Nitrogen removal by ion exchange: biological regeneration of clinoptilolite
A small-scale, pilot-plant study, in which a slurry of nitrifying bacteria in a 300 meq/l. salt solution was recirculated through a column of exhausted clinoptilolite that had been used to remove ammonium ion from a synthetic waste water, showed that the biological process provided reproducible column performance in short regeneration times (about two hours); the rate of biological regeneration was controlled by the rate of nitrification; the dissolved oxygen concentration had to be maintained above 6 mg/l. in the aeration tank by using pure oxygen; no significant fouling, zeolite capacity loss, or column deterioration of the clinoptilolite occurred over more than 40 exhaustion and biological regeneration cycles; column performance after chemical regeneration with 0.3 M NaCl was better than that after biological regeneration due to accumulated calcium and magnesium ions in the latter cycle; and humic acid and phenol in concentrations normally toxic to nitrifying bacteria did not affect the biological regeneration.
- Research Organization:
- University of Illinois, Urbana
- OSTI ID:
- 5212044
- Journal Information:
- J. - Water Pollut. Control Fed.; (United States), Vol. 49:12
- Country of Publication:
- United States
- Language:
- English
Similar Records
Use of Na clinoptilolite for concentrating silver and nickel ions from wastes
Lead removal and recovery from battery wastewaters by natural zeolite clinoptilolite
Related Subjects
42 ENGINEERING
CLINOPTILOLITE
BIOLOGICAL REGENERATION
NITROGEN
REMOVAL
WASTE WATER
PURIFICATION
AMMONIA
BACTERIA
DATA
FOULING
ION EXCHANGE
NITRIFICATION
OXYGEN
PILOT PLANTS
BIOLOGICAL RECOVERY
CHEMICAL REACTIONS
ELEMENTS
FUNCTIONAL MODELS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LIQUID WASTES
MATERIALS
MICROORGANISMS
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXYGEN COMPOUNDS
RECOVERY
SILICATE MINERALS
WASTES
WATER
ZEOLITES
550700* - Microbiology
420900 - Engineering- Waste Processing Plants & Equipment- (-1989)