Biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater

Abstract

The present invention discloses a biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater, which belongs to the field of production wastewater treatment in the explosives industry. The present invention includes a reflux aeration tank, a contact mixing tank, a biochemical neutralization tank, a sedimentation tank, an automatic control cabinet, a reflux pump, an aeration fan, a water distribution plate, a guide plate, a pH probe, an aeration zone, an aerator, a DO probe, a filler zone, a transverse guide plate and a water inlet pump; a partition is used to set up four units of a reflux aeration tank, a contact mixing tank, a biochemical neutralization tank and a sedimentation tank in series; an aerator is provided at the bottom of the reflux aeration tank, and the biochemical neutralization tank is divided into a filler zone and an aeration zone. A biological filler is provided in the middle of the filler zone, and an aerator is provided at the bottom of the aeration zone; a vertical guide plate is provided on the water inlet side of the sedimentation tank, and a horizontal downward water distribution plate is provided at the bottom of the guide plate; the device enables the wastewater treatment facility to operate stably while reducing the maintenance cost of process equipment, significantly reducing the treatment pressure of the subsequent sewage treatment process.

Description

Technical Field

[0001] The invention discloses a biochemical neutralization treatment method and an integrated device for high-acidity HMX production wastewater, belonging to the field of production wastewater treatment in the explosives industry. Background Art

[0002] Octogen (HMX), chemical name cyclotetramethylene tetranitramine, is currently the single explosive with the best comprehensive performance; it is widely used in missiles, nuclear weapons, anti-tank warhead charges and high-performance solid propellants, gun propellant charges. At present, the main production method of HMX is the acetic anhydride method, and a large amount of acetic anhydride and acetic acid (acetic acid) substances are used and produced during the production process. However, the yield of this method is not high, and a large amount of HMX production wastewater will be produced after HMX refining and distillation; not only may there be residual HMX and its intermediates and other difficult-to-degrade substances, but also high concentrations of acetic acid, which makes its acidity and organic pollutant index (COD) extremely high. Therefore, in the existing HMX production wastewater treatment process, it is necessary to first add a large amount of strong alkaline agents, such as sodium hydroxide, calcium hydroxide, etc., and use chemical neutralization methods to adjust the wastewater pH to neutral conditions, and then carry out corresponding subsequent treatment. However, in actual production, the chemical neutralization process often causes a large amount of insoluble substance deposition, serious pipeline blockage and equipment corrosion. It not only affects the stable operation of wastewater treatment facilities, but also increases the maintenance cost of process equipment; at the same time, the large amount of chemical agents added also makes the wastewater treatment cost high. Therefore, the neutralization treatment of high-acidity HMX production wastewater has become a difficult point in the pollution prevention and control work of related explosives manufacturers.

[0003] Among the numerous sewage treatment technologies, the biochemical method is economical, efficient, broad-spectrum, and green and environmentally friendly. It has been widely used as the core process method for various sewage treatment projects. Exploring new and efficient biological treatment technologies is also a research hotspot in the current field of explosive production wastewater treatment. Taking advantage of the characteristics of organisms, especially microorganisms, such as large number of species, rich functions, and strong environmental tolerance, we carry out process innovation integration to develop an environmentally friendly, low-cost, and stable high-acidity HMX production wastewater biochemical neutralization treatment technology for the explosive production industry to better achieve pollution prevention and control and clean production in the HMX production process. It has urgent practical significance and high application value. Summary of the invention

[0004] In order to solve the problem that the existing chemical neutralization treatment process of high-acidity HMX production wastewater is prone to cause a large amount of insoluble matter deposition, serious pipeline blockage and equipment corrosion, the present invention discloses a biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater. Without adding alkaline chemical neutralizers, the pH of the treated high-acidity HMX production wastewater can reach a neutral range through the biochemical treatment process alone; and the main pollution indicators can be greatly reduced simultaneously. It effectively eliminates the disadvantages of the existing chemical neutralization process that is prone to cause a large amount of insoluble matter deposition, serious pipeline blockage and equipment corrosion, enables the wastewater treatment facilities to operate stably, and reduces the maintenance cost of process equipment, greatly reducing the treatment pressure of subsequent sewage treatment processes.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The present invention discloses a biochemical neutralization treatment method for high-acidity HMX production wastewater:

[0007] Step 1: The high-acidity HMX production wastewater from the acetic anhydride HMX synthesis production line of the explosives factory and the refined distillation first enters the contact mixing tank and is mixed with the aerated water from the reflux aeration tank in the biochemical neutralization system according to the set ratio of 1:0.85~1·C 酸度 Mixed (C 酸度 is the total acidity value of HMX production wastewater, expressed in g NaOH / L), ensuring that the effluent pH of the mixing tank is ≥3.5.

