CN105036311A - Oxygenation filtration system suitable for advanced wastewater treatment - Google Patents

Abstract

The invention discloses an oxygenation filter system suitable for advanced treatment of sewage. Including the sewage advanced treatment tank, the lower part of the sewage advanced treatment tank is equipped with a sand guide cone, the bottom is equipped with an emptying pipe and an air pipe, the interior is provided with a filter layer, the center is provided with a sand washing pipe, and a water outlet is set around the top of the inner wall; the upper part of the water outlet is provided with a water outlet The weir, the lower part is provided with a water outlet pipe; the water distribution pipe is arranged above the sand guide cone, and the water distribution pipe is connected to the water inlet pipe through the diversion pipe; the water inlet pipe protrudes from the sewage advanced treatment tank, and a check valve, water inlet pump and oxygenation equipment are installed in sequence; The bottom of the sand pipe is equipped with a sand lifting nozzle, which passes through the sand guide cone and the center of the diversion pipe from bottom to top; one end of the air pipe is connected to the sand lifting nozzle, and the other end extends out of the advanced sewage treatment tank and is connected to the air lift pump; sand washing The device spirally surrounds the top of the sand washing pipe and connects to the sand washing outlet pipe. The invention occupies a small area, is simple to operate, does not need to stop to clean the filter layer, and provides good conditions for the removal of COD, ammonia nitrogen and TN.

Description

An Oxygenated Filtration System Suitable for Advanced Treatment of Sewage

technical field

The invention relates to a sewage treatment system, in particular to an oxygenation filter system suitable for advanced treatment of sewage.

Background technique

With the acceleration of urbanization and industrialization in our country, urban sewage treatment plants collect and treat most of the urban domestic sewage, and the discharge of this part is growing rapidly, which puts a lot of pressure on the environment in certain areas. If urban sewage treatment plants are still designed and operated in accordance with the discharge requirements of the first-level B standard of the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" (GB18918-2002), the nitrogen and phosphorus in them will accumulate in the water body over time, which will cause eutrophication of the water body .

The advanced treatment of sewage is mainly realized by single or combined physical, chemical, physicochemical and biological methods.

At present, the advanced treatment methods of domestic sewage are generally coagulation, sedimentation, filtration, and disinfection. If there are higher requirements for water quality, activated carbon adsorption, ion exchange, reverse osmosis and other methods can be selected. The slow filter tank treats the effluent of the secondary sedimentation tank, which has a good removal effect on turbidity, COD, and chroma; the flocculation sedimentation-V-type filter tank can deeply treat low-carbon domestic sewage. At the same time, studies have shown that the combination of microfiltration, nanofiltration, ultrafiltration, and reverse osmosis can also achieve advanced treatment of sewage. The advanced treatment of domestic sewage can also be realized by using biological methods and membrane treatment methods, such as MBR, BAF, moving bed biofilm reactor, biofiltration, artificial wetland, etc. However, there are deficiencies in these methods, mainly in:

1. The chemical advanced treatment method requires the addition of chemical agents, which not only increase the operating cost, but may also affect natural water bodies;

2. The membrane of the membrane advanced treatment method needs to be replaced, and the replacement cost is high. At the same time, the cleaning solution of the membrane is likely to cause secondary pollution;

3. The slow filter and artificial wetland occupy a large area, which is not suitable for the advanced treatment of sewage in some areas with tight land use;

4. Some treatment methods such as BAF need to stop and backwash, which will easily affect the operation effect and have certain technical requirements for the staff.

Contents of the invention

The object of the present invention is to provide an oxygenation filter system suitable for the advanced treatment of domestic sewage, which has the advantages of small floor space, easy operation, good treatment effect and stable effluent quality.

The present invention is realized in the following way: the oxygenation filtration system suitable for advanced sewage treatment includes a sewage advanced treatment tank, a sand guide cone is arranged at the lower part of the sewage advanced treatment tank; a water distribution pipe is arranged above the sand guide cone, and the water distribution pipe is connected to the sewage depth The diversion pipe in the center of the treatment pool; the other end of the diversion pipe is connected to the water inlet pipe; the water inlet pipe extends out of the advanced sewage treatment tank, and oxygenation equipment, water inlet pumps and check valves are installed on the water inlet pipe; There is a sand washing pipe; the sand washing pipe passes through the sand guide cone and the center of the diversion pipe from the lower part to the upper part. The bottom of the sand washing pipe is equipped with a sand lifting nozzle and the top is equipped with a sand washing device; the other end of the sand lifting nozzle is connected to the air The other end of the air pipe extends out of the sewage advanced treatment tank and connects to the air lift pump; the sand washing device surrounds the top of the sand lifting pipe in a spiral shape, and is equipped with a sand washing outlet pipe; the top of the sewage advanced treatment tank is equipped with a water outlet; the water outlet The upper part is provided with an outlet weir, and the lower part is provided with an outlet pipe; a filter layer is provided in the advanced sewage treatment tank; and an emptying pipe is provided at the bottom of the advanced sewage treatment tank.

