CN117247153B - Device for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia nitrogen wastewater and application method thereof - Google Patents
Device for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia nitrogen wastewater and application method thereofInfo
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- CN117247153B CN117247153B CN202311444474.0A CN202311444474A CN117247153B CN 117247153 B CN117247153 B CN 117247153B CN 202311444474 A CN202311444474 A CN 202311444474A CN 117247153 B CN117247153 B CN 117247153B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
本发明涉及废水处理技术领域，具体涉及一种用于低氨氮废水短程硝化‑厌氧氨氧化处理的装置，以及利用该装置进行低氨氮废水短程硝化‑厌氧氨氧化处理的方法。该装置包括反应池以及基于反应池设置的间歇曝气系统和硫离子缓释系统，其中，间歇曝气系统能够通过预设的间歇曝气程序来控制溶解氧浓度发生交替变化，从而实现对NOB的抑制；而硫离子缓释系统通过硫离子缓释悬浮球释放硫离子对NOB进行长期抑制，因此，该装置能够通过两种抑制方式的耦合对不同生长特性的NOB进行抑制，避免单一的抑制方式使得某些种类的NOB对环境条件产生适应性而失去抑制效果，从而实现低氨氮废水短程硝化‑厌氧氨氧化的快速启动和长期稳定运行。
This invention relates to the field of wastewater treatment technology, specifically to an apparatus for short-cut nitrification-anaerobic ammonia oxidation (NMO) treatment of low-ammonia nitrogen wastewater, and a method for using this apparatus for such treatment. The apparatus includes a reaction tank and an intermittent aeration system and a sulfide ion slow-release system based on the reaction tank. The intermittent aeration system controls the alternating changes in dissolved oxygen concentration through a preset intermittent aeration program, thereby suppressing NOB. The sulfide ion slow-release system releases sulfide ions through sulfide ion slow-release suspended balls to provide long-term suppression of NOB. Therefore, this apparatus can suppress NOB with different growth characteristics through the coupling of two suppression methods, avoiding the loss of suppression effect due to the adaptation of certain types of NOB to environmental conditions by a single suppression method. This achieves rapid start-up and long-term stable operation of the short-cut nitrification-anaerobic ammonia oxidation process for low-ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a device for low ammonia nitrogen wastewater short-cut nitrification-anaerobic ammonia oxidation treatment and a method for performing the low ammonia nitrogen wastewater short-cut nitrification-anaerobic ammonia oxidation treatment by using the device.
Background
The short-cut nitrification-anaerobic ammonia oxidation denitrification process has the advantages of low aeration energy consumption, no need of additional carbon source, low sludge yield, small occupied area of structures and the like, and has become a green low-carbon sewage treatment technology with great application prospect. Nevertheless, the process still cannot realize large-scale application, particularly application in the main stream low ammonia nitrogen urban wastewater treatment, mainly because the conversion process of nitrite to nitrate is difficult to control in the actual treatment process, stable nitrite accumulation cannot be ensured, namely short-cut nitrification is difficult to realize, and the follow-up process is influenced.
At present, the main method for realizing short-cut nitrification is to create environmental conditions which are unfavorable for the growth of Nitrite Oxidizing Bacteria (NOB) through the modes of hydraulic parameter adjustment or inhibitor addition and the like such as high Free Ammonia (FA), high Free Nitrous Acid (FNA), medium temperature, low Dissolved Oxygen (DO), low sludge age (SRT), intermittent aeration and the like, so as to realize the accumulation of nitrite. However, in actual use, urban sewage generally does not have medium-temperature, high-concentration FA, FNA and other conditions, so that continuous low-oxygen aeration, intermittent aeration and other strategies become common methods for realizing short-cut nitrification.
However, the inventors found that continuous low oxygen aeration and intermittent aeration strategies are difficult to achieve long-term NOB inhibition, have poor inhibition effects, and require a longer time for short-cut nitrification start-up in such inhibition. NOB bacteria have rich population structures and various growth characteristics, and the research of the Uygur autonomous system, the Uygur autonomous system and the like shows that certain dominant populations can gradually adapt to a long-term oxygen inhibition environment through population replacement, and Nitrospira bacteria and the like with better DO affinity are pertinently enriched, so that the stability of AOB and NOB selective inhibition under a long-term low DO continuous aeration strategy is not facilitated. In addition, the study on intermittent aeration shows that too low DO concentration in the aeration stage easily results in poor aerobic-lack alternate environment, so that NOB bacteria with strong DO affinity in the low DO environment are adaptive to the environment, while too high DO concentration in the aeration stage can accelerate recovery of NOB activity despite realizing good aerobic-lack alternate environment.