[0008] Step 2: The effluent from the contact mixing tank enters the biochemical neutralization tank; the flow state of the biochemical neutralization tank is completely mixed, which enhances the buffering capacity against the impact of high acidity of wastewater; the acidity load of the biochemical neutralization tank is set at 800-1200g NaOH / (m 3 ·d), and the retention time is not less than 12 hours; biological fillers are set in the biochemical neutralization tank for the enrichment and growth of acid-resistant and alkali-producing microorganisms. Microorganisms exist in the biochemical neutralization tank in the form of biofilm and activated sludge, and the biomass (MLSS) in the biochemical neutralization tank is controlled in the range of 7500-15000 mg / L; an aerator is set in the biochemical neutralization tank, and the microbial biological oxidation adopts aerobic oxidation to control the dissolved oxygen (DO) in the biochemical neutralization tank ≥3 mg / L to accelerate the degradation rate of pollutants and the discharge of acidic metabolites in the system; the pH of the mixed liquor in the biochemical neutralization tank is monitored simultaneously, and the pH of the mixed liquor is maintained at ≥6.5; if the pH of the mixed liquor is lower than 6.5, the inflow of raw wastewater is stopped until the pH of the mixed liquor in the biochemical neutralization tank is restored to above 7.

[0009] The biological filler adopts polyethylene spherical suspended filler, which has the characteristics of strong biological attachment ability, good chemical and biological stability, large specific surface area, high porosity, strong hydrophilicity, etc. When the biochemical neutralization tank is working, the filler of the growing microorganisms will be suspended in the water with aeration and stirring in the tank and fluidized evenly in the whole tank. In the process of fluidization, the filler will cut and disperse the bubbles, so that the gas distribution is uniform and the oxygen utilization rate is improved.

[0010] The microorganisms (activated sludge and biofilm) used in the present invention are obtained by acclimating, culturing and enriching the aerobic pool sludge of the comprehensive wastewater treatment station of the relevant explosives factory in the biochemical neutralization system. The initial inoculated sludge concentration MLSS of the biological neutralization system is about 10000 mg / L, the culture temperature is 20-30°C, and the method of gradually increasing the influent load of high-acid HMX wastewater is adopted for acclimation and cultivation; after 30-60 days of cultivation, the microbial properties, biochemical neutralization efficiency and pollutant removal indicators in the biochemical neutralization system tend to be stable, and the system can be continuously and stably operated.

[0011] Step 3: The mixed liquid effluent from the biochemical neutralization tank enters the sedimentation tank for mud-water separation; the activated sludge is returned to the biochemical neutralization tank after sedimentation to replenish the microbial biomass of the biochemical neutralization tank; the effluent after clarification is partly sent to subsequent sewage comprehensive treatment facilities for treatment or discharged after testing to meet the standards, and partly returned to the effluent return aeration tank.

[0012] Step 4: Part of the qualified wastewater is discharged, and part enters the return aeration tank as system effluent to participate in wastewater neutralization. The return volume of the effluent return aeration tank is controlled at 0.85~1·C 酸度 Q HMX废水 Among them, C 酸度 is the total acidity of HMX production wastewater, expressed in g NaOH / L; Q HMX废水 Indicates the water inflow of the HMX production wastewater system; an air aerator is installed in the aeration tank to control the DO in the aeration tank ≥ 8mg / L, strengthen the stripping of acidic metabolites in the effluent, and make the pH value of the return water after aeration greater than 8, thereby improving its ability to dilute and neutralize acidic wastewater; the residence time of the return aeration tank is not less than 30min.

[0013] The device comprises: a reflux aeration tank, a contact mixing tank, a biochemical neutralization tank, a sedimentation tank, an automatic control cabinet, a reflux pump, an aeration fan, a water distribution plate, a guide plate, a pH probe, an aeration area, an aerator, a DO probe, a filler area, a transverse guide plate and a water inlet pump.

