Water distribution and gas distribution system and back washing technology thereof

Abstract

The invention discloses a water distribution and gas distribution system. The water distribution and gas distribution system comprises a water distribution plate, a plurality of filter caps and a plurality of gas distribution pipes, wherein primary water distribution holes are formed in the water distribution plate, grooves are formed in front walls, rear walls and cross walls of the filter caps, and axes of the grooves are located in the same straight line; primary gas distribution holes are formed in two side surfaces of each gas distribution pipe, and two ends of each gas distribution pipe are sealed; secondary gas distribution holes and secondary water distribution holes are formed in upper parts and lower parts of side walls of the filter caps respectively, the gas distribution pipes are inlaid in the filter caps in a matched manner through the grooves, a plurality of water distribution and gas distribution chambers are obtained, the filter caps are mounted on the water distribution plate, and the primary water distribution holes correspond to the water distribution and gas distribution chambers. With the arrangement of the multiple independent water distribution and gas distribution chambers and by means of design of triangular holes, sizes of gas holes and water holes are increased; side arrangement is adopted, so that filter material interception is guaranteed, blockage is effectively prevented, and uniformity of water distribution and gas distribution is guaranteed; besides, the parts are integrally formed, and therefore, mounting, fixation and maintenance are convenient.

Description

technical field [0001] The invention belongs to the technical field of water treatment engineering, and in particular relates to a water distribution and gas distribution system for backwashing of a denitrification filter tank and a backwashing process thereof. Background technique [0002] As the world pays more and more attention to water pollution, my country's environmental protection departments at all levels generally require sewage treatment plants to strictly implement the "Pollutant Discharge Labeling of Urban Sewage Treatment Plants" (GB18918-2002) Class A A standard. In the upgrading process of the completed sewage treatment plant, the most common and most difficult problem is the upgrading of TN. The existing process of the sewage treatment plant is difficult to meet the requirements of TN upgrading. craft. [0003] As a two-in-one treatment unit integrating biological denitrification and filtration functions, the denitrification filter is used in the filtration...

AI Technical Summary

Problems solved by technology

[0004] The traditional water distribution and air distribution filter bricks have the following disadvantages: (1) The volume of the filter bricks is relatively small, and it takes a lot of labor to install, and because of the large number, the gaps between different columns of filter bricks are uneven. It is easy to cause uneven horizontal gap due to difficult positioning, resulting in uneven water distribution and gas distribution in the whole pool; (2) Lack of fixing devices or buckle laps between filter bricks are not strong, easy to loosen during backwashing, and long-term use causes the water distribution device to overturn Destruction; or use mortar to fix, because the concrete mortar is not filled properly and immersed in water for a long time, and it is easy to loosen due to the huge momentum of backwashing, and it will fully cause the water and gas distribution device to overturn and damage for a long time; (3) The filter brick currently used It is generally in the form of plastic material or the plastic inner layer of the shell is filled with concrete. It adopts a small hole resistance water distribution and gas distribution system. The diameter of this small hole is between 0.2-1mm, and the pores are easily blocked or collapsed by sand, resulting in filter tanks. damaged or scrapped

This form of water distribution and gas distribution system has the following problems: (1) The gap between the filter plate and the filter plate and between the filter plate and the pool wall is sealed with cement

After working in the filter tank for several years, the filter plate fasteners and sealing cement are prone to loosening and falling off, which will affect the sealing effect of the filter plate and affect the uniformity of backwash water distribution and gas distribution; (2) The installation of the filter head The accuracy is difficult to control, and because of the uneven settlement of the filter plate after use, it is difficult to ensure the stability of the air cushion

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