The chemical inhibitor is added to inhibit NOB enzyme activity to realize quick start and stable operation of short-cut nitrification. The related literature reports that short-cut nitrification can be started quickly by adding inhibitors such as parachlorometaxylenol, chlorate and hydroxylamine, but the method realizes the inhibition of NOB by directly adding an inhibitor solution with a certain concentration into a reactor, on the one hand, the substances have limited time for acting in the reactor, so frequent addition is needed, and in addition, most of the chemical agents have certain biotoxicity, cannot be effectively utilized and are decomposed, and the inhibitor is directly discharged into a receiving water body, so that not only is the waste of resources formed, but also the adverse effect on the ecological environment is caused. In summary, none of these inhibitors are suitable for large scale production.
Disclosure of Invention
In view of the above, the present invention provides a device for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater, and a method for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater using the same, so as to solve the problems of poor inhibition effect and long short-cut nitrification starting time existing in the prior art when NOB is inhibited by continuous low oxygen aeration and intermittent aeration strategies.
In a first aspect, the invention provides a device for short-cut nitrification-anaerobic ammonia oxidation treatment of low ammonia nitrogen wastewater, which comprises a reaction tank, and an intermittent aeration system and a sulfur ion slow release system which are arranged based on the reaction tank,
The intermittent aeration system can be used for introducing air into the reaction tank according to a preset aeration program, and the preset aeration program comprises a low-frequency aeration-stop aeration-high-frequency aeration-stop aeration program which is repeatedly executed;
The sulfur ion slow release system can reciprocate in the reaction tank and continuously release sulfur ions into the reaction tank.
The device provided by the invention comprises a reaction tank, and an intermittent aeration system and a sulfur ion slow-release system which are arranged based on the reaction tank, wherein the intermittent aeration system can control the concentration of dissolved oxygen to change alternately through a preset intermittent aeration program, so that NOB is inhibited, and the sulfur ion slow-release system inhibits NOB for a long time through releasing sulfur ions by a sulfur ion slow-release suspension ball, so that the device can inhibit NOB with different growth characteristics through coupling of two inhibition modes, and the phenomenon that a single inhibition mode enables certain NOB to adapt to environmental conditions and lose inhibition effect is avoided, so that the rapid start and long-term stable operation of short-cut nitrification-anaerobic ammonia oxidation of low ammonia nitrogen wastewater are realized.
In an alternative embodiment, the device further comprises a controller, wherein the controller is respectively connected with the intermittent aeration system and the sulfur ion slow release system;
the controller can instruct the intermittent aeration system to introduce air into the reaction tank according to the preset aeration program;
and/or the controller can instruct the sulfur ion slow-release system to reciprocate in the reaction tank according to a preset moving program.
In an alternative implementation mode, when the intermittent aeration system is used for introducing air into the reaction tank according to the preset aeration program, the duration of a low-frequency aeration stage is controlled to be 15-20 min, the dissolved oxygen content in the reactor in the low-frequency aeration stage is controlled to be 0.3-0.5 mg/L by regulating and controlling the aeration frequency, and the intermittent aeration system enters a stop aeration stage when the dissolved oxygen content in the reactor is higher than 0.5 mg/L;
And/or controlling the duration of stopping the aeration stage to be 10-15 min;
And/or controlling the duration of the high-frequency aeration stage to be 5-10 min, controlling the dissolved oxygen content in the reactor to be 0.8-1.2 mg/L by controlling the aeration frequency, and entering the aeration stopping stage when the dissolved oxygen content in the reactor is higher than 1.2 mg/L.
In an alternative embodiment, the intermittent aeration system comprises an air inlet pump, an air inlet pipe, an air distribution device and a flowmeter;
the air inlet pump is connected with the controller and is used for introducing air into the reaction tank according to the preset aeration program based on the indication of the controller;
and/or the air inlet pump, the air inlet pipe and the air distribution device are sequentially communicated, the flowmeter is arranged on the air inlet pipe, and the air distribution device is arranged in the reaction tank.
