Treatment system and treatment method for high-ammonia-nitrogen wastewater

Abstract

The invention discloses a system and a method for treating high-ammonia-nitrogen wastewater. The system comprises a tank body; the tank body is internally and sequentially provided with an inlet water homogenizing and regulating tank, a filler reaction area, a sludge settling area and a gas stripping area along the wastewater treatment direction; a water inlet is formed in the water inlet homogenizing regulating tank, anaerobic ammoxidation suspended filler is arranged in the filler reaction region, and a sludge-water mixture flows in the filler reaction region in an up-down baffling manner; an inclined plate is arranged in the middle of the sludge settling region; a sludge hopper is arranged at the bottom of the sludge settling region; a sludge return outlet is formed in the bottom of the sludge hopper; part of sludge flows back to the foremost end of the filler reaction area through the sludge backflow outlet, and a water outlet is formed in the area above the inclined plate; a gas stripping device is arranged at the bottom of the gas stripping area and is used for feeding a gas-water mixture into the inlet water homogenizing and regulating tank in a gas stripping manner. According to the invention, dissolved oxygen of the whole reaction system is controlled through gas stripping, and integrated nitrosation and anaerobic ammonia oxidation reaction is realized to synergistically remove ammonia nitrogen and total nitrogen in high-ammonia-nitrogen wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a system and method for treating high-ammonia nitrogen wastewater. Background Art

[0002] High ammonia nitrogen wastewater is difficult to treat directly through conventional biochemical methods due to the inhibition of biochemistry by free ammonia. In industry, physical and chemical methods such as stripping and ammonia evaporation are usually used to treat high ammonia nitrogen wastewater, but the power consumption and chemical consumption costs are generally high.

[0003] Anaerobic ammonia oxidation process technology is a highly efficient denitrification technology developed in recent years for the treatment of high ammonia nitrogen wastewater. It is currently the most advanced biological denitrification process in the world. It generates nitrogen gas by using ammonia as an electron donor and nitrite as an electron acceptor under anaerobic conditions. The anaerobic ammonia oxidation denitrification process has high denitrification efficiency, high load, and no need for an external carbon source for total nitrogen removal, which greatly reduces the energy and material consumption of the denitrification process, and reduces greenhouse gas emissions by more than 90%. It is currently the most economical and efficient sewage denitrification technology. It solves the shortcomings of traditional nitrification and denitrification processes such as high aeration energy consumption, reliance on external carbon sources to remove total nitrogen, and large sludge production.

[0004] The anaerobic ammonium oxidation metabolic reaction is as follows: NH4 + +1.31NO2 - +0.066HCO3 - +0.13H + →1.02N2+0.26NO3 - +0.066CH2O 0.5 N 0.5 +2.03H2O For actual high ammonia nitrogen wastewater, there is no direct nitrite in the water, so it is necessary to control the reaction conditions such as temperature, dissolved oxygen, etc., and utilize the action of nitrite bacteria in the water to first oxidize part of the ammonia nitrogen into nitrite nitrogen under micro-aerobic conditions, and not continue to oxidize into nitrate nitrogen. Nitrite nitrogen and ammonia nitrogen continue to be directly converted into nitrogen gas under the action of anaerobic ammonia-oxidizing bacteria, thereby achieving the removal of high-concentration ammonia nitrogen.

[0005] NH4 + +1.5O2→NO2 - +H + +H2O NH4 + +1.32NO2 - +0.132HCO3 - +0.512H + →1.02N2+0.26NO3 - +CH2O 0.5 N 0.15+2.19H2O In the actual wastewater anaerobic ammonium oxidation denitrification reaction, the dissolved oxygen needs to be controlled below 0.5 mg / L to effectively inhibit the further oxidation of nitrite nitrogen, inhibit the activity of nitrifying bacteria, reduce the conventional nitrification reaction, ensure the accumulation of nitrite nitrogen, and then ensure that the anaerobic ammonium oxidizing bacteria can effectively use ammonia nitrogen and nitrite nitrogen for reaction. The anaerobic ammonium oxidizing bacteria reaction is usually anaerobic conditions, so the dissolved oxygen in the integrated nitrification and anaerobic ammonium oxidation reactions is usually controlled below 0.3 mg / L to ensure that the nitrification and anaerobic ammonium oxidizing bacteria have high reaction activity. Summary of the invention

