Full-scale scrubber sludge characterization studies. Final report

Technical Report · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6570826

Crowe, J L; Seale, S K

Chemical, physical, and instrumental characterization studies were performed on 97 samples of sludge and dried solids obtained from five full-scale wet lime--or limestone--SO/sub 2/ scrubbing systems to provide a data base containing detailed and representative chemical and physical property data from flue gas desulfurization sludges and, where possible, to relate the sludge physical property data to either chemical composition, solids component morphology, or plant operating conditions. Under normal (reducing) conditions, the solids component of scrubbing slurries consisted predominantly of calcium sulfite hemihydrate and flyash. The sulfite was present as single plate crystals where limestone was used as the absorbent and as complex spheroidal aggregates where lime was used. Under oxidizing conditions large, blocky crystals of gypsum were precipitated as the predominant Ca--S compound. Slurry properties, such as settling rate and settled bulk density, were dependent on this morphology; the larger, less complex forms achieved a higher settled bulk density, and within the same range of slurry solids content, gypsum slurries settled up to 10 times as fast as comparable plate- or aggregate-containing slurries. Over the full range of samples studied, settling rate was shown to be inversely proportional to slurry solids content, and a positive correlation was seen between final bulk density and final solids content. Flyash content was shown to increase the settled bulk density. It was also shown that SO/sub 2/ scrubbing sludges may be stabilized with various additives; a mixture of sludge containing 10% CaS--CaO (in a 1:1 ratio) achieved 480 lb/in./sup 2/ compressive strength after 11 days at room temperature and 100% humidity.

• Research Organization: Tennessee Valley Authority, Muscle Shoals, AL (USA); Tennessee Valley Authority, Chattanooga (USA)
• OSTI ID: 6570826
• Report Number(s): EPRI-FP-942
• Country of Publication: United States
• Language: English

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