Regenerated wastewater fine treatment device and process

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a fine treatment regenerated wastewater treatment device and process, the fine treatment regenerated wastewater treatment device comprises a water inlet mechanism, a short-cut nitrification reactor, an anaerobic ammonia oxidation reactor and a denitrification reactor; short-cut nitrification, anaerobic ammonia oxidation and deep denitrification are creatively connected in series to be used for treating the refined treatment regenerated wastewater of the coal-fired power plant, so that the refined treatment regenerated wastewater of the coal-fired power plant can be treated with low cost, low pollution and high denitrification rate. The three independent reactors, namely the short-cut nitrification reactor, the anaerobic ammonia oxidation reactor and the denitrification reactor, are always in respective specific environments, so that the microbial activity and the impact load resistance of each stage of the whole process are effectively improved, and the stable and efficient operation of the system is more facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a device and process for treating regenerated wastewater. Background Art

[0002] Fine treatment is an important means for thermal power plants to ensure the quality of feed water for large-capacity units. Its purpose is to remove corrosion products and various dissolved impurities and salts in condensate. When the unit is running, a large amount of ammonia needs to be added to the feed water to increase the pH value of the feed water to above 9.0 to prevent acid corrosion caused by the production of free carbon dioxide. This part of the added ammonia is basically removed by fine treatment after condensation. The amount of fine treatment accounts for more than 70% of the boiler feed water. Not only does it consume a lot of ammonia water, but it also causes a large amount of ammonia nitrogen pollutants to be discharged from the wastewater during fine treatment regeneration. The high-speed mixed bed of the condensate fine treatment system of the thermal power plant adopts high-purity hydrochloric acid and sodium hydroxide diluted with deionized water for regeneration, and the impurity ion content in the regenerated wastewater is very low. The cation resin regeneration wastewater contains a large amount of CI-, NH4+, a small amount of hardness ions and iron corrosion products, and the anion resin regeneration wastewater contains a large amount of Na+ and a small amount of hardness ions and SO42-. The two are mixed to become regeneration wastewater mainly containing sodium chloride and ammonia. Ammonia nitrogen is the main factor leading to eutrophication of water bodies. It will cause algae and microorganisms in the water to multiply rapidly, causing a sharp drop in dissolved oxygen in the water, leading to the death of fish and other aquatic organisms due to lack of oxygen, and causing serious impacts on water quality.

[0003] CN201610357128.2 discloses a method and device for treating desulfurization wastewater and removing nitrogen and mercury at the same time in a coal-fired power plant, and relates to the treatment of flue gas from a coal-fired boiler. The device is provided with a boiler burner, an atomizing nozzle, a desulfurization wastewater conveying pipeline, a boiler, a flue, a dust collector, a desulfurization tower, a chimney, a gypsum pile, a reaction tank, a clarification tank and a clear water tank. The method is as follows: the flue gas wet desulfurization wastewater is discharged from the desulfurization tower, and first passes through a reaction tank, a clarification tank and a clear water tank in sequence for conventional wastewater treatment, that is, after adjusting the pH, removing heavy metal ions and suspended matter, the clear liquid is transported to the center of the boiler burner, atomized by an atomizing nozzle, and the atomized desulfurization wastewater is mixed with coal powder and then enters the furnace combustion zone of the boiler for combustion; when the clear liquid is not consumed, the remaining clear liquid is transported to the flue in front of the dust collector, atomized by an atomizing nozzle and then sprayed out, ensuring that the droplet size after atomization is small and evaporates completely before entering the dust collector.

