CN102424470A - Aeration disc and aeration device for treating river water pollution - Google Patents

Abstract

The invention discloses an aeration disc and an aeration device for treating river water pollution. When the aeration disc of the invention aerates the water body with oxygen, the gas diffuses around the aeration disc to form vortex, and meanwhile, convection occurs between the upper layer water body and the lower layer water body, so that the reoxygenation of the water body is accelerated, and the energy consumption is reduced.

Description

Aeration pan and aeration device for river water pollution control

technical field

The invention relates to an aeration device, in particular to an aeration pan and an aeration device for controlling river water pollution.

Background technique

Since Clark and Gage in the UK discovered in 1912 that long-term aeration of sewage would produce sludge and the water quality would be significantly improved, the activated sludge method has been closely linked with wastewater treatment. There are about 18,000 wastewater treatment plants in the United States, 84% of which are secondary biological treatment plants. There are about 3,000 treatment plants in the UK, almost all of which are secondary biological treatment plants. Japan has 630 urban wastewater treatment plants and 2,000 village wastewater treatment plants, of which secondary treatment plants and advanced treatment plants account for about 98%. Sweden has a population of less than 10 million, but there are 1,540 municipal wastewater treatment plants, 91% of which are secondary biological treatment plants. Among the secondary biological treatment processes commonly used in developed countries, the activated sludge method is the most widely used.

One of the basic elements of the activated sludge method is dissolved oxygen. Without sufficient dissolved oxygen, aerobic microorganisms cannot perform oxidative decomposition, and dissolved oxygen restricts the treatment effect of the activated sludge method. In a typical sewage treatment plant, the cost of aeration often accounts for 60-80% of the operating cost. The efficiency of traditional aeration equipment is too low, and the poor control of the operation of the aeration tank makes it difficult to reduce the energy consumption of aeration. And with the seasons and economic development in the service area, the composition of the influent water of sewage treatment plants has changed greatly. However, most of the current sewage treatment plants have not adjusted the aeration volume in response to changes in water quality, so that insufficient aeration will lead to effluent problems. The treatment effect is not good, and excessive aeration leads to waste of energy and waste of operating costs. Therefore, the quality of aeration control determines the treatment effect and operating energy consumption of the activated sludge process.

Analyze the factors that lead to the change of oxygen demand, find out the factors that affect the mass transfer of aeration oxygen, solve the change of oxygen demand caused by the change of influent water quality, control the dissolved oxygen in the optimal range that meets the biological needs, and use the minimum energy Consumption to meet the needs of biological activities. Develop high-efficiency and low-consumption aeration equipment, grasp the influence of different wastewater and operating conditions on oxygen mass transfer, adapt measures to local conditions, and automatically adjust the aeration volume according to the different influent water quality, so as to ensure the demand for dissolved oxygen and reduce energy consumption as much as possible. Energy consumption is one of the important research tasks of environmental work.

The basic physical and chemical model of activated sludge aeration is the three-phase flow model, which has three basic elements, one is the microorganisms that cause adsorption and oxidative decomposition, that is, activated sludge particles (solid phase); the other is the organic matter in wastewater and dissolved oxygen (liquid phase); the third is the main source of dissolved oxygen, microbubbles in water (gas phase). Without sufficient dissolved oxygen, aerobic microorganisms cannot perform aerobic oxidative decomposition. Therefore, an effective treatment process must fully contact microorganisms, organic matter and oxygen. Only in this way can the three-phase interaction be achieved to achieve the purpose of treating various organic matter. Therefore, while oxygenating, the activated sludge particles must be suspended. Oxygenation and mixing are achieved through aeration equipment.

The aerator has been promoted as an effective sewage treatment equipment. Its main function is to fill the sewage with air, and at the same time fully mix the solid, liquid, and gas phases. During the water cycle, the oxygen in the air Dissolve in water, fully contact and mix with organic matter and microorganisms, for the respiration of microorganisms, and oxidize organic matter, thereby improving the polluted ecological environment, purifying water quality, and creating an environment suitable for biological growth. At the same time, the electric energy of the sewage treatment plant is mainly consumed in the secondary biochemical treatment activated sludge aeration process. In various biochemical treatment processes, aeration technology is an indispensable link, and its quality not only affects sewage biochemical Treatment effect, and directly affect the operating cost of the sewage plant. Moreover, the secondary pollution caused by the aeration tank and its land occupation cannot be ignored. Therefore, how to improve the oxygen mass transfer efficiency in aeration, reduce the floor area of the aeration tank, and reduce secondary pollution has attracted the attention of relevant professionals.

Contents of the invention

The invention provides an aeration pan for controlling river water pollution. The aeration pan has a simple structure, can form a vortex in the surrounding water body, and has high oxygenation efficiency for the water body.

