2003 AGN APR 01 I13 - Laserfiche WebLink

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CITY OF COLTON Item #13 AGENDA REPORT For the Colton Utility Authority Meeting of April 1, 2003 TO: HONORABLE CHAIRPERSON AND UTILITY AUTHORITY MEMBERS FROM: ERIC FRASER, DIRECTOR OF WATER AND WASTEWATER OPERATIONS G� SUBJECT: APPROVAL OF CONTRACT FOR INSTALLATION OF SYMBIO� TREATMENT PROCESS TO THE OXIDATION DITCH SYSTEM OPERATION AT THE WATER RECLAMATION FACILITY (WRF) IN AN AMOUNT NOT-TO- EXCEED $199,800 DATE: March 13, 2003 BACKGROUND Coiton WRF operates an Oxidation Ditch Biologicai Treatment Plant consisting of five ditches and five secondary clarifiers. The oxidation ditches have been designed for a maximum capacity of 1.0 mgd per ditch (total of 5 mgd) and are utilizing high-energy aerators (100 HP, each) to achieve the treatment performance. The WRF received a proposal from Enviroquip of Austin, TX to enhance the oxidation ditch system by adding the SymBio process control system. The proposed upgrade is expected to achieve significant savings in energy usage. It will also increase the hydraulic capacity of the oxidation ditch system. DISCUSSION/ANALYSIS The SymBio process offered by Enviroquip involves relatively small modifications to the oxidation ditch system which will promote simultaneous nitrification/denitrification in the oxidation ditch by operating the system at a reduced dissolved oxygen (DO) concentration. The biological process is monitored by an NADH probe, which adjusts the surface aeration power for maintaining optimum DO levels in the basin. Using this process technology is expected to achieve as high as 60% reduction in the energy requirements, which will amount to considerable cost savings. In addition, the SymBio process will increase system capacity by as much as 150°/a of the current capacity (for a total of up to 7.5 mgd). System re-rating will be determined during the initial operation of the SymBio system. Enviroquip is offering to integrate the SymBio process in Ditches No. 3 and No. 4. The installation package is inclusive of the SymBio probes, control panel and VFD's to control the motor speed of the surface aerators in each basin, as well as two ultrasonic flow measurement systems to measure the flow rate into each oxidation ditch. The SymBio system will have a PLC/SCADA system, which will permit remote access and could be integrated later with a main PLC system at the WRF. There are two plants operating in Southern California which were upgraded to SymBio and immediately achieved significant energy savings: (1) The Perris Valley Water Reclamation Plant (7.5 mgd) achieved 25.5% energy savings (approximately $170,000/yr) (2) The Big Bear Municipal Wastewater Plant (3 mgd) achieved 33°/a energy savings (approximately $100,000/yr). In addition, Big Bear saved $900,000 in capital improvements via the SymBio upgrade, by eliminating the need to add anoxic basins to the existing oxidation ditch system, which would be required for conventional denitrification. The SymBio process is a proprietary patented process that utilizes an NADH probe that scans the interior of the Biomass for presence of an enzyme that relates to oxygen content of the biomass. The existing technology