CN212198904U - Landfill leachate's processing system - Google Patents
Landfill leachate's processing system Download PDFInfo
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- CN212198904U CN212198904U CN201922232397.8U CN201922232397U CN212198904U CN 212198904 U CN212198904 U CN 212198904U CN 201922232397 U CN201922232397 U CN 201922232397U CN 212198904 U CN212198904 U CN 212198904U
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Abstract
The utility model discloses a landfill leachate treatment system, the landfill leachate treatment system includes plug flow type biochemical reaction device, sets up in parameter detection device, parameter adjustment device and programmable controller among the biochemical reaction device, wherein, plug flow type biochemical reaction device includes the denitrification pond, nitrifies pond, postposition denitrification pond and postposition and nitrifies the pond that set gradually according to landfill leachate flow direction; the parameter detection device and the parameter adjusting device are in signal connection with the programmable controller, so that the programmable controller can acquire the parameters detected by the parameter detection device and send adjusting instructions to the parameter adjusting device, automatic control of the parameters in the biochemical reaction device can be realized, and the parameter control of the treatment of the landfill leachate is more accurate.
Description
Technical Field
The utility model relates to a sewage treatment technical field especially relates to landfill leachate's processing system.
Background
With the increasing urban population and the improving living conditions, the continuous rise of the domestic garbage production amount brings a serious challenge to garbage disposal. At present, domestic garbage is mainly treated by a landfill method, but landfill generates a large amount of landfill leachate, the landfill leachate is high ammonia nitrogen organic matter sewage with complex components, and if the high ammonia nitrogen organic matter sewage is directly discharged into the environment without treatment, serious environmental pollution can be caused. Therefore, the removal of ammonia nitrogen in the landfill leachate is an important step in the treatment of the landfill leachate.
At present, ammonia nitrogen in landfill leachate is mainly removed by means of a biological denitrification technology, namely, the ammonia nitrogen in the landfill leachate is firstly oxidized into nitrite nitrogen or nitrate nitrogen by using bacteria, and then the nitrite nitrogen or the nitrate nitrogen is subjected to denitrification to form nitrogen, so that denitrification of the landfill leachate is realized. In order to realize good denitrification of the landfill leachate, the operation parameters of the biochemical reaction system, such as PH, temperature, dissolved oxygen concentration and the like, need to be accurately controlled to meet the growth of bacteria.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a landfill leachate's processing system, aims at solving the operating parameter that needs artifical regulation biochemical reaction system among the current landfill leachate denitrification treatment, the lower problem of control accuracy.
In order to realize the purpose of the utility model, the utility model provides a treatment system of garbage leachate, which comprises a plug flow type biochemical reaction device, a parameter detection device, a parameter adjusting device and a programmable controller which are arranged in the biochemical reaction device, wherein,
the plug-flow biochemical reaction device comprises a denitrification tank, a nitrification tank, a post-positioned denitrification tank and a post-positioned nitrification tank which are sequentially arranged according to the flow direction of the landfill leachate;
the parameter detection device comprises at least one of a PH sensor, a dissolved oxygen concentration sensor, a gas flow meter, a temperature sensor, a liquid flow meter, an ammonia nitrogen sensor, a nitrite nitrogen sensor, a foam sensor and a solid concentration sensor;
the parameter adjusting device comprises at least one of an acid-base adding component, an aeration component, a temperature adjusting component, a carbon source adding component, a defoaming agent adding component, a water inlet pump and a sludge discharge valve;
the parameter detection device and the parameter adjusting device are in signal connection with the programmable controller.
Preferably, the pH sensors are arranged in the denitrification tank and the nitrification tank, an alkali adding port of the acid-alkali adding component is communicated with the denitrification tank and the nitrification tank, and an acid adding port of the acid-alkali adding component is communicated with the denitrification tank.
Preferably, the dissolved oxygen concentration sensor is arranged in the nitrification tank and the post-nitrification tank, the aeration assembly comprises an air blower, an aeration pipe and an aeration head arranged in the nitrification tank and the post-nitrification tank, one end of the aeration pipe is connected with an air outlet of the air blower, the other end of the aeration pipe is connected with the aeration head, and the gas flow meter is arranged in the aeration pipe.
Preferably, the temperature sensor and the temperature adjusting assembly are arranged in the denitrification tank, the nitrification tank, the post-positioned denitrification tank and the post-positioned nitrification tank.
Preferably, the nitrite sensor is arranged at a water outlet of the denitrification tank, and the carbon source adding assembly is communicated with a water inlet of the denitrification tank and a water inlet of the post-positioned denitrification tank.
