What type of waste is primarily targeted in the screening stage of sewage treatment?

In the screening stage of sewage treatment, the primary focus is on removing large solids and grit. This initial step is crucial as it helps protect the subsequent treatment processes by preventing clogs and damage to the equipment. During this stage, items like sticks, stones, and other large debris are filtered out from the sewage. The removal of these materials ensures that the treatment plant can operate more efficiently and effectively without interference from larger particles.

Other forms of waste, such as chemical waste, bacteria, microorganisms, and organic matter, are dealt with in later stages of sewage treatment. While these are important components of the waste that require treatment, they are not the primary concern during the screening process, which is specifically designed to address the bulkier, more tangible materials first.