[0004] CN202411187886.5 discloses an anaerobic ammonia oxidation reactor and process for treating high-ammonia nitrogen coal-to-oil wastewater, including: a reaction tank body, a PH detector is arranged on the water inlet pipe, an alarm is installed on the outside of the reaction tank body, the PH detector is electrically connected to the alarm, and a wastewater PH adjustment device is installed inside the reaction tank body; the wastewater PH adjustment device includes: a PH adjustment device; a gear adjustment device; a lifting device; and a flow guide device. The present invention utilizes a setting method in which the PH adjustment device and the gear adjustment device are matched, and through the rotation of the gear adjustment device, it is convenient to squeeze out the PH adjustment agent inside the PH adjustment device, so as to neutralize the PH value in the wastewater, and adjust the PH value to the range of 8.08.4, so that the anaerobic ammonia oxidation bacteria can ensure a high activity, so as to accelerate the reaction rate of converting ammonia nitrogen and nitrite nitrogen into nitrogen at the same time, so as to improve the denitrification treatment efficiency of the wastewater, so that the denitrification treatment effect is better.

[0005] In the existing technology, the processes that coal-fired power plants can use to denitrify ammonia-containing wastewater mainly include physical and chemical methods or biological methods. Physical and chemical methods such as air stripping, breakpoint chlorination and chemical precipitation not only consume a large amount of chemical agents but also cause secondary pollution to the water body. They have the disadvantages of high cost, low efficiency, complex treatment process, and increased environmental burden. In addition, the physical and chemical regeneration wastewater treatment process is complex and has a high economic cost. Summary of the invention

[0006] After long-term production practice, it is found that among the current wastewater treatment technologies, the existing physical and chemical methods such as stripping method, breakpoint chlorination method and chemical precipitation method not only consume a large amount of chemical agents but also cause secondary pollution to the water body. They have the disadvantages of high cost, low efficiency, complex treatment process and increased environmental burden. How to achieve efficient and environmentally friendly treatment of refined regeneration wastewater is the main technical problem facing the industry.

[0007] In view of this, a fine treatment regeneration wastewater treatment device is provided, the device comprising: a water inlet mechanism, a short-range nitrification reactor, an anaerobic ammonium oxidation reactor and a denitrification reactor; the water inlet mechanism is connected to the short-range nitrification reactor, the water inlet mechanism can pump wastewater into the short-range nitrification reactor, the short-range nitrification reactor contains a first microbial filler, and the first microbial filler can perform short-range nitrification treatment on the wastewater; the short-range nitrification reactor is connected to the anaerobic ammonium oxidation reactor, the short-range nitrification reactor can transport wastewater to the anaerobic ammonium oxidation reactor, the anaerobic ammonium oxidation reactor contains a second microbial filler, and the second microbial filler can perform anaerobic ammonium oxidation treatment on the wastewater; the anaerobic ammonium oxidation reactor is connected to the denitrification reactor, the anaerobic ammonium oxidation reactor can transport wastewater to the denitrification reactor, the denitrification reactor contains a third microbial filler, and the third microbial filler can perform denitrification treatment on the wastewater.

[0008] In one embodiment, the water inlet mechanism includes a wastewater tank, a water distribution tank and a heating water tank connected in sequence; the wastewater flows through the wastewater tank, the water distribution tank and the heating water tank in sequence under the drive of a driving member; the water distribution tank is provided with a first dosing point, and the first dosing point is used to add a specified solvent to adjust the pH value of the wastewater; the heating water tank is provided with a heating element, and the heating element is used to heat the wastewater.

[0009] In one embodiment, the water distribution tank is connected to a conductivity and / or pH meter.

[0010] In one embodiment, the short-range nitrification reactor is provided with a second dosing point, which is used to add nutrient salts corresponding to the first microbial filler; the short-range nitrification reactor and the anaerobic ammonia oxidation reactor are connected to a conductivity meter and / or a pH meter.

[0011] In one embodiment, the anaerobic ammonia oxidation reactor is connected to a DO meter, an ammonia nitrogen meter, a nitrate nitrogen meter and / or a pH meter; the denitrification reactor is connected to a COD meter, a nitrate nitrogen meter and a pH meter.

[0012] In one embodiment, the short-cut nitrification reactor, the anaerobic ammonium oxidation reactor and the denitrification reactor are all provided with a mud discharge port, and the mud discharge port is used for discharging the first microbial filler, the second microbial filler or the third microbial filler.