[0006] In view of the problems of difficult dissolved oxygen control, poor mixing effect, sludge loss, etc. in anaerobic ammonia oxidation reaction of high-ammonia nitrogen wastewater, in order to achieve the removal of ammonia nitrogen and total nitrogen in high-ammonia nitrogen and low carbon-nitrogen ratio industrial wastewater, the present invention provides a treatment system and treatment method for high-ammonia nitrogen wastewater. The treatment system is an integrated structure, which controls the dissolved oxygen of the entire reaction system through gas lift to achieve integrated nitrite and anaerobic ammonia oxidation reactions to synergistically remove ammonia nitrogen and total nitrogen in high-ammonia nitrogen wastewater; the integrated gas lift anaerobic ammonia oxidation reactor of the present invention has high integration, does not require a large amount of aeration, does not require the addition of inorganic carbon source, and has the advantages of high integration and low energy consumption.

[0007] The invention discloses a high-ammonia nitrogen wastewater treatment system, comprising: a tank body; a water inlet homogenization regulating tank, a filler reaction zone, a sludge precipitation zone and a gas stripping zone are sequentially arranged in the tank body along the wastewater treatment direction; The inlet homogenization regulating tank is provided with a water inlet, the packing reaction zone is provided with an anaerobic ammonia oxidation hanging packing and the mud-water mixture flows in the packing reaction zone in an up-and-down baffled manner, the middle of the sludge sedimentation zone is provided with an inclined plate, the bottom of the sludge sedimentation zone is provided with a sludge hopper, the area between the inclined plate and the sludge hopper is connected with the bottom of the gas stripping zone, the bottom of the sludge hopper is provided with a sludge reflux outlet, part of the sludge flows back to the front end of the packing reaction zone through the sludge reflux outlet, and a water outlet is provided in the upper area of ​​the inclined plate; the bottom of the gas stripping zone is provided with a gas stripping device, the gas stripping device sends the gas-water mixture into the inlet homogenization regulating tank in a gas stripping manner, and the gas-water mixture in the inlet homogenization regulating tank is mixed with the high-ammonia nitrogen wastewater entering through the water inlet.

[0008] As a further improvement of the present invention, a plurality of first guide plates and second guide plates are arranged in an alternating manner in the packing reaction zone, the top of the second guide plate is higher than the top of the first guide plate, the first guide plate and the second guide plate divide the packing reaction zone into a plurality of packing reaction sub-zones, the most upstream packing reaction sub-zone is provided with a sludge return inlet and a water distribution hole connected to the inlet homogenization regulating tank, the sludge return inlet is connected to the sludge return outlet; an anaerobic ammonia oxidation hanging packing is installed in each of the packing reaction sub-zones; the first guide plate is connected to the bottom of the tank body, and a flow channel is left between the second guide plate and the bottom of the tank body; the mud-water mixture in the upstream packing reaction sub-zone flows into the downstream packing reaction sub-zone through the flow channel at the bottom of the second guide plate, or the mud-water mixture in the upstream packing reaction sub-zone overflows into the downstream packing reaction sub-zone through the top of the first guide plate; based on this, the mud-water mixture flows in the packing reaction zone in an up and down baffle manner.

[0009] As a further improvement of the present invention, a guide wall is provided at the lower end of the first guide plate, and the guide wall has an inclination angle of 45-60° to prevent sludge from settling in a right-angle area to form a dead zone.

[0010] As a further improvement of the present invention, the anaerobic ammonium oxidation suspension filler is formed by connecting square hydrophilic polyurethane fillers in series, and the anaerobic ammonium oxidation suspension filler is fixed by upper suspension; the internal pore size of the square hydrophilic polyurethane filler is 1-2mm, and the small pore size is conducive to the anaerobic ammonium oxidation sludge biofilm and granulation.

[0011] As a further improvement of the present invention, the end of the packing reaction zone is connected with the sludge sedimentation zone through a water trough, the inclined plate of the sludge sedimentation zone is used to intercept the sludge, and the lower part of the sludge sedimentation zone is a trapezoidal sludge hopper area; the sludge return outlet below the sedimentation tank is connected with the sludge return inlet of the packing reaction zone through a pump; the clean water outlet above the inclined plate is used to allow the outlet water to flow into the next unit by gravity; a special-shaped communicating vessel is provided on one side of the sludge hopper of the sludge sedimentation zone, which is connected with the bottom of the gas lift zone through the special-shaped communicating vessel, and the upper height of the special-shaped communicating vessel is higher than the upper height of the sludge hopper, which is used to reduce the sludge entering the special-shaped communicating vessel, thereby reducing the amount of sludge entering the gas lift zone; wherein the special-shaped communicating vessel is composed of an upper vertical section and a lower inclined section, and the inclined section is inclined toward the bottom of the gas lift zone.

