A high-load biological pretreatment device and its use method

Abstract

The present application relates to the field of sewage treatment, and in particular to a high-load biological pretreatment device and a method for using the same. The device comprises a tank body, a jet aerator is arranged inside the tank body, an air supply pipe is arranged on the top of the jet aerator, the other end of the air supply pipe extends to the outside of the tank body and is connected to an aeration fan, the other end of the bypass sewage pipe is connected to the surface of the air supply pipe, one end of the No. 1 return pipe is connected to the bottom of the jet aerator, the other end of the No. 1 return pipe extends to the outside of the tank body and is connected to a circulation pump; compared with the existing high-efficiency aeration tank or high-load aeration tank, the sedimentation tank is eliminated and a stirring function is configured, and a set of automatic control program methods can realize automatic conversion of four operating conditions of aeration, stirring, sedimentation, and sludge discharge, realizing the integration of biological reaction and sedimentation, and the tank body is equipped with a DO online monitoring instrument, a PH online monitoring instrument, an ORP online monitoring instrument, and a temperature online instrument to detect various indicators of the tank body, thereby guiding the safe and stable operation of the pretreatment device.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a high-load biological pretreatment device and a method for using the same. Background Art

[0002] Kitchen organic slurry has water quality characteristics such as high COD, high SS, high oil content, and high viscosity. Existing physical and chemical treatment technologies such as coagulation and sedimentation or flotation processes have low efficiency in removing COD and SS, require very large amounts of reagents, and have high operating costs. At the same time, they have weak resistance to water quality and water volume shock loads. Existing biological treatment technologies such as anaerobic processes have good COD removal effects, but anaerobic processes require heating devices, and the biogas produced by anaerobic processes requires a series of biogas treatment facilities. The entire treatment system is very complex, the project investment is relatively high, and the biogas poses huge safety risks, and the operation and maintenance requirements are high and difficult.

[0003] Existing high-efficiency aeration tanks or high-load aeration tanks do not have a stirring function, and the water quality and quantity of food waste organic slurry often vary greatly. In actual operation, there is a difference between the air supply and the air demand, which is difficult to adjust in time. This can easily cause the DO concentration to be too high, destroying the living environment of organisms and affecting the treatment effect. In addition, the effluent from high-efficiency aeration tanks or high-load aeration tanks usually requires a sedimentation tank, which makes the system complex and the engineering investment relatively large. Utility Model Content

[0004] The present application provides a high-load biological pretreatment device and a method for using the same to address the technical issues identified by the inventors, such as the lack of agitation in existing high-efficiency aeration tanks or high-load aeration tanks, the significant variations in water quality and quantity of food waste organic slurry, the discrepancy between air supply and air demand during actual operation, and the difficulty in timely adjustment. This can easily lead to excessively high DO concentrations, which damage the biological living environment and affect the treatment effect. Furthermore, the effluent from high-efficiency aeration tanks or high-load aeration tanks usually requires a sedimentation tank, resulting in a complex system and relatively high engineering investment.

[0005] The present application provides a high-load biological pretreatment device, including a tank body, a jet aerator is provided inside the tank body, an air supply pipe is provided on the top of the jet aerator, the other end of the air supply pipe extends to the outside of the tank body and is connected to an aeration fan, a bypass sewage pipe is provided inside the tank body, the other end of the bypass sewage pipe is connected to the surface of the air supply pipe, and further includes a No. 1 return pipe, one end of the No. 1 return pipe is connected to the bottom of the jet aerator, the other end of the No. 1 return pipe extends to the outside of the tank body and is connected to a circulation pump, The input end of the circulation pump is connected to the No. 2 return pipe, the other end of the No. 2 return pipe is communicated with the inner cavity of the tank body, and the interior of the tank body is provided with a water inlet pipe, a water outlet pipe, a sludge return pipe and a sludge discharge pipe, and the other ends of the water inlet pipe, the water outlet pipe, the sludge return pipe and the sludge discharge pipe all extend to the outside of the tank body; a No. 1 valve is provided on the surface of the air supply pipe and located outside the tank body, a No. 2 valve is provided on the surface of the bypass sewage pipe and located inside the tank body, and a No. 3 valve is provided on the surface of the sludge discharge pipe and located outside the tank body.