[0013] On the other hand, the present invention provides a process for treating wastewater from fine treatment and regeneration, the process comprising: a water inlet mechanism inputs wastewater from fine treatment and regeneration into a short-range nitrification reactor, ammonia nitrogen in the wastewater undergoes short-range nitrification under the action of a first microbial filler, so as to oxidize part of the ammonia nitrogen into nitrite nitrogen; the wastewater after short-range nitrification is transported to an anaerobic ammonia oxidation reactor, nitrite nitrogen and ammonia nitrogen in the wastewater undergo anaerobic ammonia oxidation under the action of a second microbial filler, so as to convert ammonia nitrogen and nitrite nitrogen into nitrogen gas and nitrate nitrogen in proportion; the wastewater after anaerobic ammonia oxidation is transported to a denitrification reactor, nitrate nitrogen in the wastewater undergoes deep denitrification under the action of a third microbial filler, so as to reduce nitrate nitrogen into nitrogen gas.

[0014] In one embodiment, the first microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.5-8.5, the temperature is 20-27° C., and the dissolved oxygen is 0.4-0.7 mg / L.

[0015] In one embodiment, the second microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 12-18 g / L, the sludge retention time is 17-30 days, the pH is 6.7-8.5, the temperature is 30-35°C, and the dissolved oxygen is 0.2-0.4 mg / L.

[0016] In one embodiment, the third microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.0-7.5, the temperature is 30-35°C, the dissolved oxygen is 0.4-0.7 mg / L, and the carbon source required for microbial growth and metabolism is added to this part to maintain a C / N ratio of 2-5.

[0017] The present invention discloses a fine treatment regeneration wastewater treatment device and process, comprising a water inlet mechanism, a short-range nitrification reactor, an anaerobic ammonium oxidation reactor and a denitrification reactor; the water inlet mechanism is connected to the short-range nitrification reactor, and the water inlet mechanism can pump wastewater into the short-range nitrification reactor, and the short-range nitrification reactor contains a first microbial filler, and the first microbial filler can perform short-range nitrification treatment on the wastewater; the short-range nitrification reactor is connected to the anaerobic ammonium oxidation reactor, and the short-range nitrification reactor can transport wastewater to the anaerobic ammonium oxidation reactor, and the anaerobic ammonium oxidation reactor contains a second microbial filler, and the second microbial filler can perform anaerobic ammonium oxidation treatment on the wastewater; the anaerobic ammonium oxidation reactor is connected to the denitrification reactor, and the anaerobic ammonium oxidation reactor can transport wastewater to the denitrification reactor, and the denitrification reactor contains a third microbial filler, and the third microbial filler can perform denitrification treatment on the wastewater. This application creatively connects short-range nitrification, anaerobic ammonium oxidation and deep denitrification in series to treat fine treatment regeneration wastewater from coal-fired power plants, which can achieve low cost, low pollution and high denitrification rate treatment of fine treatment regeneration wastewater from coal-fired power plants. In addition, the present invention uses three independent reactors for short-range nitrification, anaerobic ammonium oxidation and denitrification, so that the three are always in their own specific environment, effectively improving the microbial activity and shock load resistance of each stage of the entire process, which is more conducive to the stable and efficient operation of the system.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic diagram of a process flow of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention;

[0022] Figure 3 This is a parameter diagram of an example of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Water inlet mechanism; 11. Wastewater tank; 12. Buffer water tank; 13. Water distribution tank; 14. Heating water tank; 2. Short-range nitrification reactor; 3. Anaerobic ammonia oxidation reactor; 31. Anaerobic water distribution tank; 4. Denitrification reactor; 41. Denitrification water distribution tank; 5. Water pump. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices; "fixed" or "fixed connection" generally refers to common mechanical connection methods, such as threaded connection, welding or bonding, etc.

[0028] Figure 1 A schematic diagram of a process flow of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention; please refer to Figure 1 and Figure 2 .

