Underdrain Systems Of Granular Media Filter
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QS-Type Nozziles For Underdrain Systems
The air-water backwash process for filter beds utilizes the thorough friction of expansion of the filter media layer and low-intensity water flushing, resulting in high media filter layer cleanliness and water savings. The selection of nozzles and the manufacture of nozzle floor are key to ensuring effective air-water backwashing.
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High-Precision Prefabricated Reinforced Concrete Nozzle Slabs
Nozzle slabs play a role in supporting the filter media layers and evenly distributing air and water in the underdrain system.
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In backwashing, especially in air-water backwashing processes, the key to uniform air and water distribution lies in the levelness of the nozzles, and its prerequisite is the levelness of the nozzle slabs.
ZCEN has developed an installation methodology using high-precision steel-mold reinforced concrete nozzle slabs with high-strength sealant-sealed jointing process, to overcome the drawbacks of poor levelness, poor air-tightness, and difficulty in vertically installing nozzles in conventional nozzle slabs. This technology has been widely adopted in new water plant installation and retrofitting and upgrading of existing water plants. -
U-Shaped Underdrain Tubes
The U-shaped underdrain tubes for water and air distribution are low-pressure resistant, featuring a unique dual-layer water and air distribution structure with upper and lower layers. It consists of horizontal water and air distribution pipes (U-shaped underdrain tubes), vertical water distribution pipes, and vertical air distribution pipes. This structural design ensures that the uniformity of water and air distribution in the shutter filters is superior to other types of low-resistance air-water distribution systems. The inner and outer surfaces of the horizontal U-shaped underdrain tubes are smooth and flat, with wall thicknesses that meet requirements and are uniformly distributed. They exhibit good straightness and possess sufficient stiffness. During the initial installation of filter media or when the filter bed is empty for maintenance, the horizontal U-shaped underdrain tubes can withstand the pressure generated by the filter media and support layers above without any deformation or damage.
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Flap Valve
The flap valve mainly consists of four components: cylinder, drive crank arm, flap frame, and flap plate. All components are manufactured from high‑strength stainless steel.
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S-Type HDPE Underdrain Blocks
Uniform and Stable | Flexible Configuration | Corrosion-Resistant
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Underdrain blocks are key components of sophisticated underdrain systems for filter beds. Zhongchang Company has invented a new type of high-density polyethylene underdrain block, which combines the advantages of Nozzles, nozzle slabs, triangular grooves, and double-layer underdrain blocks in terms of uniform water distribution and low head loss. It is suitable for underdrain systems in installation of new filter bed and upgrading and retrofitting of old filter beds. -
T-Type Underdrain Blocks for Deep Bed Filterin Water andWastewater Aplcatbion
Time - Saving | Labor - Saving | Non-Clogging
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As urbanization accelerates, urban wastewater discharge standards become more stringent and have been upgraded from Grade II to Grade I A in China. Both the upgrading and retrofitting of existing wastewater treatment plants and the construction of new plants with advanced treatment capabilities urgently require efficient, technologically advanced new products.
The denitrification deep bed filter is an integrated unit combining biological nitrogen removal and filtration functions. It uses specially designed large-particle-sized, thick-layer, homogeneous filter media as the biofilm support medium for denitrifying bacteria. Under conditions with added carbon sources, it functions as a denitrifying deep bed filter capable of removing total nitrogen (TN), suspended solids (SS), and total phosphorus (TP). Without added carbon sources, it operates as a deep bed filter, simultaneously removing SS and TP, thereby achieving multi-functional use and flexible operation.
