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Effluent

DO pH Sensor Sensor

FIG. 7.35.11 Schematic diagram of the Celgene biotreatment process. (Reprinted, with permission, from W. Gruber, 1993, Celgene's biotreatment technology: Destroying organic compounds with an in-line, on-site treatment system, EI Digest [November].)

DO pH Sensor Sensor

FIG. 7.35.11 Schematic diagram of the Celgene biotreatment process. (Reprinted, with permission, from W. Gruber, 1993, Celgene's biotreatment technology: Destroying organic compounds with an in-line, on-site treatment system, EI Digest [November].)

Caustic

Effluent plants with flows above 20,000 m3/day. At this size, the operating costs, including the present value of the facility discounted at 7% for 20 yr, is $4.15 million. These costs do not include sludge disposal; they are based on a BOD reduction of 90% from 200 to 20 ppm and a SS reduction from 140 to 30 ppm. The Haywood, California plant experienced operating problems similar to the Nassau County, New York plant. This plant was also shut down.

The OXITRON system design is now available from Envirex in Waukesha, Wisconsin. It has been particularly useful for denitrification in wastewater treatment in Reno, Nevada and in industrial wastewater treatment at a General Motors plant (Jeris and Owens 1975).

An interesting new application of aerobic, fluidized-bed, wastewater treatment is groundwater remediation. With continued recycling, this treatment can reduce effluent concentrations to levels below 5 ppm. The fluidized biomass acts like an organics equalization tank by adsorbing organics and gradually digesting them. No biomass washout occurs at low concentrations. This advantage is useful in the treatment of hazardous wastes, as described next.

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