[0029] After long-term production practice, it is found that among the current wastewater treatment technologies, the existing physical and chemical methods such as stripping method, breakpoint chlorination method and chemical precipitation method not only consume a large amount of chemical agents but also cause secondary pollution to the water body. They have the disadvantages of high cost, low efficiency, complex treatment process and increased environmental burden. How to achieve efficient and environmentally friendly treatment of refined regeneration wastewater is the main technical problem facing the industry.

[0030] In view of this, a fine treatment regeneration wastewater treatment device is provided, the device comprising: a water inlet mechanism 1, a short-range nitrification reactor 2, an anaerobic ammonium oxidation reactor 3 and a denitrification reactor 4; the water inlet mechanism 1 is connected to the short-range nitrification reactor 2, the water inlet mechanism 1 can pump wastewater 5 into the short-range nitrification reactor 2, the short-range nitrification reactor 2 contains a first microbial filler, and the first microbial filler can perform short-range nitrification treatment on the wastewater; the short-range nitrification reactor 2 is connected to the anaerobic ammonium oxidation reactor 3, the short-range nitrification reactor 2 can transport wastewater to the anaerobic ammonium oxidation reactor 3, the anaerobic ammonium oxidation reactor 3 contains a second microbial filler, and the second microbial filler can perform anaerobic ammonium oxidation treatment on the wastewater; the anaerobic ammonium oxidation reactor 3 is connected to the denitrification reactor 4, the anaerobic ammonium oxidation reactor 3 can transport wastewater to the denitrification reactor 4, the denitrification reactor 4 contains a third microbial filler, and the third microbial filler can perform denitrification treatment on the wastewater.

[0031] This application creatively connects short-range nitrification, anaerobic ammonium oxidation and deep denitrification in series to treat fine treatment regeneration wastewater from coal-fired power plants, which can achieve low cost, low pollution and high denitrification rate treatment of fine treatment regeneration wastewater from coal-fired power plants. In addition, the present invention uses three independent reactors for short-range nitrification, anaerobic ammonium oxidation and denitrification, so that the three are always in their own specific environment, effectively improving the microbial activity and shock load resistance of each stage of the entire process, which is more conducive to the stable and efficient operation of the system.

[0032] In an embodiment of the present invention, the fine treatment regeneration wastewater treatment device includes a water mechanism, a short-range nitrification reactor 2, an anaerobic ammonia oxidation reactor 3 and a denitrification reactor 4 connected in sequence through pipelines. So that the wastewater can pass through the subsequent three reactors in sequence under the action of the water inlet mechanism 1, so as to achieve denitrification treatment of the wastewater in sequence. Among them, the water inlet mechanism 1 includes a wastewater tank 11, a water distribution tank 13 and a heating water tank 14 connected in sequence; wherein the wastewater tank 11 is used to accommodate fine treatment regeneration wastewater. A buffer water tank 12 can be provided between the wastewater tank 11 and the water distribution tank 13, and the buffer water tank 12 can temporarily store the wastewater to ensure that the previous wastewater can complete the short-range nitrification reaction for a sufficient time to ensure the completion of the subsequent reaction, so as to improve the ammonia nitrogen removal rate. The water distribution tank 13 is provided with a first dosing point, which is used to add a specified solvent to adjust the pH value of the wastewater; the specified solvent can be sodium carbonate and sodium hydroxide, so as to adjust the pH value of the wastewater in the water distribution tank 13, so that the wastewater can be within the pH value range corresponding to the first microbial filler, thereby ensuring the activity of the microorganisms to achieve short-range nitrification. Similarly, the heating water tank is provided with a heating element, which is used to heat the wastewater so that the wastewater can be within the temperature value range corresponding to the first microbial filler, thereby ensuring the activity of the microorganisms to achieve short-range nitrification. Among them, the water distribution tank 13 is connected to a conductivity and / or pH meter to monitor the conductivity and pH value of the wastewater, so as to facilitate the precise adjustment of the pH value of the wastewater in the water distribution tank 13 through the first dosing point to meet the needs of the first microbial filler. Among them, the water inlet mechanism 1 can also include a water pump 5 arranged in each pipeline.