Preferably, the water inlet of denitrification pond is connected with the inlet tube, be provided with on the inlet tube the intake pump, fluidflowmeter set up in the inlet tube of denitrification pond, the delivery port and the mud discharging mouth of rearmounted nitrification pond, the ammonia nitrogen sensor set up in the delivery port of rearmounted nitrification pond.
Preferably, the foam sensor is arranged in the nitrification tank and the post-nitrification tank, and the defoaming agent adding assembly is communicated with the nitrification tank and the post-nitrification tank.
Preferably, the nitrification tank is further connected with a return pipe, the other end of the return pipe is connected with the denitrification tank, a return pump and the liquid flowmeter are arranged on the return pipe, and the flowmeter and the return pump are both connected with the programmable logic controller.
Preferably, the water outlet of the post-nitrification tank is provided with a mud-water separation membrane, the sludge discharge port is arranged below the water outlet, the sludge discharge port is connected with a sludge discharge pipe, the sludge discharge pipe is provided with the liquid flowmeter and the sludge discharge valve, and the solid concentration sensor is arranged in the post-nitrification tank.
Preferably, the sludge discharge port is further connected with a sludge return pipe, the other end of the sludge return pipe is connected with a water inlet of the denitrification tank, and the sludge return pipe is provided with the liquid flowmeter and the sludge pump.
The embodiment of the utility model provides a landfill leachate's processing system, landfill leachate's processing system includes plug flow formula biochemical reaction unit, sets up in parameter detection device, parameter adjustment device and programmable controller among the biochemical reaction unit, wherein, plug flow formula biochemical reaction unit includes the denitrification pond, nitrify the pond, postposition denitrification pond and the postposition of nitrifying the pond that set gradually according to landfill leachate flow direction; the parameter detection device comprises at least one of a PH sensor, a dissolved oxygen concentration sensor, a gas flow meter, a temperature sensor, a liquid flow meter, an ammonia nitrogen sensor, a nitrite nitrogen sensor, a foam sensor and a solid concentration sensor; the parameter adjusting device comprises at least one of an acid-base adding component, an aeration component, a temperature adjusting component, a carbon source adding component, a defoaming agent adding component, a water inlet pump and a sludge discharge valve; the parameter detection device and the parameter adjusting device are in signal connection with the programmable controller. Therefore, the programmable controller can acquire the parameters detected by the parameter detection device and send the adjusting instruction to the parameter adjusting device, so that the automatic control of the parameters in the biochemical reaction device can be realized, and the parameter control of the treatment of the landfill leachate is more accurate.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is the schematic structural diagram of the system for treating landfill leachate of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, horizontal, vertical … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a landfill leachate's processing system, a landfill leachate processing system that can automatically regulated control parameter.
Referring to fig. 1, the utility model provides a landfill leachate's processing system, landfill leachate's processing system mainly used short cut nitrification denitrification biological nitrogen removal technology handles landfill leachate. The landfill leachate treatment system comprises a plug flow type biochemical reaction device (not shown in the figure), a parameter detection device (not shown in the figure) arranged in the biochemical reaction device, a parameter adjustment device (not shown in the figure) and a programmable controller 10. The plug-flow biochemical reaction device comprises a denitrification tank 20, a nitrification tank 30, a post-positioned denitrification tank 40 and a post-positioned nitrification tank 50 which are sequentially arranged according to the flow direction of the landfill leachate, wherein the nitrification tank 30 and the post-positioned nitrification tank 50 are used for oxidizing ammonia nitrogen in the landfill leachate into nitrite nitrogen, the denitrification tank 20 and the post-positioned denitrification tank 40 are used for reducing the nitrite nitrogen into nitrogen so as to realize denitrification, and the post-positioned nitrification tank 50 is also used for consuming redundant carbon sources in the landfill leachate treated by the post-positioned denitrification tank 40 so as to reduce the carbon content of effluent and further improve the quality of the effluent. Preferably, the digestion tank comprises at least two tank bodies to improve the efficiency of oxidizing ammonia nitrogen in the landfill leachate into nitrite nitrogen. The adjacent two tank bodies are connected through a water inlet, namely the water outlet of the front tank body in the adjacent two tank bodies is connected with the water inlet of the rear tank body. Preferably, the water inlet and the water outlet of the same tank body are arranged on opposite sides in the horizontal and vertical directions, taking the denitrification tank 20 as an example, when the water inlet of the denitrification tank 20 is arranged on the upper part of the left side wall of the denitrification tank 20, the water outlet thereof is arranged on the lower part of the right side wall, so that the liquid in the whole plug-flow type biochemical reaction device can be integrally pushed in the flow direction.
