Brief introduction about Segovia

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Brief introduction about Segovia

• Segovia is a city in Spain, the capital of the
  province of Segovia in Castile-Leon. It is
  situated about an hour north of Madrid.
• It has over 55000 inhabitants and an extension of
  163'6 km².

Raul Cabrero Course WWTP 2006/07
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Brief introduction about Segovia

• The old city is spectacularly situated atop a
  long, narrow promontory. It contains a wealth of
  monuments, including the cathedral, a famous
  ancient Roman aqueduct, the Alcázar, and various
  churches built in the Romanesque style

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Brief introduction about Segovia
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WASTE WATER TREATMENT PLANT

• IN SEGOVIA
• (SPAIN)

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Pump control room

• From this room we control the speed of the screw
  pumps

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Variable speed pump motors
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Screw pumps

• - The screw pumps lift raw sewage approximately
  22 feet to a channel above the pumps.
• - From there the sewage can flow by gravity
  through the comminutor and remainder of the
  wastewater treatment plant.
• - The pumps are in operation 24 hours per day, 7
  days a week.

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Laboratory

• In the laboratory they analize samples of waste
  water.

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Aerated Grit Tank
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The grit tank removes heavy inorganic materials
such as sand, grit, egg shells, road pavement and
glass from sewage flows.The rolling action in
the tank is produced by diffused air introduced
at the bottom of the tank. Degritted sewage
overflows the tank's effluent weir and continues
on to the primary clarifiers' division box.
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Primary Clarifiers

• The primary clarifiers provide the facilities to
  remove the settleable and floatable solids from
  the wastewater.
• Effluent clarifier water passes over the effluent
  weirs and is directed to the rotating biological
  contactors.

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Scum Collection Box

• Flotable solids, such as grease and scum, rise to
  the top of the tanks.
• The scum and other floating materials is skimmed
  from the surface by the sludge scraping mechanism
  and is removed from the clarifiers to the scum
  collection box by means of a rotating pipe
  skimmer.

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Aerobic Digesters

• The four aerobic digesters stabilize primary and
  secondary sludge by oxidation to the point where
  it may be dewatered and thickened then
  transferred to the dewatering press.
• Sludge is mixed with air and microorganisms

• Digested sludge is drawn from the bottom of the
  tanks with the sludge pump in the dewatering
  room where sludge is concentrated on the belt
  filter press.

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Rotating Biological Contactors
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• Settled sewage from the primary clarifiers flows
  through an 18-inch cast iron pipe to the
  biosystem influent box.
• There it is split between 2 rows
• Each row consists of two shafts set parallel to
  the flow.

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Secondary Clarifiers

• The secondary clarifiers provide the necessary
  detention time and collection equipment to settle
  and remove the biological solids (sludge) from
  the bio-system mixed liquor.
• The clarified water passes over the effluent
  weirs and is directed to the final chlorine
  contact tanks.

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Sand filtration beds

• Slow sand filters are used in water purification
  for treating raw water to produce a potable
  product.
• They are typically 1 to 2 metres deep, can be
  rectangular or cylindrical in cross section and
  are used primarily to treat surface water.

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Chlorine Contact Tanks

• The chlorination system provide chlorine solution
  for the disinfection of plant effluent.
• There is a flow proportioning chlorine system for
  the chlorine to maintain a residual below the
  daily average of 0.55mg/L.

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Sodium Thiosulfate tanks

• Sodium Thiosulfate is used to neutralize the
  chlorine in the effluent following the
  disinfection process.

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Flow Metering System

• The depth varies with the flow rate and as the
  float moves a proportional signal is sent by the
  transmitter to a receiver mounted in the
  flow-indicating panel in the main control
  building.

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Polymer injection system

• To mix sludge with polymers in the belt press.

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Filter Belt Dewatering Press

• Sludge from the aerobic digesters is pumped to
  the dewatering press.
• There the sludge is mixed with polymers, spread
  out on a fabric belt, and increasingly compressed
  by a series of rollers.
• A conveyor belt then carries the dewatered sludge
  to a semi-tralier for ultimate disposal by means
  of being land applied on farm fields.

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Semi-trailer with sludge

• To transport the sludge to another place

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Output/cooling channel