A high ammonia nitrogen wastewater denitrification system

Abstract

A high-ammonia-nitrogen wastewater denitrification system relates to the technical field of chemical equipment, including raw water, a regulating tank, a grease trap, a flotation tank, a first-stage aerobic bioreactor, a sedimentation tank, an anaerobic denitrification bioreactor, a second-stage aerobic bioreactor, a coagulation sedimentation tank, and a sludge dewatering tank, and the above equipment is connected in sequence through pipelines. The high-ammonia-nitrogen wastewater denitrification system completes the denitrification of high-ammonia-nitrogen wastewater with high efficiency and high quality through a series of operations including a regulating tank, a grease trap, a flotation tank, a first-stage aerobic bioreactor, a sedimentation tank, an anaerobic denitrification bioreactor, a second-stage aerobic bioreactor, and a coagulation sedimentation tank, so that the wastewater and sludge are discharged or transported after meeting the standards.

Description

Technical field:

[0001] The utility model relates to the technical field of chemical equipment, in particular to a high-ammonia nitrogen wastewater denitrification system. Background technology:

[0002] Wastewater treatment is an essential link. Wastewater with high ammonia nitrogen is easily produced in chemical production. Wastewater denitrification is the process of denitrifying wastewater to prevent eutrophication of water bodies. It is divided into two methods: physical and chemical method and biological denitrification method. Most of the biological denitrification methods adopt nitrification-denitrification, that is, firstly, nitrifying bacteria in wastewater are used to oxidize nitrogen compounds into nitrates under aerobic conditions (nitrification stage), and then under anaerobic conditions (dissolved oxygen is less than 0.5 mg / L), denitrifying bacteria in wastewater are used to reduce nitrates into gaseous nitrogen and other final gas products and release them into the atmosphere (denitrification stage). However, the existing denitrification system is not effective, which affects the discharge of wastewater. Utility model content:

[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a high-ammonia nitrogen wastewater denitrification system, which can complete the work of high-ammonia nitrogen wastewater denitrification with high efficiency and high quality.

[0004] In order to solve the problems existing in the background technology, the utility model adopts the following technical scheme: it includes raw water, a first-stage aerobic bioreactor, a second-stage aerobic bioreactor and an anaerobic denitrification bioreactor, the raw water is connected to a regulating tank through a pipeline, the regulating tank is connected to a grease trap through a pipeline, the grease trap is connected to a flotation tank through a pipeline, the flotation tank is connected to a first-stage aerobic bioreactor through a pipeline, the first-stage aerobic bioreactor is connected to a sedimentation tank through a pipeline, the sedimentation tank is respectively connected to an anaerobic denitrification bioreactor and a sludge dewatering tank through pipelines, the anaerobic denitrification bioreactor is connected to a second-stage aerobic bioreactor through a pipeline, the second-stage aerobic bioreactor is connected to a coagulation sedimentation tank through a pipeline, the coagulation sedimentation tank is connected to effluent through a pipeline, the sludge precipitated from the coagulation sedimentation tank is connected to the sludge dewatering tank through a sludge discharge pipe, the sludge dewatering tank is connected to a sludge concentrator through a pipeline, and the sludge concentrator is connected to mud cake transportation through a pipeline.

[0005] The one-stage aerobic bioreactor and the two-stage aerobic bioreactor are connected to the one-stage aeration and the two-stage aeration respectively through pipelines.

[0006] The sludge precipitated from the sedimentation tank is connected to a section of an aerobic bioreactor through sludge reflux.

[0007] The coagulation sedimentation tank is connected with the dosing tank through a pipeline.

