A method and device for improving the efficiency of wastewater biological treatment by using day-night temperature difference

Abstract

A device for improving the efficiency of wastewater biological treatment by using the day-night temperature difference, comprising a water treatment mechanism, a time control mechanism, a reflux mechanism, a temperature control mechanism and a bypass mechanism; the time control mechanism includes a sensor, a timer, an electronic controller, a water storage valve, a water storage pipe, a water storage tank, a second water inlet pipe and a second water inlet valve. The sensor is installed in the reactor, the timer is installed in the water storage tank and the water inlet tank. The water inlet tank is connected to the water storage tank through the second water inlet pipe, the second water inlet valve is installed on the second water inlet pipe, the water storage tank is connected to the reactor through the water storage pipe, the water storage valve is installed on the water storage pipe, and the electronic controller is connected to the sensor, the timer, the second water inlet valve and the water storage valve. The present invention also discloses a method for improving the efficiency of wastewater biological treatment, in which the anaerobic unit is fixedly executed during the day and the aerobic unit is fixedly executed at night; by setting a time adjustment mechanism, the aerobic unit is arranged at night and the anaerobic unit is arranged during the day to create a temperature condition more favorable for the aerobic-anaerobic reaction.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and particularly relates to a method and device for improving the efficiency of wastewater biological treatment by utilizing the day-night temperature difference. Background Art

[0002] The respiration of aerobic microorganisms is one of the key steps in treating organic pollutants in water. Increasing the dissolved oxygen concentration in water is a simple and feasible method to improve the efficiency of aerobic reactions. The aeration process is a process of forcibly transferring oxygen in the air to the liquid phase so that sufficient dissolved oxygen can be obtained in the water. Dissolved oxygen can oxidize some pollutants in the water and supply microorganisms for endogenous respiration to ensure the survival of aerobic microorganisms. When the dissolved oxygen is sufficient, microorganisms will perform exogenous respiration, obtain energy by decomposing carbon- and nitrogen-containing organic matter in the water for reproduction. During the process of microorganism proliferation, pollutants are converted into pollution-free carbon dioxide, nitrogen, water, etc.

[0003] To cope with increasingly strict water quality standards, wastewater treatment plants often maintain the aeration volume at a relatively high level. Although this can ensure that the effluent quality meets the standards and ensure nitrification reactions, it inevitably causes energy waste. The dissolved oxygen generated by excessive aeration is not fully dissolved in the water body and utilized by microorganisms, but instead escapes into the air in the form of oxygen, resulting in great energy waste. In addition, aerobic reactions are affected by factors such as influent flow rate, influent components, and concentration fluctuations. When the supply of dissolved oxygen is insufficient, it is easy to cause the effluent quality not to meet the standards. Summary of the Invention

[0004] In order to overcome the above deficiencies in the prior art, the purpose of the present invention is to provide a device for improving the efficiency of wastewater biological treatment by utilizing the day-night temperature difference, which adjusts the operation time of anaerobic and aerobic reactions in water treatment and avoids energy waste caused by excessive aeration.

[0005] The present invention also provides a method for improving the efficiency of wastewater biological treatment.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A device for improving the efficiency of wastewater biological treatment by utilizing the day-night temperature difference, comprising a water treatment mechanism, a time control mechanism, a reflux mechanism, a temperature control mechanism, and a bypass mechanism, wherein the reflux mechanism is connected to the temperature control mechanism;

[0008] The water treatment mechanism includes a water inlet tank, a filter, a reactor, a water outlet tank, a first water inlet pipe, a water inlet valve, a water outlet pipe, and a water outlet valve. The water inlet tank is connected to the water inlet end. The filter is installed inside the water inlet tank. The water inlet end of the first water inlet pipe is connected to the water inlet tank. The first water inlet valve is installed on the first water inlet pipe. The water outlet end of the first water inlet pipe is connected to the reactor. The water inlet end of the water outlet pipe is connected to the reactor. The water outlet valve is installed on the water outlet pipe. The water outlet end of the water outlet pipe is connected to the water inlet end of the water outlet tank. The reflux mechanism is connected to the bypass mechanism through the reactor.

