Stacked self-phase heat exchange type anaerobic-aerobic-anoxic combined reactor

Abstract

The invention discloses a nested self-phase heat exchange type anaerobic-aerobic-anoxic combined reactor which comprises an anaerobic reactor, an anoxic reactor and an aerobic reactor, the anaerobic reactor is located at the center of the reactor, the aerobic reactor sleeves the surface of the anaerobic reactor, the anoxic reactor sleeves the surface of the aerobic reactor, and the anoxic reactor sleeves the surface of the aerobic reactor. And the surface of the anaerobic reactor is fixedly sleeved with a thermal insulation layer. The sewage treatment equipment has the advantages of energy conservation and environmental protection, and solves the problems that in the using process of existing sewage treatment equipment, heat energy of an aerobic reactor is inconvenient to recycle and is used for heating an anaerobic system, energy waste is easily caused, and the environmental protection property of the sewage treatment equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-concentration organic wastewater treatment, in particular to a stacked self-phase heat exchange anaerobic, aerobic and anoxic combined reactor. Background Art

[0002] High-concentration organic wastewater refers to a type of wastewater with high organic matter concentration, complex composition, and large differences in biodegradability. It is commonly found in the pharmaceutical, chemical, food, printing and dyeing industries, as well as in landfills, waste incineration plants, and food waste treatment stations. Its treatment process needs to be selected according to the characteristics of the wastewater.

[0003] Taking the leachate from municipal solid waste incineration plants as an example, the conventional processes of its treatment system generally include pretreatment, main treatment, deep treatment and auxiliary treatment, while anaerobic biological treatment and membrane bioreactor systems are the pretreatment and main treatment equipment in the sewage treatment process respectively. Among them, anaerobic reactors mostly choose upflow anaerobic sludge blanket, upflow sludge blanket filter, internal circulation anaerobic reactor and its improved process, and membrane bioreactors generally include anoxic reactors, aerobic reactors, ultrafiltration membrane components and aeration systems.

[0004] In order to improve the treatment effect, anaerobic treatment generally adopts medium-temperature anaerobic process, so the anaerobic biological treatment system must also be equipped with a heating system to heat the system in winter, spring and autumn to maintain the optimal temperature required by the system, which is 33-38℃.

[0005] Because the aerobic reaction of the membrane bioreactor is an exothermic reaction, when the inlet water temperature is greater than 20°C, the heat generated by the aerobic reaction, the heat brought in by the compressed hot air in the aeration system, and the mechanical energy input by various pumps will cause the temperature in the anoxic and aerobic reactors to exceed 35°C, thereby inhibiting the activity of nitrifying bacteria. For this reason, the membrane bioreactor must also be equipped with a cooling device to cool the activated sludge in the reactor when the reactor temperature is greater than 35°C.

[0006] To sum up, anaerobic biological treatment requires heating, while aerobic systems require cooling. Both have independent heating and cooling systems, and both consume heat and electricity. How to recover the heat energy of the aerobic reactor and use it for heating the anaerobic system is a problem that needs to be urgently solved in the current high-concentration organic wastewater treatment system. Summary of the Invention

[0007] The purpose of the present invention is to provide a stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor, which has the advantages of energy saving and environmental protection, and solves the problem that during the use of existing sewage treatment equipment, it is inconvenient to recover the heat energy of the aerobic reactor and use it for heating the anaerobic system, which easily leads to energy waste and reduces the environmental protection of the sewage treatment equipment.

[0008] To achieve the above object, the present invention provides the following technical solution: a stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor, comprising an anaerobic reactor, an anoxic reactor and an aerobic reactor.

[0009] The anaerobic reactor is located at the center of the reactor, the aerobic reactor is sleeved on the surface of the anaerobic reactor, the anoxic reactor is sleeved on the surface of the aerobic reactor, and the surface of the anoxic reactor is fixedly sleeved with a thermal insulation layer;

[0010] The aerobic reactor transfers heat to the anaerobic reactor through the tank wall, and the two conduct self-heat exchange.

[0011] As a preferred embodiment of the stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor of the present invention, the aerobic reactor is connected to a cooling device.