[0006] In any of the above technical solutions, further, a water outlet weir is provided inside the tank body, and one end of the water outlet pipe is located in the water outlet space restricted by the water outlet weir and the tank body.

[0007] In any of the above technical solutions, further, there is a height difference between the water inlet pipe and the water outlet pipe, and the height of the water outlet pipe is higher than the height of the water inlet pipe.

[0008] In any of the above technical solutions, further, the plane angle between the outlet pipe and the water inlet pipe is at least ninety degrees; the plane angle between the sludge return pipe and the water inlet pipe is less than ninety degrees; the plane angle between the mud discharge pipe and the water inlet pipe is at least one hundred and thirty-five degrees, and the plane angle between the mud discharge pipe and the sludge return pipe is at least ninety degrees.

[0009] In any of the above technical solutions, further, the valve No. 1, the valve No. 2 and the valve No. 3 are electric valves, pneumatic valves or manual valves; the tank body is an enamel assembled tank, an epoxy assembled tank, a stainless steel assembled tank or a concrete cast-in-place tank body.

[0010] In any of the above technical solutions, further, an ORP online monitoring instrument is provided inside the tank body, and the ORP online monitoring instrument is used to monitor the redox potential inside the tank body in real time.

[0011] In any of the above technical solutions, further, a DO online monitoring instrument is provided inside the tank body, and the DO online monitoring instrument is used to monitor the dissolved oxygen concentration in the tank body in real time.

[0012] In any of the above technical solutions, further, a pH online monitoring instrument is provided inside the tank body, and the pH online monitoring instrument is used to monitor the pH value inside the tank body in real time.

[0013] In any of the above technical solutions, further, a temperature online monitoring instrument is provided inside the tank body, and the temperature online monitoring instrument is used to monitor the temperature of the sewage in the tank body in real time.

[0014] The present application provides a method for using a high-load biological pretreatment device, comprising the following steps:

[0015] Sewage always enters the tank through the water inlet pipe, sewage in the tank always flows out through the water outlet pipe, and sludge always flows back through the sludge return pipe;

[0016] Perform an aeration operation in advance by first closing the No. 2 valve on the bypass sewage pipe; then sequentially opening the No. 1 valve on the air supply pipe, the circulation pump, and the aeration fan, and the gas generated by the aeration fan supplies air to the jet aerator through the air supply pipe, and finally the gas flows out through the jet aerator, while the circulation pump supplies the sewage in the tank to the jet aerator through the No. 2 return pipe and the No. 1 return pipe, thereby enabling the sewage from the jet aerator to flow out, thereby achieving the aeration operation;

[0017] In the stirring working condition, the aeration fan and the No. 1 valve on the air supply pipe are first closed, and then the No. 2 valve on the bypass sewage pipe and the circulation pump are opened. The circulation pump supplies the sewage in the tank to the jet aerator through the No. 2 return pipe and the No. 1 return pipe, thereby achieving the stirring working condition;

[0018] Sedimentation working condition: shut down the circulation pump, shut down the aeration fan, close the No. 2 valve on the bypass sewage pipe and the No. 1 valve on the air supply pipe, thereby achieving the sedimentation working condition;

[0019] Mud discharge working condition: after the sedimentation working condition, the No. 3 valve on the mud discharge pipe is activated to discharge the mud;

[0020] The operation of the tank is usually carried out under micro-oxygen or anoxic conditions, and the ORP value in the tank is monitored by the ORP online monitoring instrument. The ORP value is usually between -100 and -300 mV. If the ORP value is lower than -300 mV for a long time, it is switched to aeration mode;

[0021] The tank body is usually operated in a micro-aerobic environment, and the DO value in the tank body is monitored by the DO online monitoring instrument. The DO value is controlled at 0.5-1.0 mg / L. If the DO value concentration exceeds 1.0 mg / L, the aeration fan is adjusted to reduce the aeration volume or switch to a stirring mode;

[0022] The suitable pH value in the tank is 6-8. The pH value in the tank is monitored by the pH online monitoring instrument. If the pH value is lower than 6 for a long time, the aeration mode is switched to or alkaline solution is added as needed. If the pH value is higher than 8 for a long time, the stirring mode is switched to or acid solution is added as needed.

