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Genesee County Drain Commissioner Water and Waste Services Division

Genesee County Drain Commissioner Water and Waste Services Division. District #3 Linden WWTP Digester Improvements Project, Phase I Joe Goergen, GCDC - WWS Tom Grant, HRC. INTRODUCTION.

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Genesee County Drain Commissioner Water and Waste Services Division

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  1. Genesee County Drain Commissioner Water and Waste Services Division District #3 Linden WWTP Digester Improvements Project, Phase I Joe Goergen, GCDC - WWS Tom Grant, HRC

  2. INTRODUCTION • Hubbell, Roth and Clark is assisting the Genesee County Drain Commissioner with improvements to the digesters at the Linden WWTP. • The project includes: • Adding vortex mixing equipment to two anaerobic digesters • Sludge and gas piping improvements • Two new heat exchangers • Replacement of existing air actuated diaphragm pumps with new rotary lobe pumps.

  3. FUNDING AND COSTS • The approximate construction cost is $1.3 Million, which is being funded with an MDNRE SRF loan and 40% ARRA principal forgiveness. • Mr. Matt Raysin, P.E., Division Engineer and Mr. Joe Goergen, Division Superintendent is overseeing the construction for the County. • Also involved are Jeffrey Wright, Drain Commissioner, and John F. O’Brien, P.E., Director of Water and Waste Services. • Sorensen-Gross Construction Services is the General Contractor.

  4. DISTRICT #3, LINDEN WWTP • Plant was originally constructed in 1963 and provides influent pumping, primary settling, secondary treatment (activated sludge) and settling, and UV disinfection prior to discharge into the Shiawassee River. • Currently is rated for 11 MGD average flow and 16 MGD peak flow. • Solids handling facilities consist of anaerobic digesters for primary sludge, sludge thickening via dissolved air flotation (DAF) for secondary sludge, sludge storage vaults, and a loading station for hauling sludge off-site for land application and or landfill.

  5. BACKGROUND, PHASE I • Phase I Project Scope: • Digesters: • New vortex mixing • Sludge and gas piping improvements • Two new sludge-to-sludge heat exchangers • Sludge pump replacements • New instrumentation and controls

  6. BACKGROUND, PHASE II • Phase II Project Scope: • Under consideration for increased energy efficiency and utilization without adding maintenance demands

  7. DIGESTER MIXING • The existing Primary Digester No. 1 gas mixing equipment did not efficiently mix the digester contents. • The existing Primary Digester No. 2 was not equipped with any mixing. • The new vortex liquid mixing system improves the digesters’ operational efficiency, resulting in increased volatile solids destruction and gas generation. • The new system includes four jet nozzles and a1,500 gpm centrifugal chopper pump at each digester.

  8. VORTEX MIXING SYSTEM • System selected was the Vaughan “Rotamix” • Multiple fixed nozzles allow effective mixing energy distribution without the need for rotating equipment. • Can mix tanks after long periods of storage, and allows intermittent operation, reducing energy costs • Chopper pumps reduce clogging problems due to fibrous material and other debris • System operates without liquid level dependency • No scheduled nozzle maintenance required, and no rotating equipment within the process.

  9. VORTEX MIXING SYSTEM

  10. VORTEX MIXING SYSTEM

  11. MIXING PUMP (CHOPPER)

  12. TEMPERATURE MANAGEMENT • The solids pumped from the Primary Clarifiers to the Digester No. 1 caused heat loss and occasional upsets due to the temperature differential. • Two new spiral heat exchangers now pre-warm the solids for better efficiency. • Solids from Digester No. 1 pass through the heat exchanger as they are pumped to Digester No. 2 to warm the primary solids from the clarifiers. • A flow control valve is used to match the flow rates, keeping the level in Digester No. 1 tank constant.

  13. SPIRAL HEAT EXCHANGERS • Project included two Alfa-Laval Spiral Heat Exchangers, each 150 gpm • Utilizes a single channel that allows for fully counter-current flow. Channels are curved with uniform cross-section that causes a spiraling motion within the fluid. • The spiraling motion keeps the fluid fully turbulent, keeping solids in suspension and produces a “self-cleaning” action. • Side cover opens to expose entire surface. Images from Alfa-Laval

  14. HEAT EXCHANGERS

  15. PUMP REPLACEMENT • Existing air diaphragm and “plunger” pumps that were beyond useful life were replaced with rotary lobe pumps • Variable Frequency Drives (VFDs) were also added to some pumps to allow for more efficient operation

  16. PROJECT COORDINATION • Project required significant planning and support from Plant personnel to ensure the day-to-day operation would not be impacted by the construction.

  17. ADDITIONAL PHOTOS

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  22. Thank you!!! • Questions???

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