The parameter detection device comprises at least one of a PH sensor 60, a dissolved oxygen concentration sensor 70, a gas flow meter 80, a temperature sensor 90, a liquid flow meter 100, an ammonia nitrogen sensor 110, a nitrite nitrogen sensor 120, a foam sensor 130 and a solid concentration sensor 140 and is used for detecting parameters in the plug-flow biochemical reaction device; the parameter adjusting device comprises at least one of an acid-base adding component 150, an aeration component (not marked in the figure), a temperature adjusting component (not marked in the figure), a carbon source adding component 160, a defoaming agent adding component 170, a water inlet pump 180 and a sludge discharge valve 190, and is used for adjusting parameters in the plug-flow biochemical reaction device; the parameter detection device and the parameter adjustment device are both in signal connection with the programmable controller 10, so that the programmable controller 10 can acquire the parameters detected by the parameter detection device and send control instructions to the parameter adjustment device. The programmable controller 10 is configured to control the parameter adjusting device according to the parameter detected by the parameter detecting device and a preset parameter.
The embodiment of the utility model provides an in, parameter detection device and parameter adjustment device all with programmable controller 10 signal connection, thereby make programmable controller 10 can acquire the parameter that parameter detection device detected, and to parameter adjustment device sends control command, programmable controller 10 can be based on parameter that parameter detection device detected and preset parameter control parameter adjustment device to parameter automatic control among the biochemical reaction device has been realized, the parameter control of the processing of landfill leachate is more accurate.
Further, with continued reference to fig. 1, the PH sensor 60 is disposed in the denitrification tank 20 and the nitrification tank 30 for detecting the PH values in the denitrification tank 20 and the nitrification tank 30, and it should be understood that, when the digestion tank has a plurality of tank bodies, the PH sensor is disposed in each tank body of each digestion tank. When the short-cut nitrification and denitrification treatment is carried out, the pH value of the whole system is basically kept stable after the pH value is adjusted to the preset range, so the adjustment of the pH value is mainly carried out in the denitrification tank 20, while part of alkali is consumed when the ammonia nitrogen is oxidized into nitrite nitrogen in the nitrification tank 30, when the PH value is reduced to be below the lower limit of the preset range, alkali is needed to be added to increase the PH value, therefore, in the embodiment of the utility model, an alkali adding port 151 of the acid-alkali adding component 150 is communicated with the denitrification tank 20 and the nitrification tank 30, so that the acid-base adding device can add the base into the denitrification tank 20 and the nitrification tank 30, the acid adding port 152 of the acid-base adding component 150 is communicated with the denitrification tank 20, so that the acid-base adding device can add acid into the denitrification tank 20 and the nitrification tank 30. The communication mode can be through a pipeline and the like, and is not particularly limited herein. Furthermore, it is understood that the acid and alkali adding component 150 can be provided as one component, or can be separately provided as two components, i.e., the acid adding component and the alkali adding component are provided separately.
And the programmable controller 10 controls the acid-base adding component 150 to add alkali or acid according to the pH value and a preset pH value. Specifically, the programmable controller 10 stores preset PH ranges corresponding to the denitrification tank 20 and the nitrification tank 30, and the preset PH range may be a PH parameter range in a corresponding tank body in the shortcut nitrification and denitrification process. When the detected PH value exceeds the preset PH range, the programmable controller 10 starts the acid-base adding component 150 to add acid or base to the corresponding cell body (when the detected PH value is lower than the lower limit of the preset PH range, the base is added, and when the detected PH value is higher than the upper limit of the preset PH range, the acid is added). The programmable controller 10 can store a corresponding relationship between the PH value and the amount of acid/alkali to be added, the corresponding relationship is related to parameters such as the capacity of the tank body, and can be obtained through experiments, and the programmable controller 10 obtains and controls the acid/alkali adding component 150 to add the detected amount of acid/alkali corresponding to the PH value into the corresponding tank body. The programmable controller 10 further stores a PH preset threshold, and the PH preset threshold is within the preset PH range and can be set according to actual conditions, which is not specifically limited herein. After adding acid/alkali into the corresponding cell body for a preset time, the programmable controller 10 obtains a detected pH value, when the detected pH value reaches the preset pH threshold, the programmable controller 10 controls the acid/alkali adding component 150 to stop, and when the detected pH value does not reach the preset pH threshold, the acid/alkali is continuously added according to the detected pH value, and the operation is repeated until the detected pH value reaches the preset pH threshold. In addition, the control of the acid/alkali adding amount can be controlled by controlling the adding frequency, specifically, the preset value (fixed value) of the acid/alkali adding amount of the acid/alkali adding component 150 is controlled, the preset value of the adding amount can be realized by setting the size of the adding container, namely, the size of the adding container is set to be the preset value when the adding container is full. The programmable controller 10 further stores a corresponding relationship between the PH value and the acid/alkali adding frequency, the programmable controller 10 obtains the detected PH value in real time, and controls the acid/alkali adding component 150 to obtain the corresponding acid/alkali adding frequency according to the detected PH value to perform acid/alkali adding, it can be understood that the preset value of the amount of acid/alkali added each time and the corresponding relationship between the PH value and the adding frequency can be set according to an actual situation, and no specific limitation is made herein. Similarly, when the detected PH reaches the preset PH threshold, the programmable controller 10 controls the acid-base adding component 150 to stop. Therefore, the pH value in the plug-flow biochemical reaction device can be quickly and accurately automatically adjusted, and the control of the pH value is more accurate.