[0012] As a further improvement of the present invention, the width of the gas stripping zone along the direction of the inlet water flow is smaller than the length perpendicular to the inlet water flow direction, that is, the width is narrow and the length is long; the gas stripping device is a long strip microporous aeration component arranged at the bottom of the length direction of the gas stripping zone, and the microporous aeration component is connected to the fan, and the fan can be a rotary fan, a Roots blower, etc., and the air volume is adjusted to adjust the gas stripping reflux water volume and the dissolved oxygen in the entire filler reaction zone.

[0013] The present invention also provides a method for treating high-ammonia nitrogen wastewater, comprising: Step 1, high ammonia nitrogen wastewater enters the inlet homogenization regulating tank through the water inlet, and is mixed with the gas stripping reflux effluent from the gas stripping area in the inlet homogenization regulating tank; wherein, the dissolved oxygen in the inlet homogenization regulating tank is controlled to be 0.4-0.5 mg / L; at the same time, an alkali solution dosing device is provided to control the pH of the inlet homogenization regulating tank to be 7.5-8.5, and the inlet alkalinity is greater than 4 times the ammonia nitrogen concentration; Step 2, the wastewater overflows from the inlet homogenization regulating tank into the packing reaction zone to carry out nitrite and anaerobic ammonium oxidation reactions; wherein the packing reaction zone contains a small amount of suspended nitrite sludge, and the anaerobic ammonium oxidation suspended packing is mainly anaerobic ammonium oxidation granular sludge; the incoming water entering the packing reaction zone reacts continuously during the deflection process to reduce sludge sedimentation; wherein the dissolved oxygen in the packing reaction zone is controlled at 0.1-0.3 mg / L, and the pH is controlled at 7.5-8.5 to ensure the activity of nitrite and anaerobic ammonium oxidation sludge; Step 3, the sludge-water mixture after the anaerobic ammonia oxidation reaction enters the sludge sedimentation area from the outlet tank at the end of the packing reaction area, the sludge enters the sludge hopper for sedimentation, the settled sludge is discharged from the sludge return outlet, and refluxes to the front end of the packing reaction area through the sludge return pump for sludge replenishment; Step 4: The sewage after preliminary sedimentation in the sludge sedimentation area flows into the gas stripping area through a special-shaped communicating vessel from the top of the sludge hopper to the bottom of the gas stripping area. The special-shaped communicating vessel reduces the sludge entering the gas stripping area while ensuring the sludge sedimentation, and prevents the sludge from being inactivated due to excessive aeration; the clean water in the area above the inclined plate of the sludge sedimentation area is discharged through the outlet; Step 5: The wastewater entering the gas stripping area releases gas through the gas stripping area, raising the liquid level in the gas stripping area. The gas-water mixture enters the inlet homogenization regulating tank through the overflow tank and is fully mixed with the incoming water, and enters the subsequent circulation reaction to form a closed loop.

[0014] As a further improvement of the present invention, nitrite suspended sludge is added into the filler reaction zone to provide nitrite and anaerobic ammonia oxidizing bacteria; the mud-water hybrid power in the filler reaction zone comes from the power brought by the air lift reflux and the power mixing brought by the upper and lower baffles, thereby achieving efficient mixing while reducing sludge sedimentation.

