One reason for choosing chloramines as a disinfectant is to?

Chloramines are chosen as a disinfectant primarily to reduce the formation of trihalomethanes (THMs), which are byproducts that can occur when chlorine reacts with organic matter in the water. When chloramines are used instead of free chlorine, they typically result in lower levels of THM formation because chloramines are more stable and have a reduced reactivity with organic substances in the water. This characteristic makes chloramines a more favorable option in systems where controlling DBPs (disinfection byproducts) is important for public health reasons and regulatory compliance.

The other options do not align with the advantages offered by chloramines. For instance, chloramines do not increase chlorine odor; they might actually produce a less strong chlorine smell than free chlorine. They are also not intended to lower water pH; in fact, using chloramines can actually result in a more stable pH level. Additionally, the use of chloramines does not primarily focus on enhancing color removal, which is typically controlled through coagulation and filtration processes rather than disinfection methods.