Renovation of waste water for direct reuse in an abattoir

Tertiary treatment methods were tested on secondary effluent from an abattoir biological waste-water treatment plant with the purpose of renovating it for reuse in the abattoir. The colour and dissolved organic matter could be removed to such an extent that the water would comply with water of ''insignificant health risk'' (Department of Health). The treatment process sequence proven to be effective in upgrading this water to ''insignificant health risk'' standard was coagulation with a polymer blend separation, ozonation, filtration and activated carbon filtration. The development of biologically activated carbon in practice was accepted as inevitable and desirable for optimum water quality, but not tested. A deciding factor in the selection of an appropriate treatment was that the final water would also have acceptable corrosion properties.