[0015] As a further improvement of the present invention, the dissolved oxygen in the packing reaction zone is controlled by the amount of oxygen brought by the gas lift reflux, and the dissolved oxygen in the anaerobic ammonium oxidation reaction zone is adjusted to 0.1-0.3 mg / L by the gas lift amount to ensure the progress of nitrite and anaerobic ammonium oxidation reactions.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The reaction system of the present invention integrates water inlet, anaerobic ammonium oxidation filler reaction zone, sludge sedimentation zone, gas stripping reflux zone, sludge reflux and gas stripping reflux, with compact structure and high efficiency integration; 2. The packing reaction zone of the present invention adopts a baffle design and is divided into a plurality of interconnected reaction areas. By folding, the reaction mixing efficiency of the mud-water mixture and the anaerobic ammonium oxidation suspension packing is improved, thereby improving the anaerobic ammonium oxidation reaction efficiency; 3. The anaerobic ammonium oxidation hanging filler of the present invention is assembled in series and can be fixed in a lifting installation manner, which is convenient for installation and maintenance. After the anaerobic ammonium oxidation filler is enriched, it is also convenient to take it out and observe the sludge granulation state; 4. The present invention adjusts the gas lift reflux ratio and thus controls the dissolved oxygen by controlling the gas lift aeration volume. According to the difference in dissolved oxygen between the front and rear ends, the packing area is spatially separated from each main reaction area, so that the reaction proceeds in an orderly manner. 5. The present invention only arranges aeration in the air stripping area, and no aeration in the filler area, which reduces disturbance to the filler and is conducive to the enrichment and formation of granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the high-ammonia nitrogen wastewater treatment system disclosed in the present invention; Figure 2 for Figure 1 Schematic diagram of AA in the middle; Figure 3 for Figure 1 Schematic diagram of the middle BB; Figure 4 for Figure 1 Schematic diagram of CC.

[0018] In the figure: 1. Influent homogenization regulating tank; 2. Filler reaction zone; 3. Sludge sedimentation zone; 4. Air lift zone; 5. Anaerobic ammonia oxidation hanging filler; 6-1. First guide plate; 6-2. Second guide plate; 7. Guide wall; 8. Inclined plate; 9. Sludge hopper; 10. Special-shaped communicating vessel; 11. Air lift device; 12. Water inlet; 13. Sludge return outlet; 14. Water outlet; 15. Sludge return inlet. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 are within the scope of protection of the present invention.

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1-4 As shown, the present invention provides a high-ammonia nitrogen wastewater treatment system, comprising: a tank body; the tank body is provided with an inlet homogenization regulating tank 1, a filler reaction zone 2, a sludge precipitation zone 3 and a gas stripping zone 4 in sequence along the wastewater treatment direction; wherein, The inlet homogenizing regulating tank 1 of the present invention is provided with an inlet 12, and the high ammonia nitrogen wastewater enters the inlet homogenizing regulating tank 1 through the inlet 12, and is mixed with the gas-water mixture refluxed from the gas stripping area 4 in the inlet homogenizing regulating tank 1.

[0021] The packing reaction zone 2 of the present invention is provided with an anaerobic ammonium oxidation suspension packing 5 and the mud-water mixture flows in the packing reaction zone 2 in an up-and-down baffled manner. Specifically: a plurality of first guide plates 6-1 and second guide plates 6-2 are arranged in an alternating manner in the packing reaction zone 2, the first guide plates 6-1 and the second guide plates 6-2 are arranged vertically and the top of the second guide plate 6-2 is higher than the top of the first guide plate 6-1, the first guide plates 6-1 and the second guide plates 6-2 divide the packing reaction zone 2 into a plurality of packing reaction sub-zones, a sludge return inlet 15 and a water distribution hole connected to the inlet homogenization regulating tank 1 are provided on the most upstream packing reaction sub-zone, the sludge return inlet 15 is connected to the sludge return outlet 13 of the sludge sedimentation zone 3; an anaerobic ammonia oxidation suspension packing 5 is installed in each of the packing reaction sub-zones, the anaerobic ammonia oxidation suspension packing 5 is formed by connecting square hydrophilic polyurethane packing in series, and the anaerobic ammonia oxidation suspension packing is fixed by upper suspension; the internal pore size of the square hydrophilic polyurethane packing is 1-2 mm, and the small pore size is conducive to the anaerobic ammonia oxidation sludge biofilm and granulation. The first guide plate 6-1 is connected to the bottom of the tank body, and the second guide plate 6-2 and the bottom of the tank body have a flow passage; the mud-water mixture in the upstream packing reaction sub-zone flows into the downstream packing reaction sub-zone through the flow passage at the bottom of the second guide plate 6-2, or the mud-water mixture in the upstream packing reaction sub-zone overflows into the downstream packing reaction sub-zone through the top of the first guide plate 6-1; based on this, the mud-water mixture flows in the packing reaction zone in an up-and-down baffle manner. Further, a guide wall 7 is provided at the lower end of the first guide plate 6-1 of the present invention, and the inclination angle of the guide wall 7 is 45-60° to prevent the sludge from settling in the right-angle area to form a dead zone.

