Turbulence condition low concentration sludge settlement rate measuring method and the measuring device

Abstract

A method and device for measuring the settling rate of low-concentration sludge under turbulent conditions. The sludge measurement data is obtained by processing sludge images. The image acquisition equipment is connected to a measurement computer through a data line. The measurement computer includes: an image acquisition module , an image processing module and an image measurement module, the image measurement module is used to perform calculations based on the data obtained by the image processing module to obtain the sedimentation rate of the measured sludge, which includes a sludge particle size measurement sub-module for processing according to the image The sludge image obtained by the module calculates the average particle size of the sludge image to calculate the actual average particle size of the measured sludge according to the conversion ratio; the sludge settling rate measurement sub-module is used to calculate the average particle size of the sludge according to the two frames obtained by the processing module The image is calculated to calculate the speed of sludge movement on the image, and the actual sludge sedimentation rate is calculated from the conversion ratio. The invention has the advantages of high measurement result precision, fast measurement, convenient use and automation.

Description

technical field [0001] The invention relates to a method and device for measuring the sedimentation rate of low-concentration sludge under turbulent conditions, in particular to a device and method for obtaining sludge measurement data by processing sludge images, which are used for various sludge sedimentation rates As well as shape and size testing, daily monitoring of sludge settling performance in sewage treatment plants, laboratory research on hydrodynamics of sludge settling process, and evaluation and early warning of local sludge deposition in various water treatment reactors. Background technique [0002] At present, sedimentation can be mainly divided into coagulation sedimentation, free sedimentation, flocculation sedimentation and regional sedimentation. Under static water conditions, the coagulation sedimentation test draws the relationship between turbidity and dosage, and calculates the velocity gradient G and GT during the slow stirring process of the water s...

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Problems solved by technology

Due to the fact that all kinds of settlements need to be studied by drawing settlement curves through experiments, and the settlement velocity can be obtained indirectly from the relevant parameters obtained, it is impossible to directly obtain the sludge shape, size and movement information during the settlement process, and the test process is complicated in actual application. , which reduces the test accuracy, and also wastes a lot of manpower and time; moreover, the research on the above-mentioned various types of sediments under dynamic water conditions has not yet formed a recognized test method, and the methods that have emerged are also based on various types of sedimentation under static water conditions. curve correction

[0003] In the production process, people use the image of the object to be obtained, and then process the image of the object to obtain the measurement data of the object, which can greatly improve the measurement efficiency, such as Chinese patent ZL02139916.6, that is, the size of the object is measured by the image method, however , the system is only suitable for measuring the size of macroscopic objects, and cannot measure small objects like sludge

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