CN202658053U - Buried sewage treatment device - Google Patents

Abstract

The utility model discloses an underground sewage treatment device, which comprises a regulating tank, a primary sedimentation tank, an anaerobic biological filter, an aerobic biological contact oxidation tank, a secondary sedimentation tank, a sand filter and a disinfection tank; wherein, The connection sequence of each component is: regulating tank, primary sedimentation tank, anaerobic biological filter, aerobic biological contact oxidation tank, secondary sedimentation tank, sand filter tank, disinfection tank.

Description

An underground sewage treatment device

technical field

The utility model belongs to the field of sewage treatment devices, in particular to an underground sewage treatment device.

Background technique

In the process of urban development, the construction of some urban infrastructure such as sewage treatment plants often lags behind the construction of the city. In areas where the urban sewage pipe network does not reach, domestic sewage treatment in residential quarters has always been a difficult problem to solve. According to incomplete statistics, the pollutants of domestic sewage in cities have accounted for 40% to 50% of the total amount of water pollutants. In order to solve the problem that the sewage collection system of urban underground waterways in our country is not perfect and the coverage rate of sewage treatment plants is low, and the domestic sewage in many living quarters that cannot be taken over is directly discharged without treatment, resulting in serious environmental pollution.

Domestic sewage includes feces and its flushing water, kitchen cooking water, bathing waste water and all waste water. According to the fifth national census, China's rural population is about 888 million, accounting for 70.1% of the total population. With the rapid development of towns and villages and the rapid improvement of the living standards of the vast rural people and the obvious improvement of living conditions, the population is increasingly concentrated, and the discharge of rural domestic sewage continues to increase. By 2010, the sewage discharge of Chinese villages and towns will be about 27 billion t. However, the domestic sewage treatment capacity in towns and rural areas in my country is low and the treatment methods are backward. The main means is to build standardized septic tanks. The biogas septic tanks currently used must be treated by subsequent facultative or aerobic filters to achieve national comprehensive sewage discharge. secondary standard. In recent years, domestic researchers have applied biochemical or physicochemical treatment technologies for urban or industrial sewage, such as UASB (upflow anaerobic sludge bed), SBR (sequencing batch bioreactor), membrane bioreactor and buried contactor. Oxidation ponds are difficult to popularize and apply in rural areas due to large investment, high energy consumption, high operating costs, and difficult management; and the artificial wetland technology and the artificial composite ecological bed developed on the basis of more researches. The treatment technology also has the disadvantages of low organic load, high seasonal influence on treatment effect and difficult daily maintenance.

The utility model discloses a buried sewage treatment device, briefly describes the actual situation of the buried sewage treatment device in engineering design and engineering application, analyzes the advantages and disadvantages of the powered buried sewage treatment device, and puts forward the application According to the actual situation of the project, it is recommended to select the sewage treatment device.

Utility model content

The technical purpose of the utility model is to disclose a buried sewage treatment device. The sewage treatment system mainly adopts the biological contact oxidation method, and uses aerobic bacteria to decompose the organic matter in the sewage under aerobic conditions. The waste and floating matter enter the adjustment tank, and the AS-type sewage pump is used to tear, cut off, and transport the fibrous material to the biological contact oxidation tank for biological treatment. Through the action of the biofilm on the filler of the contact oxidation tank, the sewage is purified; the sewage and contact The biofilm shed in the oxidation tank flows into the secondary sedimentation tank together for sewage separation. The sewage clarified by the sedimentation tank flows into the sand filter tank for advanced treatment, and then enters the disinfection tank for treatment. After disinfection, the sewage has completed various treatments and is reused or discharged.

For realizing the utility model utility model purpose, adopt following technical scheme:

1. An underground sewage treatment device, characterized in that it consists of a regulating tank, a primary sedimentation tank, an anaerobic biological filter, an aerobic biological contact oxidation tank, a secondary sedimentation tank, a sand filter, and a disinfection tank; wherein, The connection sequence of each component is: regulating tank, primary sedimentation tank, anaerobic biological filter, aerobic biological contact oxidation tank, secondary sedimentation tank, sand filter tank, disinfection tank.

2. The regulating pool mentioned above mainly regulates the water quality and quantity of sewage, and the regulating volume depends on the inhomogeneity of incoming water. Generally, the average water quantity of 6-8 hours is taken. There is a pre-aeration device in the pond, which can avoid the Anaerobic fermentation of sewage.