[0023] The suitable temperature inside the tank is 15-25°C, and the temperature inside the tank is monitored by the temperature online monitoring instrument. When the monitored temperature is lower than 15°C, it is necessary to increase the reflux volume of the sludge return pipe or increase the air supply of the aeration fan to ensure sufficient dissolved oxygen supply.

[0024] The beneficial effects of this application are mainly:

[0025] This device not only has a high organic matter removal rate, high COD volume load, and small tank capacity, but is also very economical and efficient; it can operate at room temperature without heating and has low operating energy consumption; compared with existing anaerobic technology, no biogas is produced, and no biogas treatment equipment is required, making operation safer and more economical; at the same time, compared with existing high-efficiency aeration tanks or high-load aeration tanks, the sedimentation tank is eliminated, and a stirring function is configured to achieve automatic conversion between four operating conditions of aeration, stirring, sedimentation, and sludge discharge, realizing the integration of biological reaction and sedimentation; the tank body is equipped with DO online monitoring instruments, PH online monitoring instruments, ORP online monitoring instruments, and temperature online instruments to detect various tank body indicators and guide the safe and stable operation of the pretreatment device.

[0026] It should be understood that both the foregoing general description and the following detailed description are for purposes of illustration and description and are not necessarily limiting of the present application. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present application. Together, the description and the drawings serve to explain the principles of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic structural diagram of a pre-processing device according to an embodiment of the present application (front view);

[0029] Figure 2 This is a schematic structural diagram of a pre-treatment device according to an embodiment of the present application (front cross-sectional view);

[0030] Figure 3 This is a schematic diagram of the structure of the pretreatment device in an embodiment of the present application (top view).

[0031] icon:

[0032] 100-tank body; 101-jet aerator; 102-air supply pipe; 103-aeration fan; 104-bypass sewage pipe; 105-return pipe No. 1; 106-return pipe No. 2; 107-circulating pump; 108-water inlet pipe; 109-water outlet pipe; 110-sludge return pipe; 111-sludge discharge pipe; 112-valve No. 1; 113-valve No. 2; 114-valve No. 3; 115-outlet weir. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0034] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0037] See also Figure 1 、 Figure 2 and Figure 3In one or more embodiments, a high-load biological pretreatment device is provided, including a tank body 100, a jet aerator 101 is provided inside the tank body 100, an air supply pipe 102 is provided on the top of the jet aerator 101, the other end of the air supply pipe 102 extends to the outside of the tank body 100 and is connected to an aeration fan 103, a bypass sewage pipe 104 is provided inside the tank body 100, the other end of the bypass sewage pipe 104 is connected to the surface of the air supply pipe 102, and further includes a No. 1 return pipe 105, one end of the No. 1 return pipe 105 is connected to the bottom of the jet aerator 101, the other end of the No. 1 return pipe 105 extends to the outside of the tank body 100 and is connected to a circulation pump 107, the input end of the circulation pump 107 is connected to the No. 2 return pipe 106, and the No. 2 return pipe 107 is connected to the No. 2 return pipe 106. The other end of the tube 106 is connected to the inner cavity of the tank body 100. The interior of the tank body 100 is provided with an inlet pipe 108, an outlet pipe 109, a sludge return pipe 110 and a sludge discharge pipe 111. The other ends of the inlet pipe 108, the outlet pipe 109, the sludge return pipe 110 and the sludge discharge pipe 111 all extend to the outside of the tank body 100; a No. 1 valve 112 is provided on the surface of the air supply pipe 102 and located outside the tank body 100, a No. 2 valve 113 is provided on the surface of the bypass sewage pipe 104 and located inside the tank body 100, a No. 3 valve 114 is provided on the surface of the sludge discharge pipe 111 and located outside the tank body 100, and an outlet weir 115 is provided inside the tank body 100. One end of the outlet pipe 109 is located in the outlet space restricted by the outlet weir 115 and the tank body 100.

