CN101172705A - A high-efficiency oxidation ditch sewage biological treatment method and system - Google Patents

Abstract

The invention discloses a high-efficient oxidation gouge sewage organism treating method and a system which comprise a ring shape oxidation gouge with at least two gouge paths, a low speed surface aerator, a water inlet and a water outlet. A partition is arranged between the adjacent gouge paths; the low speed aerator is arranged on the partition shared by the adjacent gouge paths of the oxidation gouge; the two sides of the partition out of the impeller of the aerator are respectively provided with an arc flow guiding board at the corresponding position; or the low speed surface aerator is arranged in the gouge paths of the oxidation gouge; at the same time, the side of the impeller of the aerator near the gouge path wall of the oxidation gouge is provided with a semicircular flow guiding board. The gouge path system of the oxidation gouge adopts the oxidation gouge formed by concentric circle walls with comparatively smaller resistance loss with big gouge path flowing speed, good mixing effect and no need of adding mixing apparatus; at the same time, the low speed surface aerator is adopted, and the aeration efficiency is high.

Description

A high-efficiency oxidation ditch sewage biological treatment method and system

technical field

The invention belongs to the field of sewage treatment, in particular to the technical field of sewage biological treatment oxidation ditch.

Background technique

Industrial wastewater and domestic sewage are discharged into natural water bodies, causing serious environmental pollution. Therefore, at present, sewage biological treatment technology is mainly used as the core method for treatment to reduce the content of organic matter and nutrient salts in sewage. Oxidation ditch sewage biological treatment technology is to oxidize, absorb or decompose organic matter and nutrient salts through activated sludge in an annular ditch. Dissolved oxygen is usually provided by aeration equipment, and at the same time, the fluid is pushed to flow in the channel, so that the sludge, sewage and dissolved oxygen are fully mixed to realize the biodegradation of sewage. In the usual sewage biological treatment system, the oxygenation and aeration system consumes a lot of energy and can provide good stirring and mixing ability. Oxidation ditch sewage biological treatment often adopts low-load design, and the oxygen demand per unit volume of aeration tank is small. Many oxidation ditch sewage biological treatment systems rely solely on aeration equipment to push flow, and the flow rate of sludge and sewage mixture in the ditch is low. , it is necessary to add additional streaming equipment, which will increase the energy consumption of the system. The low-speed surface aerator usually sucks the bottom fluid and sprays it through the rotating impeller to produce aeration and plug flow effects. Usually there is no low-speed zone at the bottom of the aerator; and the oxygenation efficiency is high, and it is often used in the Carrousel oxidation ditch. The Carrousel oxidation ditch adopts a semi-circular and rectangular tank body with a retaining wall structure to form a ring-shaped closed channel. The baffle itself also has a flow diversion function, so that the low-speed surface aerator not only aerates, but also plays a role in pushing flow. However, our research found that due to the small radius of the curve, the centrifugal force generated by the curve is large, so that the lateral circulation velocity generated by the centrifugal force of the curve is large, and the loss of resistance caused by the curve is large. It is often necessary to increase the push flow equipment to improve the oxidation of Carrousel. Groove flow and blending effects. The Orbal Oxidation Ditch is usually an annular channel formed by concentric circles or similar structures. The radius of the curve in the channel is relatively large and the resistance loss of the curve is ^small . The 6-meter-long rotary disc aerator has a power of about 7kw, which not only meets the aeration and oxygenation requirements in the ditch, but also has a push flow speed of 0.83m/s, which is far greater than the design requirement of the oxidation ditch (0.3m/s). However, the existing orbal oxidation ditch mainly adopts rotating disc or rotating brush aerators. The rotating brush and rotating disc aerators not only have low oxygenation efficiency, but also tend to produce low-speed zones under the rotating brush and rotating disc equipment, resulting in pollution. Mud deposition seriously affects the performance of oxidation ditch sewage biological treatment system.

Contents of the invention

The purpose of the present invention is to provide a high-efficiency oxidation ditch sewage biological treatment method and system. In the oxidation ditch formed by the annular wall and the bottom plate, the high-efficiency and low-speed surface aerator can meet the minimum requirements for aeration and oxygenation of the system. At the same time, it meets the requirements of fluid pushing and mixing in the channel.

Technical scheme of the present invention is as follows:

A high-efficiency oxidation ditch sewage biological treatment method is characterized in that an annular oxidation ditch including at least two channels is set, and a surface exposure device is installed on the partition wall shared by adjacent oxidation ditch channels or in the oxidation ditch channel. Aerator, install a semicircular deflector on the side of the impeller of the surface aerator close to the wall of the oxidation ditch, through the rotation of the impeller of the surface aerator, promote the circulation of sewage in the oxidation ditch, and complete the aerobic treatment process of sewage.

