WATER TREATMENT

Abstract

This document provides a method for disinfecting water comprising at least one microorganism and phosphorus present as inorganic phosphates and / or as organic phosphorus, the method comprising: (i) treating the water to reduce the phosphorus to a concentration of at least 0.7 mg; and (ii) contacting the water treated in (ii) with a quantity of percarboxylic acid to provide disinfection. This document also provides a method for disinfecting water comprising at least one microorganism and phosphorus present as inorganic phosphates and / or as organic phosphorus, the method comprising contacting the water with a quantity of percarboxylic acid to provide disinfection, wherein the quantity of percarboxylic acid is controlled based on the phosphorus concentration in the water and, optionally, also on the concentration of total suspended solids in the water.This document also provides an apparatus and system related to the methods, and the use of a phosphorus precipitating and / or coagulating agent to reduce the amount of a percarboxylic acid required to disinfect water comprising at least one microorganism.