CN113044967A

CN113044967A - Energy-saving and environment-friendly plug flow type aeration tank

Info

Publication number: CN113044967A
Application number: CN202110307969.3A
Authority: CN
Inventors: 王晓宁; 朱南文
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-06-29

Abstract

The invention relates to an energy-saving and environment-friendly plug flow type aeration tank, which comprises a tank body (1), wherein one end of the tank body (1) is provided with a water inlet (2), the other end of the tank body is provided with a water outlet (3), the bottom of the tank body (1) is provided with an aeration device (4), and the inner wall of one end of the tank body (1) close to the water outlet (3) is provided with a power generation device (5); sewage enters the tank body (1) from the water inlet (2), continuously rolls and flows under the action of the aeration device (4), and the purified water pushes the power generation device (5) to generate power and then is discharged from the water outlet (3). Compared with the prior art, the invention has the advantages that the water flow energy of the aeration tank is utilized, and the impeller is impacted by the water flow to rotate, so that the motor is driven to generate electricity, and the electricity is collected and stored in the storage equipment continuously. The novel energy-saving sewage treatment plant is simple in structure, easy to adjust and maintain, free of influences of seasons or weather factors and the like on generated energy, high in use stability and capable of being widely applied and popularized in various sewage treatment plants.

Description

Energy-saving and environment-friendly plug flow type aeration tank

Technical Field

The invention relates to the field of sewage treatment, in particular to an energy-saving and environment-friendly plug flow type aeration tank.

Background

Due to limited earth resources, the current environmental protection energy power generation modes adopted by people include solar power generation, hydroelectric power generation, wind power generation and the like, and are widely applied. The method is limited by the influence of factors such as the stability of power generation, huge construction engineering and the like, and the development and utilization of other simple and stable environment-friendly energy power generation modes are very important.

In the end of 2019, the accumulated sewage treatment plants in cities and counties in China reach 12893 seats, the daily treatment capacity is 22846 ten thousand tons, and the construction quantity and the treatment scale of the sewage treatment plants in China are continuously increased along with the economic development. The activated sludge process is a common process used in domestic and foreign sewage treatment plants. The aeration tank is a structure for sewage treatment by an activated sludge process. The aeration tank mainly comprises a tank body, an aeration system and a water inlet and a water outlet. The tank body is generally made of reinforced concrete, and the planar shape of the tank body is rectangular, square, circular and the like. Aeration tanks typically combine with settling tanks to form a combined process. The aeration tank is developed towards the direction of high efficiency, small volume and energy conservation.

Patent application CN201510070852.2 discloses a sewage treatment power generation method and device, which is characterized in that an oxygen-rich area is formed at the upper part of a sewage treatment structure or in an aeration tank through modes of blast aeration, mechanical aeration and the like, the oxidation-reduction potential is positive, an anoxic area is formed at the bottom of the structure or in a sedimentation tank, the oxidation-reduction potential is negative, electrodes are of a modular structure, and electric energy generated in the process of microbial oxidation-reduction action is collected by respectively arranging conductive layers in the oxygen-rich area and the anoxic area, wherein the electric potential between the two is the difference of the oxidation-reduction potentials. The device comprises vertical upflow shallow layer aeration sewage power generation, horizontal plug flow surface layer mechanical aeration power generation or power generation based on oxidation-reduction potential between an aeration tank and a sedimentation tank. The method and the device for the sewage treatment power generation device can promote the oxidation-reduction reaction, collect the electric energy of the sewage, and can be used as a sensor to monitor the aeration degree in real time, strengthen the nitrogen and phosphorus removal effect and improve the electro-adsorption removal of heavy metal ions in the water as a capacitor. However, the technology of the patent mainly utilizes a microbial oxidation-reduction mode to generate electricity, the application of the technology is greatly influenced by working conditions (pH and temperature), the impact resistance is weak, the requirement on microbial activity is high, the generated energy is unstable, and the energy recovery efficiency is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an energy-saving and environment-friendly plug flow type aeration tank.

The purpose of the invention can be realized by the following technical scheme: an energy-saving and environment-friendly plug flow type aeration tank comprises a tank body, wherein one end of the tank body is provided with a water inlet, the other end of the tank body is provided with a water outlet, the bottom of the tank body is provided with an aeration device, and the inner wall of the tank body, which is close to one end of the water outlet, is provided with a power generation device; sewage enters the tank body from the water inlet, continuously rolls and flows under the action of the aeration device, and the purified water pushes the power generation device to generate power and then is discharged from the water outlet.

