Which type of treatment is primarily focused on the removal of larger solids?

Primary clarification is specifically designed to remove larger solids from wastewater. This initial treatment step is critical as it allows for the settling of heavier solids, which can include grit, sand, and other debris that can potentially damage downstream equipment or interfere with subsequent treatment processes. During primary clarification, wastewater is held in a settling tank where gravity helps separate solids from liquid. The settled solids, known as primary sludge, are often removed for further processing or disposal.

In contrast, aerobic treatment involves the use of microorganisms in the presence of oxygen to break down organic matter, while chemical treatment often employs additives to enhance solid removal or to precipitate pollutants. Secondary treatment is focused on the biological breakdown of organic matter and typically follows primary treatment, addressing finer suspended solids and dissolved organic substances. Thus, primary clarification stands out as the stage dedicated to addressing the removal of larger solids in the wastewater treatment process.