Small hydropower systems have emerged as an attractive solution for areas with low head and flow rates, offering versatility for implementation in diverse locations such as rivers and wastewater treatment plants. This research specifically focuses on exploring the potential of small hydropower generation within wastewater treatment plants. Through the utilization of computational fluid dynamics (CFD) analysis, the study successfully predicted the torque and power generation capacity of the installed turbine. The analysis underscored the effective control of fluid flow achieved through careful turbine design, including considerations of blade shape and quantity. For instance, in the case of the Tancheon wastewater treatment plant, the study revealed the ability to generate a torque of approximately 7000 Nm, translating to an estimated power production of around 48.3 kW per hour. Ultimately, this research significantly contributes to evaluating the feasibility and viability of small hydropower generation within wastewater treatment plants.