Where does the sludge go?

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Where does the sludge go?

• 50-100 grams per person per day
• Sludge handling/disposal accounts for 25-50 of
  the cost
• Sludge treatment-
• Convert organics to a stable form
• Remove liquid to reduce volume
• Destroy harmful organisms
• Produce useful byproducts
• soil

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Sewage Treatment in San Diego The
International Border

• San Diego System
• 2 million people
• over 550 square miles
• 190 million gallons a day

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Collection System

• 1. Over 2,800 miles of pipes collect sewage
• 2. 84 collection system pump stations
• 3. 6 major Metro pump stations
• 4. 28 miles of interceptor pipes
• 5. 15 connecting agencies (Cities and
  municipalities) that utilize the Metro system
  for sewage disposal
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Treatment System

• 1. Point Loma Treatment Plant (Advanced Primary
  treatment) 240 MGD Capacity.
• 2. North City Water Reclamation Plant, 30 MGD
• 3. South Bay Water Reclamation Plant, 15 MGD
• 4. San Pasqual Aqua Culture Plant, 1 MGD
• 5. Metro Biosolids Center. (Biosolids/Sludge
  processing)

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Point Loma Wastewater Treatment Plant
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SAN DIEGO AREA SEWERAGE HISTORY

• 1935 discharging nine million gallons of raw
  sewage through 22 outfalls. Nine of these empty
  into San Diego Bay.
• 1943 first primary treatment plant at 32nd
  Street and Harbor Drive with a capacity of 14
  million gallons a day (MGD).
• 1950 Original 32nd Street expanded to 40 MGD
  capacity. Pollution in San Diego Bay continues

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SAN DIEGO AREA SEWERAGE HISTORY

• 1960Water pollution in San Diego caused by
  sewage worst ever seen. Santee to the east is
  operating a state of the art reclamation plant.
• 1963 Metro system is put into operation. One
  primary treatment plant at Point Loma with a
  capacity of 88 MGD. Treated wastewater discharged
  3 miles offshore into the Pacific Ocean.
• 1972 Northern areas of the city (Sorrento
  Valley, Poway and Del Mar) connect into the
  Metro system Clean Water Act is passed
  requiring San Diego to covert to secondary
  treatment by 1975.

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SAN DIEGO AREA SEWERAGE HISTORY

• 1976 After studies for proposed secondary
  treatment and determining that primary treatment
  was effective, San Diego pursued a waiver for
  secondary treatment.
• 1984 Waiver application still in process. San
  Diego studies natural waste treatment and
  completes the Accelerated Projects which was
  an expansion and improvement of the wastewater
  system to compensate for increased growth. Otay
  Water District opens a new water reclamation
  plant.
• 1988 Subsequent lawsuits by the State and EPA.

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SAN DIEGO AREA SEWERAGE HISTORY

• 1995 Court battle concluded. San Diego
  receives a waiver for secondary treatment. Point
  Loma will continue to treat sewage at the
  advanced primary level. Treated effluent is
  discharged 5 miles offshore in 350 feet below
  the surface.
• 1998 Over 1 billion dollars in improvements to
  San Diegos system completed. North City
  Reclamation Plant and Metro Biosolids Center
  put into operation. Point Loma Treatment Plant
  capacity increased to 240 MGD.

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SAN DIEGO AREA SEWERAGE HISTORY

• 2002 South Bay Water Reclamation Plant put into
  operation. Canyon sewage spills plague city and
  secondary treatment waiver issue resurfaces
  causing concern.

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Tijuana River Watershed
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Tijuana River
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Imperial Beach
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Border Issues

• Sewage flow and pollution do not respect
  international borders

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Mesa/canyon topography
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Population Growth
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INTERNATIONAL WASTEWATER TREATMENT
PLANTINTERNATIONAL BOUNDARY AND WATER COMMISSION
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South Bay Water Reclamation Plant 2411 Dairy
Mart Road
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Financing the San Diego Plant

• U.S. federal government 239 million
• Mexico 16 million
• City of San Diego 88-140 million
  
• State of California 5.3 million

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