[0012] As a preferred stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor of the present invention, a jet aeration device is arranged at the bottom of the aerobic reactor, and an air inlet end of the jet aeration device is connected to an air source and a power water flow.

[0013] As a preferred embodiment of the stacked self-heat-exchange anaerobic, aerobic and anoxic combined reactor of the present invention, the output end of the aerobic reactor is connected to an ultrafiltration membrane assembly.

[0014] As a preferred stacked self-heat exchange anaerobic aerobic anoxic combined reactor of the present invention, a tangential water distribution system is installed at the bottom of the anaerobic reactor, a tubular one-way jet aerator is installed at the bottom of the aerobic reactor, and a flow-pushing device is installed at the bottom of the anoxic reactor. The flow-pushing device is a mechanical flow-pushing device or a jet flow-pushing device.

[0015] As a preferred stacked self-heat exchange anaerobic aerobic anoxic combination reactor of the present invention, the water distribution direction of the anaerobic reactor, the jet aeration direction of the aerobic reactor and the plug flow direction of the anoxic reactor are opposite to each other. For example, when the water distribution direction of the anaerobic reactor is counterclockwise, the jet aeration direction of the aerobic reactor is clockwise, and the plug flow direction of the anoxic reactor is counterclockwise.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention eliminates the need for a heating device for the anaerobic reactor through self-heat exchange between the aerobic reactor and the anaerobic reactor, saving equipment investment and processing costs. It also reduces the operating time of the cooling device supporting the aerobic reactor, thereby further saving processing costs. The co-wall design of the anaerobic reactor, the anoxic reactor and the aerobic reactor, which are nested with each other, improves integration and reduces construction investment.

[0018] 2. During the self-phase heat exchange process of the present invention, when the temperature is low in winter, spring, and autumn, the aerobic reactor heats the anaerobic sludge in the anaerobic reactor while also completely cooling its own aerobic sludge, so that the temperature in the anaerobic reactor is maintained above 33°C and the temperature in the aerobic reactor is maintained below 35°C. There is no need to heat the anaerobic reactor separately, nor is there any need to cool the aerobic reactor separately. When the temperature is high in summer, there is excess heat in the aerobic reactor after heating the anaerobic reactor, so the cooling device supporting the aerobic reactor operates intermittently to maintain appropriate operating temperatures for the anaerobic and aerobic reactors, thereby reducing energy consumption and improving the environmental friendliness of the sewage treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a process flow chart of the present invention;

[0020] Figure 2 This is a process flow chart for conventional high-concentration organic wastewater treatment;

[0021] Figure 3 Schematic diagram of the structure of the present invention Figure 1 ;

[0022] Figure 4 Schematic diagram of the structure of the present invention Figure 2 .

[0023] In the figure: 1. Anaerobic reactor; 2. Anoxic reactor; 3. Aerobic reactor; 4. Ultrafiltration membrane assembly; 5. Tangential water distribution system; 6. Cooling device; 7. Aeration device; 8. Shell and tube one-way jet aerator; 9. Flow-pushing device; 10. Insulation layer. DETAILED DESCRIPTION

[0024] See also Figure 1-Figure 4 A stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor comprises an anaerobic reactor 1, an anoxic reactor 2 and an aerobic reactor 3.

[0025] Furthermore, the anaerobic reactor 1 is located at the center of the reactor, the aerobic reactor 3 is sleeved on the surface of the anaerobic reactor 1, the anoxic reactor 2 is sleeved on the surface of the aerobic reactor 3, and the surface of the anoxic reactor 3 is fixedly sleeved with an insulation layer 10;

[0026] Furthermore, the aerobic reactor 3 transfers heat to the anaerobic reactor 1 through the tank wall, and the two perform self-heat exchange.

[0027] Furthermore, the air inlet end of the aerobic reactor 3 is connected to a jet aeration device 7, and the aeration device 7 is connected to an air source and a power water flow.

[0028] Furthermore, the output end of the aerobic reactor 3 is connected to an ultrafiltration membrane assembly 4 .

[0029] Furthermore, the aerobic reactor 3 is connected to a cooling device 6 .