[0009] The time control mechanism includes a sensor, a timer, an electronic controller, a water storage valve, a water storage pipe, a water storage tank, a second water inlet pipe, and a second water inlet valve. The sensor is installed in the reactor. The timer is installed in the water storage tank and the water inlet tank respectively. The water inlet end of the second water inlet pipe is connected to the water inlet tank. The water outlet end of the second water inlet pipe is connected to the water storage tank. The second water inlet valve is installed on the second water inlet pipe. The water inlet end of the water storage pipe is connected to the water storage tank. The water outlet end of the water storage pipe is connected to the reactor. The water storage valve is installed on the water storage pipe. The first signal input end of the electronic controller is connected to the sensor. The second signal input end of the electronic controller is connected to the timer. The first signal output end of the electronic controller is connected to the second water inlet valve. The second signal output end of the electronic controller is connected to the water storage valve. The third signal output end of the electronic controller is connected to the first water inlet valve.

[0010] Preferably, an aeration member and a stirring member are installed in the reactor.

[0011] More preferably, the reactor is a sequencing batch reactor or a continuous flow reactor.

[0012] Preferably, the filter is a grid.

[0013] Preferably, the reflux mechanism includes a water reflux pipe, a flow measurement collection tank, a flow measurement pipe, a flow measurement valve, a buffer tank, and a sludge disposer. The flow measurement collection tank is connected to the sequencing batch reactor through the flow measurement pipe. The flow measurement valve is installed on the flow measurement pipe. The flow measurement collection tank is connected to the fourth signal output end of the electronic controller. The sludge discharge end of the flow measurement collection tank is connected to the sludge disposer. The flow measurement collection tank is connected to the temperature control mechanism through the water reflux pipe. The water inlet end of the buffer tank is connected to the reactor through a water pumping member. The water outlet end of the buffer tank is connected to the flow measurement collection tank. The sludge inlet end of the sludge disposer is connected to the buffer tank. The sludge outlet end of the sludge disposer is connected to the bypass mechanism. The sludge disposer is connected to the fifth signal output end of the electronic controller.

[0014] Preferably, the reflux mechanism further includes a chemical dosing member, and the chemical outlet end of the chemical dosing member is connected to the flow measurement and collection tank.

[0015] Preferably, the bypass mechanism includes a sludge bypass tank, a sewage and wastewater bypass tank, and a bypass pipeline; the sludge outlet end of the sludge bypass tank is connected to the bypass pipeline, the sludge inlet end of the sludge bypass tank is connected to the sludge disposer, the water outlet end of the sewage and wastewater bypass tank is connected to the bypass pipeline, the water inlet end of the sewage and wastewater bypass tank is connected to the sludge disposer, and the bypass pipeline is connected to the reactor.

[0016] Preferably, stirring members are arranged in the sludge bypass tank and the sewage and wastewater bypass tank.

[0017] Preferably, the temperature adjustment mechanism includes a photovoltaic panel, a heat pipe, a heat exchanger, and a temperature controller. The heat pipe is installed on the photovoltaic panel. The heat input end of the heat exchanger is connected to the heat pipe. The heat output end of the heat exchanger is connected to the water return pipe. The signal input end of the temperature controller is connected to the water return pipe. The signal output end of the temperature controller is connected to the heat exchanger.

[0018] A method for improving the efficiency of wastewater biological treatment by using the diurnal temperature difference, based on the device for improving the efficiency of wastewater biological treatment by using the diurnal temperature difference, fixedly executes the anaerobic unit during the day and fixedly executes the aerobic unit at night.

[0019] The present invention has the following advantages and beneficial effects compared with the prior art:

[0020] By setting up a time adjustment mechanism, the present invention uses a reservoir to collect the incoming water with irregular flow rate and injects it into the first anaerobic or aerobic unit at a continuous and average flow rate according to the time arrangement of the corresponding process. The aerobic unit is arranged at night and the anaerobic unit is arranged during the day to create a temperature condition more favorable for the aerobic-anaerobic reaction. The suitable temperature for anaerobic treatment is 35-40 °C, and the most suitable temperature for aerobic reaction is 20-25 °C; anaerobic treatment during the day can make full use of the high temperature and solar energy during the day, maintain a relatively high reaction temperature without consuming electricity, inhibit the occurrence of side reactions, reduce greenhouse gas emissions, increase the internal energy of the water body by recycling solar energy and waste heat, and reduce the heating energy consumption during winter operation; aerobic treatment at night can improve the reoxygenation ability of the system through low temperature, increase the redox potential of the system, and promote aerobic reactions such as nitrification and phosphorus uptake. The core of the water treatment process is the process of obtaining the self-organization of the water body by using the fluctuation and dissipation of dissolved oxygen. Therefore, all water treatment processes must be aerobic-anaerobic alternation and have stable periodicity and batch characteristics.

