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Wastewater Treatment

Wastewater Treatment. CVEN 451, Public Works Engineering Team Members: Kenneth Anton Roy Aviles & Elkin Mosquera. Wastewater Treatment. Objective: To provide sewage treatment for a subdivision development of 10,000 people. Assumptions

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Wastewater Treatment

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  1. Wastewater Treatment CVEN 451, Public Works Engineering Team Members: Kenneth Anton Roy Aviles & Elkin Mosquera

  2. Wastewater Treatment • Objective: To provide sewage treatment for a subdivision development of 10,000 people. • Assumptions • Four family members per house (2,500 units) • ¼ acre plot size (625 acres) • Wastewater generation is 100 GPD/CAP (1 MGPD) • Period of analysis is 30-years • Interest rate used is 7% • 67-year physical life of infrastructure

  3. Wastewater Treatment

  4. Wastewater Treatment • Option 1: New wastewater treatment plant (WWTP). • Capital investment includes land purchase, design, and construction cost

  5. Wastewater Treatment • Option 2: Expansion of Lick Creek WWTP. • Capital investment includes design and construction of expansion & O&M is a prorated cost

  6. Wastewater Treatment • Benefit of Option 1: A new wastewater treatment plant will support planed development in southern College Station. • Benefit of Option 2: Land zoned for another purpose will not need to be acquired and rezoned since existing plant will be used. • Recommendation: The recommended and lowest life-cycle cost (LCC) alternative is option 2, expansion of the Lick Creek Wastewater Treatment Plant. This option has an estimated Capital Investment cost of $16.3 M and LCC of $26.4 M.

  7. Action Items • Municipal bond rate – 7% 20-year rate • Option 1 Capital Investment - $22.8 M ($35.6 M NPV) • Option 2 Capital Investment - $16.3 M ($26.4 M NPV) • Sewage line cost *price of pipe from U.S. Plastic Corporation *price of installation costs from RS Means Manual ($11.00/ft/inch of pipe diameter)

  8. Action Items • Pipe sizes necessary for flow • Duration of new construction option is 2-years • From approval to end of construction

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