CE 586 PRECIPITATION AND FLOCCULATION - GUNT · CE 586 PRECIPITATION AND FLOCCULATION 3 Uni t descr...
Transcript of CE 586 PRECIPITATION AND FLOCCULATION - GUNT · CE 586 PRECIPITATION AND FLOCCULATION 3 Uni t descr...
WATER TREATMENT PHYSICAL / CHEMICAL PROCESSES
63
THE INSTRUCTIONAL MATERIAL
INSTRUMENTATION AND CONTROL SWITCH CABINET
CONTINUOUS AND PRACTICAL PROCESS
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments. Materials delivered as paper printouts in a folder and additionally as PDF files on a CD.
Updates When any updates or additions to the CE 586 are made – in particular with regard to the instructional material – you, as a GUNT customer, will be notified accordingly.
Use of high quality instrumentation
Flow rate sensor
Conductivity sensor
Temperature sensor
Control of pH value in the precipitation tank
Controls of all primary components
Controls arranged very clearly
Digital displays for measured values
Digital controller for pH value
A large, clear process schematic on the switch cabinet makes it easy to assign all the components.
CE 586 PRECIPITATION AND FLOCCULATION
Precipitation tank Flocculation tank Lamella separator
Metering pumps
Precise addition of chemicals by use of industrial metering pumps
Instructional material of CE 586
1 2 3E N E R G Y & E N V I R O N M E N T
CE 586 PRECIPITATION AND FLOCCULATION
3 Unit description
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– Plug the supply unit connector into the con-
necting socket on the switch cabinet (item
56 in Fig. 3.11, Page 23).
• Connect the unit to the mains electricity supply.
• Make sure that the valves on the unit are
closed, except for valves V3 and V9.
Valve V3 is shown in Fig. 3.24. Valves V3 and
V4 are closed by turning the hand wheel clock-
wise. They are opened by turning the hand
wheel anticlockwise.
• Fill the raw water tank (B1) with water.
• Fill tanks B6, B7 and B8 with water.
• Set the main switch (item 57 in Fig. 3.11,
Page 23) to "1".
• Start the raw water pump (P1). If necessary,
add more water to the raw water tank (B1).
• Start pumps P2 to P4. If necessary, add more
water to tanks B6 to B8.
• Fill the trainer until treated water flows into the
treated water tank (B4).
• Start the sludge pump (P5).
• Continue operating the unit until the treated
water tank (B4) is full.
• Repair any leaks that occur.
• Stop pumps P1 to P5.
• Drain the entire unit.
• Remove the pH value sensors, observing the
instructions in Chapter 3.4.3, Page 28ff.
• Remove the conductivity sensors, observing
the instructions in Chapter 3.4.4, Page 31.
Fig. 3.22 Hose line for raw water, on
supply unit
Fig. 3.23 Hose line for raw water, on
trainer
Fig. 3.24 Valves V3 and V4V3
V4
material of CE 586
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E N E R G Y & E N V I R O N M E N T
CE 586 PRECIPITATION AND FLOCCULATION
3 Unit description
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3.3.3 Lamella separator
Suspension refers to a mixture of substances
made up of a liquid containing finely distributed
solids. After passing through the precipitation and floccu-
lation steps, the raw water has been converted
into a suspension. This suspension passes into
the lamella separator (11).Fig. 3.8 shows the layout of the lamella separa-
tor (11), Fig. 3.9 its function.The lamella separator (11) separates the sus-
pension into treated water and sludge. The
treated water flows freely through the outlet into
the treated water tank (26). The sludge contains
the solids formed. Separation occurs because of
sedimentation of the specific heavier solids.
Thus, the solids sink downwards in the lamella
separator. Therefore, the sludge extraction is
located at the bottom and the outlet at the top. The height of the outlet determines the level in the
lamella separator.The lamella separator contains individual
lamellae, which take the form of inclined panels.
They increase the effective sedimentation area.
The lamellae fill the entire width of the lamella
separator and are combined into a lamella bun-
dle. The flow in the lamella separator is deter-
mined by the lamella bundle.Fig. 3.10, Page 22 shows the lamella bundle. It
is designed to be removable. This allows the
lamella bundle to be cleaned at the end of the
experiment.
Fig. 3.8 Lamella separator (11), layout
Fig. 3.9 Lamella separator (11), function
Lamella bundleLamella
Sludge extraction
Inle
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Out
let
Sludge
Sus
pens
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Tre
ated
wat
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Precipitation and flocculation is a physical /chemi-cal process in water treatment. The removal of dissolved metals is one of the main applications of this process. It is often required for the production of drinking water and for treatment of contaminated ground water.
CE 586 enables this process to be teached very practically.
Practical Education in Water Treatmentphysical /chemi-The removal of applications of
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Water Treatment
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Precipitation of dissolved substances
Supply unitTrainer
Formation of flocs by coagulation and flocculation
A staff member of the British University in Egypt (Cairo) explains how CE 586 works.
Separation of the flocs by sedimentation
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On page 77 you can find an interesting film of CE 586 on DVD.
Department of Civil Engineering