Table 5222 Cpi Applications Of Biofiltration

Company

Location

Application

S.C. Johnson & Son, Inc.

Racine, Wis.

Propane and butane removal from room air; 90% removal efficiency about 3000 cfm

Monsanto Chemical Co.

Springfield, Mass.

Ethanol and butyraldehyde removal from dryer air; 99%

removal, 28,000 cfm; styrene removal from production gases

Dow Chemical Co.

Midland, Mich.

Chemical process gases

Hoechst Celanese Corp.

Coventry, R.I.

Process gases

Sandoz

Basel, Switzerland

Chemical process gases

Esso of Canada

Sarnia, Ontario

Hydrocarbon vapors from fuel storage tanks (proposed)

Mobil Chemical Co.

Canandaigua, N.Y.

Pentane from polystyrene-foam molding (proposed)

Upjohn Co.

Kalamazoo, Mich.

Pharmaceutical production odors; 60,000 cfm (proposed)

Source: H. Bohn, 1992, Consider biofiltration for decominating gases, Chem. Eng. Prog. (April).

Source: H. Bohn, 1992, Consider biofiltration for decominating gases, Chem. Eng. Prog. (April).

within the last few years. Table 5.22.2 lists some chemical process industry CPI applications.

Biotrickling filters are more effective than biofilters for the treatment of readily biodegradable halogenated contaminants such as methylene chloride. Biofiltration can be unsuitable for highly halogenated compounds such as TCE, TCA, and carbon tetrachloride because they degrade slowly aerobically.

The limiting factors of soil-bed treatments are biodegradability of the waste and the permeability and chemistry of the soil. Because these factors vary, the design of soil beds is site-specific. For VIC removal, the lifetime of the bed depends on the soil's capacity to neutralize the acids produced. Any complex mixture with widely different chemical, physical, and biodegradive properties, such as petroleum hydrocarbon vapors, can require more than one optimized biofilter or biotrickling filter in series.

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