CN108423942B

CN108423942B - Domestic wastewater treatment equipment

Info

Publication number: CN108423942B
Application number: CN201810345348.2A
Authority: CN
Inventors: 孙加锋; 倪冬生; 郭万鹏
Original assignee: Beijing Xiadu Water Conservancy Engineering Co ltd
Current assignee: Beijing Xiadu Water Conservancy Engineering Co ltd
Priority date: 2018-04-17
Filing date: 2018-04-17
Publication date: 2020-09-04
Anticipated expiration: 2038-04-17
Also published as: CN108423942A

Abstract

The invention relates to the field of wastewater treatment, in particular to domestic wastewater treatment equipment which comprises a drainage pipe network, an adjusting tank, a coagulation tank, a separation tank, a biochemical reaction tank and a sludge dewatering machine room, wherein the coagulation tank comprises three reaction tanks, two adjacent reaction tanks are communicated, a support is arranged above the reaction tanks, a stirring device is arranged on the support, the stirring device comprises a motor, a bearing seat, a stirring shaft, a stirring impeller and an auxiliary stirring sleeve, the auxiliary stirring sleeve is a conical sleeve, the conical bottom surface of the conical sleeve is downward, the auxiliary stirring sleeve is sleeved above the stirring impeller and fixedly connected with the reaction tanks, the stirring impeller comprises a wheel body and a plurality of main blades, the main blades are equidistantly arranged above the wheel body, the main blades are perpendicular to the wheel body and fixedly connected with the wheel body, the main blades are triangular, and the upper inclined surfaces of the main blades are parallel to the conical surfaces of the. The reaction and oxidation effects of the coagulation tank are improved through the structure of the coagulation tank.

Description

Domestic wastewater treatment equipment

Technical Field

The invention relates to the field of wastewater treatment, in particular to domestic wastewater treatment equipment.

Background

Compared with industrial wastewater, domestic wastewater not only contains inorganic impurities, but also contains a large amount of organic impurities, so that both impurities need to be purified and removed in the process of treating the domestic wastewater.

As shown in fig. 1, the existing domestic wastewater treatment equipment comprises a drainage pipe network, an adjusting tank 1 for balancing water quantity, a coagulating tank 2 for purifying inorganic matters, a separating tank 3 for solid-liquid separation, a biochemical reaction tank 4 for purifying organic matters and a sludge dewatering machine room 5 for dewatering solid separators, wherein the drainage pipe network, the adjusting tank 1, the coagulating tank 2, the separating tank 3 and the biochemical reaction tank 4 are sequentially arranged, and the water-containing slurry separated by the separating tank 3 and the biochemical reaction tank 4 is pumped to the sludge dewatering machine room 5. In the process of purifying inorganic matters in the coagulation tank 2, a neutralizer and a coagulant are added into the coagulation tank 2, the mixed solution reacts in the coagulation tank 2, inorganic impurities are gradually destabilized and flocculated under the action of the coagulant, and a stirring structure is arranged in the coagulation tank 2 for enhancing the reaction and coagulation effects.

The defects of the prior art are that the stirring structure in the coagulation tank 2 is a common stirring structure, which tightly plays a role in fully stirring and mixing the wastewater, the neutralizer and the coagulant, and in some reactions requiring oxygen participation, if ferrous sulfate is used as the coagulant (ferrous ions need to be oxidized to achieve a better coagulation effect), the common stirring structure is difficult to meet the requirements, and the coagulation effect in the coagulation tank 2 is reduced.

Disclosure of Invention

The invention aims to provide a domestic wastewater treatment device, which improves the oxidation effect of reaction in a coagulation tank.

The technical purpose of the invention is realized by the following technical scheme:

