Reverse filtering air water back flushing filtering pond and reverse filtering air water back flushing method

Abstract

A filter pool with reverse filter and air-water back flushing for water works is composed of a pool body with water-distributing channel on its bottom, air inlet tube with air distributing tubes in said channel, water draining dam with auxiliary valve, filtering dam with clean water overflow notch and chean water channel, the filtering material, and a folded-plate filtering plate fixed to pool bottom and with several back-flushing seams, water inlet holes, and pebble layer.

Description

technical field [0001] The invention relates to a water treatment filtration process and equipment, in particular to a reverse filtration air-water backwashing filter tank, a reverse filtration method using the water in the filter tank and a backwashing method in the filter tank body. Background technique [0002] Filtration is the main process of water treatment, and the filter tank is the most important treatment structure of the water plant. The filter is to remove the particulate suspended impurities in the water through the interception of the filter material in the pool. When the amount of impurities retained by the filter material reaches a certain level, that is, after reaching the saturated amount retained by the filter material, it is necessary to clean the filter material by backwashing, so that the filter material can be reapplied in the filtration process. The water consumption and power consumption are less, and the backwash effect of the filter is better. It ...

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Problems solved by technology

However, this type of filtration has a relatively high requirement for recoil strength, and backwashing with separate water cannot meet the requirements of backwashing, and the filter material is hardened and flushed not clean, and when the interception capacity of the filter layer reaches saturation, the water quality of the filtered water will deteriorate. , so in the past when separate water backwashing was used and the precision of the automatic control equipment was not enough, reverse filtration could not be realized, and it could only be used as a theoretical filtering form. In practical applications, the filtering form of water flow from top to bottom is adopted.

When using downward flow forward filtration, the water to be filtered first contacts the upper filter material with small gaps. When the upper filter material is blocked and the filter water head loss increases and needs to be recoiled, the dirt interception capacity of the lower filter material is much higher. Underutilized, resulting in a great waste of filter capacity

In order to achieve a better filtration effect and prolong the filtration cycle, a double-layer filter material was developed, which placed the light-weight and larger-grained filter material above the small-grained quartz sand filter layer, so as to simulate and realize the reverse filter as much as possible. Filtration conditions, but this setting will cause two kinds of filter materials to mix during backwashing, and the effect is still unsatisfactory

[0005] In addition, during the filtration process, there will be a small amount of sundries in the filter just after backwashing. The filtered water at this time is called "primary filtration water". The water quality of the primary filtration water is generally poor. Among them, the outlet water after filtration and the backwash drainage pipeline are set separately, so the discharge of the primary filtration water needs to set up another set of pipelines on the outlet pipe after filtration, which increases the construction cost and installation engineering volume of the filter tank

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