[0021] Moreover, 50%-70% of the power consumption in water treatment occurs in the aeration process of aerobic treatment. This operation mode arranges the aerobic unit with high power consumption at night, which helps to cut the peak and fill the valley of the power grid and reduce the total electricity cost of the sewage treatment plant. In the traditional operation mode, the aerobic units are randomly arranged in different periods, increasing the power consumption during peak electricity consumption periods.

[0022] The present invention provides energy, carbon source, return flow liquid and water treatment chemicals to the reaction unit by adding an independent return system and bypass system. The water treatment-photovoltaic device provides a part of the power during the peak electricity consumption period during the day, and recovers the waste heat of the photovoltaic panel through water return while generating electricity, effectively increasing the temperature of the anaerobic unit. Brief Description of the Drawings

[0023] Figure 1 is a schematic diagram of a device for improving the efficiency of wastewater biological treatment by using the day-night temperature difference of the present invention;

[0024] Figure 2 is a schematic diagram of a device for improving the efficiency of wastewater biological treatment by using the day-night temperature difference of the present invention;

[0025] Figure 3 is a flow chart of a device for improving the efficiency of wastewater biological treatment by using the day-night temperature difference of the present invention;

[0026] Markings of each component in the drawings:

[0027] 1 - water treatment mechanism, 2 - time control mechanism, 3 - return mechanism, 4 - temperature control mechanism, 5 - bypass mechanism, 11 - water inlet tank, 12 - reactor, 13 - water outlet tank, 14 - first water inlet pipe, 21 - electronic controller, 22 - water storage tank, 23 - second water inlet pipe, 31 - water return pipe, 32 - flow measurement and collection tank, 33 - buffer tank, 34 - sludge disposer, 35 - chemical addition part, 41 - photovoltaic panel, 42 - heat exchanger, 51 - sludge bypass tank, 52 - sewage bypass tank, 53 - bypass pipeline. Detailed Description of the Embodiment

[0028] The following further describes the invention object of the present invention in detail with reference to the drawings and specific embodiments. The embodiments cannot be described in detail one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0029] Embodiment 1

[0030] A device for improving the efficiency of wastewater biological treatment by using the day-night temperature difference, comprising a water treatment mechanism 1, a time control mechanism 2, a reflux mechanism 3, a temperature control mechanism 4 and a bypass mechanism 5; the water treatment mechanism 1 includes a water inlet tank 11, a filter, a reactor 12, a water outlet tank 13, a first water inlet pipe 14, a water inlet valve, a water outlet pipe and a water outlet valve; the time control mechanism 2 includes a sensor, a timer, an electronic controller 21, a water storage valve, a water storage pipe, a water storage tank 22, a second water inlet pipe 23 and a second water inlet valve; the reflux mechanism 3 includes a water return pipe 31, a flow measurement collection tank 32, a flow measurement pipe, a flow measurement valve, a buffer tank 33, a sludge disposer 34 and a chemical addition member 35; the temperature regulation mechanism 4 includes a photovoltaic panel 41, a heat pipe, a heat exchanger 42 and a temperature controller; the bypass mechanism 5 includes a sludge bypass tank 51, a sewage and wastewater bypass tank 52 and a bypass pipe 53.

[0031] The water inlet tank (11) is connected to the water inlet end, and a grille is installed inside the water inlet tank 11 to filter impurities in the incoming water; the water outlet end of the water inlet tank 11 is connected to the water inlet end of the first water inlet pipe 14, the first water inlet valve is installed in the middle of the first water inlet pipe 14, the water outlet end of the first water inlet pipe 14 is connected to the water inlet end of the sequencing batch reactor 12, the water inlet end of the second water inlet pipe 23 is connected to the water inlet tank 11, the water outlet end of the second water inlet pipe 23 is connected to the water storage tank 22, the second water inlet valve is installed in the middle of the second water inlet pipe 23, the water inlet end of the water storage pipe is connected to the water outlet end of the water storage tank 22, the water storage valve is installed in the middle of the water storage pipe, and the water outlet end of the water storage pipe is connected to the water inlet end of the reactor 12; the second signal output end of the electronic controller 21 is connected to the water storage valve.

