Development for Evaluation System of Activated Sludge Condition Based on Image Processing

In sewage treatment, inspecting the activated sludge’s condition is essential to maintain purification performance. This paper presents a system for evaluating the activated sludge condition based on microorganisms and flocs from microscopic images of water samples from a reaction tank. First, the state of the floc is quantified by calculating the dispersion of the brightness at the boundary line and in the vicinity of the floc area. Then the activated sludge condition is evaluated based on the number of microorganisms and the state of the floc. As a result of the experiment, a notable trend is observed for each activated sludge with different conditions based on the state of the floc and the number of microorganisms.