Design of Breakpoint Chlorination Units

The design of breakpoint-chlorination follows the stoichiometric relations already presented in Sections 8.1 and 8.2. The amounts of chlorine, and other chemicals including acids and bases for pH-adjustment and sulfur dioxide for dechlorination, can be calculated from these relations.

The design of the adsorption unit is mainly based on empirical relations:

- A hydraulic application rate of s 0.1 ml m2 is recommended.

- 50 000 - 100 000 m3 waste water can be dechlorinated per m3 of activated carbon between two regenerations of activated carbon.

The spatial requirements are low due to the high rate of the chemical reactions involved in the breakpoint chlorination and the various dechlorination processes.

The TDS (total dissolved solid) increment as a result of break point chlorination can be found from the figures in Table 8.3.

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