[0032] The first water outlet end of the sequencing batch reactor 12 is connected to the water inlet end of the water outlet pipe, the water outlet end of the water outlet pipe is connected to the water inlet end of the water outlet tank 13, the water outlet valve is installed in the middle of the water outlet pipe, and the water outlet end of the water outlet tank 13 is connected to the external river; the second water outlet end of the sequencing batch reactor 12 is connected to the water inlet end of the flow measurement pipe, the water outlet end of the flow measurement pipe is connected to the water inlet end of the flow measurement collection tank 32, the flow measurement valve is installed in the middle of the flow measurement pipe, and a water pumping member is also installed on the flow measurement pipe.

[0033] A stirrer and an aeration member are installed at the inner bottom of the sequencing batch reactor 12, and the sensor is installed at the upper right end inside the reactor 12; the timer is respectively installed at the upper ends of the water storage tank 22 and the water inlet tank 11, the signal output end of the sensor is connected to the first signal input end of the electronic controller 21; the second signal input end of the electronic controller 21 is connected to the signal output end of the timer; the signal input ends of the first water inlet valve, the first water outlet valve and the flow measurement valve are connected to the third signal output end of the electronic controller 21;

[0034] The bottom of the flow measurement and collection tank 32 is in an inverted conical shape, and the top is connected to a support frame. A central pipe is rotatably connected to the support frame. Two sludge scraping rods are connected to the bottom end of the central pipe. The central pipe is hollow and has a sludge suction end at the bottom. A sludge collection tank is provided at the central position of the bottom of the flow measurement and collection tank 32. One side of the flow measurement and collection tank 32 is connected to a sludge discharge pipe, and the sludge discharge pipe is communicated with the sludge collection tank. The sludge collection tank is communicated with the sludge disposal device 34. A water return member is installed in the flow measurement and collection tank 32, and the water return member is connected to the fourth signal output end of the electronic controller. There is a feed end above the flow measurement and collection tank 32. The medicine outlet end of a medicine adding member 35 is connected through a medicine adding pipe at the feed end, and an adsorbent is contained in the medicine adding member 35.

[0035] The water inlet end of the water return pipe 31 is connected to the water outlet end of the flow measurement and collection tank 32, the water outlet end of the water return pipe 31 is connected to the water inlet end of the flow measurement and collection tank 32, the heat input end at the left end of the water return pipe 31 is connected to the heat output end of the heat exchanger 42, the heat input end of the heat exchanger 42 is connected to the heat output end of the heat pipe, and the heat pipe is installed on the back of the photovoltaic panel 41 to transfer the waste heat in the heat pipe to the return water through the heat exchanger 42. The signal output end of the temperature controller is connected to the signal input end of the heat exchanger 42, and the temperature sensing end of the temperature controller is installed on the inner wall of the left side of the water return pipe 31. The temperature of the return water is monitored through the temperature controller, and the working state of the heat exchanger 42 is automatically adjusted as needed to keep the temperature of the return water within a suitable range.

[0036] The water inlet end at the front side of the buffer tank 33 is connected to the water outlet end of the sequencing batch reactor 12 through a water pumping member. The water outlet end at the left end of the buffer tank 33 is connected to the water inlet end of the flow measurement and collection tank 32 to supply the additional return liquid required during the peak period or simultaneously collect the newly added incoming water generated due to time changes. The sludge outlet end at the right side of the buffer tank 33 is connected to the sludge inlet end of the sludge disposal device 34 through a sludge pumping member. The sludge pumping member includes a sludge pump, a sludge suction pipe, and a conveying pipe. The sludge inlet end of the sludge pump is connected to the sludge outlet end of the sludge suction pipe. The sludge suction pipe extends into the central pipe. The sludge inlet end of the sludge suction pipe is connected to the sludge outlet end of the buffer tank 33, and the sludge delivery end of the sludge suction pipe is connected to the sludge inlet end of the sludge disposal device 34. The conveying pipe is installed at the bottom of the buffer tank 33. A spiral auger is provided in the conveying pipe. A rotating motor for driving the spiral auger to rotate is installed on one side of the outer wall of the treatment tank. The top of the conveying pipe is provided with a sludge inlet end. A sludge return member is installed inside the sludge return device, and the sludge return member is connected to the fifth signal output end of the electronic controller 21.