[0014] The main body of the device is in the shape of a regular rectangular parallelepiped, and four units, namely, a return aeration tank, a contact mixing tank, a biochemical neutralization tank, and a sedimentation tank, are arranged in series with partitions inside. An aerator is provided at the bottom of the return aeration tank, and a flow hole is provided at the bottom of the partition between the return aeration tank and the contact mixing tank. An HMX production wastewater inlet is provided at the bottom of the contact mixing tank and is connected to the HMX production wastewater inlet pipeline. A flow hole is provided at the upper part of the partition between the contact mixing tank and the biochemical neutralization tank; the biochemical neutralization tank is divided into two areas, a filling area and an aeration area. A partition is provided between the filling area and the aeration area, and flow holes are provided at the upper part and the bottom of the partition; a biological filler with high adhesion and large specific surface area is provided in the middle of the filling area for the enrichment and growth of acid-resistant and alkali-producing microorganisms. A place is provided; an aerator is arranged at the lower part of the aeration zone; a partition is arranged between the biochemical neutralization tank and the sedimentation tank, flow holes are provided at the upper part and the bottom of the partition, a vertical guide plate is arranged on the water inlet side of the sedimentation tank, a horizontal downward water distribution plate is arranged at the lower part of the guide plate, and a mud hopper inclined toward the biochemical neutralization tank is arranged at the lower part of the sedimentation tank; a water outlet is arranged above the side wall of the sedimentation tank, a return water pipeline branch is arranged on the water outlet pipeline connected to the water outlet, and a return water pipeline is provided on the return water pipeline; the space below the mud hopper of the sedimentation tank is set as a device room, and an aeration fan, a return pump, a water inlet pump, an automatic control cabinet and some pipelines are placed.

[0015] The side walls of the recirculation aeration tank are alternately provided with guide baffles with one end open, which promote the full mixing of bubbles and recirculation water by changing the direction and speed of bubble upflow, thereby improving the stripping efficiency.

[0016] A DO probe is arranged inside the reflow aeration tank and is connected to a control cabinet. The aeration volume is controlled by detecting the DO value in the reflow aeration tank.

[0017] A water inlet pump is arranged on the HMX water inlet pipeline and connected to the control cabinet to control the water inlet flow rate;

[0018] The side walls of the contact mixing tank are alternately provided with flow guide baffles with one end open to prevent overcurrent short circuit and promote full mixing of HMX production wastewater and return water.

[0019] A pH probe is arranged on the upper part of the contact mixing tank to detect the pH value in the contact mixing tank online, and is connected to the control cabinet to control the effluent reflux amount of the device by adjusting the effluent reflux pump.

[0020] A DO probe is provided on the upper part of the packing area of ​​the biochemical neutralization tank to detect the DO value in the recirculation aeration tank online, and is connected to the control cabinet to ensure that DO ≥ 3 mg / L;

[0021] A pH probe is provided on the upper part of the aeration zone of the biochemical neutralization tank to synchronously monitor the pH of the mixed liquid in the biochemical neutralization tank and is connected to the control cabinet to ensure that the pH of the mixed liquid is ≥6.5; if the pH of the mixed liquid is lower than 6.5, the water inlet pump is closed and the inflow of raw wastewater is stopped until the pH of the mixed liquid in the biochemical neutralization tank is restored to above 7.

[0022] The aeration fan is connected to the aerator of the reflux aeration tank and the aerator in the aeration zone of the biochemical neutralization tank respectively. The aerator in the reflux aeration tank is used to aerate and blow off the acidic metabolites contained in the reflux effluent of the device to increase the pH value; the aerator in the aeration zone of the biochemical neutralization tank oxygenates the mixed liquid through air aeration, blows off the acidic metabolites formed by the biochemical reaction, and provides power for the water flow to rise;

[0023] The automatic control cabinet is connected with the pH probe, the DO probe, the reflux pump, the water inlet pump and the aeration fan through a control line.

[0024] Beneficial effects:

[0025] 1. The biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater disclosed in the present invention overcome the problems of large dosage of strong alkaline chemicals, pipeline blockage and serious equipment corrosion in the existing chemical neutralization process. There is no need to add strong alkaline chemicals, which is environmentally friendly, low-cost and has stable effects. It can provide a new solution for the neutralization of high-acidity wastewater generated in the production of related explosives.

