Agenda Item 7'6 Direct Reuse as a Water Management Strategy for Multiple WUGs

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Agenda Item 7.6 Direct Reuse as a Water
Management Strategy for Multiple WUGs

• October 20, 2004

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Todays Presentation

• Reuse defined
• How can reuse water be used?
• Who already has reuse projects?
• Water quality considerations
• Brazos G potential supply of reuse water
• Brazos G potential users of reuse water
• Putting supplies and demands together for the
  2006 Brazos G Regional Water Plan

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Definitions

• Water Reuse putting treated wastewater plant
  effluent to beneficial use
• Reuse Water
• Reclaimed Water
• Recycled Water

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Definitions

• Two forms of reuse
• Direct Reuse pipe treated wastewater directly
  from wastewater plant to place of use
• flange-to-flange
• purple pipe
• Indirect Reuse discharge treated wastewater to
  river, stream or lake for subsequent diversion
  downstream
• bed-and-banks

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Reuse Water Applications

• Irrigation
• Municipal (parks, golf courses, ball fields,
  landscape)
• Agricultural (avoid direct contact with food
  crops)
• Construction watering
• Industrial
• Power plant cooling
• Manufacturing process water
• Potable municipal water
• Requires advanced treatment (RO, etc.)
• El Paso Aquifer Storage and Recovery (ASR)
• Direct potable use not done yet in Texas

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Some Existing Reuse Projects

• City of Abilene
• City of Cleburne
• City of Round Rock
• City of Georgetown
• San Antonio Water System (SAWS)
• Lakeway, El Paso

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City of Abilene

• 4 MGD reclaimed water permit
• Excess stored in Lake Daniel
• Sales to customers for landscape irrigation
• Dyess AFB
• Abilene Christian University
• Hardin Simmons University
• Diamond Back Golf Course
• Others
• 0.45/1,000 gallons reclaimed water rate
• 2.75/1,000 gallons potable water rate

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Abilene Reclaimed Water System
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City of El Paso Reclaimed Water Project

• Started in late 1960s
• Over 5 MGD currently supplied
• Golf course irrigation
• Landscape irrigation
• El Paso Utilities
• Implementing plans that could double current
  uses
• Opportunity for Aquifer Storage and Recovery
  (ASR)

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Other Reuse Projects

• Cleburne
• ?1 MGD sales to Ponderosa Pines cogen plant
• Plans for golf course irrigation adjacent to WW
  plant
• Round Rock
• 1 MGD for irrigation (Forest Creek Golf Course)
• Plans for expansion (Old Settlers Park and
  others)
• Georgetown
• Berry Creek WWTP to Berry Creek Golf Course
• San Gabriel WWTP to Southwestern University

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Water Quality Considerations

• TCEQ Regulated by 30 TAC 210
• Type I Uses
• Public or food crops generally can come into
  contact
• Type II Uses
• Public or food crops cannot come into contact

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Quality Criteria 30 Day Average

• Type I Reclaimed Water Quality
• BOD5 or CBOD5 5 mg/l
• Turbidity 3 NTU
• Fecal Coliform 20 CFU/100ml
• Fecal Coliform (not to exceed) 75 CFU/100ml
• Type II Reclaimed Water Quality
• BOD5 20 mg/l
• Or CBOD5 15 mg/l
• Fecal Coliform 200 CFU/100ml
• Fecal Coliform (not to exceed) 800 CFU/100ml

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Brazos G Reuse Supplies/Demands

• 40 Wastewater treatment facilities in the Brazos
  G Region that are projected in 2060 to treat gt 1
  MGD (1,120 acft/yr)
• 26 of these wastewater facilities are proximate
  to water needs
• 30 Water User Groups (WUGs) with need are
  proximate to these wastewater facilities

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2060 Wastewater Quantity

• 2000 and 2060 treated wastewater quantity derived
  from Brazos WAM
• 2060 quantity of wastewater discharged either
• Total treated wastewater
• 25 reuse of Y2000 treated WW quantity
• 50 reuse of later treated WW quantity
• Wastewater discharged in 2060
• B) Estimate provided by facility

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Brazos G Potential Reuse Water
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2060 Discharge and County Balances
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2060 Water User Group (WUG) Balances
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Preliminary Reuse Pairings
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City of Bryan Example
This graphic is too large to place in pdf file,
sorry.
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Future Work

• Further develop reuse water supply options for
  interested water user groups (demand and supply)
• Confirm developed plan with water user groups
• Develop general costing scenarios for undefined
  future reuse water supply plans
• Upgrade cost for existing WWTP to Type 1
• Satellite wastewater treatment plant cost
• Planning costs for future use of reuse water for
  indirect potable municipal supply

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Discussion