a domestic wastewater treatment device comprises a drainage pipe network, an adjusting tank for balancing water quantity, a coagulation tank for purifying inorganic matters, a separation tank for solid-liquid separation, a biochemical reaction tank for purifying organic matters and a sludge dewatering machine room for dewatering solid separators, wherein the drainage pipe network, the adjusting tank, the coagulation tank, the separation tank and the biochemical reaction tank are sequentially arranged for wastewater, the water-containing slurry separated by the separation tank and the biochemical reaction tank is pumped to the sludge dewatering machine room; the stirring device comprises a support, a stirring shaft, a stirring impeller, a motor, a bearing seat, a stirring shaft, a stirring tank, a stirring impeller, a stirring shaft and a stirring motor, wherein the bearing seat is fixedly connected above the support; the auxiliary stirring sleeve is a conical sleeve, the conical bottom surface faces downwards, the auxiliary stirring sleeve is arranged above the stirring impeller and fixedly connected with the reaction tank, the stirring impeller comprises a wheel body and a plurality of main blades, the main blades are equidistantly arranged above the wheel body, the main blades are perpendicular to the wheel body and fixedly connected with the wheel body, the main blades are triangular, and the upper inclined surfaces of the main blades are parallel to the conical surfaces of the auxiliary stirring sleeve and are close to each other.

Through adopting above-mentioned technical scheme, starter motor, the motor drives the (mixing) shaft and rotates, the (mixing) shaft drives impeller's wheel body and main blade and rotates, main blade rotates the back and can stir the liquid between supplementary stirring cover and the main blade, make the liquid between supplementary stirring cover and the main blade flow at a high speed and at peripheral production bubble, the gas of dissolving in the liquid in addition also can be under the effect that liquid flows at a high speed and appear, thereby produce more bubble in the liquid of reaction tank, make mixed liquid can with the abundant mixture of air, the reaction oxidation effect of mixed liquid has been improved.

Preferably, a plurality of stirring blades are fixedly connected to the lower portion of the wheel body, and the stirring blades and the wheel body are both arranged in an inclined manner along the circumferential direction.

Through adopting above-mentioned technical scheme, stirring vane can increase stirring effect, makes gas and liquid mixture more even.

Preferably, the bottom of the reaction tank is communicated with a gas source pipe.

Through adopting above-mentioned technical scheme, the gas source pipe can assist and pour into gas in mixing liquid.

Preferably, the equalizing basin includes from high to low be the echelonment first equalizing basin, second equalizing basin and the third equalizing basin that sets gradually, and during drainage pipe network's waste water discharged to first equalizing basin, first equalizing basin overflow to the second equalizing basin in, the second equalizing basin overflow to the third equalizing basin in.

Through adopting above-mentioned technical scheme, behind the waste water entering first equalizing basin of drainage pipe network internal discharge, the impurity of the less precipitability that the waste water is contained can be at first subsided in first equalizing basin, later the supernatant overflow gets into the second equalizing basin, the supernatant overflow in the second equalizing basin gets into the third equalizing basin, the impurity of subsiding in first equalizing basin is more like this, regularly clear up first equalizing basin can, the clearance cycle extension of second equalizing basin and third equalizing basin to reduce the clearance cost of equalizing basin.

Preferably, the number of the first adjusting tanks is more than two and the first adjusting tanks are arranged side by side.

Through adopting above-mentioned technical scheme, first equalizing basin sets up two backs side by side, and when clearing up a first equalizing basin, another first equalizing basin also can the simultaneous working, guarantees twenty-four hours uninterrupted production.

Preferably, the separation tank is an air floatation tank.

By adopting the technical scheme, when the condensate in the separation tank is lighter and is not easy to settle, the air flotation tank is adopted to separate the condensate.

Preferably, the separation tank is a sedimentation tank.

By adopting the technical scheme, when the condensate in the separation tank is easy to settle, the condensate is separated from the liquid by adopting the settling tank.

Preferably, the biochemical reaction tank comprises an aeration tank and a secondary sedimentation tank, wherein activated sludge is arranged in the aeration tank, and the underflow of the secondary sedimentation tank is pumped to the sludge dewatering machine room.

Preferably, the waste water pump of the sludge dewatering machine room is sent into the separation tank.

Through adopting above-mentioned technical scheme, contain more mud in the waste water of sludge dewatering room, pump to the separation tank after organic impurity and the inorganic impurity in the waste water of sludge dewatering room can subside the separation once more, avoid the pollution after directly discharging.

In summary, the present invention has the following technical effects:

1. the reaction and oxidation effects of the coagulation tank are improved through the structure of the coagulation tank;

2. through the structure of equalizing basin, reduced the cost and the cycle of equalizing basin clearance.

