Ripple runner sand washing moving bed sand filter and water treatment process thereof

Abstract

The invention relates to a ripple runner sand washing moving bed sand filter and a water treatment process thereof. The ripple runner sand washing moving bed sand filter is characterized in that the upper part of the outer shell of the sand filter is cylindrical, the lower part is obconical, the lower part of the outer shell of the sand filter is provided with filter sand, the outer shell of the sand filter is internally provided with a water distribution assembly which comprises a water inlet pipe, a water distribution branch as well as a water inlet central vertical pipe and a water distribution ring pipe used for connecting the water inlet pipe and the water distribution branch pipe, the outer shell of the sand filter is internally provided with a sand lifting pipe and a ripple runner sand washer, the bottom of the outer shell of the sand filter is provided with an air tube, and the upper part of the outer shell of the sand filter is provided with a water outlet pipe and a sand washing drain pipe. The invention also comprises a water treatment process of the ripple runner sand washing moving bed sand filter. The ripple runner sand washing moving bed sand filter provided by the invention has reasonable design, a sand filter layer at the lower part is obconical, the filtering cross section is gradually increased when water passes through the filtering layer from down to up, and the filtering speed is gradually reduced, thus effluent quality can be improved while the total content of filter sand can be reduced, sand filter material can be cleaned in a circulating way, no-man management can be realized, and water resource can be saved to the utmost extent.

Description

technical field [0001] The invention relates to a kind of equipment suitable for urban water supply treatment and industrial water and circulating water treatment of metallurgy, chemical industry, machinery, power plant, etc., in particular to a corrugated channel sand washing moving bed sand filter and its water treatment process. Background technique [0002] At present, in the domestic water purification process, sand filter is one of the commonly used equipment. In traditional sand filter equipment, the raw water is filtered through the sand filter layer from top to bottom, and the dirt in the water is trapped in the sand layer, mainly concentrated on the surface of the sand filter material. As the dirt trapped on the surface of the sand filter layer increases, the filtration resistance gradually increases. When it reaches a certain level, it is necessary to stop the machine and perform air and water backwashing on the sand filter material. Start the next filtration cyc...

AI Technical Summary

Problems solved by technology

This form of filter has obvious and difficult to solve defects: 1. The work is not continuous. After a certain filtration period, it needs to be shut down to perform air and water backwashing on the sand filter material. When backwashing, it needs to consume a large amount of filtered clean water. Therefore, when using this type of sand filter, in the design of the water treatment system, it is necessary to consider the low water production due to shutdown of the filter during backwashing and the consumption of clean water during backwashing. The key point is to consider the compensation of these water volumes to ensure the water balance of the system. ; 2. The matching piping and valves of each filter are relatively complicated, and each backwashing of the filter must undergo complicated operations

These operations are very frequent and strict in the production process. If there is an operation error and the backwash water is too large, it will cause the sand filter material to run out. In serious cases, production must be stopped for maintenance; Screening effect, the smaller the particle size, the more the filter sand is distributed on the upper surface of the filter bed, so the dirt is mainly trapped on the surface of the sand filter material during the water filtration process

This situation will cause two problems. One is that the resistance of the filter layer increases rapidly during the filtration process of water, resulting in a rapid attenuation of the filtration capacity and shortening the filtration cycle.

The second is that the intercepted dirt is mainly concentrated on the surface of the sand filter layer, and it is difficult to fully flush each backwash, which will cause the surface layer of the sand filter material to agglomerate over time, and in severe cases, the water quality after filtration will deteriorate. Had to stop the machine to replace the filter material, which is a lot of work

Images