[0030] Furthermore, a tangential water distribution system 5 is installed at the bottom of the anaerobic reactor 1, a tubular one-way jet aerator 8 is installed at the bottom of the aerobic reactor 3, and a flow-pushing device 9 is installed at the bottom of the anoxic reactor 2. The flow-pushing device 9 is a mechanical flow-pushing device or a jet flow-pushing device.

[0031] Furthermore, the water distribution direction of the anaerobic reactor 1, the jet aeration direction of the aerobic reactor 3, and the plug flow direction of the anoxic reactor 2 are opposite to each other. When the water distribution direction of the anaerobic reactor 1 is counterclockwise, the jet aeration direction of the aerobic reactor 3 is clockwise, and the plug flow direction of the anoxic reactor 2 is counterclockwise.

[0032] During operation, raw water enters the central anaerobic reactor 1 through the tangential water distribution system 5, creating a swirling flow that enhances solid-liquid mixing. The aerobic reactor 3 transfers heat to the anaerobic reactor 1 through the tank wall for self-heat exchange. The waste heat from the aerobic zone maintains a mesophilic anaerobic environment at 35-38°C. The hydrolytic and acidifying bacteria decompose large organic molecules into small molecules, simultaneously releasing phosphate and performing partial denitrification pretreatment. The anaerobic-treated mixed liquid enters the anoxic reactor 2, where it refluxes with the nitrified liquid from the aerobic zone to achieve denitrification. The mixed liquid then enters the aerobic reactor 3, where a shell-and-tube jet aerator generates micro-nano bubbles, enhancing gas-liquid contact efficiency through water flow. Nitrifying bacteria complete ammonia nitrogen conversion here, while heterotrophic bacteria degrade the remaining organic matter. Temperature sensors monitor the temperatures of the anaerobic reactor 1 and aerobic reactor 3 in real time. When the temperature exceeds 45°C, the cooling mode is switched to rapid cooling via the cooling device 6 to ensure microbial activity. The treated mixed liquid passes through the ultrafiltration membrane assembly 4 for solid-liquid separation, and the retained activated sludge is returned to the anoxic zone via the air stripping device.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stacked self-heat exchange anaerobic aerobic anoxic combined reactor, comprising an anaerobic reactor (1), an anoxic reactor (2) and an aerobic reactor (3), characterized in that: The anaerobic reactor (1) is located at the center of the reactor, the aerobic reactor (3) is sleeved on the surface of the anaerobic reactor (1), the anoxic reactor (2) is sleeved on the surface of the aerobic reactor (3), and the surface of the anoxic reactor (2) is fixedly sleeved with a thermal insulation layer (10); The aerobic reactor (3) transfers heat to the anaerobic reactor (1) through the tank wall, and the two conduct self-phase heat exchange.

2. The stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor according to claim 1, characterized in that: The aerobic reactor (3) is connected to a cooling device (6).

3. The stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor according to claim 2, characterized in that: A tubular one-way jet aeration device (7) is arranged at the bottom of the aerobic reactor (3), and an air inlet end of the jet aeration device (7) is connected to an air source and a power water flow.

4. The stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor according to claim 3, characterized in that: The output end of the aerobic reactor (3) is connected to an ultrafiltration membrane assembly (4).

5. The stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor according to claim 4, characterized in that: The bottom of the anaerobic reactor (1) is equipped with a tangential water distribution system (5), the bottom of the aerobic reactor (3) is equipped with a tubular one-way jet aerator (8), and the bottom of the anoxic reactor (2) is equipped with a flow-pushing device (9), which is a mechanical flow-pushing device or a jet flow-pushing device.

6. The stacked self-heat-exchanging anaerobic, aerobic and anoxic combined reactor according to claim 5, characterized in that: The water distribution direction of the anaerobic reactor (1), the jet aeration direction of the aerobic reactor (3), and the plug flow direction of the anoxic reactor (2) are opposite to each other. When the water distribution direction of the anaerobic reactor (1) is counterclockwise, the jet aeration direction of the aerobic reactor (3) is clockwise, and the plug flow direction of the anoxic reactor (2) is counterclockwise.

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