A / O biological denitrification device

Abstract

The utility model relates to an A / O biological denitrification device which comprises a water inlet tank, an anaerobic tank, an aerobic tank and a sedimentation tank which are arranged in sequence, the water inlet tank is provided with a water inlet; the anaerobic tank is provided with a first inflow port; the aerobic tank is provided with a second inflow port and a sedimentation tank, and the upper end is provided with a drainage port; a water inlet channel is arranged between the water inlet tank and the anaerobic tank; a first backflow channel is arranged between the anaerobic tank and the aerobic tank; a second backflow channel is arranged between the aerobic tank and the sedimentation tank; the utility model aims to realize efficient and stable operation of nitrification and denitrification, improve denitrification efficiency and total nitrogen volume load and enhance system stability, and is not only suitable for treatment of general industrial sewage and domestic sewage, but also suitable for treatment of industrial sewage with low carbon nitrogen ratio. The method is especially suitable for treatment of high-ammonia-nitrogen-concentration wastewater.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, especially an A / O biological denitrification device. BACKGROUND

[0002] High ammonia nitrogen wastewater mainly comes from chemical industry, pharmaceutical industry, chemical fertilizer industry, breeding industry and the like, and directly discharging into the environment will lead to water eutrophication and cause serious environmental pollution. High ammonia nitrogen wastewater has characteristics of wide source and great water quality change, and its discharge into water body not only harms aquatic organisms, but also seriously endangers drinking water safety. The purpose of sewage treatment is to make sewage reach the standard so as to be safely discharged into water body or reused, and this process relies on the action of microorganisms to realize purification. With the increasing environmental protection standard, the requirement for effluent water quality is also more and more strict, which leads to significant increase of treatment cost. Therefore, energy saving and environmental protection have become the important concern in sewage treatment management.

[0003] A big feature of A / O biological denitrification technology is to place the denitrification process at the front end of the system, so it is also called front denitrification biological denitrification technology, and this process is widely used in denitrification treatment. Its working principle is to add an anoxic biological treatment step before the traditional aerobic activated sludge system. In the aerobic stage, nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen and return to the anoxic section; and in the anoxic stage, denitrifying bacteria use nitrate nitrogen and organic carbon in sewage for denitrification to convert nitrogen compounds into nitrogen gas, so as to achieve the purpose of simultaneously removing carbon and nitrogen. The A / O biological denitrification device in the prior art includes two main parts: denitrification reactor (A pool) and nitrification reactor (O pool). In the A pool, denitrification reaction is carried out, and in the O pool, nitrification reaction is carried out; but the reaction is complex, and how to improve the existing A / O biological denitrification technology to improve the denitrification efficiency is a technical problem to be solved in the field. SUMMARY

[0004] To solve at least one of the above technical problems, the utility model provides an A / O biological denitrification device, which comprises: water inlet tank, anaerobic tank, aerobic tank and sedimentation tank arranged in sequence.

[0005] The water inlet tank is provided with a water inlet; the anaerobic tank is provided with a first inflow port; the aerobic tank is provided with a second inflow port, and the sedimentation tank is provided with a water outlet at the upper end.

[0006] A water inlet channel is arranged between the water inlet tank and the anaerobic tank; a first reflux channel is arranged between the anaerobic tank and the aerobic tank; and a second reflux channel is arranged between the aerobic tank and the sedimentation tank.

[0007] Further, the water inlet channel comprises a water outlet arranged at the lower bottom of the water inlet tank and close to the anaerobic tank, a water inlet arranged at the lower bottom of the anaerobic tank and close to the water inlet tank, a first hose arranged between the water outlet and the water inlet, and a water inlet peristaltic pump arranged in the middle of the first hose.

[0008] Further, the first reflux channel comprises a first reflux outlet arranged at the lower bottom of the anaerobic tank and close to the aerobic tank, a second reflux outlet arranged at the lower bottom of the aerobic tank and close to the anaerobic tank, a second hose arranged between the first reflux outlet and the second reflux outlet, and a mixed liquid reflux pump arranged in the middle of the second hose.

