CN204607814U - A kind of New Tail water extraction mark treatment system - Google Patents

Abstract

The utility model discloses a novel tail water standard-raising treatment system, which comprises a coarse grid pool, a fine grid pool, a grit chamber, a biochemical reaction pool, a secondary sedimentation pool, an intermediate pool, a disinfection outlet pool, and an intermediate pool The biological aerated filter, the high-efficiency sedimentation tank and the screen filter used to remove suspended solids are also connected in sequence between the disinfection outlet tank. The water outlet of the type filter is connected with the water inlet of the disinfection outlet pool; the filter mesh of the screen type filter is 5-20um in precision, and the flow rate is 5-15m ³ /h. The utility model can make the tail water after standard upgrading and treatment stably meet the requirements of Class IV water bodies in the "Environmental Quality Standard for Surface Water" (GB3838-2002), and reduce the harm of sewage to the environment.

Description

A New Tail Water Raising Treatment System

technical field

The utility model relates to sewage treatment technology, in particular to a novel tail water standard raising treatment system.

Background technique

With the rapid development of population and social economy, the discharge of industrial wastewater and domestic sewage is increasing day by day. The construction and operation of sewage treatment plants have reduced the pollution load of sewage and wastewater on surface water to a certain extent. At present, most sewage treatment plants implement the first-level B or first-level A discharge standards in the national "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and the tail water is basically discharged directly into the sewage body. According to the "Surface Water Environmental Quality Standards" (GB3838-2002), the water area function and classification standards stipulate that the minimum surface water standard is Class V water, which is mainly applicable to agricultural water areas and water areas with general landscape requirements. Comparing the main indicators in the two standards, it can be seen that the current discharge standard for sewage treatment plants is still inferior to the Class V standard for surface water, and there is still the potential to aggravate the deterioration of the water body environment. The tail water discharge waters of some sewage treatment plants belong to the tributaries or upstream waters of drinking water sources. In order to ensure that the water sources are free from pollution and ensure the normal living water of residents, it is imperative to improve the tail water discharge standards of sewage plants in some sensitive waters.

The existing mature process flow of sewage treatment is: water inlet→coarse grid→fine grid→grit chamber (primary sedimentation tank)→biochemical reaction tank→secondary sedimentation tank→filter (level A)→disinfected water, the process It can only meet the first-class B or first-class A discharge standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and cannot meet the effluent water quality requirements after further standardization. Moreover, the concentration of pollutants in the secondary biochemical treatment effluent is relatively low, and it is difficult to remove them by conventional biochemical treatment methods.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of this utility model is to provide a new tail water standard treatment system, so that the tail water after the standard treatment can stably reach the Class IV of "Surface Water Environmental Quality Standard" (GB3838-2002) Water body requirements, reduce the harm of sewage to the environment.

The purpose of this utility model adopts following technical scheme to realize:

A new type of tail water upgrading treatment system, including a coarse grid tank, a fine grid tank, a grit chamber, a biochemical reaction tank, a secondary sedimentation tank, an intermediate tank (retrofitted from the original filter tank) and a disinfection effluent tank connected in sequence. The intermediate pool and the disinfection outlet pool are connected in turn with a biological aerated filter, a high-efficiency sedimentation tank, and a screen filter for removing suspended solids. The water inlet of the biological aerated filter is connected with the outlet of the intermediate pool. The water outlet of the strainer filter is connected with the water inlet of the disinfection outlet pool; the mesh precision of the strainer filter is 5-20um, and the flow rate is 5-15m ³ /h.

Preferably, the biological aerated filter comprises a plurality of parallel upflow filter tanks.

Preferably, the novel tail water upgrading treatment system further includes a backwash water discharge tank, and the biological aerated filter has a built-in backwash device, and the outlet of the backwash device is connected to the water inlet of the backwash water discharge tank.

Preferably, the high-efficiency sedimentation tank includes a mixing zone for mechanical stirring and a sedimentation zone for precipitation, and the mixing zone and the sedimentation zone are connected to each other.

Preferably, the settling area is built with a plurality of inclined pipes arranged side by side.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The utility model has a good treatment effect on the difficult-to-remove low-concentration ammonia nitrogen, organic matter, total phosphorus and bacteria, and the effluent water quality is stable. The low-concentration BOD ₅ , COD, TOC and other pollutants removed have the functions of deep nitrogen and phosphorus removal, disinfection and sterilization, and the effluent water quality can stably meet the requirements of the "Surface Water Environmental Quality Standard" GB3838-2002 Class IV water body requirements;

(2) The utility model is only aimed at the rear section modification of the sewage treatment process equipment, basically does not involve the removal of the original structures and pipelines, and does not affect the normal operation of the sewage plant;

(3) The utility model has the advantages of modularization, high degree of automation, high efficiency, quick construction, convenient operation and management, long service life, low depreciation cost and high cost performance.

Description of drawings

Fig. 1 is a connection schematic block diagram of a novel tail water labeling treatment system of the present invention;

Fig. 2 is a schematic diagram of the connection between the intermediate pool and the disinfection outlet pool of the present invention.

In the figure: 1. Intermediate pool; 2. Biological aerated filter; 21. Upflow filter; 3. High-efficiency sedimentation tank; 31. Mixing area; 32. Sedimentation area; 33. Inclined pipe; 4. Screen filter 5. Disinfection outlet pool; 6. Backwash water discharge pool.

