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Pressure sand filter and reverse flushing method

A sand filter and pressure-type technology, applied in gravity filters, chemical instruments and methods, separation methods, etc., can solve the problem of low utilization rate of backwash pumps and backwash tanks, occupying space and position, and low utilization rate of backwash pumps To achieve the effect of reducing equipment investment and corresponding water treatment costs, reducing equipment and pipelines, and shortening the time of air washing and water washing

Inactive Publication Date: 2003-06-18
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The backwash pump 13 will only be turned on when backwashing, resulting in low utilization of the backwash pump
Therefore, the existing equipment has the disadvantages of occupying too much space and position, low utilization rate of backwash pump and backwash tank, high equipment cost, too long backwash time, low water utilization rate, complicated operation, etc.

Method used

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  • Pressure sand filter and reverse flushing method
  • Pressure sand filter and reverse flushing method
  • Pressure sand filter and reverse flushing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Existing equipment and method of operation

[0022] according to figure 1 For the equipment shown, after a certain period of filtration, the pressure head loss reaches 15KPA, and backwashing is required. When backwashing the filter material, first close the water outlet 9, open the exhaust port 7, and 200KPA compressed air enters from the air inlet 10 under the sand filter. After the sand layer is fully expanded, open the sewage outlet 8 and start the backwash pump 13. 10 liters / second. The flow backwashing of square meters, or air-water synchronous backwashing, takes 5 minutes.

Embodiment 2

[0023] After backwashing, close the backwash pump 13, close the backwash water inlet 11, let it stand for 1 minute naturally, then open the raw water pump 4, close the sewage outlet 8 and the exhaust port 7, open the water outlet 9, and filter normally. But first drain the filtrate for the first 5 minutes to ensure the quality of the effluent. Practical example 2: equipment and operation method of the present invention

[0024] Such as figure 2 As shown: the system is composed of a cylinder body 2, a water distribution device 3, a raw water pump 4, a water distribution cap 5, a water inlet 6, an exhaust port 7, and a sewage discharge port 8; the lower part of the pressure sand filter cylinder is provided with a set The air bag 18 of water chamber, air bag is to be made by butyl rubber material. There are two pipelines between the air pump 1 and the cylinder 2, one is set in the middle of the filter material of the filter layer, connected with the air washing inlet 10, and a...

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Abstract

A pressure sand filter is composed of cylindrical body, raw water pump and air pump. Said cylindrical body contains a lower air bag in water collecting chamber. The water collecting chamber also plays the role of back washing box and the blower plays the role of back washing pump. Its advantages are less water consumption, low cost and high water utilization rate.

Description

technical field [0001] The invention relates to a sand filter and an operation method, in particular to a pressure type sand filter and a backwashing method in a water treatment process. Background technique [0002] Sand filters are often used in general water treatment processes. When filtering, the water flows evenly through the filter layer through the water inlet device, and after being collected by the water collecting device, it flows into the clear water pool or directly into other water treatment equipment after the filter. When the filter runs until the turbidity of the effluent reaches a given value or the head loss reaches a predetermined value, the filter should be shut down and backwashed. [0003] Such as figure 1 In the pressure type sand filter shown in the prior art, the upper part of the cylinder body 2 is provided with a water inlet 6, an exhaust port 7 and a sewage outlet 8. The water distribution device 3 is connected to the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D24/24B01D24/46
Inventor 安逢龙曹军瑞刘艳辉尹建华阮国岭
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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