[0009] Further, the second reflux channel comprises a third reflux outlet arranged at the bottom of the aerobic tank and close to the sedimentation tank, a fourth reflux outlet arranged at the bottom of the sedimentation tank, a third hose arranged between the third reflux outlet and the fourth reflux outlet, and a sludge reflux pump arranged in the middle of the third hose.

[0010] Further, the upper middle part of the anaerobic tank is further provided with a propeller connected with a stirring driving element.

[0011] Further, the A / O biological denitrification device further comprises an aeration assembly; the aeration assembly comprises a microporous aeration disc arranged at the lower bottom of the aerobic tank, a gas rotor flow meter and an air compression pump connected with the microporous aeration disc in sequence.

[0012] Further, the periphery of the anaerobic tank and the aerobic tank is further provided with a water bath assembly connected with a hot water circulating pump.

[0013] Further, the A / O biological denitrification device further comprises an electric control box and sensors arranged in the anaerobic tank and the aerobic tank; the sensors comprise any one or more of a PH monitor and a temperature sensor.

[0014] Further, the anaerobic tank is a cylinder; a rubber jacket is arranged at the top outer edge of the anaerobic tank, and a first inflow port is arranged at the upper top of the anaerobic tank; the aerobic tank is a cylinder, and a second inflow port is arranged at the upper top of the aerobic tank.

[0015] Further, the upper part of the sedimentation tank is a cylinder, and the lower part is a downward cone; a drainage port is arranged at the rear side of the upper part of the sedimentation tank.

[0016] The A / O biological denitrification device of the utility model aims at realizing efficient and stable operation of nitrification and denitrification, improving denitrification efficiency and total nitrogen volume load, and enhancing the capability of system stability, and is not only suitable for general industrial wastewater and domestic wastewater treatment, but also suitable for low carbon-nitrogen ratio industrial wastewater treatment, and is especially suitable for high-concentration ammonia-nitrogen wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is a structural schematic view of an embodiment of the A / O biological denitrification device;

[0018] Figure 2 It is ammonia nitrogen removal condition when ammonia nitrogen concentration is less than 100, 100-200, 200, 300mg / L respectively during continuous operation and starting of the A / O reactor;

[0019] Figure 3 It is nitrogen removal condition in the system when the nitration liquid reflux ratio is stable during operation of the A / O reactor;

[0020] Figure 4 It is nitrogen removal condition in the system when the carbon-nitrogen ratio is stable during operation of the A / O reactor;

[0021] Figure 5 It is nitrogen removal condition in the system when the temperature is stable during operation of the A / O reactor;

[0022] Figure 6 It is nitrogen removal condition in the system when the pH of the aerobic tank is stable during operation of the A / O reactor;

[0023] Figure 7 It is nitrogen removal condition in the system when the reactor is stable during operation of the A / O reactor. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0025] It should be noted that if the embodiments of the present application involve directional indications, such as up, down, left, right, front, back, etc., the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly. In addition, if the embodiments of the present application involve descriptions such as "first, second", "S1, S2", "step one, step two", etc., the descriptions are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or the number of the indicated technical features or indicating the execution order of the method, etc. Those skilled in the art can understand that any change within the technical concept of the present application without deviating from the key points of the present application should be included in the protection scope of the present application.

[0026] As Figure 1As shown, the utility model provides an A / O biological denitrification device, include: the water inlet tank 10, anaerobic tank 20 (A pool), aerobic tank 30 (O pool), sedimentation tank 40 that set up in proper order,

[0027] The water inlet tank 10 is provided with a water inlet 11; the anaerobic tank is provided with a first inflow port 21; the aerobic tank is provided with a second inflow port 31, and the sedimentation tank is provided with a drainage port 41 at the upper end;

[0028] A water inlet channel is arranged between the water inlet tank and the anaerobic tank; a first reflux channel is arranged between the anaerobic tank and the aerobic tank; and a second reflux channel is arranged between the aerobic tank and the sedimentation tank.

