Multi-media filter Multi-media filter uses quartz sand and anthracite to remove suspended solids in raw water, which belongs to common rapid filtration equipment. As this demineralized water system will carry a small amount of oil passing through the customer's water equipment in the circulation process, the unique pores of the filter materials in the multi-media filter can effectively intercept it, which will be removed by the drainage pipeline in the backwashing process. Experience has proved that the removal rate of water-insoluble particles, grease and suspended solids by multi-media is as high as 95%. It can effectively remove colloid, oil, suspended matter, etc. in raw water. -It has a unique uniform water distribution mode, which can achieve the best filtration effect and meet the SDI requirements of the follow-up equipment for a long time. -the filter runs for a long time. -The water distribution device at the bottom of the filter adopts perforated plate+water cap. 1) this system is equipped with six φ 3000 multi-media filters, with filter layer height of 1200mm, filtration speed of 9.9m/h and single set of treatment capacity of 70m3/h .. Technical parameters: working pressure: < 0.6MPa, working temperature: 5-50℃, water backwashing strength: 10L/m2.s, gas scrubbing strength: 10-15L/m2.s, packing height: refined quartz sand 1200mm, quartz sand specification: 0.5-8mm, structural form: the equipment consists of main body, water distribution device, water collection device, external piping and instrument sampling device, etc. The water inlet device is upper water inlet and horn water distribution, and the water collecting device is perforated plate+water filter cap; The external piping of the equipment body is equipped with valves, pressure gauges and sampling interfaces, which is convenient for users to realize the normal operation of the equipment on site. Continuous operation time: the design operation time of the system is 12-24 hours, and then the mechanical filter is backwashed; According to different seasons and changes of water quality, the backwashing cycle is adjusted to ensure that the turbidity of effluent is less than 1 NTU. Backwashing flow rate: the purpose of backwashing is to loosen quartz sand and anthracite in reverse direction, and wash away the interception on the filter layer, so as to clean the filter layer. Generally, the backwashing intensity is controlled at about 10L/m2.s. Backwashing time: the length of backwashing time is related to the interception amount of the packing layer. The backwashing time can be determined according to the turbidity of backwashing drainage. Under normal circumstances, the turbidity of backwashing is less than 1NTU, and the time is about 15 minutes, which can be appropriately adjusted according to the operation conditions. Positive washing flow: the positive washing flow can be about 70m3/h/ set. Positive washing time: the turbidity of positive washing water is 1 NTU, and it usually takes about 10 minutes. Technical requirements: 1) The multi-media filter is a cylindrical container welded by steel, the material of the equipment body is carbon steel, the main weld seam is submerged arc automatic welding, and the design and manufacture meet the standards; 2) The inner wall of the multi-media filter is lined with rubber for anticorrosion, and the lining is vulcanized by a vulcanizing kettle, and the bulk vulcanization process is rejected. Rubber lining thickness is not less than 3mm. All rubber linings are complete without any leakage points, and have been tested by 20kv EDM. 3) Hydrostatic test shall be carried out before rubber lining of the multi-media filter. The rubber lining of the inner wall of the equipment is complete without pinholes and any leakage points, and can accept 15kv～20kv electric spark test without breakdown. The rubber lining layer extends to the joint surface of the external nozzle flange. Rubber lining equipment is vulcanized integrally in vulcanization tank, and reclaimed rubber is not used; 4) Two manholes are set on the multi-media filter body, which ensure the access of maintenance personnel and replacement parts. The inner surface of manhole and manhole cover is flush with the inner surface of container. Manholes are equipped with manhole covers, washers, bolts, nuts and lifting rods; 5) The multi-media filter is provided with two sight glasses, the material of which is transparent and corrosion resistant, the thickness of which can bear the design pressure of the container and the test pressure during the test, and the inner surface of the sight glasses is flush with the inner surface of the container; 6) The water distribution and water collection devices inside the multi-media filter can ensure uniform water flow in the whole filter layer and prevent partial flow deviation. The water outlet device can not only uniformly collect water, but also uniformly distribute backwashing water flow through the bed layer, and the backwashing drainage device can meet the design requirements of maximum backwashing water volume. The water and gas distribution of water inlet, air inlet, water collection and gas collection devices in the equipment are uniform, and the phenomenon of partial flow will not occur; 7) The internal components of the multi-media filter shall be installed and positioned in the factory, and measures shall be taken to fix and reinforce them to prevent deviation, looseness and damage during transportation, and at the same time, they can fully bear the impact of water flow. The internal devices, pipe fittings and components of the container shall be installed and fixed in the container before delivery to prevent missing parts and damage or loss during transportation; 8) The automatic valve of multi-media filter adopts pneumatic valve; 9) Stainless steel pressure gauge and UPVC sampling valve are installed on the inlet and outlet pipes of multi-media filter; 10) Multi-media filter adopts vertical arrangement; 11) Refined quartz sand is used as filter material. (4) Activated carbon filter is used to absorb organic matter and harmful substance in raw water, reduce COD content and absorb oxidizing substance in water, prevent reverse osmosis membrane from being polluted by organic matter and