Upward-flow heterogeneous filter material filter tank

Abstract

The invention discloses an upward-flow heterogeneous filter material filter tank which comprises a filter tank body, the bottom of the filter tank body is divided into a water and gas distribution space at the bottom and a filter tank at the upper part through a partition plate, a plurality of long-handle filter heads are arranged on the partition plate to communicate the water and gas distribution space with the filter tank, the bottom of the filter tank is a supporting layer, and the upper part of the supporting layer is a filter material layer. A water outlet groove is formed above the filter material layer in the length direction of the filter tank, the tail of the water outlet groove is communicated with a water outlet channel in one side of the filter tank, a water inlet branch channel is formed in the other side, symmetrical to the water outlet channel, of the filter tank, a water inlet pipe is arranged at the bottom of the water inlet branch channel, and the outlet end of the water inlet pipe is communicated with the water and gas distribution space; and the filter material layer and the supporting layer are filled with a filter material which is a heterogeneous filter material, and the particle sizes of the heterogeneous filter materials are sequentially increased from top to bottom. The heterogeneous filter material is adopted in the filter tank, the obtaining cost of the filter material is low, arrangement with the small upper particle size and the large lower particle size can be naturally formed after backwashing, and the filtering efficiency of the filter tank can be better improved.

Description

technical field [0001] The invention relates to a water purification filter tank structure, in particular to an upward flow heterogeneous filter material filter tank. Background technique [0002] According to statistical data, the mainstream filter processes currently used in domestic water purification plants include air-water backwash homogeneous filter material filter (V-type filter), ordinary fast filter, flap valve filter, valveless filter, etc. , the water flow direction it adopts is downward flow, and its filter material is configured as homogeneous filter material or double-layer filter material, and corresponding provisions are made for its particle size uneven coefficient. The water treatment effect has been very good, especially the air-water backwashing homogeneous filter material filter, which is basically the mainstream process in large and medium-sized water plants. However, some unsolvable problems also appeared during the use of the above-mentioned types o...

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Problems solved by technology

[0003] 1. The direction of the filtered water flow does not match the particle size distribution of the filter material. When the filtered water first passes through the filter material with a small particle size and then passes through the filter material with a large particle size, the filtration performance of the filter material cannot be fully exerted, and impurities are easily formed on the surface of the filter material deposits, resulting in the need for frequent backwashing

[0004] 2. The V-shaped filter cannot be backwashed in a fully expanded state, and there is still a certain degree of sand running phenomenon. The backwashing effect is not good and the time-consuming and water-consuming is relatively large. The flap valve filter is allowed to have a large backwash Intensity, backwashing effect is better, but because of the way of draining using flap valve, there is uneven drainage, which is easy to cause uneven distribution of filter material, and then affect the filtering effect

[0005] 3. Negative water head phenomenon is easy to appear during downward flow filtration

[0006] 4. According to the current development situation, some developed cities have issued documents to improve the water quality of water supply, which have higher requirements for the turbidity of the water from the water purification plant, and the traditional treatment process will not be able to meet the demand

At present, the commonly used method is to increase the advanced treatment process, generally ozone + activated carbon filter, which is difficult to promote because of its high construction cost and operation cost.

[0007] 5. The purchase cost of traditional filter material is relatively high. As the number of backwashing increases, the filter material gradually appears graded, and regular sanding or sand replacement is required.

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