[0022] The middle part of the sludge sedimentation area 3 of the present invention is provided with an inclined plate 8 for intercepting sludge; the bottom of the sludge sedimentation area 3 is provided with a trapezoidal sludge hopper 9, and the bottom of the sludge hopper 9 is provided with a sludge return outlet 13, and the sludge return outlet 13 below the sedimentation tank is connected to the sludge return inlet 15 of the filler reaction area 2 through a pump, and part of the sludge returns to the front end of the filler reaction area through the sludge return outlet; the upper area of ​​the inclined plate is provided with a water outlet, and the clean water outlet above the inclined plate allows the outlet water to flow into the next unit by gravity; the area between the inclined plate 8 and the sludge hopper 9 is connected by a special-shaped The bottom of the stripping zone is connected to the device 10, and the upper height of the special-shaped communicating vessel is higher than the upper height of the sludge hopper, which is used to reduce the sludge entering the special-shaped communicating vessel, and then reduce the amount of sludge entering the stripping zone; wherein the special-shaped communicating vessel is composed of a vertical section at the top and an inclined section at the bottom, and the inclined section is inclined toward the bottom of the stripping zone; a stripping device 11 is provided at the bottom of the stripping zone 4, and the stripping device 11 sends the gas-water mixture into the inlet homogenization regulating tank in the form of air stripping, and the gas-water mixture is mixed with the high-ammonia nitrogen wastewater entering through the water inlet in the inlet homogenization regulating tank. wherein the width of the stripping zone 4 along the inlet flow direction is less than the length perpendicular to the inlet flow direction, that is, the width is narrow and the length is long; the stripping device 11 is a long strip microporous aeration component arranged at the bottom of the length direction of the stripping zone, and the microporous aeration component is connected to a fan, and the fan can be a rotary fan, a Roots fan, etc., and the air volume is used to adjust the air stripping reflux water volume and the dissolved oxygen in the entire filler reaction zone.

[0023] The present invention provides a method for treating high-ammonia nitrogen wastewater, comprising: Step 1, high ammonia nitrogen wastewater enters the inlet homogenization regulating tank through the water inlet, and is mixed with the gas stripping reflux effluent from the gas stripping area in the inlet homogenization regulating tank; wherein, the dissolved oxygen in the inlet homogenization regulating tank is controlled to be 0.4-0.5 mg / L; at the same time, an alkali solution dosing device is provided to control the pH of the inlet homogenization regulating tank to be 7.5-8.5, and the inlet alkalinity is greater than 4 times the ammonia nitrogen concentration; Step 2, the wastewater overflows from the inlet homogenization regulating tank into the packing reaction zone to carry out nitrite and anaerobic ammonium oxidation reactions; wherein the packing reaction zone contains a small amount of suspended nitrite sludge, and the anaerobic ammonium oxidation suspended packing is mainly anaerobic ammonium oxidation granular sludge; the incoming water entering the packing reaction zone reacts continuously during the deflection process to reduce sludge sedimentation; wherein the dissolved oxygen in the packing reaction zone is controlled at 0.1-0.3 mg / L, and the pH is controlled at 7.5-8.5 to ensure the activity of nitrite and anaerobic ammonium oxidation sludge; Step 3, the sludge-water mixture after the anaerobic ammonia oxidation reaction enters the sludge sedimentation area from the outlet tank at the end of the packing reaction area, the sludge enters the sludge hopper for sedimentation, the settled sludge is discharged from the sludge return outlet, and refluxes to the front end of the packing reaction area through the sludge return pump for sludge replenishment; Step 4: The sewage after preliminary sedimentation in the sludge sedimentation area flows into the gas stripping area through a special-shaped communicating vessel from the top of the sludge hopper to the bottom of the gas stripping area. The special-shaped communicating vessel reduces the sludge entering the gas stripping area while ensuring the sludge sedimentation, and prevents the sludge from being inactivated due to excessive aeration; the clean water in the area above the inclined plate of the sludge sedimentation area is discharged through the outlet; Step 5: The wastewater entering the gas stripping area releases gas through the gas stripping area, raising the liquid level in the gas stripping area. The gas-water mixture enters the inlet homogenization regulating tank through the overflow tank and is fully mixed with the incoming water, and enters the subsequent circulation reaction to form a closed loop.