[0029] In this embodiment, the utility model provides an A / O biological denitrification device, 1, the first reflux channel is arranged between the anaerobic tank and the aerobic tank, and the nitrate nitrogen generated by the aerobic tank O pool is sent back to the anaerobic tank A pool through internal reflux, in this process, by adding carbon source, the denitrifying bacteria utilize these carbon source and nitrate nitrogen to carry out denitrification, thereby reducing the content of total nitrogen in sewage, so that it reaches the discharge standard; 2, increase the proportion of nitrification liquid reflux, which means that more nitrate is circulated to the anaerobic tank for denitrification reaction, thereby improving the denitrification efficiency; 3, the sedimentation tank is arranged to further purify the effluent of the drainage port, and the second reflux channel is arranged between the aerobic tank and the sedimentation tank, and the sludge is refluxed, thereby further improving the denitrification efficiency. The A / O biological denitrification device of the utility model aims to realize efficient and stable operation of nitrification and denitrification, improve the denitrification efficiency and total nitrogen volume load, and enhance the ability of system stability, which is not only suitable for general industrial wastewater and domestic wastewater treatment, but also suitable for low carbon-nitrogen ratio industrial wastewater treatment; especially suitable for the treatment of wastewater with high ammonia nitrogen concentration, and the ammonia nitrogen effluent after treatment meets the first-level discharge standard, that is, ammonia nitrogen ≤ 25 mg / L.

[0030] Specifically, the water inlet tank 10, the anaerobic tank 20, the aerobic tank 30 and the sedimentation tank 40 can adopt any structural form of the prior art, and the key of the utility model lies in the combination and optimization of structures. Preferably, the anaerobic tank 20 is a cylindrical body, a rubber jacket is arranged on the outer edge of the top of the anaerobic tank, the first inflow port 21 is arranged on the upper top of the anaerobic tank, and is preferably arranged on the right side of the upper top of the anaerobic tank; the aerobic tank is a cylindrical body, the second inflow port 31 is arranged on the upper top of the aerobic tank, and is preferably arranged on the right side of the upper top of the aerobic tank; the upper part of the sedimentation tank is a cylindrical body, and the lower part is a downward conical body; the drainage port 41 is arranged on the rear side of the upper part of the sedimentation tank.

[0031] More preferably, the water inlet channel comprises a water outlet port A arranged on the lower bottom of the water inlet tank and close to the anaerobic tank; a water inlet port B arranged on the lower bottom of the anaerobic tank and close to the water inlet tank; a first hose 51 arranged between the water outlet port and the water inlet port; and a water inlet peristaltic pump 52 arranged in the first hose.

[0032] More preferably, the first reflux channel comprises a first reflux port C arranged at the lower bottom of the anaerobic tank and close to the aerobic tank; a second reflux port D arranged at the lower bottom of the aerobic tank and close to the anaerobic tank; a second hose 61 arranged between the first reflux port and the second reflux port; and a mixed liquid reflux pump 62 arranged in the second hose.

[0033] More preferably, the second reflux channel comprises a third reflux port E arranged at the bottom of the aerobic tank and close to the sedimentation tank; a fourth reflux port F arranged at the bottom of the sedimentation tank; a third hose 71 arranged between the third reflux port and the fourth reflux port; and a sludge reflux pump 72 arranged in the third hose.

[0034] More preferably, the upper middle part of the anaerobic tank 20 is further provided with a propeller 22 connected with an external stirring driving element such as a stirring motor.

[0035] More preferably, the A / O biological denitrification device further comprises an aeration assembly; the aeration assembly comprises a microporous aeration disc 81 arranged at the lower bottom of the aerobic tank 30; and a gas rotor flow meter 82 and an air compression pump 83 connected with the microporous aeration disc in sequence. The aeration is provided by the air compression pump and connected with the gas rotor flow meter to adjust the air intake according to the measurement results.

[0036] More preferably, the periphery of the anaerobic tank and the aerobic tank is further provided with a water bath assembly 90 connected with an external hot water circulating pump.

[0037] More preferably, the A / O biological denitrification device further comprises an electric control box 100 and sensors 110 arranged in the anaerobic tank and the aerobic tank; the sensors comprise any one or more of a PH monitor and a temperature sensor; the flow of each pump is adjusted according to the detection results of the PH monitor; and the temperature of the water bath assembly is adjusted according to the temperature sensor to control the temperature in the anaerobic tank and the aerobic tank.