In an alternative embodiment, the sulfur ion sustained release system comprises a movable supporting frame, a driving device and at least one sulfur ion sustained release suspending ball, wherein,
The driving device is connected with the controller and is used for driving the movable supporting frame to reciprocate in the reaction tank according to the preset moving program based on the indication of the controller;
And/or at least one sulfur ion slow-release suspending ball is hung on the movable supporting frame in a string shape and extends into the reaction tank;
Optionally, the filling rate of the sulfide ion slow-release suspending ball in the reaction tank is 40-60%.
In an alternative embodiment, the sulfur ion slow release suspending ball comprises a porous hollow ball and a slow release filler filled in the porous hollow ball, wherein the slow release filler comprises sulfide, sponge iron, foaming agent, binder and pH buffering agent.
In an alternative embodiment, the diameter of the porous hollow sphere is 6-8 cm, and the surface pore diameter is 5-8 mm.
In an alternative embodiment, the weight percentage of the sulfide is 45-55%, the weight percentage of the sponge iron is 10-15%, the weight percentage of the foaming agent is 10-15%, the weight percentage of the binder is 12-18%, and the weight percentage of the pH buffering agent is 6-10% based on the total weight of the slow release filler.
In an alternative embodiment, the sulfide includes at least one of sodium sulfide nonahydrate, ammonium sulfide, potassium sulfide, calcium sulfide, and magnesium sulfide;
and/or the foaming agent comprises at least one of calcium carbonate, magnesium carbonate and ammonium bicarbonate;
and/or the binder comprises sodium alginate and/or polyvinyl alcohol, preferably the binder is a combination of sodium alginate and polyvinyl alcohol;
and/or the pH buffer comprises calcium carbonate and/or magnesium carbonate, preferably the pH buffer is a combination of calcium carbonate and magnesium carbonate.
In an alternative embodiment, the driving device drives the movable support frame to reciprocate in the reaction tank according to the preset moving program, and the method includes:
under the condition that the intermittent aeration system performs low-frequency aeration, the driving device drives the movable supporting frame to reciprocate in the reaction tank at a moving speed of 5-10 m/min;
Under the condition that the intermittent aeration system stops aeration, the driving device drives the movable supporting frame to reciprocate in the reaction tank at a moving speed of 10-20 m/min;
under the condition that the intermittent aeration system performs high-frequency aeration, the driving device drives the movable supporting frame to reciprocate in the reaction tank at a moving speed of 5-10 m/min.
In a second aspect, the invention provides a method for performing short-cut nitrification-anaerobic ammonia oxidation treatment on low ammonia nitrogen wastewater by using the device, which comprises the following steps:
(1) Preparation before treatment:
The low ammonia nitrogen wastewater is connected into the reaction tank, and secondary sedimentation tank residual sludge is connected in parallel;
(2) Short-cut nitrification starting:
Introducing air into the reaction tank by using the intermittent aeration system according to the preset aeration program, and simultaneously enabling the sulfur ion slow-release system to reciprocate in the reaction tank and continuously release sulfur ions until the nitrite ion accumulation rate in the effluent of the reaction tank is not lower than 90%, so as to determine that the short-cut nitrification is successfully started;
(3) Short-cut nitrification-anaerobic ammonia oxidation start-up:
after the short-cut nitrification operation is stable, discharging part of short-cut nitrification sludge from the reaction tank, and adding anaerobic ammonia oxidation sludge, wherein under the condition that TN removal rate in the reaction tank reaches more than 80%, the short-cut nitrification-anaerobic ammonia oxidation is successfully started;
(4) Treatment of low ammonia nitrogen wastewater:
Inoculating sulfur-iron autotrophic denitrification sludge into the reaction tank after the operation of short-cut nitrification-anaerobic ammonia oxidation is stable, and starting to treat the low ammonia nitrogen wastewater under the conditions that TN removal rate in the reaction tank reaches more than 85 percent and the detection rate of sulfur ions in effluent of the reaction tank is 0.
