What are the main fillers for environmental protection water treatment and what role do they play?

1. Honeycomb packing: Hexagonal honeycomb packing has two types: inclined tube and straight tube, and the materials are high-strength and durable plastics made of polypropylene and polyvinyl chloride. Inclined pipe uses porous sedimentation to remove mud and sand at the inlet of water supply and drainage works, which has good treatment effects for general industrial and domestic water sedimentation, sewage sedimentation, oil separation and tailings concentration, and can also be used for filter reconstruction. It is characterized by large wet week, small hydraulic radius, good laminar flow state, and particle precipitation is not disturbed by floc flow. Straight pipes are used for microbial bodies in high-load biofilters, tower-type biofilters, submerged biofilters and biological turntables, and are used for biochemical treatment of urban sewage and industrial organic wastewater. It is characterized by small floor space, good treatment effect, low aeration intensity and no need for sludge backflow. 2. Filter head filter cap (backwashing filter head): The filter head is a steam-water backwashing device of the water distribution system at the bottom of the filter tank, which can effectively wash out the sludge impurities in the filter tank and ensure the normal operation of the water quality and quantity of the filter tank; The types of filter heads are mushroom (long and short handle), plum blossom type, tower type and cylindrical type, all made of ABS engineering plastics, with reasonable structure, firm connection, high bearing pressure and unchanged gap, which can make there be no dead water corner area between filter plates and no sludge accumulation, and the effect is good, and the (hourly displacement) is .25 ton, .5 ton and 1 ton. Long-handle filter head is often used in the water distribution system of filter steam-water backwashing; Short-handle filter head is used for single-water backwashing and filtering devices of water treatment equipment such as gravity filter tanks and pressure filter beds. 3. Multi-faceted hollow ball: The tower packing made of polypropylene plastic has a series of products such as multi-faceted hollow ball, step ring, Bauer ring, liquid surface cover ball, etc. It is suitable for decarbonization, degassing, decarbonization, oil-water separation, seawater desalination, pure water and wastewater treatment in power, chemical industry, paper making, environmental protection and other industries, and has the advantages of high flying speed, many blades, small resistance, large total wet specific surface area and high temperature resistance. 4. Semi-soft packing: Semi-soft packing is made of high molecular polymer, which has strong ability to distribute water and gas again. Long-term use does not deform, and it is easy to hang and release the film. The fallen biofilm is finely divided, and the filler is not easy to block. Resistant to corrosion and biodegradation. The diameter of the unit is generally ~ 12 and ~ 15, and the central rope has plastic rope and fiber rope. The specifications can be determined according to the requirements of the design department and users. V. combined packing: combined packing is another kind of filler improved on the basis of soft filler, which consists of fiber bundles, plastic rings, sleeves and central ropes. The fiber bundle is supported by the middle plastic ring sheet, which avoids the phenomenon of clustering in the center of the fiber bundle, and at the same time, it can play a good role in distributing water and gas, with good contact and mass transfer conditions and high oxygen utilization rate. The diameter of packing unit is:-￠12mm ￠15mm ￠2mm-2 mm VI. Stereoelastic packing: Stereoelastic packing is made of high-quality plastic packing with corrosion resistance, high temperature resistance and aging resistance. The product has long service life and good oxygenation performance. Due to the special structure of silk strips, the surface area of the film is doubled, and the film is easy to be attached and detached, and the biofilm activity is strong. High temperature load impact resistance, remarkable treatment effect, convenient operation and management, no blockage and no agglomeration. In different water quality engineering applications, the assembly form with adjustable wire thickness is completely suitable for anaerobic, facultative and aerobic treatment processes of various wastewater. >