Abstract
The use of raw cotton as carbon source in the denitrification of drinking water was tested in a field pilot-plant. The reactor treated water from a well in which the concentration of nitrate varied from 22 mg N l-1 in summer to a minimum of 9 mg l-1 in winter. The experimental reactor had a capacity of approximately 9 m3 and could be packed with up to 1500 kg of unprocessed cotton. The highest rate of denitrification observed was 0.36 kg N m-3 d-1, at a feed rate of 6 m3h-1. However, this performance could be sustained only temporarily as the relatively high water pressure caused serious compression of the bed. The long-term (six months) performance of the system was studied at feed rates of 0.8 and 1.5 m3h-1. The process was stable and 80-100% of the influent nitrogen was removed. The increase in DOC at the outlet was usually less than 7 mg l-1, and the number of bacteria was in the order of 105-106 CFU ml-1. Crossflow microfiltration was an effective post-treatment for the removal of bacteria and elimination of turbidity.
Original language | English |
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Pages (from-to) | 353-359 |
Number of pages | 7 |
Journal | Water Science and Technology |
Volume | 42 |
Issue number | 1-2 |
DOIs | |
State | Published - 1 Jan 2000 |
Event | Proceedings of the 7th International Conference of the Israel Society for Ecology and Environmental Quality Sciences - Jerusalem, Isr Duration: 13 Jun 1999 → 18 Jun 1999 |
Keywords
- Cellulose
- Cotton
- Denitrification
- Field pilot
- Microfiltration
- Water treatment
ASJC Scopus subject areas
- Environmental Engineering
- Water Science and Technology