[0038] In this embodiment, the device realizes automatic conversion of four operating conditions: aeration, stirring, sedimentation, and sludge discharge, realizing integration of biological reaction and sedimentation; in the aeration condition, first close the No. 2 valve 113 on the bypass sewage pipe 104; then open the No. 1 valve 112, the circulation pump 107 and the aeration fan 103 on the air supply pipe 102 in sequence, and the gas generated by the aeration fan 103 supplies air to the jet aerator 101 through the air supply pipe 102, and finally realizes gas outflow through the jet aerator 101, and the circulation pump 107 will realize the sewage in the tank body 100 to be supplied to the jet aerator 101 through the No. 2 return pipe 106 and the No. 1 return pipe 105, and then realize the sewage outflow of the jet aerator 101, thereby realizing aeration work; in the stirring condition, first close the aeration fan 103 and the No. 1 valve 112 on the air supply pipe 102, and then open The No. 2 valve 113 and the circulation pump 107 on the bypass sewage pipe 104, the circulation pump 107 will supply the sewage in the tank body 100 to the jet aerator 101 through the No. 2 return pipe 106 and the No. 1 return pipe 105, thereby realizing stirring; in the sedimentation condition, the circulation pump 107 is turned off, the aeration fan 103 is turned off, the No. 2 valve 113 on the bypass sewage pipe 104, and the No. 1 valve 112 on the air supply pipe 102 are closed, thereby realizing sedimentation, and the sedimentation time is adjusted as needed; in the sludge discharge condition, the No. 3 valve 114 on the sludge discharge pipe 111 is started after the sedimentation work to realize sludge discharge; in the four operating conditions of aeration, stirring, sedimentation, and sludge discharge, the sewage always enters the tank body 100 through the water inlet pipe 108, the sewage in the tank body 100 flows out through the outlet pipe 109, and the sludge is always returned through the sludge return pipe 110.

[0039] In this embodiment, during drainage, only when the liquid level is higher than the height of the outlet weir 115, the sewage flows into the outlet space limited by the outlet weir 115 and the tank body 100, thereby realizing sewage circulation to achieve stable water discharge; the jet aerator 101 mainly provides oxygen for the bioreactor or plays a stirring role; the water inlet, water outlet, and sludge return of the tank body 100 are in a normally open state, which is not related to the switching of the four operating conditions, that is, the sedimentation and sludge discharge conditions can also achieve continuous water inlet, drainage and sludge return; in addition to the use of the jet aerator 101 and the setting of the bypass sewage pipe 104 mentioned above, the stirring function of this device can also be replaced by a special mixer.

[0040] It should be noted that in the embodiments of the present application, in addition to kitchen slurry, the device can also be used in the fields of treating landfill leachate and high-concentration organic wastewater corresponding to the names explained in the text;

[0041] Kitchen slurry: refers to the slurry after kitchen waste is pre-treated and physically extracted with oil;

[0042] Landfill leachate: specifically refers to the initial leachate from landfills and leachate from waste transfer stations (leachate from landfills in the middle and late stages is not included in the definition);

[0043] High-concentration organic wastewater refers to wastewater containing large amounts of biodegradable organic matter, which may be dissolved or suspended. This type of wastewater typically originates from industrial processes such as food processing, beverage production, papermaking, petrochemicals, and pharmaceuticals. High-concentration organic wastewater is characterized by high COD, high BOD (Biochemical Oxygen Demand), and high SS.

[0044] See also Figure 1 、 Figure 2 and Figure 3 In some embodiments, there is a height difference between the water inlet pipe 108 and the water outlet pipe 109, and the height of the water outlet pipe 109 is higher than the height of the water inlet pipe 108. The plane angle between the water outlet pipe 109 and the water inlet pipe 108 is at least ninety degrees; the plane angle between the sludge return pipe 110 and the water inlet pipe 108 is less than ninety degrees; the plane angle between the mud discharge pipe 111 and the water inlet pipe 108 is at least one hundred and thirty-five degrees, and the plane angle between the sludge return pipe 110 is at least ninety degrees.