[0024] Among them, nitrite suspended sludge is added into the filler reaction zone to provide nitrite and anaerobic ammonia oxidizing bacteria; the mud-water hybrid power in the filler reaction zone comes from the power brought by the air lift reflux and the power mixing brought by the upper and lower baffles, thereby achieving efficient mixing while reducing sludge sedimentation.

[0025] The dissolved oxygen in the packing reaction zone is controlled by the amount of oxygen brought by the gas lift reflux, and the dissolved oxygen in the anaerobic ammonium oxidation reaction zone is adjusted to 0.1-0.3 mg / L by the gas lift amount to ensure the progress of nitrite and anaerobic ammonium oxidation reactions. Example

[0026] The present invention provides a denitrification reactor and treatment method for low carbon-nitrogen ratio high ammonia nitrogen wastewater, wherein the low carbon-nitrogen ratio high ammonia nitrogen wastewater (C / N ratio is less than 2) is anaerobic effluent from a pharmaceutical industry, with a pH between 7 and 8, a COD of 1100 mg / L, an ammonia nitrogen of about 600 mg / L, a total nitrogen of about 650 mg / L, and an alkalinity of about 2000 mg / L. The specific treatment process is as follows: S1. Wastewater with low carbon-nitrogen ratio and high ammonia nitrogen enters the inlet homogenization regulating tank 1 through the water inlet 12 through a pump. Under the appropriate conditions of wastewater pH and alkalinity, there is no need to add liquid alkali to adjust the pH and alkalinity; the wastewater entering through the water inlet 12 is mixed with the gas-water mixture produced by aeration in the gas stripping area 4 in the inlet homogenization regulating tank 1; wherein, the dissolved oxygen in the inlet homogenization regulating tank 1 is controlled at about 0.3-0.4 mg / L.

[0027] S2. The mixed wastewater in the inlet homogenization regulating tank 1 enters the packing reaction zone 2 through the upper overflow tank. The packing reaction zone 2 is provided with an anaerobic ammonium oxidation hanging packing 5. The packing reaction zone 2 is inoculated with nitrite suspended sludge, and the sludge concentration is about 3000-4000 mg / L; the flocculent and granular anaerobic ammonium oxidation sludge is enriched on the anaerobic ammonium oxidation hanging packing 5, and the sludge concentration is maintained at 4000-5000 mg / L.

[0028] S3, the influent is mixed with the suspended sludge in the packing reaction zone 2, and driven by hydraulic force and the action of the first guide plate 6-1 and the second guide plate 6-2, the mud-water mixture is turned up and down in multiple sections of the packing reaction zone for mixing and reaction, and fully contacts and reacts with the suspended anaerobic ammonia oxidation packing. After continuous mixing and reaction, the mud-water mixture enters the sludge sedimentation zone 3 from the outlet tank at the end of the packing zone.

[0029] S4, the dissolved oxygen at the front end of the packing reaction zone 2 is relatively high, in the range of 0.3-0.4 mg / L, which is conducive to the priority of nitrite reaction. As the reaction proceeds and the dissolved oxygen is consumed, the dissolved oxygen at the rear end of the packing reaction zone 2 gradually decreases to 0.1-0.3 mg / L, and the anaerobic ammonium oxidation reaction is mainly carried out, which also separates the anaerobic ammonium oxidation reaction in space and ensures the effective progress of the reaction.

[0030] S5. The sludge entering the sludge sedimentation area 3 is intercepted by the inclined plate 8 and slowly deposited in the sludge hopper 9. The deposited sludge is sent back to the sludge return inlet 15 at the front end of the biochemical reaction through the sludge return outlet 13 for sludge replenishment. The sludge return amount is controlled at 1-2 times the water inlet amount.

[0031] S6, the clear water after the sludge and water separation in the sludge sedimentation area 3 has ammonia nitrogen of 85mg / L, total nitrogen of 140mg / L, and COD of about 740mg / L respectively, and the effluent is directly discharged into the next level of sewage treatment process. After the treatment of this reactor, the ammonia nitrogen removal rate of the influent can reach 85%, the total nitrogen removal rate can reach more than 75%, and the COD synergistic removal rate is about 30%.

