CN202449871U - Multi-medium filter - Google Patents

Abstract

The utility model discloses a multi-media filter, which solves the problems of poor degreasing effect and complicated pipeline connection of the existing multi-media filter. It includes a tank body, which is provided with a bottom water distribution area, a middle support area and an upper filter material area. The support area is filled with Ф3-5mm gravel, and the filling thickness is 200-300mm; the filter material The area is composed of an upper coarse filter layer and a lower fine filter layer, the particle size range is 1.6-3.0mm, and the filling thickness is 400-600mm. The fine filter layer filler is quartz sand, and its particle size range is 0.5-1.2m. The filling thickness is 600-800mm. The utility model is a multi-media filter with simple structure, high oil removal efficiency and simple operation, which can ensure long-term stable operation of the system.

Description

Multimedia filter

technical field

The invention relates to a filter device, in particular to a multimedia filter. the

Background technique

Multi-media filters are usually used for the treatment of oil-free domestic sewage, which has a good turbidity reduction effect. However, for the comprehensive wastewater of iron and steel enterprises, the comprehensive wastewater contains a certain amount of oil due to the mixing of cold rolling fluid from cold rolling plants. The oil content of the reused wastewater after discharge treatment (treated by physical and chemical method) of iron and steel enterprise comprehensive wastewater is still 0.8-4mg/L, and the COD is 15-40mg/L, which will cause membrane pore blockage for the later use of ultrafiltration + reverse osmosis Seriously, it is difficult to clean, shorten the running cycle and increase the cost of chemical cleaning. However, the tank body in the current quartz filter is only composed of a supporting area and a filter material area. The filter material area only has quartz sand as a filling material. The filtering effect is relatively simple, and the retention efficiency of oil is still not high. Pretreatment for oil removal before filtration + reverse osmosis process. the

Contents of the invention

The purpose of this utility model is to solve the above-mentioned technical problems and provide a multi-media filter with simple structure, high oil removal efficiency and simple operation. the

The technical solution includes a tank body, which is provided with a water distribution area at the bottom, a support area in the middle, and a filter material area at the upper part, and is characterized in that the filler in the support area is Ф3-5mm gravel, and the filling thickness is 200- 300mm; the filter area is composed of the upper coarse filter layer and the lower fine filter layer, the particle size range is 1.6-3.0mm, and the filling thickness is 400-600mm. The fine filter layer filler is quartz sand, and its particle size range It is 0.5-1.2m, and the filling thickness is 600-800mm. the

The lower part of the water distribution area at the bottom of the tank communicates with the filter water outlet, the backwash water inlet, the backwash air inlet and the emptying port, and the upper part of the filter particle area of the tank body communicates with the filter water inlet and the backwash water outlet. the

The fine filter layer is composed of two layers of quartz sand layers with different particle sizes, each layer is 300-400mm thick, the particle size of the upper layer is 0.5-0.8mm, and the particle size of the lower layer is 0.8-1.2mm. the

The water quality of the reused waste water described in the present invention (that is, the waste water after the comprehensive waste water of iron and steel enterprises has been discharged and treated) is completely different from the usual domestic sewage (oily and high in COD), so the applicant has carried out in-depth research on the filter material area in the multi-media filter. Research, add a coarse filter layer above the quartz sand layer, the coarse filter layer filler can use one of anthracite, ceramic filter and activated carbon, and the particle size should be larger than the fine filter layer of quartz sand, the filler of these coarse filter layers It is a porous medium with large specific surface area, high adsorption energy, good adsorption effect on oil and COD, and low filtration resistance. Further, the inventor controlled the particle size range of the quartz sand to 0.5-1.2mm. The small particle size of the quartz sand has low adsorption energy, but the pores between the sand particles are small, and the screening effect is good, which is beneficial to reduce turbidity and emulsified oil , can cooperate well with the coarse filter layer. Further research experiments have proved that the fine filter layer is composed of two layers of quartz sand layers with different particle sizes. The particle size of the upper layer is 0.5-0.8mm, and the particle size of the lower layer is 0.8-1.2mm. It intercepts oil and other substances in wastewater very well, and the effect of removing oil and reducing turbidity is the most satisfactory. At the same time, controlling the thickness of each layer not only ensures the filtering effect, but also reduces the height of the tank and reduces the investment in equipment. And because the oil is in a suspended state in water, the filtration rate of reused wastewater passing through the multi-media filter will have a great impact on its degreasing effect. If the filtration rate is too fast, the degreasing effect of quartz sand will drop sharply; slow, the coarse filter material will have poor oil removal effect, and the quartz sand filter material will harden quickly and the backwash effect will be poor; therefore, the filtration rate must be controlled at 8-10m/h, especially preferably 10m/h. Work at this filtration rate, Cooperating with the added coarse filter layer can effectively improve the oil removal, COD and turbidity effects of the filter, and alleviate the problem of filter compaction. the

