Abstract
Abstract Ferrate and ozone are investigated for disinfection of three different wastewaters with an objective of achieving 70 to 2.2 MPN of total coliforms (100 ml)−1. These high level of disinfections are recommended for growing fish and food crops, for restricted recreational waters and for direct reuse. In secondary effluent the total coliforms can be reduced to 2.2 MPN (100 ml)−1 with a potassium ferrate dose of 15 mg l−1 and ozone consumption of 1 to 5.28 mg l−1, while in lime treated sewage and settled sewage the best levels of disinfection are 170 MPN and 551 MPN (100 ml)−1, in spite of increased ozone utilization of 36.6 and 41.3 mg l−1 respectively.
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