Design of Chlorination Unit Operations Facilities

Important parameters to be considered in the design of chlorination unit operations facilities should include chlorine feeders, dosage control, chlorine injection and initial mixing, contact time and chlorine dosage, and maintenance of self-cleaning velocities through the chlorine contact tank. Each of these will be discussed in succession.

Chlorine feeders. Chlorine feeders may be categorized as feeders for chlorine gas and feeders for hypochlorite solutions. Schematics of chlorine gas feeder systems are shown in Figures 17.5, 17.6, and 17.7, as well as a drawing of a hypochlorite feeder is shown in Figure 17.8. Hypochlorite feeders are also called hypochlorinators.

Figure 17.5 is a chlorine gas feeder system that utilizes an evaporator. Evaporation of liquid chlorine speeds up the dosing delivery process. When dosage rates exceed 680 kg/d, evaporators must be used. Lower dosage rates may also require the use of evaporators when space is limited.

Expansion sion tank

To diffuser

S Insect vent j screens (typical)

12.5-mm ■chlorine Balancing gas vent valves

Power supply

To diffuser

S Insect vent j screens (typical)

12.5-mm ■chlorine Balancing gas vent valves

Injector water supply

Power supply

Chlorine leak detector

Chlorine leak detector

Injector water supply

Diaphragm type gage protector Sample tubes^ (typical)

25-mm liquid chlorine

Manifold valve

Vent

-Overflow Cylinder valve

To floor drain (typical)

Scale

Low liquid chlorine pressure switch

Rupture disk ft

Rupture disk

Diaphragm type gage protector Sample tubes^ (typical)

25-mm liquid chlorine

Manifold valve

Flex connector Auxiliary container valve

Scale

Flex connector Auxiliary container valve

Chlorine tonne containers

FIGURE 17.5 Schematic of chlorine feeder system using evaporators and tonne or larger containers.

To diffusers t

25-mm

Chlorine vent

Insect vent\ screens (typical)

Chlorine solution

12.5-mm, vent 25-mm Chlorine vent jL

12.5-mm

Chlorine"-pressure reducer valve

Power * supply

Chlorine solution

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