JAUE2022-114: Formation of Disinfection Byproducts in the Pipe Networks

Abstract

The water quality indices of finished water in waterworks meet the standards formulated by the National Ministry of Health of China. However, water quality generally has a downward trend after long distance transportation and stay in the pipe network. In the drinking water distribution process, a series of complex biochemical reactions will occur within the drinking water distribution systems. High doses of residual chlorine are widely used to maintain the microbial stability in drinking water distribution systems. The formation of disinfection byproducts (DBPs) in the pipe network is a noticeable problem. Moreover. In addition to natural organic matter (NOM) in water, extracellular polymeric substances (EPS) secreted by microbial cells are also the precursors of DBPs. Metal corrosion is common in the pipe networks, and the corrosion products can affect the formation of DBPs. Based on the impact mechanisms, the corrosion products can be divided into two species: catalyzed and oxidative. The copper corrosion products can accelerate the DBPs formation by catalyzed action, and the lead corrosion products can promote the DBPs formation by oxidation effect.