[0033] The heating pool 14 is connected to the short-range nitrification reactor 2 to transport the wastewater reaching the specified temperature and the specified pH value to the short-range nitrification reactor 2 for short-range nitrification. Among them, short-range nitrification refers to controlling the nitrification process to only proceed to the nitrite stage, that is, ammonia nitrogen is oxidized to nitrite, and no longer continues to be oxidized to nitrate. Short-range nitrification has broad application prospects in the field of sewage treatment. Especially in the treatment of industrial wastewater with high ammonia nitrogen and low COD, short-range nitrification can effectively reduce operating costs and improve treatment efficiency. Specifically, short-range nitrification is achieved by accommodating a first microbial filler in the short-range nitrification reactor 2, and the first microbial filler at least includes nitrifying bacteria that can nitrify ammonia nitrogen; by adjusting parameters such as time and temperature, the nitrifying bacteria are controlled to perform short-range nitrification to oxidize part of the ammonia nitrogen to nitrite nitrogen, and part of it exists in the wastewater in the form of ammonia nitrogen to facilitate subsequent anaerobic ammonia oxidation.

[0034] The short-range nitrification reactor 2 can also be connected to the anaerobic ammonium oxidation reactor 3 through the anaerobic water distribution tank 31. The anaerobic water distribution tank 31 can be set to buffer the wastewater delivered by the short-range nitrification reactor 2, and it can also ensure the relative independence between the short-range nitrification reactor 2 and the anaerobic ammonium oxidation reactor 3, so that the two are always in their own dedicated environment, effectively improving the microbial activity and shock load resistance of each stage of the entire process, and more conducive to the stability and efficient operation of the system. Among them, the anaerobic water distribution tank 31 can also be provided with a temperature regulating member so that the wastewater therein can be more suitable for the survival of subsequent anaerobic ammonium oxidizing bacteria. The anaerobic water distribution tank 31 can transport the wastewater to the anaerobic ammonium oxidation reactor 3, and the anaerobic ammonium oxidation reactor 3 can convert the ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen and nitrate nitrogen in proportion through anaerobic ammonium oxidation; anaerobic ammonium oxidation refers to a process in which a microorganism oxidizes ammonia into nitrogen under anaerobic conditions with nitrite as an electron acceptor, and this process is catalyzed by a class of specialized anaerobic microorganisms called "anaerobic ammonium oxidizing bacteria" (Anammox bacteria). The anaerobic ammonium oxidation reactor 3 contains a second microbial filler, and the second microbial filler includes at least anaerobic ammonium oxidizing bacteria.

[0035] The anaerobic ammonia oxidation reactor 3 is connected to the denitrification reactor 4 through a denitrification water distribution tank 41. The setting of the denitrification water distribution tank 41 can buffer the wastewater transported out of the anaerobic ammonia oxidation reactor 3; at the same time, it can also ensure the relative independence between the denitrification reactor 4 and the anaerobic ammonia oxidation reactor 3, so that the two are always in their own dedicated environment, effectively improving the microbial activity and shock load resistance of each stage of the entire process, and is more conducive to the stability and efficient operation of the system. Among them, the denitrification water distribution tank 41 can also be provided with a temperature regulating part to make the wastewater therein more suitable for the survival of subsequent denitrifying bacteria. The anaerobic ammonia oxidation reactor 3 can transport the wastewater to the denitrification reactor 4 for the final denitrification treatment, that is, denitrification treatment. Specifically, the denitrification process, that is, the denitrification process, refers to the biochemical process in which bacteria reduce nitrogen in nitrates to nitrogen gas through a series of intermediates. The denitrification reactor 4 contains a third microbial filler, which at least includes denitrifying bacteria. The third microbial filler can reduce nitrate nitrogen to nitrogen gas to complete the final denitrification process and achieve wastewater treatment.