Drawings

FIG. 1 is a schematic view of an apparatus for domestic wastewater treatment;

FIG. 2 is a three-dimensional view of a coagulation basin;

FIG. 3 is a three-dimensional view of a reaction cell;

FIG. 4 is a sectional view of a reaction cell;

FIG. 5 is a schematic view of a stirring impeller;

FIG. 6 is a top view of the conditioning tank;

fig. 7 is a side view of the conditioning tank.

In the figure, 1, a regulating reservoir; 11. a first conditioning tank; 12. a second regulating reservoir; 13. a third regulating reservoir; 2. a coagulation tank; 21. a reaction tank; 22. a support; 23. a motor; 24. a bearing seat; 25. a stirring shaft; 26. a stirring impeller; 261. a main blade; 262. a wheel body; 263. a stirring blade; 27. an auxiliary stirring sleeve; 28. a gas source pipe; 3. a separation tank; 4. a biochemical reaction tank; 5. sludge dewatering machine room.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that, as used in the following description, the terms "front," "rear," "left," "right," "upper," "lower," "bottom" and "top" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in figure 1, the domestic wastewater treatment equipment comprises a drainage pipe network, a regulating reservoir 1 for balancing water quantity, a coagulation tank 2 for purifying inorganic matters, a separation tank 3 for solid-liquid separation, a biochemical reaction tank 4 for purifying organic matters and a sludge dewatering machine room 5 for dewatering solid separators, wherein the drainage pipe network, the regulating reservoir 1, the coagulation tank 2, the separation tank 3 and the biochemical reaction tank 4 are sequentially arranged, and water-containing slurry separated by the separation tank 3 and the biochemical reaction tank 4 is pumped to the sludge dewatering machine room 5. Wherein, a neutralizer is added into the coagulation tank 2 to adjust the pH value of the wastewater, a coagulant is added to flocculate inorganic impurities in the wastewater, the flocculated inorganic impurities are separated in a separation tank 3, the separated clear liquid is sent to a biochemical reaction tank 4, the biochemical reaction is utilized in the biochemical reaction tank 4 to remove the organic impurities in the wastewater, and the clear liquid is further purified by a series of treatments; mud separated in the biochemical reaction tank 4 and the separation tank 3 is pumped to a sewage desliming machine room 5, deep solid-liquid separation is carried out in the sewage desliming machine room 5, if a filter press or a centrifugal machine is adopted for dehydration, dehydrated mud cakes are transported outwards, and wastewater generated after dehydration contains a certain amount of mud impurities, and the wastewater generated by the sewage desliming machine room 5 is preferably pumped to the separation tank 3 for settlement again to avoid external discharge of polluted environment.

Can set up thick grid and hydraulic screen between drainage pipe network and equalizing basin 1, the great rubbish impurity in the domestic wastewater can be blockked to thick grid, and the hydraulic screen can filter the particle impurity that the granularity is one-level again, guarantees to get into the impurity content and the quality of water of the waste water in equalizing basin 1. The discharge of water pipe network can change at the time flow of difference, can impound through equalizing basin 1, and control domestic wastewater treatment's speed avoids the waste water flow too big and surpasss the load of system and then lead to the unqualified condition of water treatment quality to take place.

As shown in fig. 2 and 3, the coagulation tank 2 includes three reaction tanks 21, two adjacent reaction tanks 21 are communicated with each other, a support 22 is erected above the reaction tanks 21, and a stirring device is arranged on the support 22, and includes a motor 23, a bearing block 24, a stirring shaft 25, a stirring impeller 26 and an auxiliary stirring sleeve 27; the bearing seat 24 is fixedly connected above the support 22, the stirring shaft 25 is vertically arranged, the upper end of the stirring shaft 25 is rotatably connected with the bearing seat 24, the lower end of the stirring shaft 25 is positioned inside the reaction tank 21, the stirring impeller 26 is fixedly arranged at the lower end of the stirring shaft 25, the motor 23 is arranged above the support 22 and used for driving the stirring shaft 25 to rotate, and in the embodiment, the motor 23 is fixedly connected above the bearing seat 24; as shown in fig. 3 and 4, the auxiliary stirring sleeve 27 is a conical sleeve, the conical bottom surface faces downward, the auxiliary stirring sleeve 27 is sleeved on the stirring impeller 26 and is fixedly connected with the reaction tank 21, the stirring impeller 26 includes a wheel body 262 and a plurality of main blades 261, the main blades 261 are equidistantly arranged above the wheel body 262, the main blades 261 are perpendicular to the wheel body 262 and are fixedly connected with the wheel body 262, the main blades 261 are triangular, and the upper inclined surfaces of the main blades 261 are parallel to and close to the conical surfaces of the auxiliary stirring sleeve 27. The motor 23 rotates to drive the stirring shaft 25 to rotate, the stirring shaft 25 rotates to drive the wheel body 262 of the stirring impeller 26 and the main blade 261 to rotate, the main blade 261 can stir the liquid between the auxiliary stirring sleeve 27 and the main blade 261 after rotating, so that the liquid between the auxiliary stirring sleeve 27 and the main blade 261 flows at a high speed to generate bubbles at the periphery, and in addition, the gas dissolved in the liquid can also be separated out under the action of the high-speed flowing of the liquid, so that more bubbles are generated in the liquid in the reaction tank 21, the mixed liquid can be fully mixed with the air, and the reaction and oxidation effects of the mixed liquid are improved.