[0026] 2. The biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater disclosed in the present invention have reasonable layout, compact structure, small footprint, flexible application scenarios, and can realize on-site neutralization treatment of high-acidity HMX production wastewater.

[0027] 3. The biochemical neutralization treatment method and integrated device for high-acidity HMX production wastewater disclosed in the present invention have no moving parts inside the device, reliable performance, and can achieve automatic control according to changes in incoming water quality and operating conditions, and have high practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A process flow for biochemical neutralization treatment of high-acidity HMX production wastewater.

[0029] Figure 2 This is a schematic diagram of a biochemical neutralization treatment device for high-acidity HMX production wastewater.

[0030] Among them: 1-return aeration tank, 2-contact mixing tank, 3-biochemical neutralization tank, 4-sedimentation tank, 5-automatic control cabinet, 6-return pump, 7-aeration fan, 8-water distribution plate, 9-guide plate, 10-pH probe, 11-aeration area, 12-aerator, 13-DO probe, 14-filling area, 15-lateral guide plate, 16-water inlet pump. DETAILED DESCRIPTION

[0031] The present invention will be further described with reference to the accompanying drawings:

[0032] The present embodiment discloses a biochemical neutralization treatment method and an integrated device for high-acidity HMX production wastewater, comprising a reflux aeration tank 1, a contact mixing tank 2, a biochemical neutralization tank 3, a sedimentation tank 4, an automatic control cabinet 5, a reflux pump 6, an aeration fan 7, a water distribution plate 8, a guide plate 9, a pH probe 10, an aeration area 11, an aerator 12, a DO probe 13, a filler area 14, a transverse guide plate 15, and a water inlet pump 16.

[0033] The main body of the device is in the shape of a regular rectangular parallelepiped, and four units, a reflow aeration tank 1, a contact mixing tank 2, a biochemical neutralization tank 3, and a sedimentation tank 4, are arranged in series with partitions. An aerator 12 is provided at the bottom of the reflow aeration tank 1, a flow hole is provided at the bottom of the partition between the reflow aeration tank 1 and the contact mixing tank 2, an HMX production wastewater inlet is provided at the bottom of the contact mixing tank 2 and connected to the HMX production wastewater inlet pipeline, and the HMX production wastewater is pumped in by the water inlet pump 16; the HMX production wastewater first enters the contact mixing tank 2 and is mixed with the aerated return water from the reflow aeration tank 1; a flow hole is provided at the upper part of the partition between the contact mixing tank 2 and the biochemical neutralization tank 3; after mixing with the return water, the HMX production wastewater enters the biochemical neutralization tank 3; the biodegradation and neutralization process of acidic organic pollutants occurs in the biochemical neutralization tank 3; finally, it enters the sedimentation tank 4, and after the mud and water are separated, the sludge flows back to the biochemical neutralization tank 3; part of the effluent from the sedimentation tank 4 flows back to the reflow aeration tank 1, is fully aerated to blow off the acidic metabolites, and further improves the pH value of the return effluent; the rest of the effluent from the sedimentation tank 4 is used as the effluent after biochemical neutralization and enters the subsequent treatment process or is discharged.

[0034] The biochemical neutralization tank 3 is divided into two areas: a packing area 14 and an aeration area 11; a partition is arranged between the packing area 14 and the aeration area 11, and flow holes are provided on the upper and bottom of the partition; a DO probe 13 is arranged on the upper part of the packing area 14, which is connected to the automatic control cabinet 5 to ensure that DO ≥ 3 mg / L; biological packing is arranged in the middle; an aerator 12 is arranged at the lower part of the aeration area 11, and air is supplied by the aeration fan 7; the aerator 12 can provide power for the rising water flow during aeration, forming a circulation between the packing area 14 and the aeration area 11, so that the biochemical neutralization tank 3 is in a completely mixed state; a pH probe 10 is arranged on the upper part of the aeration area, which is connected to the automatic control cabinet 5 to maintain the pH of the mixed liquid ≥ 6.5; if the pH of the mixed liquid is lower than 6.5, the water inlet pump 16 is turned off to stop the inflow of raw wastewater until the pH of the mixed liquid in the biochemical neutralization tank is restored to above 7.