The oxygenation device is an ejector.

The water distribution pipe is a perforated pipe, which distributes water radially and evenly from the center to the surrounding branch pipelines.

The filter material of the filter layer is porous sintered ceramic particles with a particle size of 0.8-3 mm, and the ratio of the height of the filter layer to the height of the sewage advanced treatment tank is 0.6-0.9:1.

The water outlet tank surrounds the top of the inner wall of the sewage advanced treatment tank, and a water outlet weir is arranged on the upper part of the water outlet tank.

Under the action of the air lift pump, the filter material at the bottom of the filter layer enters the sand washing pipe through the sand lifting nozzle and is lifted into the sand washer. After being cleaned by the sand washer, the filter material falls to the upper surface of the filter layer and pollutes The sewage with high concentration of pollutants passes through the outlet of the sand washer to the outlet pipe of sand washing, and returns to the front biological treatment unit for treatment.

The oxygenated filtration system suitable for advanced sewage treatment can choose two modes of continuous operation cleaning and intermittent periodic cleaning according to the concentration of pollutants in the sewage and the thickness of the biofilm.

Compared with the prior art, the system of the present invention is characterized in that:

1. The floor area is small. The present invention is a cylindrical tank body, and integrates operation and cleaning. There is no need to set up a backwash tank, which can reduce the floor area of the facility.

2. Before the sewage enters the sewage advanced treatment tank, it is oxygenated by oxygenation equipment. The oxygen-rich sewage forms an aerobic layer at the bottom of the filter layer to promote microbial proliferation, while the upper part of the filter layer will form an anoxic pool, which is COD, ammonia nitrogen , The removal of TN provides good conditions.

3. The developed pores of porous sintered ceramic particles in the filter material can provide a good place for biofilm growth and attachment, which improves the biological activity of the system; the adsorption and interception of porous sintered ceramic particles can also have a higher effect on SS in sewage At the same time, the high-strength characteristics of porous sintered ceramic particles prevent the filter material from being damaged during the cleaning process.

4. The cleaning mode is flexible, and two modes of continuous operation cleaning and intermittent periodic cleaning can be selected according to the concentration of pollutants in the sewage and the thickness of the biofilm.

Description of drawings

Fig. 1 is a schematic structural diagram of an oxygenated filtration system suitable for advanced sewage treatment according to an embodiment of the present invention.

Marks in the figure: 1- advanced sewage treatment tank; 2- water inlet pipe; 3- diversion pipe; 4- oxygenation device; 5- water inlet pump; 6- check valve; 7- water distribution pipe; -sand guide cone; 10-sand washing pipe; 11-sand lifting nozzle; 12-air pipe; 13-air lift pump; 14-sand washing device; 15-sand washing outlet pipe; 16-outlet pipe; 17-out Sink; 18-outlet weir; 19-empty pipe.

Detailed ways

Example:

As shown in Figure 1, an oxygenated filtration system suitable for advanced sewage treatment is established. The oxygenated filtration system suitable for advanced sewage treatment includes a sewage advanced treatment pool 1, and the size of the sewage advanced treatment pool 1 is 2.8m×6.5m ( Diameter×height), a sand guide cone 9 is provided at the bottom of the advanced sewage treatment tank 1; a water distribution pipe 7 is provided above the sand guide cone 9, and the water distribution pipe 7 is connected to the diversion pipe 3 at the center of the advanced sewage treatment tank 1; The other end of the pipe 3 is connected to the water inlet pipe 2; the water inlet pipe 2 extends out of the advanced sewage treatment tank 1, and the oxygenation device 4, the water inlet pump 5 and the check valve 6 are installed on the water inlet pipe 2; Sand washing pipe 10; the sand washing pipe 10 passes through the center of the sand guide cone 9 and the guide pipe 3 from the lower part to the upper part in turn, and the bottom of the sand washing pipe 10 is equipped with a sand lifting nozzle 11 and a sand washing device 14 at the top; The other end of the air nozzle 11 is connected to the air pipe 12, and the other end of the air pipe 12 extends out of the sewage advanced treatment tank 1 and is connected to the air lift pump 13; the sand washing device 14 surrounds the top of the sand lifting pipe 10 in a spiral shape, and is provided with a sand washing outlet pipe 15. The advanced sewage treatment tank 1 is provided with a water outlet tank 17 around the top of the inner wall; the upper part of the water outlet tank 17 is provided with a water outlet weir 18, and the lower part is provided with a water outlet pipe 16; a filter layer 8 is provided in the sewage advanced treatment tank 1; the height of the filter layer 8 is The height of the filter layer 8 is 5.2m: the height of the sewage advanced treatment tank 1=0.8, the filter material in the filter layer 8 is porous sintered ceramic particles, and the particle size is 0.8 ~ 3mm; the bottom of the sewage advanced treatment tank 1 is provided with a vent pipe 19.