Further, when the ammonia nitrogen is oxidized into nitrite nitrogen, a large amount of dissolved oxygen needs to be consumed, and the concentration of the dissolved oxygen needs to be controlled in the nitrification tank 30 and the post-nitrification tank 50, in which the ammonia nitrogen is oxidized into nitrite nitrogen. Therefore, with continued reference to fig. 1, the dissolved oxygen concentration sensor 70 is disposed in the nitrification tank 30 and the post-nitrification tank 50, and is used for detecting the dissolved oxygen concentration in the nitrification tank 30 and the post-nitrification tank 50. The aeration assembly comprises an air blower 200, an aeration pipe 210 and an aeration head 220 arranged in the nitrification tank 30 and the post-nitrification tank 50, wherein one end of the aeration pipe 210 is connected with an air outlet of the air blower 200, and the other end of the aeration pipe is connected with the aeration head 220, so that the air blower 200 can aerate the digestion tank and the post-nitrification tank 50 through the aeration pipe 210 and the aeration head 220 to improve the dissolved oxygen concentration thereof. It should be understood that when the digestion tank comprises a plurality of tank bodies, the aeration head 220 is arranged in each tank body, and the number of the aeration heads 220 in each tank body (including the post-nitrification tank 50) can be one or more. Including venturi and jet pump in the aeration head 220, the jet pump provides large-traffic pressure water, the gas that pressure water and air-blower 200 provided passes through venturi mixes, releases, forms even micro bubble, and even diffusion realizes oxygenating the function in aqueous. The gas flow meter is disposed in the aeration tube 210 to detect an aeration flow rate. The programmable controller 10 controls the blower 200 according to the dissolved oxygen concentration, a preset dissolved oxygen concentration, and the aeration flow. Specifically, a preset dissolved oxygen concentration range is stored in the programmable controller 10, the preset dissolved oxygen concentration range may be a dissolved oxygen concentration parameter range in the corresponding cell body in the shortcut nitrification and denitrification process, and when the detected dissolved oxygen concentration is smaller than the minimum value of the preset dissolved oxygen concentration range, the blower 200 is controlled to start to perform aeration. The programmable controller 10 further stores the corresponding relationship between the dissolved oxygen concentration and the (total) aeration flow rate, the programmable controller 10 obtains the corresponding aeration flow rate according to the detected dissolved oxygen concentration, and controls the load of the blower 200 according to the aeration flow rate, so that the aeration flow rate detected by the gas flow meter 80 is equal to the aeration flow rate corresponding to the dissolved oxygen concentration. The dissolved oxygen concentration is continuously increased along with the aeration, when the dissolved oxygen concentration reaches a preset threshold, the operation of the blower 200 is stopped, and the preset threshold is within the range of the preset oxygen concentration threshold and can be set according to the actual situation, which is not limited specifically herein. Thereby realizing the automatic control of the concentration of the dissolved oxygen in the nitrification tank 30 and the denitrification tank 20 and improving the control accuracy of the concentration of the dissolved oxygen.