oxidized by oxidizing substance, and protect subsequent equipment from pollution. As this softened water system will carry a small amount of oil passing through the customer's water equipment during circulation, after being intercepted by the filter materials in the multi-segment filter, the remaining small part can be efficiently adsorbed by activated carbon, and the adsorption rate can be as high as over 98%, thus ensuring excellent and stable inlet water quality of the softener and subsequent equipment. The activated carbon filter is backwashed after a period of operation. During backwashing, the adsorbate can fall off and be discharged by the backwashing drainage pipe for the next operation cycle. This system is equipped with 6 activated carbon filters with the specification of ￠2700, which are filled with refined activated carbon with a filter layer height of 1200mm, a filter flow rate of 12.2m/h and a water yield of 70m3/h/ set. The activated carbon filter is placed behind the multi-media filter, which can prevent suspended solids and colloids in raw water from blocking activated carbon micropores and pores between carbons, reduce backwashing times and increase adsorption capacity of activated carbon. Has the following advantages:-can effectively remove organic matters and the like in raw water. -the filter runs for a long time. -The water distribution device at the bottom of the filter adopts perforated plate+water cap. Technical parameters: working pressure: < 0.6MPa; working temperature: 5-50℃; backwashing strength: 3L/m2.s; packing height: 1200mm; structural form: the equipment consists of body, water distribution device, water collection device, external piping and instrument sampling device. The water inlet device is upper water inlet and horn water distribution, and the water collecting device is perforated plate+water filter cap; The external piping of the equipment body is equipped with valves, pressure gauges and sampling interfaces, which is convenient for users to realize the normal operation of the equipment on site. Continuous operation time: the design operation time of the system is 48-72 hours, and then the activated carbon filter is backwashed; The backwashing cycle should be adjusted according to different seasons and changes in water quality to ensure that the turbidity of effluent is less than 1 NTU. Backwashing flow rate: the purpose of backwashing is to loosen the activated carbon in reverse direction and wash away the interception on the filter layer, so as to clean the filter layer. Generally, the backwashing intensity is controlled at about 3L/m2.s, and it is better that the activated carbon is not washed away. Backwashing time: the length of backwashing time is related to the interception amount of the packing layer. The backwashing time can be determined according to the turbidity of backwashing drainage. Under normal circumstances, the turbidity of backwashing is less than 1NTU, and the time is about 15 minutes, which can be appropriately adjusted according to the operation conditions. Positive washing flow: the positive washing flow can be about 70m3/h/ set. Positive washing time: the turbidity of positive washing water is 1 NTU, and it usually takes about 10 minutes. Technical requirements: 1) The activated carbon filter is a cylindrical container welded by steel, the material of the equipment body is carbon steel, the main weld seam is submerged arc automatic welding, and the design and manufacture meet the standards; 2) The inner wall of the activated carbon filter is lined with rubber for anticorrosion, and the lining is vulcanized by a vulcanizing kettle, and the bulk vulcanization process is rejected. Rubber lining thickness is not less than 3mm. All rubber linings are complete without any leakage points, and have been tested by 20kv EDM. 3) Hydrostatic test shall be carried out before rubber lining of activated carbon filter. The rubber lining of the inner wall of the equipment is complete without pinholes and any leakage points. It can accept 15kv～20kv electric spark test without breakdown. The rubber lining layer extends to the joint surface of the external nozzle flange. Rubber lining equipment is vulcanized integrally in vulcanization tank, and reclaimed rubber is not used for rubber plate; 4) Two manholes are set on the activated carbon filter body, which ensure the access of maintenance personnel and replacement parts. The inner surface of manhole and manhole cover is flush with the inner surface of container. Manholes are equipped with manhole covers, washers, bolts, nuts and lifting rods; 5) The activated carbon filter is provided with two sight glasses. The material of the sight glasses is transparent and corrosion resistant, and its thickness can withstand the design pressure of the container and the test pressure during the test. The inner surface of the sight glasses is flush with the inner surface of the container; 6) The water distribution and water collection devices inside the activated carbon filter can ensure uniform water flow in the whole filter layer and prevent partial flow deviation. The water outlet device can not only uniformly collect water, but also uniformly distribute backwashing water flow through the bed layer, and the backwashing drainage device can meet the design requirements of maximum backwashing water volume. Uniform water inflow and water collection inside the equipment, without the phenomenon of partial flow; 7) The internal components of activated carbon filter shall be installed and positioned in the factory, and measures shall be taken to fix and reinforce them to prevent deviation, looseness and damage during transportation, and at the same time, they can fully bear the impact of water flow. The internal devices, pipe fittings and components of the container shall be installed and fixed in the container before delivery to prevent missing parts and damage or loss during transportation; 8) The automatic valve of activated carbon filter adopts pneumatic valve; 9) Stainless steel pressure gauge and UPVC sampling valve are installed on the inlet and outlet pipes of activated carbon filter; 10) The activated carbon filter is vertically arranged; 11) the filter material adopts refined activated carbon.