Abstract
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 language | English |
|---|---|
| Pages (from-to) | 240-249 |
| Number of pages | 10 |
| Journal | Desalination |
| Volume | 224 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - Apr 15 2008 |
Keywords
- Clinoptilolite
- Composting
- Heavy metals
- Sludge
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)
- Water Science and Technology
- Mechanical Engineering