In an alternative embodiment, after the secondary sedimentation tank excess sludge is inoculated in the preparation step before treatment, the concentration of the activated sludge in the reaction tank is 4-5 mg/L.
In an optional implementation manner, in the shortcut nitrification-anaerobic ammonia oxidation starting step, the partial shortcut nitrification sludge is discharged so that the concentration of the activated sludge in the reaction tank is 2-3 mg/L, and the anaerobic ammonia oxidation sludge is added so that the concentration ratio of the shortcut nitrification sludge to the anaerobic ammonia oxidation sludge is 1 (1-1.25).
In an alternative embodiment, in the step of treating the low ammonia nitrogen wastewater, the sulfur-iron autotrophic denitrification sludge is inoculated into the reaction tank so that the weight of the sulfur-iron autotrophic denitrification sludge is 8-12% of the total weight of the sludge in the reaction tank.
In a third aspect, the invention provides the use of the device in the short-cut nitrification-anaerobic ammonia oxidation treatment of low ammonia nitrogen wastewater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view schematically showing an apparatus for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater according to the present invention;
FIG. 2 is a schematic plan view schematically showing an apparatus for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater according to the present invention;
FIG. 3 illustrates a top view (left) and a side view (right) of an apparatus for short-cut nitrification-anaerobic ammonia oxidation treatment of low-ammonia-nitrogen wastewater according to the present invention;
fig. 4 schematically illustrates a structure of a driving device and a movable supporting frame in an embodiment of the present invention;
fig. 5 schematically illustrates a structure of a sulfur ion sustained-release suspension ball according to an embodiment of the present invention.
Reference numerals illustrate:
0. The device comprises a reaction tank, a water inlet and outlet system, a 2-intermittent aeration system, a 3-controller, a 4-sulfur ion slow-release system, a 5-driving device, a 1.1-water inlet pipe, a 1.2-water inlet pump, a 1.3-water distribution device, a 1.4-water outlet pipe, a 1.5-mud discharging pipe, a 2.1-air inlet pump, a 2.2-flowmeter, a 2.3-air inlet pipe, a 2.4-air distribution device, a 4.1-sulfur ion slow-release suspension ball, a 4.1.1-suspension ball upper shell, a 4.1.2-suspension ball inner slow-release filler, a 4.1.3-suspension ball lower shell, a 4.2-movable supporting frame, a 4.3-dissolved oxygen online monitor, a 4.4-pH online detector, a 5.1-speed reducing motor, a 5.2-driving sprocket, a 5.3-driving sprocket, a driving shaft, a 5.4-driven sprocket, a 5.5-walking track, a 5.6-walking wheel.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
The reason why the NOB is inhibited by the low DO control and intermittent aeration strategies in the related art and the short-cut nitrification starting time is long is that (1) the NOB is in a low-oxygen environment for a long time, the NOB can gradually adapt to the long-time low-oxygen inhibition environment through dominant population replacement, and a plurality of Nitrospira bacteria with better DO affinity are pertinently enriched, so that the inhibition effect is weakened or even invalid, (2) under the conventional intermittent aeration strategy, because the NOB bacteria have rich population structures and various growth characteristics, different NOB bacteria have different affinities for oxygen, for example, among NOB bacteria commonly found in activated sludge, nitrospira bacteria which prefer the low DO environment are poor in adaptability to the suddenly turned high DO environment, the Nitrospira bacteria are easier to adapt to the high-intermittent aeration condition, the existing intermittent aeration mode is single, the inhibition of different types of NOB is difficult to be realized, and (3) the NOB is inhibited by adopting only the low DO control and the intermittent aeration strategies, the NOB is easy to generate adaptability, so that the activity is recovered, and the NOB is difficult to maintain in a weak-intermittent inhibition state for a system for a long time.