In addition, in order to meet the requirements of filtration and backwashing, the inventor has rationally designed the layout of each pipeline to make it simpler and easier to operate during filtration and backwashing. the

The utility model has simple structure and simple operation, and can effectively reduce various indicators in reused wastewater after being filtered by a multi-media filter. Water inlet requirements can effectively improve the water production flux of the ultrafiltration membrane in the later stage, avoid the rapid attenuation of the ultrafiltration membrane flux caused by oil pollution, and maintain the long-term stable operation of the entire system. the

Description of drawings

Figure 1 is a schematic diagram of the structure of the present invention. the

Among them, 1-tank 1, 2-water distribution area, 3-supporting area, 4-fine filter layer, 4.1-upper fine filter layer, 4.2-lower fine filter layer, 5-coarse filter layer, 6-filter water inlet , 7-filter water outlet, 8-backwash water inlet, 9-backwash water outlet, 10-backwash air inlet, 11-empty outlet, 12-population, 13-exhaust port. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further explained:

Embodiment 1-3: Referring to Fig. 1, the multi-media filter mainly includes the water distribution area 2 located in the lower part of the tank body 1, the support area 3 in the middle and the filter material area in the upper part, the support area 3 is filled with gravel, and the filter material The zone is made of coarse filter layer 5 and fine filter layer 4, and the coarse filter layer is any one in anthracite, ceramsite or activated carbon, and fine filter layer 4 is quartz sand (the present embodiment adopts natural sea sand, which is more artificially broken than quartz sand). Sand is more suitable for use as a filter layer), and the particle size is arranged in layers (the figure shows two layers, which are 4.1 and 4.2 from top to bottom, and the specific layer thickness and particle size are shown in Table 1). The filter water inlet 6 on the tank body 1 and the backwash water outlet 9 communicate with the top of the filter particle area 4 on the top of the tank body 1 through pipelines, and the filter water outlet 7 on the tank body 1, the backwash water inlet 8, And the backwash air inlet 10 communicates with the bottom of the tank body 1 below the water distribution area 2 . The top of the tank body 1 is also provided with an exhaust port 13, and the bottom is provided with an emptying port 11, and the tank body 1 is also provided with an inlet 12 as required. the

Table 1: Grading Table of Filter Material in Examples 1-3

work process:

Filtration: The reused wastewater is sent through the pressure pipeline (recycled wastewater can be added with 4-5mg/L flocculant for micro-flocculation according to the needs) from the filter inlet 6 to the top of the filter material area of the tank 1 through the pipeline, and then through the The coarse filter layer 5, the upper layer fine filter layer 4.1, the lower layer fine filter layer 4.2, and the support area 3 layers are filtered to remove oil and turbidity, and then flow out through the filter outlet 7 below the water distribution area 2. Backwashing: Under normal circumstances, the multi-media filter needs to be backwashed every 24 hours. The backwashing process is: water or air, or a mixture of water and air under pressure through the respective backwashing inlet 10, backwashing into The water outlet 8 is filtered and backwashed from the bottom of the water distribution area 2, through the water distribution area 2, the support area 3, the lower fine filter layer 4.2, the upper layer fine filter layer 4.1, and the coarse filter layer 5 to the top of the filter material area, and then through the pipeline from the backwash Washing water outlet 9 flows out. In order to achieve a better backwashing effect in this utility model, avoid the occurrence of hardening problems, and improve the operating cycle of the device, the preferred backwashing process is: first perform air washing for 3-5 minutes, then perform water-air mixed washing for 8-10 minutes, Finally, wash with water for 8-10 minutes, the washing strength is 8-10m ³ /m ² .h, the air washing pressure is 0.07MPa, and the amount of backwashing water is equal to that of filtering water. Those skilled in the art can reasonably adjust the specific backwashing cycle according to the water outlet requirements and water quality inspection results.

Claims (3)

1. a more medium filter comprises tank body, is provided with water distributing area, the bearing area at middle part and the filtrate district on top of bottom in the said tank body, it is characterized in that said bearing area filler is a Ф 3-5mm gravel, and filling thickness is 200-300mm; Said filtrate district is made up of the coarse filtration layer on upper strata and the fine filtering layer of lower floor, and particle size range is 1.6-3.0mm, filling thickness 400-600mm, and said fine filtering layer filler is silica sand, and its particle size range is 0.5-1.2m, and filling thickness is 600-800mm.

2. more medium filter as claimed in claim 1; It is characterized in that; Said tank base water distributing area below with filter out the mouth of a river, backwash water-in, backwash inlet mouth and evacuation port and be communicated with, tank body top filter grain is communicated with filtered water inlet mouth and backwash water outlet above distinguishing.

3. according to claim 1 or claim 2 more medium filter is characterized in that said fine filtering layer is made up of the quartz sand layer of two-layer different-grain diameter, and every layer of 300-400mm is thick, and the upper strata particle diameter is 0.5-0.8mm, and lower floor's particle diameter is 0.8-1.2mm.