CN201648104U - A sleeve filter device for sewage reuse - Google Patents

Abstract

A sleeve filter device for sewage reuse relates to the field of sewage treatment and reuse. The utility model discloses a sewage recycling device. Its main body is a sleeve type filter. The central area of the sleeve is an upflow biological aerated filter or a deep bed filter with coarse filter material. The outer annular space of the sleeve is layered up and down, which is a slow filter running in parallel. The device makes full use of the external space of the biological aerated filter, effectively avoids the disadvantage of a large area occupied by the slow filter, uses the fast filter to remove turbidity and organic matter and provides low turbidity inflow water for the slow filter The filter further removes turbidity, and removes color and odor, etc. The device can be used for advanced treatment of secondary sewage treatment effluent to produce high-quality reclaimed water.

Description

A sleeve filter device for sewage reuse

technical field

The utility model relates to the field of sewage treatment and reuse, and is a device for sewage reuse or advanced treatment of sewage.

Background technique

Sewage reuse is an effective way to solve the shortage of water resources in my country. For this reason, many cities in our country have built sewage reuse projects one after another, and reclaimed water reuse devices have also been installed in residential areas and large public buildings in many cities. However, there are many deficiencies in the sewage reuse devices currently on the market. For example, although the treatment cost of the device based on clarification and filtration is low, the quality of the effluent is poor; the device based on membrane technology has low turbidity and good water quality, but the investment and operation costs are high; the core unit is the artificial wetland. Although the operating cost of the device is low, the floor area is too large; although the device based on activated carbon adsorption can effectively remove color and odor, the investment and operating cost are relatively high. For this reason, it is urgent to develop a sewage recycling device with high efficiency, low consumption and small footprint.

Utility model content

The utility model provides a combined device for recycling sewage. The device is used for advanced treatment of effluent from secondary sewage treatment, and has the advantages of good effluent quality, small floor space and low operating cost.

A sewage regeneration treatment and reuse device, characterized in that it includes two concentric columns nested together, the inner column is a biological aerated filter; the annular space surrounded by the outer column and the inner column is at least divided into upper and lower two Two slow filter tanks running in parallel; the biological aerated filter tank and the slow filter tank are separated in space by the enclosure structure of the biological aerated filter tank; the outlet pipe of the biological aerated filter tank and the backwash drain pipe of the biological aerated filter tank Share a pipe with the slow filter inlet pipe;

The pipeline is provided with at least three valves; two of the valves are respectively arranged at the water inlet of the slow filter tank, and one valve is arranged at the end of the pipeline for drainage. Three pipeline functions are realized by switching the valve on the pipeline.

The technical scheme that the utility model adopts is:

(1) In terms of technology, the combination of biological aerated filter and slow filter is adopted. Biological aerated filter not only has filtering function, can remove suspended particles in water, reduce water turbidity, but also has biological function, can degrade dissolved organic matter and nitrified ammonia nitrogen. Slow filtration has good effluent quality, not only can reduce the turbidity of water, but also has a good removal effect on color, odor, bacteria and viruses. Moreover, the operation cost of the slow filter is low, and the management is simple.

When the concentration of organic matter in the influent is low, the aeration can also be stopped, and the biological aerated filter can be operated as a normal fast filter.

(2) In terms of shape, the biological aerated filter belongs to the "thin and tall" type, while the slow filter belongs to the "short and fat" type. In order to make full use of the space and reduce the occupied area, the biological aerated filter and the slow filter are spatially combined to form a vertical sleeve shape. That is, the central small sleeve serves as the biological aerated filter, and the annular space surrounded by the outer cylinder and the central small sleeve serves as the slow filter. The biological aerated filter is located in the center of the slow filter. The enclosure structure of the biological aerated filter is used to separate the two in space. According to the height of the biological aerated filter, the annular space of the sleeve can be divided into upper and lower layers, as a slow filter running in parallel. In the specific design, the design parameters of the biological aerated filter and the slow filter should be determined according to the water quality, and then the number of slow filter layers, the central area of the sleeve (biological aerated filter) and the outer annular area (slow filter) should be determined. area.

(3) In order to arrange compactly and save pipe materials, the outlet pipe of the biological aerated filter, the backwash drain pipe of the biological aerated filter and the inlet pipe of the slow filter share one pipe. Three pipeline functions are realized by switching the valve on the pipeline.

The secondary treatment effluent of sewage is used as the water inflow of the device of the utility model. Water enters from the bottom of the central space of the sleeve (the bottom of the biological aerated filter), flows upward to the top of the central space of the sleeve (the top of the biological aerated filter), and then enters the upper and lower layers of the annular area of the sleeve through the diversion device (slow filter). The water enters the water collection device after being slowly filtered, and then enters the clean water tank for disinfection and other next steps. The backwashing of the biological aerated filter adopts the upward flow operation mode. When backwashing, the device stops water intake, and the backwashing water is discharged through the diversion device. When the slow filter needs sand scraping, the device stops water intake, empty the slow filter, and then manually scrape the sand.