In order to solve the problems in the related art described above, according to a first aspect of the present invention, there is provided an apparatus for short-cut nitrification-anaerobic ammonia oxidation treatment of low ammonia-nitrogen wastewater. Wherein fig. 1 schematically shows a schematic perspective view of an apparatus for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater according to the present invention, fig. 2 schematically shows a schematic plan view of an apparatus for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater according to the present invention, and fig. 3 schematically shows a plan view (left) and a side view (right) of an apparatus for short-cut nitrification-anaerobic ammoxidation treatment of low ammonia-nitrogen wastewater according to the present invention. As shown in fig. 1 to 3, the apparatus comprises a reaction tank 0, and an intermittent aeration system 2 and a sulfur ion slow release system 4 which are arranged based on the reaction tank 0, wherein,
The intermittent aeration system 2 can introduce air into the reaction tank 0 according to a preset aeration program, wherein the preset aeration program comprises a low-frequency aeration-stop aeration-high-frequency aeration-stop aeration program which is repeatedly executed;
the sulfur ion slow release system 4 can reciprocate in the reaction tank 0 and continuously release sulfur ions into the reaction tank 0.
The device provided by the invention comprises a reaction tank, and an intermittent aeration system and a sulfur ion slow-release system which are arranged based on the reaction tank, wherein the intermittent aeration system can control the concentration of dissolved oxygen to change alternately through a preset intermittent aeration program, so that NOB is inhibited, and the sulfur ion slow-release system inhibits NOB for a long time through releasing sulfur ions by a sulfur ion slow-release suspension ball, so that the device can inhibit NOB with different growth characteristics through coupling of two inhibition modes, and the phenomenon that a single inhibition mode enables certain NOB to adapt to environmental conditions and lose inhibition effect is avoided, so that the rapid start and long-term stable operation of short-cut nitrification-anaerobic ammonia oxidation of low ammonia nitrogen wastewater are realized.
In addition, the device can realize a new intermittent aeration mode, through the intermittent aeration of hypoxia-anoxia-hypoxia-anoxia, NOB with different DO affinities can be inhibited, the effectiveness and the long-term performance of NOB inhibition can be obviously improved, and the stability of a short-range nitration system is further improved.
In an alternative embodiment, the device further comprises a controller 3, wherein the controller 3 is respectively connected with the intermittent aeration system 2 and the sulfur ion slow release system 4;
The controller 3 can instruct the intermittent aeration system 2 to introduce air into the reaction tank 0 according to the preset aeration program;
And/or the controller 3 can instruct the sulfur ion sustained release system 4 to reciprocate in the reaction tank 0 according to a preset moving program.
In an alternative implementation mode, when the intermittent aeration system is used for introducing air into the reaction tank according to the preset aeration program, the duration of a low-frequency aeration stage is controlled to be 15-20 min, the dissolved oxygen content in the reactor in the low-frequency aeration stage is controlled to be 0.3-0.5 mg/L by regulating and controlling the aeration frequency, and the intermittent aeration system enters a stop aeration stage when the dissolved oxygen content in the reactor is higher than 0.5 mg/L;
And/or controlling the duration of stopping the aeration stage to be 10-15 min;
And/or controlling the duration of the high-frequency aeration stage to be 5-10 min, controlling the dissolved oxygen content in the reactor to be 0.8-1.2 mg/L by controlling the aeration frequency, and entering the aeration stopping stage when the dissolved oxygen content in the reactor is higher than 1.2 mg/L.
In an alternative embodiment, the intermittent aeration system 2 comprises an air inlet pump 2.1, an air inlet pipe 2.3, an air distribution device 2.4 and a flowmeter 2.2;
The air inlet pump 2.1 is connected with the controller 3 and is used for introducing air into the reaction tank 0 according to the preset aeration program based on the instruction of the controller 3;
and/or, the air inlet pump 2.1, the air inlet pipe 2.3 and the air distribution device 2.4 are sequentially communicated, the flowmeter 2.2 is arranged on the air inlet pipe 2.3, and the air distribution device 2.4 is arranged in the reaction tank 0.
In an alternative embodiment, the sulfur ion sustained release system 4 comprises a movable supporting frame 4.2, a driving device 5 and at least one sulfur ion sustained release suspending ball 4.1, wherein,
The driving device 5 is connected with the controller 3 and is used for driving the movable supporting frame 4.2 to reciprocate in the reaction tank 0 according to the preset moving program based on the instruction of the controller 3;
and/or at least one sulfur ion slow-release suspending ball 4.1 is hung on the movable supporting frame 4.2 in a string shape and extends into the reaction tank 0;
Optionally, the filling rate of the sulfide ion slow-release suspending ball 4.1 in the reaction tank 0 is 40-60%.
