (from-to)240-249
Number of pages10
Issue number1-3
Early online date6 Feb 2008
Publication statusPublished - 15 Apr 2008


  • clinoptilolite
  • composting
  • heavy metals
  • sludge


Dive into the research topics of 'Improvement of the quality of sewage sludge compost by adding natural clinoptilolite'. Together they form a unique fingerprint.

Cite this