Nitrification using polyvinyl alcohol-immobilized nitrifying biofilm on an O2-enriching membrane
Tóm tắt
A combination of cell immobilization and membrane aeration approaches was used in a biological reactor to treat NH4
+ in wastewater. Nitrifying microorganisms, immobilized by polyvinyl-alcohol (PVA) and attached to the surface of a silicone membrane tube, were used to develop a novel reactor for nitrification. The immobilized biofilm had a rubber-like elasticity and resisted shear stress over 5 months of operation. The reactor removed 95% of ammonium, added at 1.97 g N m−2 d−1, with O−2 enriching the membrane.
Tài liệu tham khảo
Ahmed T, Semmens M (1992) Use of sealed end hollow fibers for bubbless membrane aeration: expermental studies. J. Membrane Sci. 69: 1-10.
Benfield LD, Randall CW (1980) Biological Process Design for Wastewater Treatment. New York: Prentice-Hall.
Brindle K, Stephenson T, Semmens MJ (1998) Nitrification and oxygen utilization in a membrane aeration bioreactor. J. Membrane Sci. 144: 197-209.
Chang CC, Tseng SK (1998) Immobilization of Alcaligenes eutrophus using PVA crosslinked with sodium nitrate. Biotechnol. Tech. 12: 865-868.
Chang YJ, Tseng SK (1999) A novel double-membrane system for simultaneous nitrification and denitrification in a single tank. Lett. Appl. Microbiol. 28: 453-456.
Chen KC, Lin YF (1994) Immobilization of microoganisms with phosphorylated polyvinyl alcohol (PVA) gel. Enzyme Microb. Technol. 16: 79-83.
Chen KC, Chen SJ, Houng JY (1996) Improvement of gas permeability of denitrifying PVA gel beds. Enzyme Microb. Technol. 18: 502-506.
Côté P, Bersillon JL, Huyard A, Faup G (1988) Bubble-free aeration using membranes: process analysis. J. Water Pollut. Control Fed. 60: 1986-1992.
Liu Y, Capdeville B (1994) Some observation on free ammonia inhibition to Nitrobacter in nitrifying biofilm reactor. Biotechnol. Lett. 16: 309-314.
Rothemund C, Camper A, Wilderer PA (1994) Biofilms growing on gas permeanle membrane. Water Sci. Tech. 29: 447-454.
Suzuki Y, Miyahara S, Takeishi K (1993) Oxygen supply method using gas-permeable film for wastewater treatment. Water Sci. Tech. 28: 243-250.
Timberlake DL, Strand SE, Williamson KJ (1988) Combined aerobic heterotrophic oxidation, nitrification and denitrfication in a permeable-suppout biofilm. Water Res. 22: 1513-1517.