21 SPC-2025-0091A - Walnut Creek Wastewater Treatment Plant Enhancement and Expansion Project; District 1 Planning Commission Presentation — original pdf

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Investing in Austin’s Future Planning Commission April 22, 2025 Charles Celauro, PE Assistant Director, Austin Water Engineering & Technical Services Agenda 2 Balcones PP River Place PP Lost Creek PP Dessau PP OSCAR and CLARA Walnut Creek WWTP Hornsby Bend Biosolids Mngt Plant Thoroughbred Farms PP LEGEND Regional WWTP Solids Management Plant Package Plant (PP) Brushy Creek East WWTP Expansion 3 Wildhorse PP Taylor Lane PP South Austin Regional WWTP Pearce Lane PP Wastewater by the Numbers Austin Water Statics:  2,900 Miles of Gravity Lines  59,000 Manholes  137 Lift Stations  78 Miles of Force Mains  9 Decentralized Package WWTP  1 Jointly Owned Wastewater System Brushy Creek Wastewater System; COA Ownership is 9.87%  2 Regional Wastewater Treatment Plants Walnut Creek & South Austin Regional WWTP  1 Biosolids Plant Hornsby Bend Biosolids Management Plant Service Area Map 4 Walnut Creek WWTP South Austin Regional WWTP Plant History 5 Plant History WALNUT CREEK WWTP Rehabilitation and Renewal Projects 1977 – 18 MGD 6 Plant History WALNUT CREEK WWTP Rehabilitation and Renewal Projects 1977 – 18 MGD 1987 – 40 MGD 1990 – 60 MGD 1999 – Colorado River Outfall 2005 – 75 MGD 2019 – Optimization & Facility Plan 7 Plant History WALNUT CREEK WWTP Rehabilitation and Renewal Projects 2000 – Reclaimed Water 2005 – Headworks #2 2009 – Electrical Distribution 2013 – Reclaimed Water 2017 – Tertiary Filter 2019 – Secondary Treatment 2020 – Sludge Thickener 2020 – Pump Replacements 2021 – Plant Control & Network 2022 – Gas Scrubber 2025 – Primary and Flow 8 9 10 The treatment process for the existing plant and the expansion will be upgraded to reduce nutrient levels with a Biological Nutrient Removal (BNR) process, benefiting the health of the Colorado River downstream of Austin. 11 A flood wall will be built around the plant to protect it from floodwaters that could rise from nearby Walnut Creek. 12 Mitigate odors by incorporating advanced odor control technologies, such as biofilters, activated carbon filters, or basin covers. 13 Expansion to 100 MGD and Enhancement Renewal Projects • Headworks #1 renewal • Influent lift station Expansion Projects • New 25 MGD with nutrient removal Influent pipe • • Outfall pipe Treatment Conversion • 75 MGD with nutrient removal • UV disinfection Protection of Plant • Wet weather treatment facility • Flood wall 14 Treatment Process Basins Treatment Process Buildings Flood Protection Construction Packages GMP 1 GMP 2 GMP 3 GMP 4 HW 1 and ILS, Electrical I&C, Abatement Mobilization Site Services Long Lead Items and Early Works Floodwall & Site Drainage GMP 5 25MGD Expansion GMP 6 Wet Weather Facility GMP 7 Existing 75MGD Rehabilitation GMP 8 Outfall & Sitewide Civil 15 16 17 18 19 20 21 22 23