An entertainment center in Guilin City uses the above-mentioned oxygenated filtration system suitable for advanced sewage treatment to treat the sewage. The steps are as follows:

The biochemically treated domestic sewage is fully oxygenated through the oxygenation equipment 4 first, and then sent to the sewage advanced treatment tank 1 through the water inlet pump 5, and the check valve 6 prevents the sewage from recharging; the sewage passes through the sewage advanced treatment tank 1 The diversion pipe 3 in the center flows to the water distribution pipe 7 for uniform water distribution; after the sewage flows out from the water distribution pipe 7, it passes through the filter layer 8 from bottom to top; due to the action of the oxygenation device 4, the sewage contains high oxygen, making An aerobic environment is formed in the lower part of the filter layer 8 to promote the proliferation of microorganisms; at the same time, the developed pore structure of the porous sintered ceramic particle filter material can provide the attachment space for the microbial film; the growth of the microbial film can improve the removal effect of COD and ammonia nitrogen in the sewage ; As the water flow rises, the dissolved oxygen content in the sewage gradually decreases, and an anoxic layer is formed on the top of the filter layer 8 to realize denitrification and reduce the total nitrogen content in the water; at the same time, because the filter layer 8 has better Adsorption and interception, the SS content in the sewage is reduced; the sewage finally flows into the water outlet tank 17 through the outlet weir 18, and is discharged to the receiving water body through the outlet pipe 16; the filter material (porous sintered ceramic particles) at the bottom of the filter layer 8 in the air Under the action of the lifting pump 13, it enters the sand washing pipe 10 through the sand lifting nozzle 11 and is lifted into the sand washing device 14. After being washed by the sand washing device, the filter material falls to the upper surface of the filter layer 8. After cleaning, the concentration of pollutants is relatively low. The high-grade sewage reaches the sand washing outlet pipe 15 through the outlet of the sand washing device 14, and returns to the front biological treatment unit for treatment; when the filtration rate is 1.04m/h and the hydraulic retention time is 5 hours, the parameters of the incoming water are : The filtration rate is v=1.04m/h, COD _Cr =65mg/L, NH ₃ -N=8mg/L, TN=20mg/L, SS=21mg/L; the parameters of effluent water quality are: COD _Cr =45mg/L L, NH ₃ -N=4mg/L, TN=14mg/L, SS=7mg/L; removal rates are: COD _Cr 31%, NH ₃ -N50%, TN30%, SS67%; running time: 6 moon.

The above-mentioned embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art will understand the various equivalent forms of the present invention All modifications shall fall within the scope defined by the appended claims of this application.

Claims (1)

1. be applicable to an oxygenation filtering system for advanced treatment of wastewater, it is characterized in that oxygenation filtering system comprises advanced treatment of wastewater pond (1), be provided with in the bottom of advanced treatment of wastewater pond (1) and lead abrasive cone (9); Lead abrasive cone (9) top and be provided with water distributor (7), water distributor (7) connects the thrust-augmenting nozzle (3) at advanced treatment of wastewater pond (1) center; Thrust-augmenting nozzle (3) the other end is connected with water inlet pipe (2); Water inlet pipe (2) stretches out advanced treatment of wastewater pond (1), and water inlet pipe (2) is provided with oxygen replenishing equipment (4), intake pump (5) and vacuum breaker (6); Advanced treatment of wastewater pond (1) center is provided with sand developing tube (10); Sand developing tube (10) is from bottom toward top successively through leading abrasive cone (9), thrust-augmenting nozzle (3) center, and sand developing tube (10) bottom is provided with and carries sand valve (11), top is provided with sand-washing device (14); Carry sand valve (11) the other end and connect blast main (12), described blast main (12) the other end stretches out advanced treatment of wastewater pond (1) and connects air lift (13); Sand-washing device (14) spirally around sand extraction tube (10) top, and is provided with washed-out sand rising pipe (15); Advanced treatment of wastewater pond (1) top is provided with effluent trough (17); Effluent trough (17) top is provided with effluent weir (18), bottom is provided with rising pipe (16); Filtering layer (8) is provided with in advanced treatment of wastewater pond (1); Bottom, advanced treatment of wastewater pond (1) is provided with blow-down pipe (19);

Described water distributor (7) is perforated pipe, by center to periphery by-pass line radially water distribution uniformity;

Described oxygen replenishing equipment (4) is ejector;

In described filtering layer (8), filtrate is porous sintered ceramic particle, and particle diameter is 0.8 ~ 3mm, and filtering layer (8) height is 0.6 ~ 0.9:1 with the ratio of advanced treatment of wastewater pond (1) height;

Described effluent trough (17) is surrounded on advanced treatment of wastewater pond (1) inwall top, is provided with effluent weir (18) on effluent trough (17) top.