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Flocculation treatment control method for low-temperature and low-turbidity water on plateau in northwest region

A technology of low temperature and low turbidity water and control method, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of lack of applicability and poor flocculation effect of low temperature and low turbidity water in plateau, and achieve the improvement of flocculation effect and broad application prospects. Effect

Inactive Publication Date: 2013-06-26
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of lack of applicability and poor flocculation effect of the existing flocculation control method for low-temperature and low-turbidity water in the plateau in Northwest China, and to provide a control method for flocculation treatment of low-temperature and low-turbidity water in the plateau in Northwest China

Method used

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  • Flocculation treatment control method for low-temperature and low-turbidity water on plateau in northwest region

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specific Embodiment approach 1

[0011] Specific implementation mode one: In this implementation mode, the control method for flocculation treatment of low-temperature and low-turbidity water in the plateau in Northwest China is implemented according to the following steps:

[0012] 1. Add flocculants to the raw water and mix evenly, and the raw water with flocculants flows into the flocculation reaction tank to control the input of energy consumption per unit volume as h 1 =0.40~0.44J / L, shear strength F r1 =0.03~0.04, floc fractal dimension D f1 =1.45~1.58, get the first stage flocculation effluent;

[0013] 2. Control the energy consumption per unit volume of the first-stage flocculation effluent obtained in step 1 as h 2 =0.42~0.46J / L, shear strength F r2 =0.01~0.02, floc fractal dimension D f2 =1.60~1.72, and then flow out of the flocculation reaction tank to complete the control of flocculation treatment of low-temperature and low-turbidity water in the plateau in Northwest China;

[0014] The wate...

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that the flocculant added in step 1 is polyaluminum chloride. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Embodiment 3: This embodiment differs from Embodiment 2 in that in step 1, polyaluminum chloride is added to the raw water at 40-60 mg / L. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a flocculation treatment control method for low-temperature and low-turbidity water on a plateau in a northwest region, relates to a flocculation treatment control method and aims to solve the problem that the traditional flocculation control method is not suitable for the low-temperature and low-turbidity water on the plateau in the northwest region and is poor in flocculation effect. The flocculation treatment control method comprises the following steps of: firstly, adding a flocculant in raw water, uniformly mixing the flocculant and the raw water, and respectively controlling the energy consumption input, the shear strength and the flocculating constituent fractal dimension in unit volume to obtain first-stage flocculation outlet water; and secondly, respectively controlling the energy consumption input, the shear strength and the flocculating constituent fractal dimension in unit volume, and enabling the mixture to flow out of a reaction tank to finish the flocculation treatment control. A two-stage control way is adopted in the method, so that the flocculation effect of the low-temperature and low-turbidity water on the plateau in the northwest region is improved, and the water turbidity can be up to 0.5NTU after settlement. The flocculation treatment control method is mainly applied to the flocculation treatment of the low-temperature and low-turbidity water.

Description

technical field [0001] The invention relates to a control method of flocculation treatment. Background technique [0002] In the design and operation of traditional flocculation tanks, the hydraulic conditions of flocculation usually use G (velocity gradient) value and GT value as control indicators, and the average value of velocity gradient G in the flocculation stage is generally 20-70s -1 Between, the GT value is controlled at 1×10 4 ~1×10 5 within range. It can be seen that the control range of the traditional G and GT values ​​is relatively wide, which can often be satisfied, but loses the meaning of control to a certain extent. At the same time, the technology is derived based on the laminar flow state, while the actual water body is in the turbulent flow state, which makes the application limited. In this regard, many researchers have carried out in-depth research and improvement work on flocculation control indicators in recent years, and proposed many new flocc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 刘剑周敏周剑昊胡启超袁一星赫俊国
Owner HARBIN INST OF TECH