Segmentation by type classifies sewage treatment enzymes into proteases, lipases, amylases, cellulases, and mixed‑enzyme formulations. Proteases, responsible for protein hydrolysis, capture the largest share—approximately 35 %—due to their effectiveness in breaking down organic nitrogen compounds and reducing biochemical oxygen demand (BOD). Lipases, accounting for 25 %, target fatty acids and greases, which are prevalent in food‑processing and dairy effluents. Amylases, with a 20 % share, facilitate starch degradation, crucial for breweries and starch‑based industries. Cellulases, representing 10 %, are applied where lignocellulosic waste is significant, such as paper mills. Mixed‑enzyme blends, comprising synergistic combinations, occupy the remaining 10 % and are increasingly adopted for complex waste streams that require simultaneous hydrolysis of multiple substrate classes. Each type’s market contribution aligns with the prevalence of specific contaminants in the corresponding application segment, underscoring the importance of tailored enzymatic solutions in optimizing treatment performance.