[0035] A vertical guide plate 9 is provided on the water inlet side of the sedimentation tank 4, and a horizontal downward water distribution plate 8 is provided at the lower part of the vertical guide plate 9; a mud bucket inclined toward the side of the biochemical neutralization tank 3 is provided at the lower part of the sedimentation tank 4. The space below the mud bucket of the sedimentation tank 4 can be set as an equipment room, where the aeration fan 7, the return pump 6, the water inlet pump 16 and the automatic control cabinet 5 and other related equipment, instruments and some pipelines are placed.

[0036] Example 1

[0037] (1) The high-acid wastewater generated during the HMX production process of a certain factory has a pH of 2.1, a COD of 96500 mg / L, and an acidity of 64 g NaOH / L. After entering the contact mixing tank 2, it is fully mixed with the aerated process effluent from the return aeration tank 1 at a ratio of 1:60. The pH of the effluent from the contact mixing tank 2 is 3.57.

[0038] (2) The effluent from the contact mixing tank 2 enters the biochemical neutralization tank 3. The acidity load in the neutralization tank is 1067 g NaOH / (m 3 ·d), stay for 12 hours, and under the biological oxidation action of microorganisms, a series of biochemical neutralization reactions will be carried out to simultaneously reduce the acidity and COD of the wastewater.

[0039] (3) The mixed liquid in the biochemical neutralization tank 3 enters the sedimentation tank 4 for mud and water separation; the activated sludge in the mud hopper of the sedimentation tank 4 is precipitated and then flows back to the biochemical neutralization tank 3 to replenish the microbial biomass in the biochemical neutralization tank 3.

[0040] (4) After clarification, part of the effluent from the sedimentation tank 4 is returned to the effluent return aeration tank 1 for further aeration to remove the residual acidic metabolites therein, thereby controlling the DO to about 8 mg / L and the pH to about 8.10.

[0041] (5) After clarification, part of the effluent from sedimentation tank 4 is used as effluent after biochemical neutralization. Its pH reaches 7.42 and COD is reduced to 78 mg / L, which is a significant improvement in water quality compared to the original wastewater.

[0042] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A biochemical neutralization treatment method for high-acidity HMX production wastewater, characterized by: The steps include: Step 1: The high-acidity HMX production wastewater from the acetic anhydride HMX synthesis production line of the explosives factory and the refined distillation first enters the contact mixing tank and is mixed with the aerated water from the reflux aeration tank in the biochemical neutralization system according to the set ratio of 1:0.85~1·C 酸度 Mixing, ensuring that the pH of the effluent from the mixing tank is ≥3.5; Step 2: The effluent from the contact mixing tank enters the biochemical neutralization tank for biochemical neutralization; Step 3: The mixed liquid effluent from the biochemical neutralization tank enters the sedimentation tank for mud and water separation; Step 4: Part of the qualified wastewater is discharged, and part enters the reflow aeration tank as system effluent to participate in wastewater neutralization; The specific steps of step 4 are: the return flow of effluent to the aeration tank is controlled at 0.85~1·C 酸度 Q HMX废水 ; Among them, C 酸度 is the total acidity of HMX production wastewater, expressed in g NaOH / L; Q HMX废水 Indicates the water inflow of the HMX production wastewater system; an air aerator is installed in the aeration tank to control the DO in the aeration tank ≥ 8 mg / L, strengthen the stripping of acidic metabolites in the effluent, and make the pH value of the return water after aeration greater than 8, thereby improving its ability to dilute and neutralize acidic wastewater; the residence time of the return aeration tank is not less than 30 min; The device for implementing the biochemical neutralization treatment method of high-acidity HMX production wastewater comprises a reflow aeration tank (1), a contact mixing tank (2), a biochemical neutralization tank (3), a sedimentation tank (4), an automatic control cabinet (5), a reflow pump (6), a water distribution plate (8), a guide plate (9), an aeration zone (11), an aerator (12), and a filler zone (14); The device is provided with four units, namely, a reflux aeration tank (1), a contact mixing tank (2), a biochemical neutralization tank (3), and a sedimentation tank (4), which are connected in series by a partition. An aerator (12) is provided at the bottom of the reflux aeration tank (1). A flow hole is provided at the bottom of the partition between the reflux aeration tank (1) and the contact mixing tank (2). An HMX production wastewater inlet is provided at the bottom of the contact mixing tank (2) and is connected to an HMX production wastewater inlet pipeline. A flow hole is provided at the upper part of the partition between the contact mixing tank (2) and the biochemical neutralization tank (3). The biochemical neutralization tank (3) is divided into two areas, namely, a packing area (14) and an aeration area (11). The packing area (14) and the aeration area (11) are provided with a plurality of flow holes. ) are provided between the biochemical neutralization tank (3) and the sedimentation tank (4), and flow holes are provided at the upper and lower parts of the partition; biological fillers are provided in the middle of the filler area (14); an aerator (12) is provided at the lower part of the aeration area (11); a partition is provided between the biochemical neutralization tank (3) and the sedimentation tank (4), and flow holes are provided at the upper and lower parts of the partition; a vertical guide plate (9) is provided on the water inlet side of the sedimentation tank (4), a horizontal downwardly inclined water distribution plate (8) is provided at the lower part of the guide plate (9), and a mud bucket inclined toward the biochemical neutralization tank (3) is provided at the lower part of the sedimentation tank (4); a water outlet is provided above the side wall of the sedimentation tank (4), a return water pipeline branch is provided on the water outlet pipeline connected to the water outlet, and a return water pipeline is provided on the return water pipeline. A return pump (6) is provided.