In the device provided by the invention, the sulfur ion slow-release system comprises the movable supporting frame, the driving device and at least one sulfur ion slow-release suspending ball, wherein the driving device can drive the movable supporting frame to move, so that the movable supporting frame can serve as a stirring device, and the uniform mixing of activated sludge and wastewater in the aeration stopping stage is realized through the left and right movement of the frame.
In an alternative embodiment, the sulfur ion sustained release system 4 further comprises an on-line dissolved oxygen monitor 4.3 and an on-line pH detector 4.4. The sulfur ion slow release suspending ball 4.1 is fixed on the movable supporting frame 4.2 through a rope, and the upper end of the movable supporting frame 4.2 is connected with the driving device 5.
Fig. 4 schematically shows a structure of a driving device and a movable supporting frame in an embodiment of the present invention. As shown in fig. 4, the driving device 5 comprises a gear motor 5.1, a driving sprocket 5.2, a driving shaft 5.3, a driven sprocket 5.4, a walking rail 5.5 and a walking wheel 5.6. The driving device 5 is realized in such a way that a gear motor 5.1 is slowly started in a frequency conversion mode under the indication of a controller 3, the gear motor 5.1 drives a driving chain wheel 5.2 to rotate, the driving chain wheel 5.2 drives a driving shaft 5.3 and travelling wheels 5.6 to rotate, and driven chain wheels 5.4 are arranged on the driving shaft 5.3, so that power is transmitted to a second group of rotating shafts, a third group of rotating shafts, a fourth group of rotating shafts and a fifth group of travelling wheels 5.6, all travelling wheels 5.6 are finally realized to synchronously rotate and travel, each travelling wheel is provided with a middle groove and a rim, the middle groove just clamps a travelling rail 5.5 so as to prevent the rim from moving, the whole movable supporting frame 4.2 is driven by the gear motor 5.1 to travel along the rail, and meanwhile, the sulfur ion slow-release suspending balls 4.1 below are driven to move left and right.
In an alternative embodiment, the sulfur ion slow release suspending ball 4.1 comprises a porous hollow ball (4.1.1+4.1.3) and a slow release filler 4.1.2 filled in the porous hollow ball, wherein the slow release filler comprises sulfide, sponge iron, foaming agent, binder and pH buffering agent. Fig. 5 schematically illustrates a structure of a sulfur ion sustained-release suspension ball according to an embodiment of the present invention.
In an alternative embodiment, the diameter of the porous hollow sphere is 6-8 cm, and the surface pore diameter is 5-8 mm. Further, the material of the porous hollow sphere may be selected within a certain range, and illustratively, the material of the porous hollow sphere may be polyethylene.
In the device provided by the invention, the sulfur ion slow-release suspending ball comprises the porous hollow ball and the slow-release filler filled in the porous hollow ball, the suspending ball can slowly release sulfur ions, continuously provide sulfur ions for a short-cut nitrification system to inhibit NOB activity, realize quick start and stable operation of the short-cut nitrification system, avoid frequent addition of inhibitors, simultaneously, the embedded S 2- acts on microorganisms in a water body in a heterogeneous mode, compared with a homogeneous action mode of directly adding an S 2- aqueous solution, the heterogeneous action mode can obviously reduce the usage amount of sulfides, and S 2- can also be used as an electron acceptor of sulfur autotrophic denitrifying bacteria to participate in denitrification reaction, and finally generate SO 4 2- to be discharged into the water body.
In addition, the slow-release filler of the sulfur ion slow-release suspending ball also contains sponge iron, so that under the condition of not affecting the slow release of S 2-, the sponge iron can be used as an oxygen buffer to reduce the oxidation of oxygen in a system to S 2-, and can be used as an electron acceptor of certain autotrophic microorganisms to participate in the sulfur autotrophic denitrification reaction, and Fe 2+ generated in the reaction process can be used as a phosphorus precipitator to remove part of soluble phosphorus in a water body.
In an alternative embodiment, the weight percentage of the sulfide is 45-55%, the weight percentage of the sponge iron is 10-15%, the weight percentage of the foaming agent is 10-15%, the weight percentage of the binder is 12-18%, and the weight percentage of the pH buffering agent is 6-10% based on the total weight of the slow release filler.
