METHOD AND APPARATUS FOR BREAK-POINT CHLORINATION OF WASTE WATER

摘要

A method and apparatus for breakpoint chlorination is disclosed which utilizes a control dosing of chlorine as well as a base substance and sulfur dioxide to remove ammonia, disinfect and thereafter dechlorinate waste waters. The chlorine dosage is controlled according to a derivative of residual chlorine with respect to chlorine dosage to provide an accurate control of chlorine to insure oxidation of ammonia in the waste water.