[0037] The water return member and the sludge return member realize the recycling of water and the return of sludge through the water pumping member to ensure the normal operation of the reactor 12 and the stability of water quality. The electronic controller 21 is respectively connected to the water return member and the sludge return member to control the switches of the water pumping member and the sludge delivery member to realize the automatic control of sewage and wastewater treatment.

[0038] The sludge inlet end of the sludge bypass tank 51 is connected to the sludge outlet end of the sludge treatment device 34. The water outlet end of the sludge treatment device 34 is connected to the water inlet end of the sewage and wastewater bypass tank 52. The water inlet end of the bypass pipeline 53 is connected to the water outlet end of the sewage and wastewater bypass tank 52. The sludge inlet end of the bypass pipeline 53 is connected to the sludge outlet end of the sludge bypass tank 51. The discharge end of the bypass pipeline 53 is connected to the feed end of the reactor 12 to enhance the carbon source efficiency during the reaction process. Stirring members are provided inside the sludge bypass tank 51 and the sewage and wastewater bypass tank 52 to fully mix the sewage and wastewater or sludge. The sludge bypass tank 51 and the sewage and wastewater bypass tank 52 are provided with anti-backflow measures to prevent the sewage and wastewater from flowing back into the sludge bypass tank 51.

[0039] Sludge bypass can not only control the residence time of the mixture in the reaction tank, make the reaction in the reaction tank proceed fully, improve the reaction effect, but also control the liquid level of the mixture in the reaction tank, avoid the overflow of the mixture, and maintain the water quality stability in the reaction tank. Through sludge bypass, the operation and management can be made more convenient, and the residence time of the mixture in the reaction tank can be extended, thereby reducing the wastewater discharge.

[0040] At night, the aerobic unit starts. The sewage is preliminarily filtered through the grille. The electronic controller 21 opens the first water inlet valve, and the sewage flows from the water inlet tank 11 to the reactor 12 through the first water inlet pipe 14. At this time, the timer starts timing, and the water inlet of the first water inlet pipe 14 is stopped according to the required water inlet time of the process. The electronic controller 21 closes the first water inlet valve; the electronic controller 21 opens the second water inlet valve, and the water inlet tank 11 stores the raw water in the storage tank 22 through the second water inlet pipe 23, so that the reactor 12 processes according to the normal steps at the unified start time, achieving the time allocation of anaerobic during the day and aerobic at night.

[0041] The sensor in the reactor 12 detects the water quality of the incoming water. When the sensor in the reactor 12 detects that the water quality of the sewage is better and reaches the discharge standard, the electronic controller 21 opens the water outlet valve to discharge the sewage from the water tank.

[0042] When the sensor in the reactor 12 detects that the water quality of the sewage does not meet the discharge standard, the electronic controller 21 turns on the aeration member and the stirring member in the reactor 12 to aerate and stir the sewage for aerobic reaction. The flow measurement valve opens and is emptied to facilitate the cooling and reoxygenation of the aerobic unit.

[0043] When the aerobic unit ends, the electronic controller 21 opens the flow measurement valve, and the sewage enters the flow measurement collection tank 32 from the reactor 12 through the flow measurement pipe. Meanwhile, the dosing member 35 drops the adsorbent to purify the water quality. The water return member of the flow measurement collection tank 32 is opened, and the sewage enters the water return pipe 31 for reflux. When the temperature is low, the heat exchanger 42 transfers the heat from the photovoltaic panel 41 to the heat pipe to the water return pipe 31, thereby increasing the temperature of the anaerobic unit; when the temperature controller detects that the temperature reaches 35 °C, the reflux liquid is transported through a straight pipe without absorbing waste heat; when the sensor in the water return pipe 31 monitors that the water quality is good, it transmits a signal to the electronic controller 21, and the electronic controller 21 controls the dosing member 35 to stop dosing;

[0044] When there is new incoming water due to time change or additional reflux liquid required during the peak period, the buffer valve opens, and the sewage enters the buffer tank 33 from the reactor 12 through the buffer pipe, and the sewage is transported to the flow measurement collection tank 32 through the bottom delivery pipe for reflux.

[0045] After the water reflux is completed and it is detected as qualified by the sensor in the reactor, the electronic controller 21 opens the outlet valve, closes the water return pipe valve and the flow measurement valve, and discharges the purified sewage to the outlet water tank 13.