3. The above-mentioned primary sedimentation tank, which is land-saving, generally adopts a vertical flow sedimentation tank, with an ascending flow rate of 0.2-0.4 mm/s, a surface load of 1.2-1.8 m ³ /m ² ·h, and the effluent flows to anaerobic organisms by itself. filter, and the settled sludge is lifted to the sludge tank by air.

4. The anaerobic biological filter, its length, width and height are respectively: 18 m, 3 m, 4 m, and the volume and particle size of the filter material are respectively: 50 m ³ , 35 mm. A 2.5 m thick layer of biological filter material is overhead, and the filter material is made of ceramsite with uniform size.

5. The aerobic biological contact oxidation pond adopts the plug-flow biological contact oxidation method and is equipped with a new three-dimensional elastic filler. It has certain flexibility and rigidity, good resilience performance, and the material is lighter than water. Stretch evenly in the water, make intensive multi-level cutting of water vapor, improve the transfer coefficient of dissolved oxygen, reduce air volume, maintain uniform density in three-dimensional space, make water vapor biofilm fully contact, and ensure that all indicators after sewage treatment are fully up to standard .

6. In the secondary settling tank, the biochemical sewage flows to the secondary settling tank. It is two vertical flow settling tanks running in parallel. The effect is mainly to precipitate and peel off the aging biofilm. 1.3 m ³ /m ² ·h, the ascending flow rate is 0.1-0.15 mm/s, and the sludge is lifted to the sludge tank by air.

7. The sand filter described above adopts downstream filtration and countercurrent backwashing (the filter material is quartz sand, the filter material support layer is 0.4 m, the filter material layer is 0.8 m, and the grease layer is 0.5 m).

8. In the disinfection tank mentioned above, after the water from the sand filter enters the disinfection tank, the water contains a large number of microorganisms and bacteria, etc., and the disinfection method adopts the disinfection method of contacting and dissolving solid chlorine tablets, and some chlorine dioxide generators are used for disinfection, and the disinfection time is 30 min, it can be increased to 1-1.5 h if treating hospital sewage.

Description of drawings

Fig. 1 Schematic flow chart of the buried sewage treatment device of the utility model;

In Figure 1, sewage inlet pipe 1, grille 2, regulating tank 3, primary sedimentation tank 4, anaerobic tank 5, pump lift 6, fan 7, aerobic biological contact oxidation tank 8, secondary sedimentation tank 9, sand filter tank 10 , disinfection pool 11, discharge pool 12.

Detailed ways

In conjunction with Fig. 1, the utility model is further described through embodiments.

Example

The buried sewage treatment device described in the utility model, its connection sequence is as follows: sewage inlet pipe 1, grid 2, regulating tank 3, primary sedimentation tank 4, anaerobic tank 5, pump lifting 6, aerobic biological contact Oxidation pond 8, secondary sedimentation pond 9, sand filter pond 10, disinfection pond 11, discharge pond 12. The fan 7 is connected to the aerobic biological contact oxidation tank 8 for aeration.

The domestic sewage preliminarily filtered by the grid 2 enters the regulating pool 3. Due to the unevenness of the sewage flow, the regulating pool adopts a multi-purpose pool in the process design process. The regulating pool not only plays the role of regulating water quality and water quantity, but also intercepts The function of floating matter and clear oil can more effectively improve the biochemical properties of sewage treatment.

The sewage treated by the regulating tank 3 enters the primary sedimentation tank 4, and then enters two anaerobic tanks 5 connected in series, and a 2.5 m thick biological filter material layer is suspended in the anaerobic tank, and the filter material adopts a size Uniform ceramsite. In terms of filter material selection, the former filter uses ceramsite with a particle size of 45-50 mm, and the latter filter uses a particle size of 35-40 mm. In order to prevent the risk of filter clogging, three preventive measures are adopted: (1) Add a fine grid at the entrance of the filter anaerobic tank, and add a maintenance hole at the entrance to remove the blockage at any time; (2) The packing is arranged in layers, each layer of packing is 0.5-1.0 m thick, and a gap of 0.25-0.4 m is left between layers to prevent clogging and achieve the purpose of rectification; (3) Make the filter material layer so that it can rotate and leave a certain gap in the upper part The filter material layer is elevated with a rotating shaft. During normal operation, the two ends of the filter material layer are suspended by steel wires to avoid instability and tilt. When the filter material layer is clogged, use the wire rope to rotate the filter material layer and turn the filter material layer over so that the compact filter material particles move relatively and become loose. Backwashing is also carried out at the same time to achieve the purpose of clearing the blockage.