[0045] In this embodiment, there is a height difference between the water inlet pipe 108 and the water outlet pipe 109, and the height of the water outlet pipe 109 is higher than the height of the water inlet pipe 108. The plane angle between the water outlet pipe 109 and the water inlet pipe 108 is at least ninety degrees, which effectively avoids the occurrence of short-circuit; the sludge return pipe 110 is as close to the water inlet pipe 108 as possible, and the plane angle between the sludge return pipe 110 and the water inlet pipe 108 is less than ninety degrees, so that the mud and water are mixed more evenly; the plane angle between the mud discharge pipe 111 and the water inlet pipe 108 is at least one hundred and thirty degrees. Five degrees and the included angle with the plane of the sludge return pipe 110 is at least ninety degrees to avoid water inflow and disturbance of return sludge during the sludge discharge stage; the device can play a separate stirring role without aeration by setting a bypass sewage pipe 104 and a jet aerator 101. Compared with conventional high-efficiency aeration tanks or high-load aeration tanks, the function is better and more convenient for actual operation; the device is provided with valve No. 1 112, valve No. 2 113 and valve No. 3 114, which can realize automatic control and operation, and each working condition can be freely switched as needed.

[0046] See also Figure 1 、 Figure 2 and Figure 3 In some embodiments, valve No. 1 12, valve No. 2 113 and valve No. 3 114 are electric valves, pneumatic valves or manual valves; the tank body 100 is an enamel assembled tank, an epoxy assembled tank, a stainless steel assembled tank or a concrete cast-in-place tank body.

[0047] In this embodiment, valve No. 1 112, valve No. 2 113 and valve No. 3 114 are electric valves, pneumatic valves or manual valves, wherein valve No. 1 112, valve No. 2 113 and valve No. 3 114 are automatically opened and closed according to the automatic control program according to the operation needs, and the tank body 100 is an enamel assembled tank, an epoxy assembled tank, a stainless steel assembled tank, a concrete cast-in-place tank body or a prefabricated assembly type, and the material selection of the tank body 100 includes but is not limited to the above materials.

[0048] Through the following control logic, the four operating conditions of aeration, stirring, sedimentation and sludge discharge can be automatically switched to achieve the integration of biological reaction and sedimentation.

[0049] (1) Aeration working condition: First close the No. 2 valve 113 on the bypass sewage pipe 104; then open the No. 1 valve 112 on the air supply pipe 102, the circulation pump 107, and the aeration fan 103 in sequence;

[0050] (2) Mixing condition: first close the aeration fan 103 and valve No. 1 112 on the air supply pipe 102, then open valve No. 2 113 on the bypass sewage pipe 104 and the circulation pump 107;

[0051] (3) Sedimentation and mud discharge working conditions: turn off the circulation pump 107, the aeration fan 103, close the No. 2 valve 113 on the bypass sewage pipe 104, and the No. 1 valve 112 on the air supply pipe 102, and start the No. 3 valve 114 on the mud discharge pipe 111 to discharge the mud after sedimentation for 1 to 2 hours (the time can be adjusted as needed).

[0052] See also Figure 1 、 Figure 2 and Figure 3 In some embodiments, an ORP online monitoring instrument is provided inside the tank body 100 , and the ORP online monitoring instrument is used to monitor the redox potential inside the tank body 100 in real time.

[0053] In this embodiment, the operation of the tank 100 is usually carried out under micro-oxic or anoxic conditions, and the ORP value is usually between -100 and -300 mV, indicating that the content of reducing substances or organic pollutants is high, the dissolved oxygen concentration is low, and the reducing environment is dominant. This environment is conducive to the growth of certain microorganisms, especially those that can remove pollutants through physical and chemical reactions under anoxic or anaerobic conditions. The ORP value plays a key role in the biological pretreatment process. It not only reflects the redox state in the system, but also can be used as a control parameter to help managers adjust the environmental conditions of the process operation. If the ORP value is lower than -300 mV for a long time, it is switched to aeration mode.

[0054] See also Figure 1 、 Figure 2 and Figure 3In some embodiments, a DO online monitoring instrument is provided inside the tank body 100 , and the DO online monitoring instrument is used to monitor the dissolved oxygen concentration in the tank body 100 in real time.

[0055] In this embodiment, the tank 100 is usually operated in a micro-aerobic environment, and the DO value is controlled at 0.5-1.0 mg / L. In this environment, biological pretreatment mainly removes organic matter by rapid adsorption, absorption, oxidation, etc., and at the same time cultivates a microbial population with a fast reproduction rate and high sludge yield. Therefore, an appropriate dissolved oxygen level is crucial to operation. If the DO value concentration exceeds 1.0 mg / L, adjust the aeration fan 103 to reduce the aeration volume or switch to a stirring mode.