Further, please refer to fig. 1, the temperature sensor 90 and the temperature adjusting component are disposed in the denitrification tank 20, the nitrification tank 30, the post-denitrification tank 40 and the post-nitrification tank 50, and the temperature sensor 90 is configured to detect the temperatures in the denitrification tank 20, the nitrification tank 30, the post-denitrification tank 40 and the post-nitrification tank 50 and send the detected temperatures to the programmable controller 10. The temperature adjustment assembly includes at least one of a heating device and a cooling device, which may be a conventional heating device/cooling device, and is not particularly limited herein, for example, the cooling device may be composed of a plate-and-frame heat exchanger and a cooling tower. The programmable controller 10 controls the temperature adjusting assembly according to the temperature and a preset temperature value, thereby realizing temperature control. Specifically, the preset temperature range stored in the programmable controller 10 may be a temperature parameter range of the corresponding cell body in the shortcut nitrification and denitrification process. When the detected temperature exceeds the preset temperature range, the programmable controller 10 controls the temperature adjusting assembly to start, so as to heat or cool the liquid in the corresponding pool body, and when the detected temperature reaches a preset temperature threshold value, the temperature adjusting assembly is stopped. The preset temperature threshold is within the preset temperature range and can be set according to actual conditions. Thereby realizing the automatic control of the temperature in the denitrification tank 20, the nitrification tank 30, the post-denitrification tank 40 and the post-nitrification tank 50 and improving the accuracy of temperature control.
Further, in the shortcut nitrification and denitrification process, the bacteria need to consume the carbon source to perform the shortcut nitrification and denitrification, so the carbon source needs to be added, whether the carbon source needs to be added and the amount of the carbon source needs to be added can be judged by the content of nitrite nitrogen in the liquid after denitrification treatment, in addition, whether the carbon source needs to be added is also related to the quality of the inlet water, the quality of the inlet water can be detected and then directly input into the programmable controller 10 for storage, and the parameters of the quality of the inlet water can include liquid COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), ammonia nitrogen concentration and the like. Therefore, referring to fig. 1, in the embodiment of the present invention, the nitrite sensor is disposed at the water outlet of the denitrification tank 20, and is configured to detect the nitrite nitrogen concentration of the liquid at the water outlet of the denitrification tank 20, and send the nitrite nitrogen concentration to the programmable controller 10. The carbon source adding component 160 is communicated with the water inlet of the denitrification tank 20 and the water inlet of the post-denitrification tank 40, so that the carbon source adding component 160 can add carbon sources into the denitrification tank 20 and the post-denitrification tank 40. The programmable controller 10 controls the carbon source adding component 160 according to the nitrite nitrogen concentration and the water quality parameter of the inlet water, so as to add carbon sources into the denitrification tank 20 and the post-denitrification tank 40 and adjust the carbon source concentration. Specifically, the programmable controller 10 stores the corresponding relationship between the influent water quality parameter, the nitrite nitrogen concentration and the carbon source adding amount, the programmable controller 10 controls the carbon source adding assembly 160 to add the carbon source with the influent water quality parameter and the detected nitrite nitrogen concentration corresponding amount, and when the detected nitrite nitrogen concentration is reduced to the preset concentration threshold, the carbon source adding is stopped. In addition, the control of the carbon source adding amount can also be controlled by controlling the adding frequency, specifically, controlling the preset value (fixed value) of the amount of the carbon source added by the carbon source adding component 160 every time, wherein the preset value of the adding amount can be realized by setting the size of the adding container, that is, the size of the adding container is set to be the preset value when the adding container is full. The programmable controller 10 further stores a corresponding relationship among a water quality parameter of inlet water, a nitrite nitrogen concentration and a carbon source adding frequency, the programmable controller 10 obtains the detected nitrite nitrogen concentration in real time, and controls the carbon source adding component 160 to obtain the corresponding carbon source adding frequency according to the water quality parameter of inlet water and the detected nitrite nitrogen concentration for adding the carbon source, it can be understood that the preset value of the amount of the carbon source to be added each time and the corresponding relationship among the water quality parameter of inlet water, the nitrite nitrogen concentration and the adding frequency can be set according to an actual situation, and no specific limitation is made herein. Similarly, when the detected nitrite nitrogen concentration reaches the preset nitrite nitrogen concentration threshold, the programmable controller 10 controls the carbon source adding component 160 to stop. Therefore, the carbon source in the plug flow type biochemical reaction device can be quickly and accurately automatically adjusted, and the control of the carbon source is more accurate.
