A compound flocculation sedimentation tank suitable for low turbidity water quality

A sedimentation tank and water quality technology, applied in the direction of flocculation/sedimentation water/sewage treatment, sedimentation tank, etc., can solve the problems of poor sedimentation effect, affecting effluent quality, uneven water distribution, etc., to improve the removal effect, improve the turbidity removal rate and The removal rate of organic matter and the effect of improving turbidity

Inactive Publication Date: 2011-11-30
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the survey, the inclined tube sedimentation tanks of some water plants are prone to problems such as uneven water distribution during operation
[0005] The surface water in some areas of our country, especially the reservoir water, shows the characteristics of low turbidity. The impurities in the low turbidity water are dissolved in the water in a fine colloidal dispersion system. Due to the low turbidity, the number of colloidal particles is small, and the particles collide and gather. Therefore, the formed flocs are fine, less and light, resulting in poor subsequent sedimentation effect, which in turn affects the quality of effluent water.

Method used

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  • A compound flocculation sedimentation tank suitable for low turbidity water quality
  • A compound flocculation sedimentation tank suitable for low turbidity water quality
  • A compound flocculation sedimentation tank suitable for low turbidity water quality

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Experimental program
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Effect test

Embodiment 1

[0045] Figure 1-Figure 5 Given is a basic type of flocculation sedimentation tank, the water flow direction is as follows figure 2As shown by the arrow, the water enters the lower part of the flocculation zone 3 from the water inlet hole 1 after being fully mixed with the drug, and flows from bottom to top. The purpose of the setting is to make the water flow into the inclined pipe 5 evenly. During the flow of the inclined pipe 5, the water impurities sink on the inclined pipe 5, and the water flows upward into the clear water area 6, and then flows into the water collection channel 7 from the sump 8. The water outlet pipe 13 enters the next processing unit.

Embodiment 2

[0047] Figure 6 Provided is an improved compound flocculation sedimentation tank. It is characterized by setting multi-stage flocculation in the pool, Figure 6 The middle is 3-stage flocculation, after the 1st and 2nd-stage flocculation, and before the 3rd-stage flocculation, an intermediate zone 16 is set. The purpose of setting the intermediate zone is that, due to the fast stirring speed of the agitator 2 in the first two stages of flocculation process, the formation of flocs is less, and the satisfactory turbidity removal effect may still not be achieved after sedimentation in the inclined tube 5, so the water in the first, After the second-stage flocculation, it is collected by the water collection channel 7 and then re-enters the third-stage flocculation through the middle area. Figure 6 The middle arrow shows the direction of water flow.

[0048] Whether the intermediate zone 16 is set or not, whether single-stage flocculation or multi-stage flocculation is used, ...

Embodiment 3

[0050] In the flocculation zone 3, flocs with a small volume density will be generated during the slow stirring process of the agitator 2, and these flocs will enter the sedimentation zone with the water flow upwards and deposit in the inclined tube 5. The shape of the flocs slides back into the flocculation zone 3; these larger flocs rotate with the agitator 2, and in this process absorb the newly formed smaller flocs; the bulk density of the flocs will further increase during the adsorption process. Large, finally sink down to the mud discharge area 10, and be discharged from the perforated mud discharge pipe 9. This process requires the stirring speed of the agitator to be slow enough.

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Abstract

The invention provides a compound flocculation sedimentation tank suitable for low turbidity water quality. Including the upper sedimentation area, the middle flocculation area and the lower mud discharge area; the sedimentation area is equipped with an inclined tube sedimentation layer, above the inclined tube sedimentation layer is a clear water area and a water collection device with a water outlet, and below the inclined tube sedimentation layer It is a water distribution area; the flocculation area is equipped with a horizontal shaft mechanical agitator driven by a motor, and the water inlet is set at the lower part of the flocculation area; the mud discharge area is equipped with a mud storage bucket and a perforated mud discharge pipe, and each agitator corresponds to a storage mud bucket. The invention can complete two processes of flocculation and sedimentation at the same time, and has broad prospects and application value especially for the treatment of low-turbidity raw water.

Description

technical field [0001] The invention relates to a water supply treatment device, in particular to a compound flocculation sedimentation tank. Background technique [0002] At present, domestic water supply plants usually use mixing, flocculation, sedimentation, filtration and disinfection to treat surface water sources. After the raw water is mixed with the coagulant, the flocs are formed through the flocculation equipment, and the flocs are separated from the water by gravity after passing through the sedimentation tank. [0003] Flocculation is one of the important steps in water treatment. Traditional flocculation tanks mainly include hydraulic flocculation tanks and mechanical flocculation tanks. The mechanical flocculation tank completes the flocculation process by agitating the water flow through the agitator paddle. Due to the adjustable speed, it has a strong ability to adapt to changes in water volume and a wide range of adaptation to G value. At the same time, ...

Claims

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Application Information

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IPC IPC(8): B01D21/02C02F1/52
Inventor 张振刘慧官涤王春丽孙勇米海蓉任芝军
Owner HARBIN ENG UNIV
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