[0038] The A / O biological denitrification device has the following advantages:

[0039] Embodiment 1:

[0040] The A / O biological denitrification device of the utility model, before operation, first carry on microbial culture in the aerobic tank, adopt the activated sludge of the nitrification of the aeration tank of the urban sewage treatment plant, after the smothering exposure, the low ammonia nitrogen wastewater of which the ammonia nitrogen concentration of the water inlet is about 50mg / L, and through the carbon source and nitrogen source add control COD / N ratio is 5:1, wherein, the carbon source is sodium acetate, the nitrogen source is ammonium chloride, and the phosphorus source is potassium dihydrogen phosphate, adopt the operation mode of water inlet-aeration reaction-drainage, 1 day operation 1 cycle, the water exchange ratio is 1 / 3~1 / 2, when mature, the ammonia nitrogen removal rate is more than 65~70%, and the culture time needs 10~20d, then, the raw water enters the anaerobic tank through the water inlet peristaltic pump of water inlet tank, then start continuous operation by starting the mixed liquid reflux pump from the aerobic tank to the anaerobic tank and the sludge reflux pump from the sedimentation tank to the aerobic tank, the purpose is to make different functional flora adapt to water quality, then gradually increase the ammonia nitrogen concentration (keep the same carbon nitrogen ratio) according to the gradient of 50mg / L, and each concentration gradient maintains 15-20 days, then control the water temperature in the reactor to 29±1 DEG C through the water bath assembly of external hot water circulating pump, add the appropriate alkalinity to control the pH of the water inlet 8~8.5, then adjust the aeration amount through the air flow meter, maintain the dissolved oxygen DO in the anaerobic tank below 0.5mg / L, and maintain the dissolved oxygen DO in the aerobic tank above 2mg / L, reach the target process required 120~150 reaction cycles, during the period, the sign that the process runs well is that the sludge does not swell, namely, the sludge settling ratio (SV) is between 20-30, the sludge concentration is between 3-4g / L, the final effluent ammonia nitrogen is between 0-20mg / L, the effluent nitrite nitrogen is below 5mg / L, the effluent nitrate nitrogen is below 30mg / L, and the total nitrogen removal rate is between 80~95%, as shown in the table. Figure 2

[0041] The A / O biological denitrification device of the utility model adopts the above process, reduces the starting time of A / O process and enriches the abundance of denitrifying bacteria by starting the nitrification process and then starting the denitrification process, the biochemical treatment efficiency of the process is high, can realize efficient operation of nitrification and denitrification at the same time, and the denitrification effect is good, can effectively treat wastewater containing high-concentration COD and ammonia nitrogen at the same time, the operation is relatively simple, the control parameters are few, and stable operation of the process can be realized by only controlling temperature, pH, DO and reflux ratio. The nitrification process has strong low-pH adaptability, the denitrification efficiency of the process is high, the TN removal rate is 80-95%, and low C / N ratio wastewater can be effectively treated.

[0042] Example 2

[0043] ​The A / O biological denitrification device of the utility model, after starting and completing and stably running for a period of time, controls other environmental factors unchanged, through changing nitrification liquid reflux ratio (300%, 350%, 400%), carbon nitrogen ratio COD / N (4, 5), temperature (25 DEG C, 30 DEG C) and aerobic tank pH value (6.5-7, 7-7.5) in turn, analyzes the influence of different factors on the operation of nitrification denitrification system, as shown in Figures 3-6 The optimal parameters are obtained by comprehensive consideration and analysis, that is, from the perspective of energy saving and consumption reduction, the operation parameters are set as room temperature (25 DEG C), internal reflux ratio 300% to 350%, nitrification tank pH 6 to 7, and good denitrification performance can be obtained.Under the condition that the reactor stably operates, the ammonia nitrogen removal rate is about 8mgN / (L·h), and the total nitrogen removal rate is above 6mgN / (L·h).