[0032] S7, part of the clean water enters the air stripping area 4 through the special-shaped interconnection area to ensure the amount of water required for air stripping reflux. The aeration membrane assembly at the bottom of the air stripping area is connected to the fan, and the fan can adjust the air volume with variable frequency to ensure the air stripping reflux volume and the required dissolved oxygen. The density of the gas-water mixture formed by the air stripping action is reduced, which raises the liquid level of the entire air stripping area. The gas-water mixture passes through the partition wall between the air stripping area and the inlet homogenization regulating tank 1 and enters the inlet homogenization regulating tank 1 to mix with the high-concentration incoming water for cyclic reaction removal.

[0033] S8. The incoming water is treated through continuous circulation of the reactor, and most of the ammonia nitrogen and total nitrogen in the water are removed to meet the requirements of subsequent conventional biochemical treatment.

[0034] The advantages of the present invention are: 1. The reaction system of the present invention integrates water inlet, anaerobic ammonium oxidation filler reaction zone, sludge sedimentation zone, gas stripping reflux zone, sludge reflux and gas stripping reflux, with compact structure and high efficiency integration; 2. The packing reaction zone of the present invention adopts a baffle design and is divided into a plurality of interconnected reaction areas. By folding, the reaction mixing efficiency of the mud-water mixture and the anaerobic ammonium oxidation suspension packing is improved, thereby improving the anaerobic ammonium oxidation reaction efficiency; 3. The anaerobic ammonium oxidation hanging filler of the present invention is assembled in series and can be fixed in a lifting installation manner, which is convenient for installation and maintenance. After the anaerobic ammonium oxidation filler is enriched, it is also convenient to take it out and observe the sludge granulation state; 4. The present invention adjusts the gas lift reflux ratio and thus controls the dissolved oxygen by controlling the gas lift aeration volume. According to the difference in dissolved oxygen between the front and rear ends, the packing area is spatially separated from each main reaction area, so that the reaction proceeds in an orderly manner. 5. The present invention only arranges aeration in the air stripping area, and no aeration in the filler area, which reduces disturbance to the filler and is conducive to the enrichment and formation of granular sludge.

[0035] The above are only preferred embodiments of the present invention and are 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 system for treating high-ammonia nitrogen wastewater, characterized in that: include: Pool body; The tank body is provided with a water inlet homogenization regulating tank, a filler reaction zone, a sludge sedimentation zone and an air stripping zone in sequence along the wastewater treatment direction; The inlet homogenization regulating tank is provided with a water inlet, the packing reaction zone is provided with an anaerobic ammonia oxidation hanging packing and the mud-water mixture flows in the packing reaction zone in an up-and-down baffled manner, the middle of the sludge sedimentation zone is provided with an inclined plate, the bottom of the sludge sedimentation zone is provided with a sludge hopper, the area between the inclined plate and the sludge hopper is connected with the bottom of the gas stripping zone, the bottom of the sludge hopper is provided with a sludge reflux outlet, part of the sludge flows back to the front end of the packing reaction zone through the sludge reflux outlet, and a water outlet is provided in the upper area of ​​the inclined plate; the bottom of the gas stripping zone is provided with a gas stripping device, the gas stripping device sends the gas-water mixture into the inlet homogenization regulating tank in a gas stripping manner, and the gas-water mixture in the inlet homogenization regulating tank is mixed with the high-ammonia nitrogen wastewater entering through the water inlet.

2. The high-ammonia nitrogen wastewater treatment system according to claim 1, characterized in that: The packing reaction zone is provided with a plurality of first guide plates and second guide plates which are alternately distributed at intervals, the top of the second guide plate is higher than the top of the first guide plate, the first guide plate and the second guide plate divide the packing reaction zone into a plurality of packing reaction sub-zones, the most upstream packing reaction sub-zone is provided with a sludge return inlet and a water distribution hole connected to the inlet homogenization regulating tank, the sludge return inlet is connected to the sludge return outlet; each of the packing reaction sub-zones is installed with an anaerobic ammonia oxidation hanging packing; the first guide plate is connected to the bottom of the tank body, and a flow channel is left between the second guide plate and the bottom of the tank body; the mud-water mixture in the upstream packing reaction sub-zone flows into the downstream packing reaction sub-zone through the flow channel at the bottom of the second guide plate, or the mud-water mixture in the upstream packing reaction sub-zone overflows into the downstream packing reaction sub-zone through the top of the first guide plate; based on this, the mud-water mixture flows in the packing reaction zone in an up-and-down baffle manner.

