Innovative Feedback Control System for Chemical Dosing to Control Treatment Plant Odors
Abstract:To control downstream odors while keeping the O&M costs to a minimum, Central Contra Costa Sanitary District (CCCSD) installed a unique control system, which delivers 50% hydrogen peroxide (H2O2) to the Headworks on an “as needed” basis. The system consists of a variable speed H2O2 pump and Hydrogen Sulfide (H2S) Continuous Emissions Monitoring System (CEMS). CCCSD purchased, tested, and tuned the control system to continuously adjust the 50% H2O2 injection rate based on the raw influent flow rate to the plant and the hydrogen sulfide (H2S) concentration in the foul air drawn off the surface of the primary effluent channel. This odor control system maintains the air born H2S concentration at the primary effluent channel in the range of .5 ppm to 1.2 ppm H2S while using an average of 250 gallons per day of 50% H2O2. Before the control system, the H2S concentration in the primary effluent channel would vary from 0.3 to 3.0 ppm. The design level of H2S for the primary effluent channel odor control scrubber is 1.0 ppm.
Document Type: Research Article
Publication date: January 1, 2000
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