[0056] See also Figure 1 、 Figure 2 and Figure 3 In some embodiments, a pH online monitoring instrument is provided inside the tank body 100 , and the pH online monitoring instrument is used to monitor the pH value inside the tank body 100 in real time.

[0057] In this embodiment, the microbial community in the tank 100 is mainly composed of prokaryotic bacteria. These microorganisms have a certain adaptability to changes in pH value, and the suitable pH value is 6-8. If the pH value deviates from the suitable range, it may affect the metabolic activity and adsorption capacity of the microorganisms, and thus affect the removal efficiency of pollutants. The sludge load of the tank 100 is relatively high, so the buffering capacity for pH value may be weak. If the pH value is lower than 6 for a long time, switch to aeration mode or add alkaline solution as needed. If the pH value is higher than 8 for a long time, switch to stirring mode or add acid as needed.

[0058] See also Figure 1 、 Figure 2 and Figure 3 In some embodiments, an online temperature monitoring instrument is provided inside the tank body 100 , and the online temperature monitoring instrument is used to monitor the temperature of the sewage in the tank body 100 in real time.

[0059] In this embodiment, water temperature affects many biochemical reactions in organisms and affects biological metabolic activity. A temperature increase within a certain range can accelerate the reaction rate of enzymes and promote microbial growth. For activated sludge systems, the optimal temperature range is 15-25°C. When the temperature is below 5°C, the life activities of microorganisms almost cease. Tank 100 operates under high load, with a high sludge load. Pollutant removal mainly relies on the adsorption effect of microorganisms. Low temperatures may slow the metabolic rate of microorganisms, thereby affecting the adsorption effect of section A and the removal efficiency of organic matter. However, the microbial population in tank 100 is mainly composed of prokaryotic bacteria with strong resistance to shock loads. These microorganisms generally have a certain degree of adaptability to temperature changes. However, if the temperature changes too much, it may affect the settling performance and adsorption capacity of the sludge. Under low temperature conditions, it is necessary to increase the return flow of the sludge return pipe 110 or increase the air supply of the aeration fan 103 to ensure sufficient dissolved oxygen supply to maintain microbial activity. At the same time, it is necessary to adjust the sludge age according to seasonal changes to adapt to the impact of temperature changes on the biological treatment effect.

[0060] See also Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, a method for using a high-load biological pretreatment device is provided, comprising the following steps:

[0061] Sewage always enters the tank body 100 through the water inlet pipe 108, the sewage in the tank body 100 always flows out through the water outlet pipe 109, and the sludge always flows back through the sludge return pipe 110;

[0062] To perform aeration, first close the No. 2 valve 113 on the bypass sewage pipe 104, then sequentially open the No. 1 valve 112, the circulation pump 107, and the aeration fan 103 on the air supply pipe 102. The gas generated by the aeration fan 103 supplies air to the jet aerator 101 through the air supply pipe 102, and finally the gas flows out through the jet aerator 101. The circulation pump 107 supplies the sewage in the tank 100 to the jet aerator 101 through the No. 2 return pipe 106 and the No. 1 return pipe 105, thereby realizing the sewage outflow from the jet aerator 101, thereby achieving the aeration condition.

[0063] In the stirring mode, the aeration fan 103 and the No. 1 valve 112 on the air supply pipe 102 are first closed, and then the No. 2 valve 113 and the circulation pump 107 on the bypass sewage pipe 104 are opened. The circulation pump 107 supplies the sewage in the tank 100 to the jet aerator 101 through the No. 2 return pipe 106 and the No. 1 return pipe 105, thereby achieving the stirring mode.

[0064] In the sedimentation condition, the circulation pump 107 is turned off, the aeration fan 103 is turned off, the second valve 113 on the bypass sewage pipe 104 and the first valve 112 on the air supply pipe 102 are closed, thereby achieving sedimentation;

[0065] In the mud discharge condition, after the sedimentation condition, the No. 3 valve 114 on the mud discharge pipe 111 is activated to discharge the mud;

[0066] The tank 100 is usually operated under micro-oxygen or anoxic conditions. The ORP value in the tank 100 is monitored by an ORP online monitoring instrument. The ORP value is usually between -100 and -300 mV. If the ORP value is lower than -300 mV for a long time, the aeration mode is switched.