3. The high-ammonia nitrogen wastewater treatment system according to claim 2, characterized in that: A guide wall is arranged at the lower end of the first guide plate, and the guide wall has an inclination angle of 45-60° to prevent sludge from settling in a right-angle area to form a dead zone.

4. The system for treating high-ammonia nitrogen wastewater according to claim 1, characterized in that: The anaerobic ammonium oxidation suspension filler is formed by connecting square hydrophilic polyurethane fillers in series, and the anaerobic ammonium oxidation suspension filler is fixed by upper suspension; the inner pore diameter of the square hydrophilic polyurethane filler is 1-2 mm.

5. The high-ammonia nitrogen wastewater treatment system according to claim 1, characterized in that: The end of the packing reaction zone is connected to the sludge sedimentation zone through a water trough; a special-shaped communicating vessel is arranged on one side of the sludge hopper of the sludge sedimentation zone, and is connected to the bottom of the gas stripping zone through the special-shaped communicating vessel, and the upper height of the special-shaped communicating vessel is higher than the upper height of the sludge hopper.

6. The system for treating high-ammonia nitrogen wastewater according to claim 1, characterized in that: The width of the stripping zone along the influent direction is smaller than the length perpendicular to the influent direction; the stripping device is a long strip microporous aeration component arranged at the bottom of the stripping zone in the longitudinal direction, and the microporous aeration component is connected to a fan.

7. A method for treating high-ammonia nitrogen wastewater, based on the high-ammonia nitrogen wastewater treatment system according to any one of claims 1 to 6, characterized in that: include: Step 1, high ammonia nitrogen wastewater enters the inlet homogenization regulating tank through the water inlet, and is mixed with the gas stripping reflux effluent from the gas stripping area in the inlet homogenization regulating tank; wherein, the dissolved oxygen in the inlet homogenization regulating tank is controlled to be 0.4-0.5 mg / L; at the same time, an alkali solution dosing device is provided to control the pH of the inlet homogenization regulating tank to be 7.5-8.5, and the inlet alkalinity is greater than 4 times the ammonia nitrogen concentration; Step 2, the wastewater overflows from the inlet homogenization regulating tank into the packing reaction zone to carry out nitrite and anaerobic ammonium oxidation reactions; wherein the packing reaction zone contains suspended nitrite sludge, and the anaerobic ammonium oxidation suspended packing is mainly anaerobic ammonium oxidation granular sludge; the incoming water entering the packing reaction zone reacts continuously during the deflection process; wherein the dissolved oxygen in the packing reaction zone is controlled at 0.1-0.3 mg / L, and the pH is controlled at 7.5-8.5 to ensure the activity of nitrite and anaerobic ammonium oxidation sludge; Step 3, the sludge-water mixture after the anaerobic ammonia oxidation reaction enters the sludge sedimentation area from the outlet tank at the end of the packing reaction area, the sludge enters the sludge hopper for sedimentation, the settled sludge is discharged from the sludge return outlet, and refluxes to the front end of the packing reaction area through the sludge return pump for sludge replenishment; Step 4, the sewage after preliminary sedimentation in the sludge sedimentation area flows into the gas stripping area through the special-shaped connecting vessel from the top of the sludge hopper to the bottom of the gas stripping area, and the clean water in the area above the inclined plate of the sludge sedimentation area is discharged through the outlet; Step 5: The wastewater entering the gas stripping area releases gas through the gas stripping area, raising the liquid level in the gas stripping area. The gas-water mixture enters the inlet homogenization regulating tank through the overflow tank and is fully mixed with the incoming water, and enters the subsequent circulation reaction to form a closed loop.

8. The method for treating high-ammonia nitrogen wastewater according to claim 7, characterized in that: The packing reaction zone is doped with nitrite suspended sludge to provide nitrite and anaerobic ammonia oxidation bacteria; the mud-water hybrid power in the packing reaction zone comes from the power brought by the air lift reflux and the power brought by the upper and lower baffles.

9. The method for treating high-ammonia nitrogen wastewater according to claim 7, characterized in that: The dissolved oxygen control of the packing reaction zone comes from the amount of oxygen brought by the gas lift reflux. The dissolved oxygen in the anaerobic ammonium oxidation reaction zone is adjusted to 0.1-0.3 mg / L by the gas lift amount to ensure the progress of nitrite and anaerobic ammonium oxidation reactions.

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