The power generation device comprises a slide rail, a vertical rod, a connecting shaft, an impeller, a power generator and a transmission device, wherein the slide rail is longitudinally arranged on the inner wall of the pool body at one end close to the water outlet; the vertical rods are detachably inserted into the corresponding sliding rails; the transmission device is arranged on the slide rail and connected with the vertical rod; the connecting shaft is vertically connected with a pair of vertical rods, is used for fixing the impeller and the generator and can be driven by a transmission device to move up and down to adjust the height; the impeller is connected with a rotating shaft of the generator, and the generator is connected with the outside through a lead.

The connecting shaft is of a hollow rod-shaped structure, and a lead of the generator leading to the outside can be placed inside the connecting shaft.

A plurality of pairs of vertical rods are arranged in the same tank body, and each pair of vertical rods are arranged in parallel along the water flow direction and the number of the vertical rods is not more than 3.

A plurality of connecting shafts parallel to the liquid level are arranged in the same pair of vertical rods, the connecting shafts are arranged in parallel up and down, and the distance between the connecting shaft at the bottommost part and the bottom of the tank body is not less than 50 cm.

A plurality of groups of impellers are arranged on the same connecting shaft, and each group of impellers is connected with a generator or a plurality of groups of impellers are connected with the same generator; the impellers on the same pair of vertical rods are arranged in the same direction.

4-6 spiral curved surface blades are uniformly arranged on the impeller, and the spiral angle is 10-30 degrees, so that the blades have larger water receiving and energy collecting area, and the blades can be pushed to rotate under the condition of smaller water flow; the surface of the blade is treated by a ceramic film, so that the corrosion caused by long-term frequent water flow impact is reduced, and the service life is prolonged.

The water inlet is arranged below the water surface and discharges water in a submerged mode so as to avoid short flow; the water outlet is provided with an overflow weir, and the effluent supernatant treated by the activated sludge process uniformly overflows the weir top and flows into a drainage channel; through the mounting height of adjusting the montant, make the impeller be located the surface of water, flow from water inlet one end when sewage, under the promotion of follow-up rivers, along the length of cell body to when flowing out from the other end delivery port, promote the blade of impeller and take place to rotate, drive the pivot rotation of generator, produce the electric energy with the water kinetic energy conversion.

The transmission device is connected with the upper end of the vertical rod.

Compared with the prior art, the sewage in the aeration tank of the sewage treatment plant flows continuously, and the flowing energy of the water is used for power generation and recovery, so that continuous energy can be obtained and can be used as effective supplement of the electric energy required by the sewage treatment plant; the system and the using method have simple structure, are easy to adjust and maintain, are not influenced by seasons, climatic factors and the like on the generated energy, have high use stability, and can be widely applied and popularized in various sewage treatment plants.

Drawings

FIG. 1 is a schematic structural view of a plug-flow aeration tank in example 1 of the present invention;

FIG. 2 is a schematic structural view of an oxidation trench according to example 2 of the present invention;

fig. 3 is a schematic structural view of an impeller fixed to a connecting shaft.

In the figure: 1. a tank body; 2. a water inlet; 3. a water outlet; 4. an aeration device; 5. a power generation device; 5-1, sliding rails; 5-2, a vertical rod; 5-3, a connecting shaft; 5-4, an impeller; 5-5, a power generator; 5-6, a transmission device; 6. a sludge discharge port; 7. and a flow blocking wall.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

As shown in fig. 1, the energy-saving and environment-friendly plug-flow aeration tank comprises a tank body 1, a water inlet 2, a water outlet 3, an aeration device 4 and a power generation device 5, wherein the power generation device 5 comprises a slide rail 5-1, a vertical rod 5-2, a connecting shaft 5-3, an impeller 5-4, a power generator 5-5 and a transmission device 5-6, and the slide rail 5-1 is longitudinally arranged on the inner wall of the tank body 1 at one end close to the water outlet 3; the vertical rods 5-2 are detachably inserted into the corresponding slide rails; the transmission device 5-6 is arranged on the sliding rail 5-1 and is connected with the upper end of the vertical rod 5-2; the connecting shaft 5-3 is vertically connected with a pair of vertical rods 5-2, is used for fixing the impeller 5-4 and the generator 5-5, and can be driven by a transmission device 5-6 to move up and down to adjust the height.

The impeller 5-4 is connected with a rotating shaft of the power generator 5-5, and the power generator 5-5 is connected with the outside through a lead; the connecting shaft 5-3 is a hollow rod-shaped structure, and a lead of the generator 5-5 leading to the outside can be placed inside the connecting shaft.

