Method and system for controlling coagulant filling rate by on-line measuring flocculate sedimentation speed

A technology of sedimentation speed and coagulant, which is applied in the control/regulation system, chemical variable control, non-electrical variable control, etc., can solve the problems of low cost, slow sedimentation speed, and can not reflect the lightening of flocs, etc. Direct detection, improved program design, stable online detection effect

Inactive Publication Date: 2006-01-04
SHANGHAI UNIV
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Problems solved by technology

However, when there are many organic matters in the raw water, this method cannot reflect the situation that the floc becomes lighter and the sedimentation speed becomes slower.
[0015] Each of the above methods has its own advantages and disadvantages and a certain scope of application, but it is far from perfect, so the research effect is better, the application scope is wider, the operation is more convenient, the cost is relatively low, and the measured parameters and control are relatively simple. way, there is still an urgent need

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  • Method and system for controlling coagulant filling rate by on-line measuring flocculate sedimentation speed
  • Method and system for controlling coagulant filling rate by on-line measuring flocculate sedimentation speed
  • Method and system for controlling coagulant filling rate by on-line measuring flocculate sedimentation speed

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Embodiment Construction

[0035] A preferred implementation of the present invention is described in detail as follows in conjunction with accompanying drawing:

[0036] The method of controlling the amount of coagulant injection by measuring the floc sedimentation speed online is introduced as follows.

[0037] 1. The raw water enters the mixing reaction tank, mixes, reacts, and flocculates with the added coagulant to produce flocs. In the method, the moving images of the flocs are collected in real time by a floc image acquisition sensor under water at the end of the mixing reaction tank.

[0038] 2. The sensor head contains a specially designed underwater water flow guide and deceleration mechanism, so that the water flow is slow, stable (flocs will not be broken), and horizontal (no vertical flow component) flows through the sampling window in the sensor head.

[0039] 3. The area of ​​the sampling window is about 30*20mm, and the thickness is 3mm, so as to avoid the overlapping of flocs in the pl...

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Abstract

The present invention relates to method and system for controlling coagulant filling rate by on-line measuring flocculate settling speed. The method includes the steps of: 1. acquiring flocculate moving image in the speed of 2 frames each second and calculating the position of flocculate; 2. calculating the flocculate settling speed based on the flocculate position change; and 3. comparing the detected flocculate settling speed with target value to determine the coagulant filling rate. The system of the present invention has flocculate image acquiring sensor with improved sensing head for fitting the measurement of flocculate settling speed. The present invention measures single parameter for the control of filling rate and the detection method is direct and effective.

Description

technical field [0001] The invention relates to a method and a system for realizing automatic control of coagulant injection by measuring the sedimentation velocity of flocculated fleece on-line. It belongs to the field of water supply engineering. Background technique [0002] Adding coagulant is currently the most commonly used method for liquid-solid separation in the water purification process. Whether the filling amount is appropriate is directly related to the factory water quality and production cost. The automatic control of filling volume is one of the key links in water treatment automation, and it is also an unsolved problem in current water treatment automation. [0003] Whether the amount of coagulant is appropriate in the water produced by the water plant is generally judged by whether the turbidity of the effluent from the sedimentation tank (hereinafter referred to as the sedimentation water) remains around a certain target value. The target value is deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52G05D21/00
Inventor 宋启敏陆明刚马伟亮宋晓峰
Owner SHANGHAI UNIV
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