Further, in the plug-flow biochemical reaction device, when the plug-flow biochemical reaction device is in stable operation, the water inlet flow and the water outlet flow are the same under normal conditions, but new sludge is continuously generated in the short-cut nitrification and denitrification process, so that part of sludge needs to be discharged outside, and at the moment, in order to ensure that the liquid level in the whole biochemical reaction device is not changed, the water inlet flow needs to be controlled to be equal to the sum of the water outlet flow and the sludge discharge flow when the sludge is discharged outside. Therefore, please continue to refer to fig. 1, in the embodiment of the present invention, the water inlet of the denitrification tank 20 is connected with a water inlet pipe, the water inlet pipe is provided with the water inlet pump 180, the liquid flow meter 100 is arranged on the water inlet pipe of the denitrification tank 20, the water outlet and the sludge discharge port of the post-nitrification tank 50, and is respectively used for detecting the water inlet flow of the denitrification tank 20, the water outlet flow of the post-nitrification tank 50 and the sludge discharge flow, and sending the detected flow data to the programmable controller 10. The programmable controller 10 controls the water inlet pump 180 according to the water outlet flow, the sludge discharge flow and the water inlet flow. The programmable controller 10 calculates the sum of the effluent flow and the sludge outflow flow of the post-nitrification tank 50, and uses the sum as a preset value of the influent flow, and controls the load of the influent pump 180 according to the preset value of the influent flow, so that the detected influent flow is equal to the preset value of the influent flow. In addition, a liquid level meter may be further provided in the post-nitrification tank 50 to increase/decrease the load of the water feed pump 180 when the detected liquid level exceeds a preset liquid level range.
In addition, the treatment capacity of the plug flow type biochemical reaction system also needs to be considered for controlling the water flow rate of inlet and outlet water, and when the ammonia nitrogen content of the outlet water is too high, the current water flow rate is higher than the treatment capacity of the plug flow type biochemical reaction system, and the water flow rate needs to be reduced. Therefore, further, the ammonia nitrogen sensor 110 is disposed at the water outlet of the post-nitrification tank 50, and is configured to detect the ammonia nitrogen content of the effluent of the post-nitrification tank 50, and send the ammonia nitrogen content to the programmable logic controller 10. The programmable controller 10 also controls the water inlet pump 180 according to the effluent ammonia nitrogen content and a preset effluent ammonia nitrogen content threshold value. Specifically, when the ammonia nitrogen content of the outlet water exceeds the preset ammonia nitrogen content threshold value of the outlet water, the programmable controller 10 reduces the load of the inlet water pump 180 to reduce the inlet water flow rate, and simultaneously adjusts the outlet water flow rate according to the reduced inlet water flow rate. After the preset time, the water inlet pump 180 is adjusted according to the detected ammonia nitrogen content of the outlet water until the ammonia nitrogen content of the outlet water is reduced to be below the preset ammonia nitrogen content threshold value of the outlet water. Therefore, the automatic regulation of the water flow in and out of the plug flow type biochemical reaction device can be realized, and the control of the water flow in and out is more accurate.
Further, since a large amount of foam is often generated in the nitrification tank 30 by aeration, the foam may overflow from above the tank when the foam is too high, and it is necessary to perform defoaming treatment when the foam exceeds a certain height. Therefore, referring to fig. 1, in the embodiment of the present invention, the foam sensor 130 is disposed in the nitrification tank 30 and the post-nitrification tank 50, and is used for detecting the foam height in the nitrification tank 30 and the post-nitrification tank 50. The defoaming agent adding component 170 is communicated with the nitrification tank 30 and the post-nitrification tank 50 so as to add a defoaming agent into the nitrification tank 30 and the post-nitrification tank 50. It should be understood that when the digestion tank includes a plurality of tank bodies, the foam sensor 130 is disposed in each tank body, and the defoaming agent feeding assembly 170 is communicated with each tank body. And when the detected foam height is greater than or equal to the preset height threshold value, the programmable controller 10 carries out addition of the defoaming agent. Specifically, the programmable controller 10 stores a corresponding relationship among a water inflow rate, an aeration flow rate, and an antifoaming agent adding amount, and when the detected foam height is greater than a preset threshold, the programmable controller 10 controls the antifoaming agent adding assembly 170 to add the antifoaming agent in an amount corresponding to the water inflow rate and the aeration flow rate (the currently detected water inflow rate and aeration flow rate) to the corresponding tank body. After the preset time, if the detected height of the defoaming agent is greater than or equal to the preset height threshold, continuing to add the defoaming agent according to the method, and stopping adding the defoaming agent when the detected height of the defoaming agent is less than the preset height threshold. Therefore, the adding of the defoaming agent in the plug flow type biochemical reaction device can be automatically controlled, and the foam height in the plug flow type biochemical reaction device can be more accurately controlled.