The technical scheme fully utilizes the advantages of the two filtering methods. The biological aerated filter has a fast filtration rate, which can effectively remove suspended solids, chemical oxygen demand (COD), biochemical oxygen demand (BOD), turbidity and ammonia nitrogen and other pollutants in the water, and provide low turbidity for the slow filter. water, avoiding the clogging of the slow filter. The slow filter has a good removal effect on color and odor. After the combination of the two, the effluent water quality can reach or even exceed the first-class A standard in the pollutant discharge standard for urban sewage treatment plants (GB 18918-2002) and the urban miscellaneous water quality for urban sewage recycling (GB/T 18920-2002) standard. The water can be used for toilet flushing, road cleaning, fire protection, urban greening, vehicle washing, non-drinking water for building construction and water for landscape environment, etc.

The sleeve structure avoids the disadvantages of biological aerated filter and slow filter. The biological aerated filter covers a small area, but the pool body is relatively high, generally above 4m. The slow filter covers a large area, but its height is limited, which may not exceed 2m. Therefore, the two are made into a sleeve-shaped structure, which greatly saves the occupied area and space compared with placing two filter tanks separately.

Description of drawings:

Fig. 1 is a structural sectional view of the utility model.

Detailed ways

The main structure of the device of the utility model is composed of two concentric columns nested together, and the inner column is a biological aerated filter tank 1 . The annular space surrounded by the outer column and the inner column is divided into two upper and lower slow filter tanks running in parallel. The cross-section of the columns can be, but not limited to, circular or rectangular.

The enclosure structure of the biological aerated filter is used to separate the biological aerated filter and the slow filter in space; the outlet pipe of the biological aerated filter, the backwash drain pipe of the biological aerated filter and the inlet pipe of the slow filter are combined root pipeline; that is, the shunt pipe 18 in the figure.

The pipeline is provided with at least three valves; two of the valves are respectively arranged at the water inlet of the slow filter tank, and one valve is arranged at the end of the pipeline for drainage. Three pipeline functions are realized by switching the valve on the pipeline.

The biological aerated filter 1 is composed of a mixing chamber 13 connected with a water inlet pipe 11 and an air inlet pipe 12 , a porous plate 14 , a support layer 15 , a filter layer 16 , and a clear water area 17 connected with a shunt pipe 18 from bottom to top. Valve I 48, valve II 46 and valve III 45 are set on the shunt pipe. In addition, the water inlet pipe 11 is equipped with a water inlet valve IV42 and a backwash water inlet valve V41; the air inlet pipe 12 is provided with an air inlet valve VI44.

Slow filter I 2 and slow filter II pool 3 have the same composition. Taking the slow filter 12 as an example, it is composed of a water storage area 21, a sand layer 22, a supporting layer 23 and a water collection pipe 24 from top to bottom. Wherein the water collecting pipe 24 is equipped with a valve VIII47.

The utility model device mode of operation is as follows;

When filtering, open the water inlet valve IV42, close the backwash water inlet valve V41, and water enters the mixing chamber 13 through the water inlet pipe 11. At the same time, the intake valve VI44 is opened, and the air enters the mixing chamber 13 through the intake pipe 12 . Water and air are mixed in the mixing chamber 13 and enter the supporting layer 15 through the porous plate 14, then enter the filter layer 16, then enter the clean water area 17, and finally enter the distribution pipe 18. At this time, the valve III45 on the shunt pipe is closed, and the valve I48 and the valve II46 are opened. Water enters the slow filter tank I 2 through the valve I 48, and enters the slow filter II tank 3 through the valve II 46.

When BAF 1 backwashes, close water inlet valve IV42, open backwash water inlet valve V41, and open air inlet valve VI44. At the same time, close the valve I48 and the valve II46 on the shunt pipe, open the valve III45, and discharge the backwash waste water.

Two slow filters run in parallel. Taking the slow filter I 2 as an example, the water from the biological aerated filter 1 first enters the water storage area 21 through the valve I 48 during filtration, then slowly flows through the sand layer 22, and enters the water collection pipe 24 located inside the supporting layer 23 , and finally discharged through valve VIII47.

When the slow filter needs to scrape sand, close the inlet valve IV42, inlet valve VI44 and backwash inlet valve V41 of biological aerated filter 1. Then open valve VIII47 to empty the slow filter tank I 2, and scrape off the surface of the sand layer 22 in the slow filter tank I 2.

The device of the utility model is used for advanced treatment of sewage, and can be used for regeneration treatment of effluent after secondary treatment of sewage. After passing through the device, the secondary effluent can be used for toilet flushing, road cleaning, fire protection, urban greening, vehicle washing, building construction and other urban miscellaneous purposes or landscape water replenishment after disinfection.

Claims (1)

1. a sleeve filtration unit that is used for reusing sewage is characterized in that, comprises two concentric column that are nested together, and inner prop is a BAF; The annulus that column jacket and inner prop surround is divided into the slow filter of two parallel runnings up and down at least; Utilize the building enclosure of BAF that BAF and slow filter are spatially separated; BAF rising pipe, BAF back flushing water shoot and slow filter water inlet pipe share a pipeline.

Images