A plurality of pairs of vertical rods 5-2 can be arranged in the same tank body 1, a plurality of connecting shafts 5-3 can be arranged in the same pair of vertical rods 5-2, in the embodiment, 1 pair of vertical rods are arranged in the tank body, 2 connecting shafts which are arranged in parallel up and down are arranged on the vertical rods, and the distance between the connecting shaft 5-3 at the bottommost part and the bottom of the tank body 1 is 50 cm.

A plurality of groups of impellers 5-4 can be arranged on the same connecting shaft 5-3, in the embodiment, 2 groups of impellers are arranged on each connecting shaft, and each group of impellers 5-4 is connected with a generator 5-5; the impellers 5-4 on the same pair of vertical rods 5-2 are arranged in the same direction.

4 spiral curved surface blades are uniformly arranged on the impeller 5-4, and the spiral angle is 20 degrees, so that the energy of water flow is gathered, and the blades can be pushed to rotate under the condition of low flow speed of the water flow; the surface of the blade is treated by a ceramic film, so that the corrosion caused by long-term frequent water flow impact is reduced, and the service life is prolonged.

The water inlet 2 is arranged below the water surface and discharges water in a submerged mode so as to avoid short flow; the water outlet 3 is provided with an overflow weir, and effluent supernatant treated by an activated sludge method uniformly overflows the weir top and flows into a drainage channel; the impeller 5-4 is positioned under the water surface by adjusting the mounting height of the vertical rod 5-2, and when sewage flows in from one end of the water inlet 2, flows along the length of the tank body 1 under the push of subsequent water flow and flows out from the water outlet 3 at the other end, the impeller 5-4 is pushed to rotate to generate electric energy.

Referring to FIG. 1, the apparatus of example 1 was used for treating domestic sewage containing COD 500mg/L, TN 50mg/L and SS200mg/L, and the flow rate of water in the aeration tank was 0.4m/s and the diameter of the impeller 5-4 was 50 cm. Because the tank body is a plug flow type aeration tank, sewage flows along the length direction of the tank body under the push of subsequent water flow after entering from the water inlet 2 and is purified in the tank body through the aeration device, and the purified water is discharged from the water outlet 3. Because set up power generation facility 5 before delivery port 3, water promotes power generation facility and constantly generates electricity, because power generation facility 5 has adopted the rotatory mode of multiunit impeller, on the one hand improves and to utilize the energy resource electricity generation comprehensively, on the other hand has increaseed the turbulent degree of water because the rotation of multiunit impeller and aeration equipment's synergism, has improved the gaseous utilization ratio of aquatic, has further improved the purifying effect of water in the pond. In the embodiment, the sewage power generation voltage is 8-11V, the current is 0.06-0.23A, the COD removal rate of the effluent is 75%, the TN removal rate is 50% and the SS removal rate is 70%.

Example 2

As shown in fig. 2, the aeration device 4 of the energy-saving and environment-friendly plug-flow aeration tank provided by the invention adopts a mechanical aeration facility and is arranged on the surface water surface close to the water inlet 2 in the tank body 1; the bottom of the tank body 1 is provided with a sludge discharge port 6 for collecting sludge; one side of the tank body 1 close to the water inlet 2 is provided with a flow baffle wall 7 for guiding and lifting the inflow water to the area near the aeration device 4, and simultaneously, silt and large-particle sludge carried by the inflow water are precipitated and separated to a bottom sludge discharge port 6. The vertical distance between the bottom of the flow baffle wall 7 and the bottom of the tank body 1 is 0.5 m. The same power generation device 5 and using mode as those of the embodiment 1 are adopted to treat domestic sewage containing 540mg/L COD, 60mg/L TN and 220mg/L SS, the water flow speed in the aeration tank is 0.5m/s, the power generation voltage of the sewage is 10-14V, the current is 0.07-0.28A, the effluent quality is not influenced by the installation of the aeration device 4, and the removal rate is 72 percent COD, 55 percent TN and 75 percent SS.

Example 3

Two pairs of vertical rods 5-2 are arranged in parallel in the direction of water flow in the tank body 1, the distance between the two pairs of vertical rods is 1m, other installation modes, operation conditions and the quality of sewage are consistent with those of the embodiment 1, the power generation voltage of the sewage is 11-17V, the current is 0.1-0.41A, the COD removal rate, TN removal rate and SS removal rate of effluent quality are 76%, 50% and 70%.