Further, due to the slow biochemical reaction rate, in order to improve the removal rate of ammonia nitrogen in the landfill leachate, multiple short-cut nitrification and denitrification treatments need to be performed on the landfill leachate. Therefore, please continue to refer to fig. 1, in the embodiment of the present invention, the nitrification tank 30 is further connected with a return pipe, the return pipe is connected near the water outlet of the nitrification tank 30, the other end of the return pipe is connected with the denitrification tank 20, preferably, connected near the water inlet of the denitrification tank, so that the liquid treated by the digestion tank flows back to the denitrification tank 20 for denitrification, and then enters the digestion tank from the denitrification tank 20 to form a return circulation, thereby realizing multiple treatment of the landfill leachate. In the reflux process, the proportion (reflux ratio) between the reflux liquid flow and the water inlet flow needs to be controlled, so that the removal rate and the treatment efficiency of ammonia nitrogen in the landfill leachate are considered. Therefore, the return pipe is provided with a return pump 230 and the liquid flowmeter 100, the flowmeter and the return pump 230 are both connected with the programmable controller 10, and the flowmeter is used for detecting the flow rate of the return liquid in the return pipe and sending the detected flow rate of the return liquid to the programmable controller 10. The programmable controller 10 stores a preset reflux ratio, the programmable controller 10 calculates a set reflux flow of nitrite according to the preset reflux ratio and the water inlet flow, and then controls the reflux pump 230 according to the set reflux flow so that the reflux flow detected by the flowmeter is equal to the set reflux flow, thereby automatically controlling the reflux of nitrite in the plug flow type biochemical reaction device and enabling the reflux control of nitrite to be more accurate.
Further, in the process of shortcut nitrification and denitrification, as the inlet water (landfill leachate) contains solid matter, the sludge concentration of the whole system needs to be discharged for treatment in order to control the sludge concentration of the system within a preset range. Therefore, referring to fig. 1, in the embodiment of the present invention, a sludge-water separation membrane is disposed at the water outlet of the post-nitrification tank 50 to separate the treated landfill leachate into sludge and water, so as to obtain effluent without solid matter and sludge with high solid matter concentration. The sludge discharge port is arranged below the water outlet and is connected with a sludge discharge pipe for discharging sludge. The sludge discharge pipe is provided with the liquid flowmeter 100 and the sludge discharge valve 190, and the liquid flowmeter 100 is used for detecting the sludge discharge flow. The solid concentration sensor 140 is disposed in the post-nitrification tank 50, and is configured to detect the solid concentration in the post-nitrification tank 50, and send the solid concentration to the programmable logic controller 10. The programmable controller 10 controls the opening and closing of the sludge discharge valve 190 according to the solid concentration, the preset solid concentration and the sludge discharge flow rate. Specifically, the programmable controller 10 stores a preset solid concentration range and also stores a corresponding relationship between the solid concentration and the sludge external displacement, and when the detected solid concentration is greater than the upper limit of the preset solid concentration range, the sludge external displacement corresponding to the solid concentration is obtained. And then, opening the sludge discharge valve 190 to discharge sludge, calculating the sludge discharge capacity according to the sludge discharge capacity detected by the flowmeter, and stopping discharging sludge when the sludge discharge capacity reaches the sludge discharge capacity corresponding to the solid concentration. In addition, the control of the discharge of the excess sludge can be corrected according to the quality and the flow of the inlet water by referring to the quality and the flow of the inlet water. Therefore, the automatic discharge of the excess sludge can be automatically controlled, and the control of the solid/sludge concentration in the plug-flow biochemical reaction device is more accurate.