The sewage treated in the anaerobic tank 5 enters the aerobic biological contact oxidation tank 8. The contact oxidation tank is divided into three stages, and the total residence time is 4 to 5 h. After the sewage enters the contact oxidation tank, under aerobic conditions, the Organic matter is converted into stable substances through the metabolism of microorganisms attached to the filler. At the same time, aerobic bacteria grow and age and peel off from the filler surface into the sewage. The filler is a novel elastic filler, which is easy to form a film. The specific surface area of the filler can reach 400 m ² /m ³ , and the air-water ratio is about 12:1.

The biochemical sewage flows to the secondary sedimentation tank 9, which is a parallel operation of two vertical flow sedimentation tanks. The main function is to precipitate and peel off the aging biofilm. The surface load of the secondary sedimentation tank is 1-1.3 m ³ /m ² ·h , the rising flow rate is 0.1-0.15 mm/s, and the sludge is lifted to the sludge tank by air.

The sand filter 10 adopts downstream filtration and countercurrent backwashing. After the effluent from the sand filter enters the disinfection tank, the water contains a large number of microorganisms and bacteria. The disinfection method adopts the disinfection method of solid chlorine tablets contacting and dissolving, and some chlorine dioxide generators are also used. For disinfection, the disinfection time is 30 minutes, and it can be increased to 1-1.5 hours for hospital sewage.

The technological characteristics of this device:

(1) Adopt advanced A/O method (anaerobic + aerobic) treatment process;

(2) Less sludge output, no need for sludge treatment equipment;

(3) The removal rate of organic pollutants is high, the effluent water quality is stable, and the impact load resistance is strong;

(4) Nitrogen and phosphorus are removed, and the effluent can enter natural water bodies;

(5) Buried underground, occupying less land, it can also be located on the ground;

(6) Multiple units are connected to become a large-scale sewage treatment plant;

(7) Low operating cost;

(8) Less one-time investment (saving more than 50% compared with traditional crafts);

(9) Easy installation and convenient management;

(10) The buried septic tank generally does not bear the passing load, and a reinforced structure is used when there is a high load.

Claims (7)

1. a flush-with-ground type sewage treating device is characterized in that comprising by equalizing tank, preliminary sedimentation tank, anaerobic biofilter, aerobic bio-contact oxidation pond, second pond, and sand filter, sterilization pool consists of; Wherein, the successively order of connection of each component part is: equalizing tank, preliminary sedimentation tank, anaerobic biofilter, aerobic bio-contact oxidation pond, second pond, sand filter, sterilization pool.

2. flush-with-ground type sewage treating device according to claim 1 is characterized in that described equalizing tank gets the average water yield of 6-8 h, is provided with preaerator in the pond.

3. flush-with-ground type sewage treating device according to claim 1 is characterized in that described preliminary sedimentation tank adopts vertical sedimentation basin, and upflow velocity 0.2-0.4 mm/s, surface load are 1.2-1.8 m ³/ m ²H, water outlet flows automatically to anaerobic biofilter, and the mud of precipitation is carried to sludge sump with air.

4. flush-with-ground type sewage treating device according to claim 1 is characterized in that the length and width height of described anaerobic biofilter is respectively: 18 m, and 3 m, 4 m, filtrate volume and particle diameter of filter medium are respectively: 50 m ³, 35 mm filter the built on stilts thick biological filter bed of material of one 2.5 m in the anaerobic pond, and filtrate adopts haydite of uniform size.

5. flush-with-ground type sewage treating device according to claim 1 is characterized in that described aerobic bio-contact oxidation pond employing pulling flow type biological contact oxidation process, and is equipped with 3 D elastic filler.

6. flush-with-ground type sewage treating device according to claim 1 is characterized in that described second pond is 2 vertical sedimentation basin parallel runnings, and its surface load is 1-1.3 m ³/ m ²H, upflow velocity are that 0.1-0.15 mm/s spoil disposal is carried to sludge sump with air.

7. flush-with-ground type sewage treating device according to claim 1, the filtrate that it is characterized in that described sand filter is quartz sand, filtrate supporting layer 0.4 m, filter material layer 0.8 m, packed resin layer 0.5 m.

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