[0067] The tank 100 is usually operated in a micro-aerobic environment. The DO value in the tank 100 is monitored by a DO online monitoring instrument. The DO value is controlled at 0.5-1.0 mg / L. If the DO value concentration exceeds 1.0 mg / L, the aeration fan 103 is adjusted to reduce the aeration volume or switch to a stirring mode.

[0068] The suitable pH value in the tank body 100 is 6-8. The pH value in the tank body 100 is monitored by a pH online monitoring instrument. If the pH value is lower than 6 for a long time, switch to an aeration mode or add alkaline solution as needed. If the pH value is higher than 8 for a long time, switch to a stirring mode or add acid as needed.

[0069] The suitable temperature in the tank body 100 is 15-25°C, and the temperature in the tank body 100 is monitored by an online temperature monitoring instrument. When the monitored temperature is lower than 15°C, it is necessary to increase the reflux volume of the sludge return pipe 110 or increase the air supply of the aeration fan 103 to ensure sufficient dissolved oxygen supply.

[0070] In this embodiment, the high-load biological pretreatment device is provided with multiple operating modes, which can realize the conversion of four operating conditions: aeration, stirring, sedimentation, and sludge discharge, realize the integration of biological reaction and sedimentation, and eliminate the sedimentation tank. The specific description is as follows:

[0071] 1. Aeration conditions: Provide oxygen to the tank, so that the reactor is in an oxygen-deficient state. Microorganisms continue to multiply and renew in this environment, and COD in the kitchen slurry is removed efficiently.

[0072] 2. Mixing condition: In actual operation, when the DO concentration in the tank is too high (the water quality and quantity of the food processing organic slurry vary greatly, the actual air supply and demand may differ or the adjustment may not be timely), the aeration can be stopped and the mixing function can be turned on to achieve effective mixing of the return sludge and sewage to ensure efficient biological reaction.

[0073] 3. Sedimentation conditions: After a period of reaction, the sludge in the reactor will age and it is necessary to stop the aeration and stirring functions to allow the sludge to settle naturally.

[0074] 4. Sludge discharge conditions: The aged residual sludge at the bottom is discharged.

[0075] Furthermore, the special practices of high-load biological pretreatment devices:

[0076] The first method is to set up a bypass sewage pipe 104, and the jet aerator 101 can play a role of stirring alone without aeration. Compared with conventional high-efficiency aeration tanks or high-load aeration tanks, it has better functions and is more convenient for actual operation.

[0077] The second method is to set valve No. 112, valve No. 2 113 and valve No. 3 114 to realize automatic control and operation, and each working condition can be freely switched as needed;

[0078] The third method is to adjust the positional relationship between the water outlet pipe 7, the sludge return pipe 8, the sludge discharge pipe 9 and the water inlet pipe 6.