[0044] Example 3

[0045] The A / O biological denitrification device of the utility model, after stably running for a period of time under the optimal parameter condition (stably running for more than 1 month), actual landfill leachate is obtained from a sewage treatment plant, and actual wastewater treatment is carried out for about a month, and the A / O biological denitrification device is observed, and the denitrification capacity of the A / O biological denitrification device for treating actual wastewater is observed.Under the condition that the system stably operates, the ammonia nitrogen concentration of the influent is 230-250mg / L, by maintaining the parameters of COD / N=5, internal reflux ratio 300%, room temperature (25 DEG C), dissolved oxygen (aerobic tank 2-5mg / L, anoxic tank <0.5mg / L), etc., the effluent ammonia nitrogen is almost completely removed, the total nitrogen is less than 50mg / L, the total nitrogen removal rate is >80%, the total nitrogen removal rate is >5mgN / (L·h), and the pH of the aerobic tank is >6.5.

[0046] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the description.

[0047] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. An A / O biological denitrification device, characterized in that, The application relates to an A / O biological denitrification device. The water inlet tank, the anaerobic tank, the aerobic tank and the sedimentation tank are sequentially arranged. The water inlet tank is provided with a water inlet; the anaerobic tank is provided with a first inflow port; the aerobic tank is provided with a second inflow port; and the sedimentation tank is provided with a water outlet at the upper end. A water inlet channel is arranged between the water inlet tank and the anaerobic tank; a first reflux channel is arranged between the anaerobic tank and the aerobic tank; and a second reflux channel is arranged between the aerobic tank and the sedimentation tank.

2. The A / O biological denitrification device according to claim 1, characterized in that, The water inlet channel comprises a water outlet arranged at the lower bottom of the water inlet tank and close to the anaerobic tank; a water inlet arranged at the lower bottom of the anaerobic tank and close to the water inlet tank; a first hose arranged between the water outlet and the water inlet; and a water inlet peristaltic pump arranged in the first hose.

3. The A / O biological denitrification device according to claim 2, characterized in that, The first reflux channel comprises a first reflux port arranged at the lower bottom of the anaerobic tank and close to the aerobic tank; a second reflux port arranged at the lower bottom of the aerobic tank and close to the anaerobic tank; a second hose arranged between the first reflux port and the second reflux port; and a mixed liquid reflux pump arranged in the second hose. The second reflux channel comprises a third reflux port arranged at the bottom of the aerobic tank and close to the sedimentation tank; a fourth reflux port arranged at the bottom of the sedimentation tank; a third hose arranged between the third reflux port and the fourth reflux port; and a sludge reflux pump arranged in the third hose.

4. The A / O biological denitrification device according to claim 3, characterized in that, The upper middle part of the anaerobic tank is further provided with a propeller connected with a stirring driving element. The A / O biological denitrification device further comprises an aeration assembly; the aeration assembly comprises a microporous aeration disc arranged at the lower bottom of the aerobic tank; a gas rotor flow meter and an air compression pump connected with the microporous aeration disc in sequence.

5. The A / O biological denitrification device according to claim 4, characterized in that, The periphery of the anaerobic tank and the aerobic tank is further provided with a water bath assembly connected with a hot water circulating pump.

6. The A / O biological denitrification device according to claim 5, characterized in that, The A / O biological denitrification device further comprises an electric control box and sensors arranged in the anaerobic tank and the aerobic tank; the sensors comprise any one or more of a PH monitor and a temperature sensor.

7. The A / O biological denitrification device according to claim 6, characterized in that, The anaerobic tank is a cylinder; a rubber jacket is arranged at the top outer edge of the anaerobic tank; and a first inflow port is arranged at the upper top of the anaerobic tank.

8. The A / O biological denitrification device according to claim 7, characterized in that, The aerobic tank is a cylinder; a second inflow port is arranged at the upper top of the aerobic tank.

9. The A / O biological denitrification device according to any one of claims 1-8, characterized in that, The upper part of the sedimentation tank is a cylinder; the lower part of the sedimentation tank is a downward cone; and a water outlet is arranged at the rear side of the upper part of the sedimentation tank.

10. The A / O biological denitrification device according to claim 9, characterized in that, ​

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