[0036] The short-range nitrification reactor 2 is provided with a second dosing point, which is used to add nutrient salts corresponding to the first microbial filler; the nutrient salts are used to promote the growth and reproduction of microorganisms. The short-range nitrification reactor 2 and the anaerobic ammonia oxidation reactor 3 are connected with a conductivity meter and / or a pH meter to monitor the wastewater, so as to facilitate the monitoring of short-range nitrification.

[0037] In one embodiment, the anaerobic ammonium oxidation reactor 3 is connected to a DO meter, an ammonia nitrogen meter, a nitrate nitrogen meter and / or a pH meter to monitor the wastewater, so as to facilitate the monitoring of the anaerobic ammonium oxidation process. The denitrification reactor 4 is connected to a COD meter, a nitrate nitrogen meter and a pH meter to monitor the wastewater, so as to facilitate the monitoring of the denitrification process.

[0038] In one embodiment, the short-range nitrification reactor 2, the anaerobic ammonia oxidation reactor 3 and the denitrification reactor 4 are all provided with a mud discharge port, which is used to discharge the first microbial filler, the second microbial filler or the third microbial filler, thereby ensuring an appropriate amount of bacterial flora inside the three to ensure the denitrification rate of the wastewater.

[0039] Figure 3 This is a parameter diagram of an embodiment of a fine treatment regeneration wastewater treatment device according to an embodiment of the present invention; please refer to Figure 3 ; The present invention provides a specific embodiment:

[0040] The wastewater treatment capacity adopted in this embodiment is 2m3 / d, the internal pool body is made of 316L stainless steel, the intermediate water tank and the drug storage tank are made of PE material, and the total size of the device pool body is L×B×H of 7m×2.2m×2.8m. Specifically: the industrial water pool is a self-built facility in the factory area, the buffer water tank 12 has a capacity of 8t with a conical base for easy drainage, and the flow range of the wastewater lifting pump is 0-5L / min; the capacity of the short-range nitrification water distribution pool 13 is 300L, equipped with sodium hydroxide and sodium carbonate dosing devices and a mixer, and the flow range of the water inlet pump 5 is 0-5L / min; the capacity of the heating pool is 300L, equipped with adjustable temperature electric heating coil; the size of the short-range nitrification reactor 2 is φ×H=1300×1300mm, and the flow range of the water inlet pump 5 is 0~5L / min; the capacity of the anaerobic water distribution tank 31 is 300L, the flow range of the water inlet pump 5 is 0~5L / min, and the size of the anaerobic ammonia oxidation reactor 3 is φ×H=1300×1300mm; the capacity of the denitrification water distribution tank 13 is 300L, equipped with a carbon source dosing device and a stirrer, the flow range of the water inlet pump 5 is 0~5L / min, and the size of the denitrification reactor is φ×H=1300×1300mm.

[0041] Specifically, the incoming water enters the buffer water tank 12 through the lifting pump from the industrial wastewater pool 11, and then enters the water distribution pool 13 through the water inlet pump 5. The water distribution pool 13 is equipped with conductivity, pH meters and sodium carbonate and sodium hydroxide dosing points to neutralize the acidic substances in the incoming water and increase the alkalinity. The wastewater further flows into the heating water pool 14 by gravity to keep the incoming water within the appropriate temperature range. The wastewater further enters the short-range nitrification tank through the lifting pump. The short-range nitrification tank is equipped with DO, ammonia nitrogen, nitrate nitrogen, pH meters and nutrient salt dosing points. After the wastewater flows into the anaerobic water distribution pool 31 by gravity, it enters the anaerobic ammonia oxidation tank through the lifting pump. The anaerobic ammonia oxidation tank is equipped with DO, ammonia nitrogen, nitrate nitrogen and pH meters. After the wastewater flows into the denitrification (denitrification) water distribution pool 13 by gravity, it enters the denitrification tank through the lifting pump. The denitrification tank is equipped with COD, nitrate nitrogen and pH meters. The produced water is directly discharged to the power plant water system for reuse. The quality of the inlet water and the produced water are as follows: Figure 3 shown.

