Four inorganic packing materials (zeocarbon, porous celite, porous glass, zeolite) and a earthworm cast were compared with regard to the removal of ammonia in a biofilter inoculated with earthworm cast. Physical adsorption of ammonia on packing materials were negligible except zeocarbon (23.5 g-NH3/kg), and cell immobilization capacity have similar values irrespective of packing materials. Pressure drops of the packed bed were in order of earthworm cast ≧ zeocarbon ≧ zeolite ≧ porous glass ≃ porous. The maximum elimination capacity (g-N·kg--1·d-1) of ammonia, which were based on a unit volume of packing material, were in order of carbon (526) earthworm cast (220) ≧ porous celite (93) > zeolite (68) > porous glass (53). By using kinetic analysis, the maximum removal rates (Vm) and the saturation constant (Ks) for ammonia were determined, and zeocarbon showed superior performance among the five materials.
|Number of pages||6|
|Journal||Korean Journal of Applied Microbiology and Biotechnology|
|State||Published - 2002|
- Earthworm cast
- Inorganic packing materials