[0079] It should be noted that the specific models and specifications of the ORP online monitoring instrument, DO online monitoring instrument, pH online monitoring instrument, temperature online monitoring instrument, circulation pump 107, aeration fan 103, valve No. 112, valve No. 2 113, and valve No. 3 114 in the present disclosure need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail; its power supply and principle are clear to those skilled in the art and will not be described in detail here; the connection and installation of its various parts and the signal transmission principles belong to the well-known technology in this field.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for using a high-load biological pretreatment device, characterized in that: The pretreatment device includes a tank body, a jet aerator is provided inside the tank body, an air supply pipe is provided on the top of the jet aerator, the other end of the air supply pipe extends to the outside of the tank body and is connected to an aeration fan, a bypass sewage pipe is provided inside the tank body, the other end of the bypass sewage pipe is connected to the surface of the air supply pipe, and also includes a No. 1 return pipe, one end of the No. 1 return pipe is connected to the bottom of the jet aerator, the other end of the No. 1 return pipe extends to the outside of the tank body and is connected to a circulation pump, the input end of the circulation pump is connected to the No. 2 return pipe, the other end of the No. 2 return pipe is communicated with the inner cavity of the tank body, and the interior of the tank body is provided with A water inlet pipe, a water outlet pipe, a sludge return pipe and a sludge discharge pipe, the other ends of the water inlet pipe, the water outlet pipe, the sludge return pipe and the sludge discharge pipe all extend to the outside of the tank body; a No. 1 valve is provided on the surface of the air supply pipe and located outside the tank body, a No. 2 valve is provided on the surface of the bypass sewage pipe and located inside the tank body, and a No. 3 valve is provided on the surface of the sludge discharge pipe and located outside the tank body; there is a height difference between the water inlet pipe and the water outlet pipe, and the height of the water outlet pipe is higher than the height of the water inlet pipe; an ORP online monitoring instrument, a DO online monitoring instrument, a pH online monitoring instrument and a temperature online monitoring instrument are provided inside the tank body; The method for using the pretreatment device includes the following steps: Sewage always enters the tank through the water inlet pipe, sewage in the tank always flows out through the water outlet pipe, and sludge always flows back through the sludge return pipe; In the aeration working condition, the No. 2 valve on the bypass sewage pipe is first closed, and then the No. 1 valve on the air supply pipe, the circulation pump and the aeration fan are opened in sequence. The gas generated by the aeration fan supplies the jet aerator through the air supply pipe, and finally the gas flows out through the jet aerator. The circulation pump supplies the sewage in the tank to the jet aerator through the No. 2 return pipe and the No. 1 return pipe, and then the sewage flows out of the jet aerator, thereby achieving the aeration working condition. In the stirring working condition, the aeration fan and the No. 1 valve on the air supply pipe are first closed, and then the No. 2 valve on the bypass sewage pipe and the circulation pump are opened. The circulation pump supplies the sewage in the tank to the jet aerator through the No. 2 return pipe and the No. 1 return pipe, thereby achieving the stirring working condition; Sedimentation working condition: shut down the circulation pump, shut down the aeration fan, close the No. 2 valve on the bypass sewage pipe and the No. 1 valve on the air supply pipe, thereby achieving the sedimentation working condition; Mud discharge working condition: after the sedimentation working condition, the No. 3 valve on the mud discharge pipe is activated to discharge the mud; The tank is operated in a micro-aerobic environment, and the ORP value in the tank is monitored by the ORP online monitoring instrument. The ORP value is between -100 and -300 mV. If the ORP value is lower than -300 mV for a long time, it is switched to an aeration mode; The tank is operated in a micro-aerobic environment, and the DO value in the tank is monitored by the DO online monitoring instrument. The DO value is controlled at 0.5-1.0 mg / L. If the DO value concentration exceeds 1.0 mg / L, the aeration fan is adjusted to reduce the aeration volume or switch to a stirring mode; The suitable pH value in the tank is 6-8. The pH value in the tank is monitored by the pH online monitoring instrument. If the pH value is lower than 6 for a long time, the aeration mode is switched to or alkaline solution is added as needed. If the pH value is higher than 8 for a long time, the stirring mode is switched to or acid solution is added as needed. The suitable temperature inside the tank is 15-25°C, and the temperature inside the tank is monitored by the temperature online monitoring instrument. When the monitored temperature is lower than 15°C, it is necessary to increase the reflux volume of the sludge return pipe or increase the air supply of the aeration fan to ensure sufficient dissolved oxygen supply.

2. The method for using a high-load biological pretreatment device according to claim 1, characterized in that: A water outlet weir is provided inside the tank body, and one end of the water outlet pipe is located in a water outlet space limited by the water outlet weir and the tank body.

3. The method for using a high-load biological pretreatment device according to claim 1, characterized in that: The planar angle between the outlet pipe and the water inlet pipe is at least ninety degrees; the planar angle between the sludge return pipe and the water inlet pipe is less than ninety degrees; the planar angle between the mud discharge pipe and the water inlet pipe is at least one hundred and thirty-five degrees, and the planar angle between the mud discharge pipe and the sludge return pipe is at least ninety degrees.

4. The method for using a high-load biological pretreatment device according to claim 1, characterized in that: The valve No. 1, the valve No. 2 and the valve No. 3 are electric valves, pneumatic valves or manual valves; the tank body is an enamel assembled tank, an epoxy assembled tank, a stainless steel assembled tank or a concrete cast-in-place tank body.

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