FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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HEADWORKS REHABILITATION AT PLANT NO. 1, PROJECT NO. P1-105
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
Adopt Resolution No. OCSD 20-06 entitled, "A Resolution of the Board of Directors of the Orange County Sanitation District, making findings pursuant to Public Contract Code Section 3400 in support of the sole source specification of Huber Technology for grit washing and dewatering systems for Headworks Rehabilitation at Plant No. 1, Project No. P1-105".
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BACKGROUND
The headworks facilities are the first treatment process at a wastewater treatment plant and protect downstream equipment by removing large objects and abrasive materials. The current grit washing and classification systems are based on an older technology and have poor removal efficiency. Headworks Rehabilitation at Plant No. 1, Project No. P1-105, is a complete renovation of the existing headworks, including replacement of the grit washing and dewatering systems.
Abrasive materials, referred to as grit, are removed in grit basins, and conveyed to a grit washing and dewatering system to remove water and organic material. Removal of these abrasive materials is essential to improving the life of all down-stream mechanical equipment like sludge pumps, sludge thickening centrifuge systems, digester mixing systems, biosolids dewatering centrifuge systems and solids storage, and truckloading systems. In addition, these abrasive materials do not produce biogas in a digester. Rather, they tend to settle in the bottom of digesters which requires extensive digester cleaning on a five-year cycle.
There are two technologies typically used for washing and dewatering grit at large wastewater treatment plants: grit classifiers and a proprietary equivalent manufactured by Huber Technology referred to as COANDA units. Other technologies used for grit washing ...
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