When the gap between the main blade 261 and the auxiliary stirring sleeve 27 is 8-16mm, the effect of generating bubbles in the reaction tank 21 is optimal.

Preferably, as shown in fig. 5, a plurality of stirring blades 263 are uniformly and fixedly connected below the wheel body 262, and the stirring blades 263 are all inclined towards one direction along the circumferential direction of the wheel body 262, so that the stirring effect of the liquid in the reaction tank 21 can be increased by the stirring effect of the stirring blades 263, and the uniform mixing of bubbles in the liquid is also facilitated.

In addition, as shown in fig. 4, a gas source pipe 28 may be provided in the bottom of the reaction tank 21, when the system throughput is large, the reaction speed in the reaction tank 21 needs to be faster, at this time, the gas source pipe 28 is opened, and a large amount of air is mixed into the mixed liquid in the reaction tank 21 through the gas source pipe 28, so as to increase the contact area between the air and the liquid and increase the reaction rate.

As shown in fig. 6 and 7, the conventional regulating reservoir 1 is generally configured as an integral reservoir, and when more impurities accumulate in the regulating reservoir 1, the inlet pipe of the delivery pump is easily blocked, and the accumulated impurities in the regulating reservoir 1 need to be cleaned periodically, which is relatively expensive. Preferably, the regulating reservoir 1 is divided into a first regulating reservoir 11, a second regulating reservoir 12 and a third regulating reservoir 13 which are sequentially arranged from high to low in a step shape, wastewater of a drainage pipe network is discharged into the first regulating reservoir 11, the first regulating reservoir 11 overflows into the second regulating reservoir 12, and the second regulating reservoir 12 overflows into the third regulating reservoir 13. After the waste water of drainage pipe net internal discharge got into first equalizing basin 11, the impurity of the less precipitability that waste water is contained can be at first subsided in first equalizing basin 11, later the supernatant overflow gets into second equalizing basin 12, the supernatant overflow in the second equalizing basin 12 gets into third equalizing basin 13, the impurity of subsiding in first equalizing basin 11 is more like this, regularly clear up first equalizing basin 11 can, the clearance cycle extension of second equalizing basin 12 and third equalizing basin 13 to reduce equalizing basin 1's clearance cost.

Further preferably, the number of the first adjusting tanks 11 is more than two and the first adjusting tanks are arranged side by side. Thus, when the first regulating pools 11 are cleaned, one of the first regulating pools can be cleaned selectively, and the other first regulating pool 11 can be put into use continuously, so that the continuity of water treatment is ensured.

The separation tank 3 can select an air floatation tank or a sedimentation tank according to working conditions. When the condensate in the separation tank 3 is light and is not easy to settle, the condensate can be separated by adopting an air floatation tank, the air floatation tank is used for scraping the air floatation and the air floatation is removed, and a part of liquid is pumped to a sewage desliming machine room 5 to be dehydrated; when the condensate in the separation tank is easy to settle, the condensate can be separated from the liquid by adopting a settling tank, and the sediment below the settling tank is pumped to the sewage desliming machine room 5 for dehydration.

