Purifax process

A schematic of the sludge chlorination process (Purifax process) is shown in Fig. 5. The sludge is first pumped through a macerator to reduce the particle size for optimum chlorine exposure. It is then mixed with conditioned sludge ahead of the recirculation pump at a ratio of 3.8 gal of recirculated sludge for each gallon of raw sludge. 

The staff requirements shown below apply to the Purifax process, macerator, pumps, and chlorination system. Dewatering or thickening operation and maintenance are not included. The labor requirements of a package chlorine treatment unit are listed below (a) Operation = 2 h/shift/unit and (b) maintenance = 3 h/shift/unit. 

US EPA, Evaluation of the Purifax Process for the Treatment of Septic Tank Sludges, US Enviromnental Protection Agency, Cincinnati, OH, 1975. 

The septage chlorination process equipment (Purifax) is commercially available over a wide range of flow capacities from 55 mVd (10 gpm) to a theoretically unlimited maximum. Sizing information is available from the manufacturer of Purifax. The system can be dimensioned such that the daily volume of septage is treated in 4-6 h. Most septage chlorination units are of a prefabricated, modular design, completely self-contained and skid-mounted. 

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