[0042] On the other hand, the present invention provides a process for treating wastewater from fine treatment and regeneration, the process comprising: a water inlet mechanism 1 inputs wastewater from fine treatment and regeneration into a short-range nitrification reactor 2, and ammonia nitrogen in the wastewater undergoes short-range nitrification under the action of a first microbial filler to oxidize part of the ammonia nitrogen into nitrite nitrogen; the wastewater after short-range nitrification is transported to an anaerobic ammonia oxidation reactor 3, and nitrite nitrogen and ammonia nitrogen in the wastewater undergo anaerobic ammonia oxidation under the action of a second microbial filler to convert ammonia nitrogen and nitrite nitrogen into nitrogen gas and nitrate nitrogen in proportion; the wastewater after anaerobic ammonia oxidation is transported to a denitrification reactor 4, and nitrate nitrogen in the wastewater undergoes deep denitrification under the action of a third microbial filler to reduce nitrate nitrogen into nitrogen gas.

[0043] In an embodiment of the present invention, the first microbial filler includes domesticated sludge, and the sludge concentration after inoculation and domestication should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.5-8.5, the temperature is 20-27°C, and the dissolved oxygen is 0.4-0.7 mg / L; wherein, the activated sludge can be inoculated in a municipal sewage treatment plant for inoculation and domestication. The second microbial filler includes domesticated sludge, and the sludge concentration after inoculation and domestication should be controlled at 12-18 g / L, the sludge retention time is 17-30 days, the pH is 6.7-8.5, the temperature is 30-35°C, and the dissolved oxygen is 0.2-0.4 mg / L. Among them, the anaerobic ammonia oxidation reactor 3 adopts the UASB process, which can be used in the municipal sewage treatment plant A 2The denitrification sludge in the / O process is domesticated into particles and then used as anaerobic ammonia oxidation sludge for inoculation and domestication. The third microbial filler includes the domesticated sludge. The sludge concentration after inoculation and domestication should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.0-7.5, the temperature is 30-35°C, and the dissolved oxygen is 0.4-0.7 mg / L. At the same time, the carbon source required for microbial growth and metabolism is added to maintain a C / N ratio of 2-5. In the denitrification reactor 4, the municipal sewage treatment plant A can be used. 2 The denitrifying sludge in the / O process is used as the sludge for deep denitrification process for inoculation and domestication.

[0044] This process has a significant effect on the treatment of high-salt, high-ammonia-nitrogen, and low-C / N ratio wastewater such as the refined treatment regeneration wastewater from coal-fired power plants, and the removal rate of the main pollutant ammonia nitrogen can reach 97%. Among them, anaerobic ammonia-oxidizing bacteria are chemoautotrophic bacteria that use CO2 as an inorganic carbon source and do not require aeration and organic carbon sources, thereby greatly saving energy consumption and reagent addition.

[0045] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0046] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] In the several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0048] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0049] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0050] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a mobile terminal, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fine treatment regeneration wastewater treatment device, characterized in that: The device comprises: a water inlet mechanism (1), a short-range nitrification reactor (2), an anaerobic ammonium oxidation reactor (3) and a denitrification reactor (4); The water inlet mechanism (1) is connected to the short-range nitrification reactor (2), and the water inlet mechanism (1) can pump wastewater (5) into the short-range nitrification reactor (2). The short-range nitrification reactor (2) contains a first microbial filler, and the first microbial filler can perform short-range nitrification treatment on the wastewater; The short-cut nitrification reactor (2) is connected to the anaerobic ammonium oxidation reactor (3), and the short-cut nitrification reactor (2) can transport wastewater to the anaerobic ammonium oxidation reactor (3). The anaerobic ammonium oxidation reactor (3) contains a second microbial filler, and the second microbial filler can perform anaerobic ammonium oxidation treatment on the wastewater; The anaerobic ammonium oxidation reactor (3) is connected to a denitrification reactor (4), and the anaerobic ammonium oxidation reactor (3) is capable of transporting wastewater to the denitrification reactor (4). The denitrification reactor (4) contains a third microbial filler, and the third microbial filler is capable of denitrifying the wastewater.