Further, in the shortcut nitrification and denitrification process, microorganisms are basically attached to the sludge, and the sludge needs to be controlled to flow back in order to ensure the amount of the microorganisms in the whole system. Therefore, please continue to refer to fig. 1, in the embodiment of the present invention, the sludge discharge port is further connected to a sludge return pipe, the other end of the sludge return pipe is connected to the water inlet of the denitrification tank 20, the sludge return pipe is provided with the liquid flow meter 100 and the sludge pump 240, the liquid flow meter 100 is configured to detect the sludge return flow rate in the sludge return pipe, and send the detected sludge return flow rate to the editable controller. The programmable controller 10 is configured to control the sludge reflux pump 230 according to a preset sludge reflux ratio, the water inlet flow rate, and the sludge reflux flow rate. Specifically, a preset sludge reflux ratio is stored in the programmable controller 10, the programmable controller 10 calculates a set reflux flow rate of the sludge according to the preset sludge reflux ratio and the water inlet flow meter, and then controls the load of the reflux pump 230 according to the set reflux flow rate of the sludge, so that the sludge reflux flow rate detected by the flow meter is equal to the set reflux flow rate of the sludge, thereby automatically controlling the reflux of the sludge in the plug-flow biochemical reaction device, and enabling the control of the concentration of the solid/sludge in the plug-flow biochemical reaction device to be more accurate.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A treatment system of landfill leachate is characterized by comprising a plug flow type biochemical reaction device, a parameter detection device, a parameter adjusting device and a programmable controller which are arranged in the biochemical reaction device, wherein,
the plug-flow biochemical reaction device comprises a denitrification tank, a nitrification tank, a post-positioned denitrification tank and a post-positioned nitrification tank which are sequentially arranged according to the flow direction of the landfill leachate;
the parameter detection device comprises at least one of a PH sensor, a dissolved oxygen concentration sensor, a gas flow meter, a temperature sensor, a liquid flow meter, an ammonia nitrogen sensor, a nitrite nitrogen sensor, a foam sensor and a solid concentration sensor;
the parameter adjusting device comprises at least one of an acid-base adding component, an aeration component, a temperature adjusting component, a carbon source adding component, a defoaming agent adding component, a water inlet pump and a sludge discharge valve;
the parameter detection device and the parameter adjusting device are in signal connection with the programmable controller.
2. The landfill leachate treatment system of claim 1, wherein the PH sensors are disposed in the denitrification tank and the nitrification tank, the alkali dosing port of the acid-alkali dosing assembly is communicated with the denitrification tank and the nitrification tank, and the acid dosing port of the acid-alkali dosing assembly is communicated with the denitrification tank.
3. The landfill leachate treatment system of claim 1, wherein the dissolved oxygen concentration sensor is disposed in the nitrification tank and the post-nitrification tank, the aeration assembly comprises a blower, an aeration pipe and an aeration head disposed in the nitrification tank and the post-nitrification tank, one end of the aeration pipe is connected to an air outlet of the blower, the other end of the aeration pipe is connected to the aeration head, and the gas flow meter is disposed in the aeration pipe.
4. The landfill leachate treatment system of claim 1, wherein the temperature sensor and the temperature regulating assembly are disposed within the denitrification tank, the nitrification tank, the post-denitrification tank, and the post-nitrification tank.
5. The landfill leachate treatment system of claim 1, wherein the nitrite nitrogen sensor is disposed at a water outlet of the denitrification tank, and the carbon source adding assembly is communicated with a water inlet of the denitrification tank and a water inlet of the post-positioned denitrification tank.
6. The landfill leachate treatment system of claim 1, wherein the water inlet of the denitrification tank is connected with a water inlet pipe, the water inlet pipe is provided with the water inlet pump, the liquid flow meter is arranged on the water inlet pipe of the denitrification tank, the water outlet and the sludge discharge port of the post-nitrification tank, and the ammonia nitrogen sensor is arranged at the water outlet of the post-nitrification tank.
7. The landfill leachate treatment system of claim 6, wherein the foam sensor is disposed in the nitrification tank and the post-nitrification tank, and the defoamer dosing assembly is communicated with the nitrification tank and the post-nitrification tank.
8. The landfill leachate treatment system of claim 6, wherein the nitrification tank is further connected with a return pipe, the other end of the return pipe is connected with the denitrification tank, a return pump and the liquid flow meter are arranged on the return pipe, and the flow meter and the return pump are both connected with the programmable controller.
9. The landfill leachate treatment system of claim 6, wherein a sludge-water separation membrane is disposed at the water outlet of the post-nitrification tank, the sludge discharge port is disposed below the water outlet, a sludge discharge pipe is connected to the sludge discharge port, the sludge discharge pipe is provided with the liquid flowmeter and the sludge discharge valve, and the solid concentration sensor is disposed in the post-nitrification tank.
10. The landfill leachate treatment system of claim 9, wherein the sludge discharge port is further connected with a sludge return pipe, the other end of the sludge return pipe is connected with the water inlet of the denitrification tank, and the sludge return pipe is provided with the liquid flow meter and the sludge pump.
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| CN201922232397.8U CN212198904U (en) | 2019-12-12 | 2019-12-12 | Landfill leachate's processing system |
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| CN201922232397.8U CN212198904U (en) | 2019-12-12 | 2019-12-12 | Landfill leachate's processing system |
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