[0008] The beneficial effects of the utility model are safety and reliability. Through a series of operations including a regulating tank, a grease trap, a flotation tank, a first-stage aerobic bioreactor, a sedimentation tank, an anaerobic denitrification bioreactor, a second-stage aerobic bioreactor and a coagulation sedimentation tank, the denitrification of high-ammonia nitrogen wastewater is completed with high efficiency and high quality, so that the wastewater and sludge are discharged or transported after meeting the standards. Description of the drawings:

[0009] Figure 1 It is a schematic diagram of the structure of the utility model. Specific implementation method:

[0010] Reference Figure 1 The utility model specifically adopts the following implementation mode: including raw water, a first-stage aerobic bioreactor, a second-stage aerobic bioreactor and an anaerobic denitrification bioreactor, the raw water is connected to a regulating tank through a pipeline, the regulating tank is connected to a grease trap through a pipeline, the grease trap is connected to a flotation tank through a pipeline, the flotation tank is connected to a first-stage aerobic bioreactor through a pipeline, the first-stage aerobic bioreactor is connected to a sedimentation tank through a pipeline, the sedimentation tank is respectively connected to an anaerobic denitrification bioreactor and a sludge dewatering tank through pipelines, the anaerobic denitrification bioreactor is connected to a second-stage aerobic bioreactor through a pipeline, the second-stage aerobic bioreactor is connected to a coagulation sedimentation tank through a pipeline, the coagulation sedimentation tank is connected to the effluent through a pipeline, the sludge precipitated from the coagulation sedimentation tank is connected to the sludge dewatering tank through a sludge discharge pipe, the sludge dewatering tank is connected to a sludge concentrator through a pipeline, and the sludge concentrator is connected to mud cake transportation through a pipeline. The first-stage aerobic bioreactor and the second-stage aerobic bioreactor are respectively connected to the first-stage aeration and the second-stage aeration through pipelines. The sludge precipitated from the sedimentation tank is connected to a section of an aerobic bioreactor through sludge return. The coagulation sedimentation tank is connected to the dosing agent through a pipeline.

[0011] This high ammonia nitrogen wastewater denitrification system adopts the biological denitrification method. Biological denitrification is the process of converting organic nitrogen and ammonia nitrogen into N2 and N20 gas under the action of microorganisms. It includes two reaction processes: nitrification and denitrification.

[0012] The nitrification reaction is carried out under aerobic conditions, that is, through a first-stage aerobic bioreactor and a second-stage aerobic bioreactor, to convert NH 4+ Converted to NO 2- and NO 3- This process is accomplished by two bacteria, nitrite bacteria and nitrate bacteria. These two bacteria are chemoautotrophic microorganisms. The reaction is: NH 4+ +2O2=NO 3- +2H + +H2O.

[0013] Nitrifying bacteria are chemoautotrophic bacteria with low growth rate and are sensitive to changes in environmental conditions. Temperature, dissolved oxygen, sludge age, pH, organic load, etc. will have an impact on it.

[0014] The suitable temperature for nitrification reaction is 20℃~30℃. When it is lower than 15℃, the reaction rate drops rapidly, and the reaction almost stops completely at 5℃. Since nitrifying bacteria are autotrophic bacteria, if the BOD5 value in the water is too high, it will contribute to the rapid proliferation of anaerobic bacteria and the proportion of nitrifying bacteria in microorganisms will decrease. The growth generation cycle of nitrifying bacteria is relatively long. In order to ensure the progress of nitrification, the sludge age should be more than twice the minimum generation time of nitrifying bacteria. The nitrification reaction has high requirements for dissolved oxygen, and the dissolved oxygen content in the treatment system is best maintained above 2mg / L. In addition, during the nitrification reaction, there is H + The nitrifying bacteria are very sensitive to the pH value. In order to maintain a suitable pH value of 7-8, that is, to complete the pH adjustment through the regulating tank, sufficient alkalinity should be maintained in the wastewater to adjust the pH value.

[0015] Denitrification is a process in which denitrifying bacteria convert nitrate nitrogen (NO 3- ) and nitrite nitrogen NO 2- ) is reduced to nitrogen. The reaction is: 6NO 3- +5CH3OH=5CO2+3N2+7H2O+6OH - .

