Why is quicklime widely used in water treatment processes?

Quicklime is widely used in water treatment processes primarily because it is inexpensive and easy to handle. Its affordability makes it an attractive option for water treatment facilities, where managing costs is crucial. Additionally, quicklime can be easily transported and utilized in various applications, such as softening water and removing impurities.

In the context of water treatment, quicklime reacts with water to form calcium hydroxide, which helps in the coagulation process, assisting in the removal of suspended solids. Its ease of use enhances operational efficiency, allowing facilities to efficiently adjust pH levels and facilitate the flocculation process.

The other options, while they may contain elements that relate to water treatment, do not accurately describe the primary reasons for quicklime's popularity in this context. For instance, quicklime is not a disinfectant, does not have a very low pH (it actually contributes to increasing pH when dissolved), and is not considered non-reactive as it readily reacts with water and acids. Thus, the characteristics that make quicklime beneficial in water treatment processes predominantly revolve around its cost-effectiveness and handling convenience.