In an alternative embodiment, the sulfide includes at least one of sodium sulfide nonahydrate, ammonium sulfide, potassium sulfide, calcium sulfide, and magnesium sulfide;
and/or the foaming agent comprises at least one of calcium carbonate, magnesium carbonate and ammonium bicarbonate;
and/or the binder comprises sodium alginate and/or polyvinyl alcohol, preferably the binder is a combination of sodium alginate and polyvinyl alcohol;
and/or the pH buffer comprises calcium carbonate and/or magnesium carbonate, preferably the pH buffer is a combination of calcium carbonate and magnesium carbonate.
The preparation method of the sulfur ion slow-release suspending ball can be selected in a certain range, and the sulfur ion slow-release suspending ball can be prepared by the following method:
① The method comprises the steps of respectively weighing sulfide, sponge iron, foaming agent and pH buffering agent, grinding the materials into powder with the particle sizes of 100-150 meshes, 100-200 meshes and 50-100 meshes, weighing binder by ②, dissolving the binder to prepare aqueous solution with the mass concentration of 4-5%, mixing the grinding powder by ③, adding the aqueous solution of the binder into the mixed powder, stirring and mixing uniformly, granulating and forming to obtain filler particles, placing the formed filler into a calcium chloride solution with the mass concentration of 2-3%, soaking for 6h, drying the filler particles in vacuum for 8-10 h by ④, cooling at the temperature of 120-140 ℃ in vacuum, and obtaining sulfide slow-release filler with the particle size of 10-12 mm, wherein the slow-release filler is filled into porous hollow spheres by ⑤.
In an alternative embodiment, the driving device 5 drives the movable support frame 4.2 to reciprocate in the reaction tank 0 according to the preset moving program, including:
Under the condition that the intermittent aeration system 2 performs the low-frequency aeration, the driving device 5 drives the movable supporting frame 4.2 to reciprocate in the reaction tank 0 at a moving speed of 5-10 m/min;
under the condition that the intermittent aeration system 2 stops aeration, the driving device 5 drives the movable supporting frame 4.2 to reciprocate in the reaction tank 0 at a moving speed of 10-20 m/min;
Under the condition that the intermittent aeration system 2 performs the high-frequency aeration, the driving device 5 drives the movable supporting frame 4.2 to reciprocate in the reaction tank 0 at a moving speed of 5-10 m/min.
In an alternative embodiment, the device further comprises a water inlet and outlet system 1, wherein the water inlet and outlet system 1 comprises a water inlet pipe 1.1, a water inlet pump 1.2, a water distribution device 1.3, a water outlet pipe 1.4 and a mud discharging pipe 1.5. The water inlet and outlet system 1 is connected with the water inlet end and the water outlet end of the reaction tank 0 through a water inlet pipe 1.1 and a water outlet pipe 1.4, wherein the water inlet end is positioned at the lower end of one side of the reaction tank 0, the water outlet end is positioned at the upper end of the other side of the reaction tank 0, and the mud discharge pipe 1.5 is positioned at the lower end of one side of the water outlet pipe 1.4.
In a second aspect, the invention provides a method for performing short-cut nitrification-anaerobic ammonia oxidation treatment on low ammonia nitrogen wastewater by using the device, which comprises the following steps:
(1) Preparation before treatment:
The low ammonia nitrogen wastewater is connected into the reaction tank, and secondary sedimentation tank residual sludge is connected in parallel;
(2) Short-cut nitrification starting:
Introducing air into the reaction tank by using the intermittent aeration system according to the preset aeration program, and simultaneously enabling the sulfur ion slow-release system to reciprocate in the reaction tank and continuously release sulfur ions until the nitrite ion accumulation rate in the effluent of the reaction tank is not lower than 90%, so as to determine that the short-cut nitrification is successfully started;
(3) Short-cut nitrification-anaerobic ammonia oxidation start-up:
after the short-cut nitrification operation is stable, discharging part of short-cut nitrification sludge from the reaction tank, and adding anaerobic ammonia oxidation sludge, wherein under the condition that TN removal rate in the reaction tank reaches more than 80%, the short-cut nitrification-anaerobic ammonia oxidation is successfully started;
(4) Treatment of low ammonia nitrogen wastewater:
Inoculating sulfur-iron autotrophic denitrification sludge into the reaction tank after the operation of short-cut nitrification-anaerobic ammonia oxidation is stable, and starting to treat the low ammonia nitrogen wastewater under the conditions that TN removal rate in the reaction tank reaches more than 85 percent and the detection rate of sulfur ions in effluent of the reaction tank is 0.