A high-efficiency oxidation ditch sewage biological treatment system, including an annular oxidation ditch with at least two channels, a surface aerator, a water inlet, and a water outlet, is characterized in that: the surface aerator is installed or the surface aerator is installed in the oxidation ditch, and at the same time, a semicircular deflector is installed on the side of the impeller of the surface aerator close to the wall of the oxidation ditch.

The high-efficiency oxidation ditch sewage biological treatment system is characterized in that two arc-shaped deflectors are installed outside the surface aerator installed on the partition wall shared by adjacent oxidation ditch channels.

The high-efficiency oxidation ditch sewage biological treatment system is characterized in that the height of the curved or semicircular deflector is greater than the height of the impeller of the aerator, and the upper part of the deflector is level with the water surface.

The high-efficiency oxidation ditch sewage biological treatment system is characterized in that the annular channel is three channels, wherein the innermost channel uses an underwater pusher to push the flow to form an anaerobic pool, and the middle channel And the outer channel constitutes an anaerobic-aerobic sewage biological treatment system with the function of phosphorus and nitrogen removal. Or configure a blast aeration system in the inner channel at the same time, or use a rotating brush or rotating plate to push flow aeration to form a three-channel aerobic aeration tank.

6. A high-efficiency oxidation ditch sewage biological treatment system as claimed in claim 2, characterized in that the surface aerator is installed on the partition wall shared by adjacent oxidation ditch channels, with a gap below it and no retaining wall.

The system of the present invention consists of three concentric walls or four concentric walls, a double-channel oxidation ditch or a three-channel oxidation ditch formed by the bottom wall, and a low-speed oxidation ditch is installed on the middle wall of the two channels For the surface aerator, when the impeller rotates clockwise, the water flow in the outer channel flows in a clockwise direction, and the water flow in the inner channel flows in a counterclockwise direction. When the low-speed surface aerator rotates counterclockwise, the water flow in the outer channel flows counterclockwise and the inner channel flows clockwise. Thereby not only aerating and oxygenating, but also promoting the water flow in the channel to complete the mixing function.

When the low-speed surface aerator is installed in the center of the channel, a semicircular deflector is installed around the aerator to make the water flow in one direction under the action of the deflector.

The low-speed surface aerator installed on the partition wall of the adjacent oxidation ditch has two 90-degree arc-shaped deflectors installed on the periphery of the aerator impeller, which are located at opposite positions on both sides of the partition wall to make the water flow away from the aeration When the machine is running, the flow direction is guided to the flow direction of the channel to increase the push flow effect.

The height of the curved or semicircular deflector is greater than the height of the impeller of the aerator, and the upper part of the deflector is level with the water surface.

When the annular channel is three channels, the innermost channel uses an underwater pusher to push flow to form an anaerobic pool, and forms an anaerobic pool with the middle channel and the outer channel with the functions of phosphorus and nitrogen removal. —Aerobic sewage biological treatment system. Or configure a blast aeration system in the inner channel at the same time, or use a rotating brush or rotating plate to push flow aeration to form a three-channel aerobic aeration tank.

The surface aerator is installed on the partition wall shared by adjacent oxidation ditch channels, with a gap below it and no retaining wall, which can reduce resistance.

The beneficial effects of the present invention are: the oxidation ditch channel system adopts the oxidation ditch formed by concentric circle walls with less resistance loss, the flow velocity of the channel is high, the mixing effect is good, no additional mixing equipment is needed, and a low-speed surface aerator is adopted at the same time, The aeration efficiency is high and the total energy consumption is reduced.

Description of drawings

Fig. 1 is a schematic diagram of an oxidation ditch structure without additional deflectors.

Fig. 2 is a schematic diagram of another oxidation ditch structure without additional deflectors.

Fig. 3 is a structural schematic diagram of the present invention.

Fig. 4 is a schematic diagram of another structure of the present invention.

Detailed ways

Embodiment 1: As shown in Figure 1, the annular oxidation ditch 4 and 5 surrounded by walls 1, 2 and 3, the low-speed surface aerator 6 is installed on the middle wall 2, and the mixed liquid of sewage and sludge passes through the water inlet 7 Enter the oxidation ditch 4, enter the oxidation ditch 5 through the aerator 6, and discharge through the water outlet 8. When the aerator is working, it rotates clockwise to provide dissolved oxygen, and at the same time pushes the water in the oxidation ditch 4 to flow clockwise. The water flows counterclockwise. Complete the sewage aerobic treatment process.