2. The fine treatment regeneration wastewater treatment device according to claim 1 is characterized in that: The water inlet mechanism (1) comprises a wastewater tank (11), a water distribution tank (13) and a heating water tank (14) which are connected in sequence; The wastewater is driven by a driving member to flow through the wastewater pool (11), the water distribution pool (13) and the heating water pool (14) in sequence; the water distribution pool (13) is provided with a first dosing point, and the first dosing point is used to add a specified solvent to adjust the pH value of the wastewater; The heating water pool is provided with a heating element, and the heating element is used to heat the wastewater.

3. The fine treatment regeneration wastewater treatment device according to claim 2 is characterized in that: The water distribution tank (13) is connected to a conductivity and / or pH meter.

4. The fine treatment regeneration wastewater treatment device according to claim 1 is characterized in that: The short-range nitrification reactor (2) is provided with a second dosing point, and the second dosing point is used to add nutrient salts corresponding to the first microbial filler; the short-range nitrification reactor (2) and the anaerobic ammonia oxidation reactor (3) are connected to a conductivity meter and / or a pH meter.

5. The fine treatment regeneration wastewater treatment device according to claim 1 is characterized in that: The anaerobic ammonium oxidation reactor (3) is connected to a DO meter, an ammonia nitrogen meter, a nitrate nitrogen meter and / or a pH meter; the denitrification reactor (4) is connected to a COD meter, a nitrate nitrogen meter and a pH meter.

6. The fine treatment regeneration wastewater treatment device according to claim 1 is characterized in that: The short-cut nitrification reactor (2), the anaerobic ammonium oxidation reactor (3) and the denitrification reactor (4) are all provided with a mud discharge port, and the mud discharge port is used for discharging the first microbial filler, the second microbial filler or the third microbial filler.

7. A fine treatment regeneration wastewater treatment process, characterized in that: The process comprises: The water inlet mechanism (1) inputs the wastewater regenerated by fine treatment into the short-cut nitrification reactor (2), and the ammonia nitrogen in the wastewater is short-cut nitrified under the action of the first microbial filler to oxidize part of the ammonia nitrogen into nitrite nitrogen; The wastewater after the short-cut nitrification is transported to the anaerobic ammonium oxidation reactor (3), and the nitrite nitrogen and ammonia nitrogen in the wastewater are anaerobic ammonium oxidized under the action of the second microbial filler, so as to convert the ammonia nitrogen and nitrite nitrogen into nitrogen gas and nitrate nitrogen in proportion; The wastewater after anaerobic ammonia oxidation is transported to the denitrification reactor (4), and the nitrate nitrogen in the wastewater is deeply denitrified under the action of the third microbial filler to reduce the nitrate nitrogen to nitrogen gas.

8. The fine treatment regeneration wastewater treatment process according to claim 7 is characterized in that: The first microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.5-8.5, the temperature is 20-27°C, and the dissolved oxygen is 0.4-0.7 mg / L.

9. The fine treatment regeneration wastewater treatment process according to claim 7 is characterized in that: The second microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 12-18 g / L, the sludge retention time is 17-30 days, the pH is 6.7-8.5, the temperature is 30-35°C, and the dissolved oxygen is 0.2-0.4 mg / L.

10. The fine treatment regeneration wastewater treatment process according to claim 7, characterized in that: The third microbial filler includes domesticated sludge. After inoculation and domestication, the sludge concentration should be controlled at 6-9 g / L, the sludge retention time is 8-12 days, the pH is 7.0-7.5, the temperature is 30-35°C, and the dissolved oxygen is 0.4-0.7 mg / L. At the same time, the carbon source required for microbial growth and metabolism is added to this part to maintain a C / N ratio of 2-5.

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