In an alternative embodiment, after the secondary sedimentation tank excess sludge is inoculated in the preparation step before treatment, the concentration of the activated sludge in the reaction tank is 4-5 mg/L.
In an optional implementation manner, in the shortcut nitrification-anaerobic ammonia oxidation starting step, the partial shortcut nitrification sludge is discharged so that the concentration of the activated sludge in the reaction tank is 2-3 mg/L, and the anaerobic ammonia oxidation sludge is added so that the concentration ratio of the shortcut nitrification sludge to the anaerobic ammonia oxidation sludge is 1 (1-1.25).
In an alternative embodiment, in the step of treating the low ammonia nitrogen wastewater, the sulfur-iron autotrophic denitrification sludge is inoculated into the reaction tank so that the weight of the sulfur-iron autotrophic denitrification sludge is 8-12% of the total weight of the sludge in the reaction tank.
In an alternative implementation mode, the short-cut nitrification starting step comprises the steps of starting an intermittent aeration system and a sulfur ion slow-release system, wherein the operation mode comprises the steps of low-frequency aeration for 15-20 minutes, controlling the movable supporting frame to reciprocate left and right at a low speed (5-10 m/min), enabling DO in the reaction tank to be controlled at 0.3-0.5 mg/L, stopping aeration when DO is higher than 0.5mg/L, stopping aeration for 10-15 minutes, controlling the movable supporting frame to reciprocate left and right at a speed (10-15 m/min), high-frequency aeration for 5-10 minutes, controlling the movable supporting frame to reciprocate left and right at a low speed (5-10 m/min), enabling DO in the reaction tank to be controlled at 0.8-1.2 mg/L, stopping aeration for 10-15 min, controlling the movable supporting frame to reciprocate at a speed (10-20 m/min), detecting NH 4 +、NO2 -、NO3 - and TN concentration in effluent of the reaction tank to be alternately operated in the mode until the effluent of the reaction tank reaches a short-cut nitrification rate of 2 -% or more, and the short-cut nitrification is considered successful.
In an optional implementation mode, the short-cut nitrification-anaerobic ammonia oxidation starting step can be that after short-cut nitrification stably operates, partial short-cut nitrification sludge is discharged out of the system, domesticated anaerobic ammonia oxidation sludge is put into the device, the mass ratio of the short-cut nitrification sludge to the anaerobic ammonia oxidation sludge is controlled to be 1 (1-1.25), sludge is not discharged in the initial operation stage, when the TN removal rate of the system reaches more than 20%, a 300-500-micrometer screen is arranged at a sludge discharge port to screen the sludge, anaerobic ammonia oxidation granular sludge is trapped, and when the TN removal rate of system effluent reaches more than 80%, the short-cut nitrification-anaerobic ammonia oxidation system is considered to be successfully started.
In an optional implementation manner, after the short-cut nitrification-anaerobic ammonia oxidation system stably operates, part of the sulfur-iron autotrophic denitrification sludge is inoculated into the system, the sulfur-iron autotrophic denitrification sludge is controlled to account for 8% -12% of the system sludge, until the TN removal rate of the system effluent is stabilized to be more than 85%, and the effluent S 2- cannot be detected, namely the device is considered to meet the operation requirement.
In a third aspect, the invention provides the use of the device in the short-cut nitrification-anaerobic ammonia oxidation treatment of low ammonia nitrogen wastewater.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (15)
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| CN111484131A (en) * | 2020-04-07 | 2020-08-04 | 水艺控股集团股份有限公司 | A carbon-free autotrophic denitrification tank |
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| CN113800637B (en) * | 2021-09-27 | 2023-03-07 | 北京工业大学 | Method for treating urban domestic sewage based on two-stage combined process of short-cut denitrification-anaerobic ammonia oxidation |
| CN219136482U (en) * | 2023-02-27 | 2023-06-06 | 沈阳安德净水材料有限公司 | Sewage disinfection device convenient for adding medicament |
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