Ammonia Removal Kinetics of Nitrifying Biofilter after Long Term Usability

Main Article Content

วิบูลย์ลักษณ์ พึ่งรัศมี
ฐานวัฒน์ กาญจนกุล
เพ็ญพิชา สท้านวัตร
สรวิศ เผ่าทองศุข

Abstract

This research aimed to study the ammonia removal kinetics of nitrifying biofilter after long term usability for 3 months and 6 months. The biofilter media was porous plastic BCN-012. The kinetics parameters i.e. maximum ammonia removal rate (Vmax) and the ammonium concentration at half of the maximum ammonia removal rate (Ks) were evaluated using Monod equation and could be applied for water treatment design and calculation. The biofilter was incubated in two of 100 L plastic tanks containing ammonia concentration as 5 mg-TAN/L. The first tank was using for 3 months and another tank was for 6 months. Thereafter, 0.5 L of biofilter samples were taken out for measuring ammonia removal rate in 2 L bioreactor under batch condition. The initial ammonia concentrations in the test reactors were 1, 2, 5, 10, 20, 30 and 45 mg-TAN/L with pH and alkalinity of 7.5-8.5 and 100-150 mg/L as CaCO3, respectively. Oxygen was provided by aeration through air stone. The results showed that biofilter acclimated for 3 months had higher ammonia removal rate of 85.62 mg TAN/m2/day and half saturation constant was 11.47 mg TAN/L while the 6 month acclimated biofilter had 65.08 mg TAN/m2/day with half saturation constant of 5.55 mg TAN/L.

Downloads

Download data is not yet available.

Article Details

Section
Research Articles

References

[1] Tanthunwes, M. and Phornprapha, P. 1995. Water Quality Management and Waste Water Treatment for Pond Fish Culture. 2nd ed. Bangkok : Chulalongkorn University Press. (in Thai)

[2] Anthonisen, A.C., Loehr, R.C., Prakasam, T.B.S. and Srinath. E.G. 1976. Inhibition of nitrification by ammonia and nitrous acid. J. Water Pollut. Con. F. 48(5): 835-852.

[3] Nootong, K. 2006. Performance and kinetic evaluations of a novel bioreactor system in the low-oxygen/low-fluid shear reaction environments. Doctoral dissertation, University of Pennsylvania.

[4] Fenchel, T. and Blackburn, T.H. 1979. Bacteria and Mineral cycling. London: Academic press.

[5] APHA, AWWA and WEF. 2005. Standard Methods for the Examination of Water and Wastewater. 21st ed. American Public Health Association, Washington DC.

[6] Monod, Jacques. 1949. The Growth of Bacterial Cultures. Annual Review in Microbiology, 3: 371-394.

[7] Monwikarn Kajohnboon. 2008. Bacterial seed applied as biofilter in the recirculation water of closed-system shrimp pond. Master’s Thesis, Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University. (in Thai)