Investigation into the viability of a liquid-film three-phase spouted bed biofilter
✍ Scribed by Phillip C. Wright; Judy A. Raper
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1998
- Tongue
- English
- Weight
- 338 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0268-2575
No coin nor oath required. For personal study only.
✦ Synopsis
A variety of technologies exist for the treatment of malodorous air streams, including adsorption, absorption, catalytic combustion, bioÐltration and bioscrubbing. Conventional packed bed bioÐltration of malodorous substances from waste gas streams has the disadvantages of large unit surface area and relatively uncontrolled design principles. The large bed surface area leads to difficulties in maintaining even moisture and temperature proÐles. In addition, the control of such biologically important parameters as pH is difficult. Novel Ñuidized/spouted beds were studied for biological treatment of gases because of their high speciÐc gas Ñowrate and vigorous mixing which facilitates enhanced gasÈbiomass contact. Trials of a range of Ñuidized and spouted beds, with gas loadings of up to 14 000 m3-gas m~2-bed h~1, were carried out on various bioÐlm support media including glass ballotini, rice hulls, plastic discs and granules, silica gel, molecular sieves, vermiculite, perlite, activated carbon, cork, polystyrene and expanded clay. Severe aggregation and wall adhesion restricted the operational range of the reactors. Particle suitability was based on a combination of shape, density, size, porosity and wettability, with large, heavy clay particles performing best. Limited gas-phase bacterial studies on selected media with ammonia-and nitrite-oxidizing bacteria demonstrated the potential of Ñuidized/spouted beds for efficient bioÐltration of ammonia (20È40 mg dm~3).