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

33

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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

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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

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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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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

1 2 3

On page 77 you can find an interesting film of CE 586 on DVD.

Department of Civil Engineering