[0046] In the flow measurement collection tank 32, the sludge in the sewage accumulates in the sludge collection tank at the bottom of the tank, and the sludge is transported to the sludge disposer 34 by the sludge pump. In the buffer tank, the precipitated sludge in the sewage is transported to the sludge disposer 34 by the sludge delivery member. After the sludge disposer 34 processes the sludge, the sewage in it is transported to the reactor 12 through the sewage and wastewater bypass tank 52 to continue to participate in the reaction, and the sludge in it is refluxed to the reactor 12 through the sludge bypass tank 51.

[0047] Embodiment 2

[0048] The total residence time of urban domestic sewage is about 18 hours and is completed in one sub-cycle;

[0049] Taking one day as a sub-cycle.

[0050] For the AAO process, the system inlet water time is from 5:00 to 6:00, the A1 unit operates from 7:00 to 12:00, sedimentation and sludge discharge are carried out from 12:00 to 13:00, the A2 unit operates from 13:00 to 19:00, sedimentation and standing are carried out from 19:00 to 22:00, the O unit operates from 22:00 to 3:00 the next day, and drainage and idling are carried out from 3:00 to 5:00.

[0051] For the AOO process, the system inlet water time is from 11:00 to 12:00. The A unit operates from 13:00 to 18:00. Sedimentation, sludge discharge, and static settling are carried out from 19:00 to 21:00. The O1 unit operates from 21:00 to 2:00 the next day. Sludge discharge and aeration are carried out from 2:00 to 3:00. The O2 unit operates from 3:00 to 8:00. Drainage and idling are carried out from 9:00 to 11:00.

[0052] For the OHO process, the inlet water time is from 0:00 to 1:00 at night. The O1 unit operates from 1:00 to 7:00. Sedimentation and sludge discharge are carried out from 7:00 to 9:00. The H unit operates from 9:00 to 15:00. Sedimentation, sludge discharge, and static settling are carried out from 15:00 to 17:00. The O2 unit operates from 17:00 to 22:00. Drainage and idling are carried out from 22:00 to 0:00 the next day.

[0053] Example 3

[0054] The total residence time of industrial wastewater and landfill leachate is about 36 hours, which is completed in two sub - cycles.

[0055] For the AAO process, the inlet water time is from 0:00 to 1:00 at night. The A1 unit operates from 1:00 to 13:00. Sedimentation and sludge discharge are carried out from 13:00 to 14:00. The A2 unit operates from 14:00 to 2:00 the next day. Static settling and aeration are carried out from 2:00 to 3:00. The O unit operates from 3:00 to 15:00. Drainage and idling are carried out from 15:00 to 0:00.

[0056] For the AOO process, the inlet water time is from 7:00 to 8:00. The A unit operates from 8:00 to 20:00. Static settling, sedimentation, and sludge discharge are carried out from 20:00 to 21:00. The O1 unit operates from 21:00 to 9:00 the next day. Sludge discharge and aeration are carried out from 9:00 to 10:00. The O2 unit operates from 10:00 to 22:00. Drainage and idling are carried out from 22:00 to 7:00 on the third day.

[0057] For the OHO process, the inlet water time is from 19:00 to 20:00. The O1 unit operates from 20:00 to 8:00 the next day. Sedimentation and sludge discharge are carried out from 8:00 to 9:00. The H unit operates from 9:00 to 21:00. Static settling and aeration are carried out from 21:00 to 22:00. The O2 unit operates from 22:00 to 10:00 on the third day. Drainage and idling are carried out from 10:00 to 19:00.