Comparative example

The structure of the plug-flow aeration tank was the same as that of example 3, but the power generation device was not provided in the plug-flow aeration tank. When domestic sewage with the same quality as that of the domestic sewage in the examples 1 and 3 is treated, the removal rate of COD in the effluent of the aeration tank is 70%, and the removal rates of TN and SS are not changed greatly compared with the removal rate of the domestic sewage in the example 3.

Tests show that the invention not only can generate electricity, but also can assist in reducing the concentration of organic pollutants in sewage and improving the water quality purification effect. The device of the invention can not be influenced by seasons, climatic factors and the like on the generated energy, and can be suitable for various sewage treatments, in particular to urban domestic drainage treatment facilities such as aeration tanks, oxidation ditches and the like.

It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation. The technical solutions and inventive concepts according to the present invention should be equally replaced or changed within the technical scope of the present invention.

Claims

1. An energy-saving and environment-friendly plug flow type aeration tank comprises a tank body (1), wherein one end of the tank body (1) is provided with a water inlet (2), the other end of the tank body is provided with a water outlet (3), and the bottom of the tank body (1) is provided with an aeration device (4), and is characterized in that a power generation device (5) is arranged on the inner wall of the tank body (1) close to one end of the water outlet (3); sewage enters the tank body (1) from the water inlet (2), continuously rolls and flows under the action of the aeration device (4), and the purified water pushes the power generation device (5) to generate power and then is discharged from the water outlet (3).

2. The energy-saving and environment-friendly plug flow aeration tank as defined in claim 1, wherein the power generation device (5) comprises slide rails (5-1), vertical rods (5-2), connecting shafts (5-3), impellers (5-4), power generators (5-5) and transmission devices (5-6), the slide rails (5-1) are longitudinally installed on the inner wall of the tank body (1) at one end close to the water outlet (3), the vertical rods (5-2) are detachably inserted into the corresponding slide rails (5-1), and the transmission devices (5-6) are arranged on the slide rails (5-1) and connected with the vertical rods (5-2); the connecting shaft (5-3) is vertically connected with a pair of vertical rods (5-2) and used for fixing the impeller (5-4) and the generator (5-5) and is driven by the transmission device (5-6) to move up and down to adjust the height; the impeller (5-4) is connected with a rotating shaft of the generator (5-5), and the generator (5-5) is connected with the outside through a lead.

3. The energy-saving and environment-friendly plug-flow aeration tank as claimed in claim 2, wherein the connecting shaft (5-3) is a hollow rod-shaped structure, and wires for leading the power generator (5-5) to the outside are arranged inside the connecting shaft.

4. The energy-saving and environment-friendly plug-flow aeration tank as defined in claim 2, wherein a plurality of pairs of vertical rods (5-2) are provided in the same tank body (1), and each pair of vertical rods are arranged in parallel along the water flow direction and the number of the vertical rods is not more than 3 pairs.

5. The energy-saving and environment-friendly plug-flow aeration tank as defined in claim 4, wherein a plurality of connecting shafts (5-3) parallel to the liquid level are arranged in the same pair of vertical rods (5-2), the connecting shafts (5-3) are arranged in parallel up and down, and the distance between the connecting shaft (5-3) at the bottommost part and the bottom of the tank body (1) is not less than 50 cm.

6. The energy-saving and environment-friendly plug-flow aeration tank according to claim 2, 3, 4 or 5, wherein a plurality of groups of impellers (5-4) are arranged on the same connecting shaft (5-3), each group of impellers (5-4) is connected with one power generator (5-5) or a plurality of groups of impellers (5-4) are connected with the same power generator (5-5); the impellers (5-4) on the same pair of vertical rods (5-2) are arranged in the same direction.

7. The energy-saving and environment-friendly plug-flow aeration tank as claimed in claim 6, wherein 4-6 spiral curved surface blades are uniformly arranged on the impeller (5-4), and the spiral angle is 10-30 °.

8. The energy-saving and environment-friendly plug flow aeration tank as claimed in claim 7, wherein the surfaces of the blades are coated with ceramic films.

9. The energy-saving and environment-friendly plug-flow aeration tank as claimed in claim 1, wherein the water inlet (2) is arranged below the water surface and flows out in a submerged manner; the water outlet (3) is provided with an overflow weir; the blades of the impeller (5-4) rotate under the water surface by adjusting the mounting height of the vertical rod (5-2).

10. The energy-saving and environment-friendly plug-flow aeration tank as claimed in claim 2, wherein the transmission device (5-6) is connected with the upper end of the vertical rod (5-2).