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Front filter back flushing device and method

A pre-filter and filter device technology, applied in the field of backwashing, can solve the problems of long backwashing time and complex backwashing filter structure, and achieve the effects of small size, improved water transparency and turbidity, and easy installation

Active Publication Date: 2018-04-27
ZHEJIANG YUTENG BAINUO ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complex structure and long backwashing time of the existing biochemical backwashing filter, a pre-filter backwashing device and method with good removal effect, strong practicability and high backwashing efficiency are proposed

Method used

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  • Front filter back flushing device and method
  • Front filter back flushing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The total length of a certain river is 15.74 kilometers, the width of the treated section of the river is about 15-20m, the depth of the river is 1.5-2.0m, and the flow rate of the section is about 0.14m 3 / s, the daily average flow is about 12000m 3 / d. The river course is polluted by the inferior V-class tributaries in the upper reaches, affected by the direct and mixed discharge of domestic sewage, service industry sewage, domestic sewage, etc., and ammonia nitrogen seriously exceeds the standard. The project uses a biochemical method to degrade ammonia nitrogen. Due to the large amount of sediment in the river, the filling in the equipment is blocked, which makes the equipment unable to operate normally.

[0075] According to the biochemical method, the influent flow rate of the equipment is 12000t / d, and a pre-filter backwashing device with a specification of 12000t / d is used.

[0076] Starting from the stable operation of the device of the present invention, a b...

Embodiment 2

[0086] A certain river course runs north-south, with a total length of 5.78 kilometers. The channel width of the treatment section is about 20m, the channel depth is 0.5-2.3m, and the flow rate of the section is about 0.05m3 / s. The main ammonia nitrogen index of the river is inferior V class. The project uses biochemical equipment to cut the river section. As the river was affected by rainy days, the amount of Nisha increased sharply, and there were algal blooms in summer. Affected by the above factors, biochemical equipment often has stuffing blockages and water leakage on the top of the equipment.

[0087] According to the biochemical method, the influent flow rate of the equipment is 1500t / d, and a pre-filter backwashing device with a specification of 1500t / d is used.

[0088] From the stable operation of the device of the present invention, a backwashing operation is carried out every 3 days, the air flushing intensity is 10L / (S.m2), the water flushing intensity is 4L / (S...

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Abstract

The invention discloses a front filter back flushing device and a front filter back flushing method. The front filter back flushing device comprises a cylinder body; the top part of the cylinder bodyis provided with a water inlet, the bottom part thereof is provided with a water outlet, and the middle part is provided with a back flushing water outlet; at least one group of filtering device is arranged in the cylinder body and located at the lower part of the back flushing water outlet; the filtering device comprises a first filter screen, a second filter screen, a third filter screen and a fourth filter screen which are arranged from top to bottom orderly; the filter screen parts of the first filter screen and the second filter screen are filter strips which are in parallel to each other, and the filter strips of the first filter screen and the second filter screen are staggered crossly and longitudinally under the filtering state and in parallel to each other under the back flushingstate; the filter screen parts of the third filter screen and the fourth filter screen are several concentric circles, and the concentric circles of the third filter screen and the fourth filter screen are staggered; the filter device further comprises an adjusting device for adjusting angle and height of corresponding filter screen under different states. The front filter back flushing device and method have the advantages of solving the problems of complex structure, long back flushing time, and others of the existing biochemical process back flushing filter.

Description

technical field [0001] The invention relates to the technical field of backwashing, in particular to a pre-filter backwashing device. Background technique [0002] On February 13, 2014, the executive meeting of the Ministry of Environmental Protection discussed and approved in principle the "Water Pollution Prevention and Control Action Plan", and launched a nationwide campaign to eradicate inferior V and eliminate black and odorous water bodies. At present, biochemical methods are widely used to reduce ammonia nitrogen and COD, and restore the self-purification ability of river courses. However, in practical applications, the leakage of sewage interception pipe network occurs frequently, leading to the direct discharge of domestic sewage into the river, seriously affecting the water quality of the water body, making most of the rivers appear milky white, with high SS content, which is easy to block the ectopic denitrification device , which will become the main source of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D29/03B01D29/58B01D29/68
CPCB01D29/03B01D29/58B01D29/688Y02W10/10
Inventor 厉炯慧冯华军项林
Owner ZHEJIANG YUTENG BAINUO ENVIRONMENTAL PROTECTION TECH CO LTD
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