JPS6412244A - Microorganism density detector - Google Patents

Abstract

PURPOSE:To detect density of microorganisms at a high accuracy with the shape and size unavoidably uncertain, by a method wherein a suspension of a microorganism reaction tank is photographed to recognize and identify a microorganism area and a non-microorganism area and the density of the microorganism is computed based on a projection area of the microorganisms being computed. CONSTITUTION:An inflow sewage 3 and a return sludge 4 are introduced to an aeration tank 1. A suspension camera 11 is immersed into the aeration tank 1 and a density image of the suspension 9 to be taken is converted into a digital signal to be stored into a density image memory means 20. A correction image obtained by a density brightness correction means 30 is applied to an image recognition means 40 to separate and recognize active pollution and a liquid phase part and the number of all pixels in an area where active sludge exists is computed by a characteristic value computing means 50 to be stored into a characteristic value memory means 80. Projection area of the active sludge stored in the means 80 is outputted into a sludge density computing means 100 by judgement with an image recognition/judgement means 90 and the density of the active sludge as computed is outputted and displayed. Thus, the density of the sludge with the shape and size being unavoidably uncertain can be detected at a high accuracy.