Additional studies on the use of cracking catalysts in conjunction with activated sludge wastewater treating
✍ Scribed by Robert D. Schwartz; C. J. McCoy
- Publisher
- Springer Netherlands
- Year
- 1976
- Tongue
- English
- Weight
- 271 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0049-6979
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✦ Synopsis
A previous study indicated that regenerated spent fluid catalytic cracking catalyst, added to a test activated sludge system, increased the sludge settling rate, decreased the settled sludge volume (compaction), decreased the supernatant (effluent) TOC and increased the supernatant optical clarity. In addition, phosphate levels were markedly reduced in a municipal sewerage e.ctivated sludge system.
As an extension of this study, fresh, spent, and regenerated cracking catalysts have been examined to determine if the observed activity could be attributed to the carbon and metals deposited on the catalyst during the cracking operation. To do this the earlier studies have been repeated and adsorption isotherm tests have been conducted with fresh, spent and regenerated catalysts.
The results indicate that: (1) the carbon and metals on the catalyst surface do not affect the improved settling and compaction of activated sludge observed when the cathlysi is present, nor do they affect TOC removals; (2) none of the catalysts tested adsorb soluble TOC to an appreciable extent; and (3) the presence of catalyst, by enhancing compaction, may stabilize the activated sludge system during wet weather conditions.