Marcab Co Inc

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60% of its original capacity after regeneration. Media can be regenerateed two to three times during its life of about 3 years. Several wastewater treatment plants have successfully used the iron sponge process, including the city of Santa Cruz, Calif., the Union (Calif.) Sanitary District Wastewater Treatment Plant, and the Central Marin (Calif.) Sanitation Agency. The Central Marin Sanitation Agency operates a 1300-L/s (30-mgd) peak wet weather facility in San Rafael. The plant uses two iron sponge scrubbing units in series. The vessels have been in operation for 8 years, and the spent media has been replaced three times. The cost of each replacement was approximately $15,000. One of the iron sponge units in operation is a primary unit; the second unit is a standby-polishing unit. The digester gas HS concentrations are reduced from approximately 400 ppm to 35 ppm. To regenerate the media, the vessel is taken out of service, filled with water again. On the second fililng, approximately 23 kg (50 lb) of sodium bicarbonate is added to kep the pH at approximately 8. Air bubbled through the media during regeneration. Close monitoring of temperature, pH, and air flow rate is required. The duration of regeneration of one vessel is 72 hours, and the regenerated media has 60% of its initial capacity. -Wendell Kido, Sacramento (Calif.) Regional Wastewater Treatment Plant; Ravi Krishnaiah and Tanya Yurovsky, Brown and Caldwell, Pleasant Hill, Calif.; and Perry Schafer, Brown and Caldwell, Sacramento (adapted from a paper presented at the California Water Environment Association April 1994 conference) To control emissions from a cogeneration facility that will use digester gas for fuel, the Sacramento Regional Wastewater Treatment Plant in Elk Grove, Calif., is incorporating iron sponge technology to reduce hydrogen sulfide (H

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