The biochemical reaction tank 4 comprises an aeration tank and a secondary sedimentation tank, wherein activated sludge is arranged in the aeration tank, and the underflow of the secondary sedimentation tank is pumped to a sludge dewatering machine room 5. After the organic wastewater is aerated for a period of time, a tawny flocculating constituent which takes aerobic bacteria as a main body is generated in the water, wherein the tawny flocculating constituent contains a large amount of active microorganisms, the sludge flocculating constituent is active sludge which has loose structure and large surface area, has strong adsorption coagulation and oxidative decomposition capacity on organic pollutants, and the active sludge also has good self coagulation and sedimentation functions. In the aeration tank, the activated sludge is continuously cultured in the presence of dissolved oxygen, and the organic pollutants in the wastewater are purified by utilizing the adsorption, condensation and oxidative decomposition of the activated sludge, and then the activated sludge enters a secondary sedimentation tank for sedimentation.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a domestic wastewater treatment equipment, including the drain pipe network that sets gradually, a equalizing basin (1) for balanced water yield, a thoughtlessly congeal pond (2) for purifying inorganic matter, a separation tank (3) for solid-liquid separation, a biochemical reaction pond (4) for purifying organic matter and a sludge dewatering computer lab (5) that is used for the dehydration of solid-state separation thing, waste water passes through the drain pipe network in proper order, equalizing basin (1), thoughtlessly congeal pond (2), separation tank (3) and biochemical reaction pond (4), the aqueous slurry pump of separation tank (3) and biochemical reaction pond (4) separation is to sludge dewatering computer lab (5), a serial communication, thoughtlessly congeal pond (2) including three reaction tank (21), communicate between two adjacent reaction tank (21), support (22) have been set up to reaction tank (21) top, be provided with agitating unit on support (22), agitating unit includes motor (23), A bearing seat (24), a stirring shaft (25), a stirring impeller (26) and an auxiliary stirring sleeve (27); the bearing seat (24) is fixedly connected above the support (22), the stirring shaft (25) is vertically arranged, the upper end of the stirring shaft (25) is rotatably connected with the bearing seat (24), the lower end of the stirring shaft (25) is positioned in the reaction tank (21), the stirring impeller (26) is fixedly arranged at the lower end of the stirring shaft (25), and the motor (23) is arranged above the support (22) and used for driving the stirring shaft (25) to rotate; the auxiliary stirring sleeve (27) is a conical sleeve, the conical bottom surface faces downwards, the auxiliary stirring sleeve (27) is sleeved above the stirring impeller (26) and is fixedly connected with the reaction tank (21), the stirring impeller (26) comprises a wheel body (262) and a plurality of main blades (261), the main blades (261) are equidistantly arranged above the wheel body (262), the main blades (261) are perpendicular to the wheel body (262) and are fixedly connected with the wheel body (262), the main blades (261) are triangular, and the upper inclined surfaces of the main blades (261) are parallel to the conical surface of the auxiliary stirring sleeve (27) and are close to each other; a plurality of stirring blades (263) are uniformly and fixedly connected below the wheel body (262), and the stirring blades (263) and the wheel body (262) are arranged in an inclined manner along the circumferential direction.

2. The domestic wastewater treatment equipment according to claim 1, wherein the bottom of the reaction tank (21) is provided with an air source pipe (28) in communication.

3. The domestic wastewater treatment equipment according to claim 2, wherein the regulating reservoir (1) comprises a first regulating reservoir (11), a second regulating reservoir (12) and a third regulating reservoir (13) which are arranged in a step-like manner from high to low, wastewater of the drainage pipe network is discharged into the first regulating reservoir (11), the first regulating reservoir (11) overflows into the second regulating reservoir (12), and the second regulating reservoir (12) overflows into the third regulating reservoir (13).

4. The domestic wastewater treatment apparatus according to claim 3, wherein the number of the first conditioning tanks (11) is two or more and arranged side by side.

5. The domestic wastewater treatment apparatus according to claim 4, wherein the separation tank (3) is an air flotation tank.

6. The domestic wastewater treatment apparatus according to claim 4, wherein the separation tank (3) is a sedimentation tank.

7. The domestic wastewater treatment equipment according to claim 5 or 6, wherein the biochemical reaction tank (4) comprises an aeration tank and a secondary sedimentation tank, the aeration tank is filled with activated sludge, and the underflow of the secondary sedimentation tank is pumped to the sludge dewatering machine room (5).

8. The domestic wastewater treatment apparatus according to claim 1, wherein the wastewater from the sludge dewatering machine room (5) is pumped into the separation tank (3).