[0016] Denitrifying bacteria are heterotrophic facultative anaerobic bacteria. In the presence of oxygen, they use O2 as an electron acceptor for aerobic respiration. 3- or N0 2- If it exists, then N0 3- or N0 2- It is used as electron acceptor and denitrification reaction is carried out with organic carbon as electron donor and nutrient source.

[0017] Since the denitrification section is set after the organic matter oxidation and nitrification section, it mainly relies on endogenous respiratory carbon sources for denitrification, which is very inefficient. Therefore, an external carbon source must be added to the denitrification section to ensure efficient and stable denitrification reaction. With the deepening of the understanding of the nitrification reaction mechanism, organic matter oxidation and nitrification are combined into one system to simplify the process, thus adopting a two-stage aerobic biological denitrification process has become a reality. Each section also has its own sedimentation and sludge return system, as well as a sedimentation tank and a coagulation sedimentation tank.

[0018] The first stage uses organic matter in the raw water as a carbon source and a mixed liquid containing nitrate nitrogen from the sludge return in the first stage aerobic bioreactor for denitrification. After the first stage of treatment, denitrification has been basically completed. In order to further improve the denitrification efficiency, the wastewater enters the anaerobic denitrification bioreactor to complete the denitrification reaction, and then enters the second stage aerobic bioreactor to use the endogenous respiratory carbon source for denitrification. The last stage aeration and the second stage aeration are used to blow nitrogen from the wastewater in the corresponding aerobic bioreactor, improve the sedimentation performance of the sludge, and prevent the sludge from floating in the coagulation sedimentation tank.

[0019] The grease trap is used to scrape off the grease mixed in the raw water. After layers of denitrification, the water produced after denitrification is discharged through the effluent, and the sludge produced enters the sludge dewatering tank for the final dehydration. The dehydrated sludge enters the sludge concentrator and is compressed into mud cake, which is finally transported out.

[0020] In summary, this high-ammonia-nitrogen wastewater denitrification system is safe and reliable. Through a series of operations including the regulating tank, oil separator, flotation tank, first-stage aerobic bioreactor, sedimentation tank, anaerobic denitrification bioreactor, second-stage aerobic bioreactor and coagulation sedimentation tank, it can efficiently and high-quality complete the denitrification of high-ammonia-nitrogen wastewater, so that the wastewater and sludge are discharged or transported after meeting the standards.

Claims

1. A high-ammonia nitrogen wastewater denitrification system, comprising raw water, a first-stage aerobic bioreactor, a second-stage aerobic bioreactor and an anaerobic denitrification bioreactor, wherein the raw water is connected to a regulating tank through a pipeline, the regulating tank is connected to a grease trap through a pipeline, the grease trap is connected to a flotation tank through a pipeline, the flotation tank is connected to a first-stage aerobic bioreactor through a pipeline, the first-stage aerobic bioreactor is connected to a sedimentation tank through a pipeline, the sedimentation tank is respectively connected to an anaerobic denitrification bioreactor and a sludge dewatering tank through pipelines, the anaerobic denitrification bioreactor is connected to a second-stage aerobic bioreactor through a pipeline, the second-stage aerobic bioreactor is connected to a coagulation sedimentation tank through a pipeline, the coagulation sedimentation tank is connected to effluent through a pipeline, the sludge precipitated from the coagulation sedimentation tank is connected to the sludge dewatering tank through a sludge discharge pipe, the sludge dewatering tank is connected to a sludge concentrator through a pipeline, and the sludge concentrator is connected to mud cake transportation through a pipeline.

2. A high ammonia nitrogen wastewater denitrification system according to claim 1, characterized in that: The one-stage aerobic bioreactor and the two-stage aerobic bioreactor are connected to the one-stage aeration and the two-stage aeration respectively through pipelines.

3. A high ammonia nitrogen wastewater denitrification system according to claim 1, characterized in that: The sludge precipitated from the sedimentation tank is connected to a section of an aerobic bioreactor through sludge reflux.

4. A high-ammonia nitrogen wastewater denitrification system according to claim 1, characterized in that: The coagulation sedimentation tank is connected with the dosing tank through a pipeline.

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