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Brief introduction about Segovia

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It is situated about an hour north of Madrid. ... the clarifiers to the scum collection box by means of a rotating pipe skimmer. ... – PowerPoint PPT presentation

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Title: Brief introduction about Segovia


1
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
2
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

3
Brief introduction about Segovia
4
WASTE WATER TREATMENT PLANT
  • IN SEGOVIA
  • (SPAIN)

5
Pump control room
  • From this room we control the speed of the screw
    pumps

6
Variable speed pump motors
7
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.

8
Laboratory
  • In the laboratory they analize samples of waste
    water.

9
Aerated Grit Tank
10
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.
11
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.

12
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.

13
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.

14
Rotating Biological Contactors
15
  • 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.

16
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.

17
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.

18
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.

19
Sodium Thiosulfate tanks
  • Sodium Thiosulfate is used to neutralize the
    chlorine in the effluent following the
    disinfection process.

20
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.

21
Polymer injection system
  • To mix sludge with polymers in the belt press.

22
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.

23
Semi-trailer with sludge
  • To transport the sludge to another place

24
Output/cooling channel
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