Detailed ways

Below, in conjunction with accompanying drawing and specific embodiment, the utility model is described further:

As shown in Figure 1-2, a new type of tail water standardization treatment system includes a coarse grid tank, a fine grid tank, a grit chamber, a biochemical reaction tank, a secondary sedimentation tank, and an intermediate tank (the original filtration tank) connected in sequence. pool renovation) and the disinfection outlet pool, the intermediate pool and the disinfection outlet pool are connected in turn with a biological aerated filter, a high-efficiency sedimentation tank and a screen filter for removing suspended solids, and the water inlet of the biological aerated filter It is connected to the water outlet of the intermediate pool, and the water outlet of the strainer filter is connected to the water inlet of the disinfection outlet pool; the filter mesh precision of the strainer filter is 5-20um, and the flow rate is 5-15m ³ /h.

Among them, the effluent from the high-efficiency sedimentation tank enters the filter screen filter, the filter screen precision is preferably 10um, and the flow rate is preferably 8m ³ /h, so as to achieve the precision filtration effect. Meet the design water SS≤5mg/L, so that it has a very high removal rate for suspended solids such as SS.

After the effluent of the screen filter is sterilized by the disinfection effluent pool, the water quality can meet the requirements of the "Surface Water Environmental Quality Standard" GB3838-2002 Class IV water body requirements.

As a preferred embodiment, the biological aerated filter includes a plurality of parallel upward flow filter tanks. The new tail water standardization treatment system also includes a backwash water discharge pool, and a backwash device (not shown in the figure) is built in the biological aerated filter. The water outlet of the backwash device and the water inlet of the backwash water discharge pool connected. After the original filter is transformed into an intermediate pool, the outlet water passes through the pump station of the intermediate pool to increase the pressure, first enters the biological aerated filter, and runs through the multiple cells of the biological aerated filter in parallel, and adopts the form of upward flow, single cell The filtration area is 35m ² , the average rising velocity is controlled to be 3.57m/h, the thickness of the filter material is 3.2m, and the backwash cycle is 24h. The biological aerated filter fully draws on the design ideas of the sewage treatment contact oxidation tank and the water supply fast filter tank, which integrates the characteristics of aeration, high filtration rate, interception of suspended solids, and regular backwashing. It is a high-efficiency , low-cost, small-volume sewage treatment system. The sewage can be quickly purified and removed from COD and BOD ₅ through the strong oxidative degradation ability of the high-concentration biofilm on the surface of the filter material, and can simultaneously remove nitrogen and phosphorus.

As another preferred embodiment, the high-efficiency sedimentation tank includes a mixing zone for mechanical stirring and a sedimentation zone for adding flocculant, and the mixing zone and the sedimentation zone are connected to each other. The settling area is built with multiple inclined pipes arranged side by side. The effluent from the biological aerated filter enters the high-efficiency sedimentation tank. According to the raw water conditions, the high-efficiency sedimentation tank will add PAC 20mg/L and PAM 3mg/L to the mixing area when necessary, and enter the sedimentation area after being fully coagulated by mechanical stirring. The sedimentation area adopts inclined tube sedimentation, and the surface load is controlled at 6.0m ³ /m ² ·h. Due to the recycling of the flocs in the high-efficiency sedimentation tank, the use effect of the flocculant can be significantly improved, and 10% to 15% of the chemical agent can be saved. The arrangement of the inclined tube improves the sedimentation effect, has a higher sedimentation velocity, and the water production rate per unit area is significantly increased. Sewage flocculation and sedimentation can effectively remove low-concentration suspended solids, thereby reducing the concentration of TP in water.

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and ideas described above, and all these changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims (5)

1. A new type of tail water treatment system, characterized in that: it includes a coarse grid tank, a fine grid tank, a grit chamber, a biochemical reaction tank, a secondary sedimentation tank, an intermediate tank and a disinfection outlet tank connected in sequence, and the middle The water tank and the disinfection outlet tank are also connected in turn with a biological aerated filter tank, a high-efficiency sedimentation tank and a screen filter for removing suspended solids. The water inlet of the biological aerated filter tank is connected with the water outlet of the intermediate tank. The water outlet of the mesh filter is connected with the water inlet of the disinfection outlet pool; the filter mesh of the filter mesh filter has a mesh precision of 5-20um and a flow rate of 5-15m3/h. 2. The novel tail water upgrading treatment system according to claim 1, characterized in that the biological aerated filter comprises a plurality of parallel upward flow filter tanks. 3. The novel tail water treatment system according to claim 2, characterized in that: the new tail water treatment system also includes a backwash water discharge pool, and the biological aerated filter has a built-in backwash device, and the backwash The water outlet of the device is connected with the water inlet of the backwash water discharge pool. 4. The novel tail water upgrading treatment system according to claim 3, characterized in that: the high-efficiency sedimentation tank includes a mixing zone for mechanical agitation and a sedimentation zone for sedimentation, and the mixing zone and the sedimentation zone are connected to each other. 5. The novel tail water upgrading treatment system according to claim 4, characterized in that: the settling area is built with a plurality of inclined pipes arranged side by side.