An aeration pan for river water pollution control, comprising a bracket, at least three annular hoses fixed on the bracket on the same plane, and an air pipe communicating with all the annular hoses, the annular hoses Aeration holes are arranged on the pipe wall.

The aeration holes are distributed in a linear honeycomb shape on the pipe wall of the annular hose.

All annular hoses are circular and arranged concentrically.

The support is a rice-shaped support composed of four support rods passing through the center of the annular hose.

The diameter of the aeration hole gradually decreases from the end close to the inner cavity of the annular hose to the outside, which can further prevent the sludge from pouring back and blocking the aeration hole.

The pore size of the aeration hole is less than 1mm, the air bubbles produced by the micropore aeration are small, the specific surface area is large, the air supply volume is variable and adjustable, and the oxygen dissolution efficiency is high, which can meet the activity consumption of a large number of high-density dominant bacteria. Oxygen demand, aeration efficiency increased to 5 times the original.

The wall thickness of the annular hose is 2-3 mm.

The present invention also provides an aeration device, comprising the above-mentioned aeration pan and a turbo blower, the air outlet of the turbo blower communicates with the air inlet end of the air delivery pipe.

When the aeration plate of the present invention aerates and oxygenates the water body, the gas diffuses to form a vortex around it, and at the same time convection occurs between the upper and lower water bodies, so that the reoxygenation of the water body is accelerated and the energy consumption is reduced.

The flexible hose of the present invention bulges during aeration, and the aeration holes open, and when it stops working, the aeration holes are closed due to hydrostatic pressure, so that it can be prevented from being blocked by sludge without using air filtering equipment, and the structure is simplified .

Description of drawings

Fig. 1 is the structural representation of aeration tray of the present invention;

Fig. 2 is the radial sectional view of flexible pipe in the device of the present invention;

Fig. 3 is a schematic structural view of the aeration device of the present invention.

Detailed ways

As shown in Figure 1, an aeration pan for river water pollution control includes a rice-shaped bracket 102 and six concentrically arranged annular hoses 101 fixed on the bracket 102, the annular hoses 101 are circular, and the tubes The wall is provided with aeration holes 104 distributed in a linear honeycomb shape, and also includes an air delivery pipe 103 communicating with all the annular hoses 101 , and the air delivery pipe 103 is arranged along the diameter direction of the annular hose 101 . The hose can be made of materials such as PE and PVC.

As shown in the radial section of the annular hose in Figure 2, the diameter of the aeration hole 104 gradually decreases from one end close to the inner cavity of the annular hose 101 to the outside, and the maximum diameter is not greater than 1 mm, and the wall thickness of the annular hose 101 It is 3mm, and can be adjusted to 2~3mm as needed.

As shown in Figure 3, a kind of aeration device that comprises above-mentioned aeration disc, it comprises aeration disc 1 and turbo blower 2, the air inlet end of air delivery pipe 103 communicates with the air outlet of turbo blower 2, and the turbo blower of this embodiment 2 is driven by a turbocharged engine with strong power.

When working, the turbo blower 2 sends high-pressure air to the aeration pan 1 through the air delivery pipe 103, the hose expands, and the aeration hole 104 is expanded, and the gas rushes out from the aeration hole 104 to form bubbles, and the diameter of the bubbles is between 1 and 3mm, the specific surface area is large, the air supply volume is variable and adjustable, and the aeration efficiency is also greatly improved.

After the air is flushed out from the aeration hole, due to the action of the ring hose 101, the water body around the aeration pan 1 forms a vortex, which enhances the convection of the upper and lower water bodies and increases the reoxygenation capacity of the water body.

Claims (8)

1. An aeration pan for river water pollution control, characterized in that it comprises a support, at least three ring-shaped flexible pipes fixed on the same plane and a gas delivery pipe communicated with all the ring-shaped flexible pipes. Aeration holes are arranged on the pipe wall of the above-mentioned annular hose. 2. The aeration pan according to claim 1, wherein the aeration holes are distributed in a linear honeycomb shape on the wall of the annular hose. 3. The aeration pan according to claim 1, wherein all the annular hoses are circular and arranged concentrically. 4. The aeration pan according to claim 3, wherein the bracket is a Pozi-shaped bracket composed of four bracket rods passing through the center of the annular hose. 5. The aeration pan according to claim 1, characterized in that, the diameter of the aeration hole gradually decreases from the end close to the inner cavity of the annular hose to the outside. 6. The aeration pan according to claim 1, characterized in that the diameter of the aeration holes is less than 1 mm. 7. The aeration pan according to claim 1, characterized in that, the wall thickness of the annular hose is 2-3mm. 8. An aeration device comprising the aeration pan according to claim 1, further comprising a turbo fan, the air outlet of the turbo fan communicates with the inlet end of the air delivery pipe.

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