[0058] The above - mentioned specific implementation manners are the preferred embodiments of the present invention and cannot limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. An apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference, characterized in that, It includes a water treatment mechanism (1), a time control mechanism (2), a reflux mechanism (3), a temperature control mechanism (4) and a bypass mechanism (5), and the reflux mechanism (3) is connected to the temperature control mechanism (4); The water treatment mechanism (1) includes a water inlet tank (11), a filter, a reactor (12), a water outlet tank (13), a first water inlet pipe (14), a water inlet valve, a water outlet pipe and a water outlet valve. The water inlet tank (11) is connected to the water inlet end. The filter is installed inside the water inlet tank (11). The water inlet end of the first water inlet pipe (14) is connected to the water inlet tank (11), and a first water inlet valve is installed on the first water inlet pipe (14). The water outlet end of the first water inlet pipe (14) is connected to the reactor (12). The water inlet end of the water outlet pipe is connected to the reactor (12), the water outlet valve is installed on the water outlet pipe, and the water outlet end of the water outlet pipe is connected to the water inlet end of the water outlet tank (13). The reflux mechanism (3) is connected to the bypass mechanism (5) through the reactor (12); The time control mechanism (2) includes a sensor, a timer, an electronic controller (21), a water storage valve, a water storage pipe, a water storage tank (22), a second water inlet pipe (23) and a second water inlet valve. The sensor is installed on the reactor (12). The timer is installed on the water storage tank (22) and the water inlet tank (11) respectively. The water inlet end of the second water inlet pipe (23) is connected to the water inlet tank (11), the water outlet end of the second water inlet pipe (23) is connected to the water storage tank (22), and the second water inlet valve is installed on the second water inlet pipe (23). The water inlet end of the water storage pipe is connected to the water storage tank (22), the water outlet end of the water storage pipe is connected to the reactor (12), and the water storage valve is installed on the water storage pipe. The first signal input end of the electronic controller (21) is connected to the sensor, the second signal input end of the electronic controller (21) is connected to the timer, the first signal output end of the electronic controller (21) is connected to the second water inlet valve, the second signal output end of the electronic controller (21) is connected to the water storage valve, and the third signal output end of the electronic controller (21) is connected to the first water inlet valve.

2. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 1, characterized in that, An aeration member and a stirring member are installed in the reactor (12).

3. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 2, characterized in that, The reactor (12) is a sequencing batch reactor or a continuous flow reactor.

4. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 1, characterized in that, The filter is a grid.

5. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 3, characterized in that, The reflux mechanism (3) includes a water reflux pipe (31), a flow measurement collection tank (32), a flow measurement pipe, a flow measurement valve, a buffer tank (33), and a sludge disposer (34). The flow measurement collection tank (32) is connected to the sequencing batch reactor through the flow measurement pipe. The flow measurement valve is installed on the flow measurement pipe. The flow measurement collection tank (32) is connected to the fourth signal output end of the electronic controller (21). The sludge discharge end of the flow measurement collection tank (32) is connected to the sludge disposer (34). The flow measurement collection tank (32) is connected to the temperature control mechanism (4) through the water reflux pipe (31). The water inlet end of the buffer tank (33) is connected to the reactor (12) through a water pumping member. The water outlet end of the buffer tank (33) is connected to the flow measurement collection tank (32). The sludge inlet end of the sludge disposer (34) is connected to the buffer tank (33). The discharge end of the sludge disposer (34) is connected to the bypass mechanism (5). The sludge disposer (34) is connected to the fifth signal output end of the electronic controller (21).

6. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 5, characterized in that, The reflux mechanism (3) further includes a chemical dosing member (35). The chemical dosing end of the chemical dosing member (35) is connected to the flow measurement collection tank (32).

7. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 5, characterized in that, The bypass mechanism (5) includes a sludge bypass tank (51), a sewage and wastewater bypass tank (52), and a bypass pipe (53). The sludge outlet end of the sludge bypass tank (51) is connected to the bypass pipe (53). The sludge inlet end of the sludge bypass tank (51) is connected to the sludge disposer (34). The water outlet end of the sewage and wastewater bypass tank (52) is connected to the bypass pipe (53). The water inlet end of the sewage and wastewater bypass tank (52) is connected to the sludge disposer (34). The bypass pipe (53) is connected to the reactor (12).

8. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 7, characterized in that, Stirring members are arranged in the sludge bypass tank (51) and the sewage and wastewater bypass tank (52).

9. The apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to claim 5, characterized in that, The temperature adjustment mechanism includes a photovoltaic panel (41), a heat pipe, a heat exchanger (42), and a temperature controller. The heat pipe is installed on the photovoltaic panel (41). The heat input end of the heat exchanger (42) is connected to the heat pipe. The heat output end of the heat exchanger (42) is connected to the water reflux pipe (31). The signal input end of the temperature controller is connected to the water reflux pipe (31). The signal output end of the temperature controller is connected to the heat exchanger (42).

10. A method for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference, based on the apparatus for improving the efficiency of wastewater biological treatment by utilizing the diurnal temperature difference according to any one of claims 1 - 9, characterized in that, The anaerobic unit is fixedly executed during the day, and the aerobic unit is fixedly executed at night.

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