Embodiment 2: as shown in Figure 2, the ring-shaped oxidation ditch 4 and 5 that are surrounded by wall 1, 2 and 3, aerator 6 is installed in the middle of oxidation ditch 4 and 5, deflector 9 is equipped with on the periphery, sewage and The sludge mixture enters the oxidation ditch 4 through the water inlet 7, enters the oxidation ditch 5 through the hole 10 in the middle partition wall, and is sent out through the water outlet 8. When the aerator 6 is working, it rotates clockwise to provide dissolved oxygen and promote the oxidation ditch The water flow in 4 and 5 flows clockwise, and the sewage aerobic treatment process is completed in the oxidation ditch.

Example 3: As shown in Figure 3 and Figure 4, the ring-shaped oxidation ditch 4 and 5 surrounded by walls 1, 2 and 3, the aerator 6 is installed on the middle wall 2, and the mixed liquid of sewage and sludge passes through the water inlet 7 enters the oxidation ditch 4, enters the oxidation ditch 5 through the aerator 6, and sends out through the water outlet 8. When the aerator is working, it rotates clockwise to provide dissolved oxygen, and at the same time promotes the water flow in the oxidation ditch 5 to flow clockwise, and the oxidation ditch 4 The inner water flows counterclockwise. There are two 90-degree arc deflectors 11 and 12 installed around the aerator, which are respectively installed on the two oxidation ditch. The height of the deflector is equal to the height of the impeller of the aerator. level with the water. Add two so that when the water flow leaves the aerator, the flow direction is directed to the flow direction of the channel, increasing the effect of pushing flow. Complete the sewage aerobic treatment process.

Embodiment 4: as shown in Figure 4, the ring-shaped oxidation ditch 5,4 and 14 that is surrounded by wall 1,2,3 and 13, aerator 6 is installed on the middle wall 3, and sewage and sludge mixed liquor pass through The water port 7 enters the oxidation ditch 14, enters the oxidation ditch 4 through the aerator 6, enters the oxidation ditch 5 through the hole on the wall 2, and sends out through the water outlet 8. When the aerator 6 is working, it rotates clockwise to provide dissolved oxygen and push The water flow in the oxidation ditch 14 flows clockwise, and the water flow in the oxidation ditch 4 flows counterclockwise. An underwater thruster 15 is installed in the oxidation ditch 5 to push the water flow in the oxidation ditch. Complete the sewage aerobic treatment process.

Claims (6)

1. high-efficiency oxidation ditch biological sewage treatment method, it is characterized in that it being to be provided with to comprise the annular oxidation ditch that has two raceway grooves at least, on the total partition wall of adjacent oxidation ditch raceway groove or in the oxidation ditch raceway groove, surface aeration machine is installed, near oxidation ditch channel walls one side semicircle flow deflector is installed at the surface aeration machine impeller, by the surface aeration machine wheel rotation, the effluent cycle that promotes in the oxidation ditch flows, and finishes the sewage aerobic treating processes.

2. a high-efficiency oxidation ditch biological sewage treatment system comprises the annular oxidation ditch that has two raceway grooves at least, surface aeration machine, and water-in, water outlet is characterized in that: surface aeration machine is installed on the total partition wall of adjacent oxidation ditch raceway groove; Perhaps surface aeration machine is installed in the oxidation ditch raceway groove, near oxidation ditch channel walls one side semicircle flow deflector is installed at the surface aeration machine impeller simultaneously.

3. as a kind of high-efficiency oxidation ditch biological sewage treatment system as described in claims 2, it is characterized in that describedly being installed in that surface aeration machine on the total partition wall of adjacent oxidation ditch raceway groove is outer installs two arc deflectors.

4. as a kind of high-efficiency oxidation ditch biological sewage treatment system as described in claims 2 or 3, it is characterized in that described arc or semicircle flow deflector height greater than the aeration machine impeller height, flow deflector top is equal with the water surface.

5. as claims 2,3 or 4 described a kind of high-efficiency oxidation ditch biological sewage treatment systems, it is characterized in that described annular channel is a triple channel, wherein the most inboard raceway groove adopts impeller plug-flow under water, constitute anaerobic pond, constitute anaerobic-aerobic sewage biological treatment system with dephosphorization denitrogenation function with intermediate channel and outside raceway groove.Or in interior raceway groove, dispose blast aeration system simultaneously, and perhaps adopt and change brush or plate-spinning plug-flow aeration, constitute triple channel aerobic aeration pond.

6. as a kind of high-efficiency oxidation ditch biological sewage treatment system as described in claims 2, it is characterized in that being installed in the surface aeration machine on the total partition wall of adjacent oxidation ditch raceway groove, its below is a breach, no barricade.

Images