We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Capability of Ammonium Adsorption by Anaerobic Ammonia Oxidation Granular Sludge.
- Authors
Li, Yun; Li, Jun; Zhang, Yanzhuo; Wang, Xiujie; Zheng, Zhaoming
- Abstract
Nitrogen removal by anaerobic ammonia oxidation (anammox) of granular sludge is a globally important emerging technology. The ammonium adsorption properties of anammox granular sludge were studied at varying initial ammonium concentration and sludge concentration. Factors affecting the absorption process as temperature, pH, salinity, and metal cations were also examined. The experimental results indicated that ammonium adsorption by anammox granular sludge occurred quickly (in about 20 min). The optimal pH was 7.0 and the ammonium adsorption process was significantly affected by temperature, salinity, and metal cations. The experimental data were modeled using Langmuir, Freundlich, and Temkin adsorption isotherms and the ammonium adsorption process was fit to the Freundlich isotherm. The kinetic results indicated that the experimental data fit well to a pseudo-second-order model. Both intraparticle diffusion and boundary layer diffusion could affect the ammonium adsorption rate. The thermodynamic parameters ΔG, ΔH, and ΔS were evaluated and suggested that ammonium adsorption was spontaneous and exothermic. These findings indicate that the adsorption of ammonium should be incorporated into models for nitrogen removal, particularly for the use of anammox granular sludge.
- Subjects
AMMONIUM; ADSORPTION (Chemistry); OXIDATION of ammonia; SEWAGE sludge; LANGMUIR isotherms
- Publication
Water, Air & Soil Pollution, 2016, Vol 227, Issue 8, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-016-2965-1