2. A biochemical neutralization treatment method for high-acidity HMX production wastewater as claimed in claim 1, characterized in that: The specific steps of step 2 are as follows: the effluent from the contact mixing tank enters the biochemical neutralization tank; the flow state of the biochemical neutralization tank is completely mixed to enhance the buffering capacity against the high acidity impact of the wastewater; the acidity load of the biochemical neutralization tank is set to 800-1200 g NaOH / (m 3 ·d), and the retention time is not less than 12 hours; biological fillers are set in the biochemical neutralization tank for the enrichment and growth of acid-resistant and alkali-producing microorganisms; the microorganisms exist in the biochemical neutralization tank in the form of biofilm and activated sludge, and the biomass MLSS in the biochemical neutralization tank is controlled in the range of 7500-15000 mg / L; an aerator is set in the biochemical neutralization tank, and the microbial biological oxidation adopts aerobic oxidation to control the dissolved oxygen DO in the biochemical neutralization tank ≥3 mg / L, so as to accelerate the degradation rate of pollutants and the discharge of acidic metabolites in the system; Simultaneously monitor the pH of the mixed liquor in the biochemical neutralization tank and maintain the pH of the mixed liquor ≥ 6.5; if the pH of the mixed liquor is lower than 6.5, stop the inflow of raw wastewater until the pH of the mixed liquor in the biochemical neutralization tank recovers to above 7.

3. A biochemical neutralization treatment method for high-acidity HMX production wastewater as claimed in claim 2, characterized in that: The biological filler adopts polyethylene spherical suspended filler, which has the characteristics of strong biological attachment ability, good chemical and biological stability, large specific surface area, high porosity, strong hydrophilicity, etc. When the biochemical neutralization tank is working, the filler of the growing microorganisms can be suspended in the water with aeration and stirring in the tank and fluidized evenly in the whole tank, and the filler can cut and disperse bubbles during the fluidization process, so that the gas distribution is uniform and the oxygen utilization rate is improved.

4. A biochemical neutralization treatment method for high-acidity HMX production wastewater as claimed in claim 2, characterized in that: The microorganisms are obtained by domesticating, culturing and enriching the sludge in the aerobic pool of the comprehensive wastewater treatment station of the relevant explosives factory in the biochemical neutralization system; the initial inoculation sludge concentration MLSS of the biological neutralization system is 10000 mg / L, the culture temperature is 20-30°C, and the domestication and cultivation are carried out by gradually increasing the influent load of high-acid HMX wastewater; after 30-60 days of cultivation, the microbial properties, biochemical neutralization efficiency and pollutant removal indicators in the biochemical neutralization system tend to be stable, and the system can achieve continuous and stable operation.

5. The biochemical neutralization treatment method for high-acidity HMX production wastewater according to claim 1, characterized in that: The specific steps of step three are: the mixed liquid effluent in the biochemical neutralization tank enters the sedimentation tank for mud and water separation; the activated sludge is returned to the biochemical neutralization tank after sedimentation to replenish the microbial biomass of the biochemical neutralization tank; the effluent after clarification is partly sent to the subsequent sewage comprehensive treatment facility for treatment or discharged after testing to meet the standards, and partly returned to the effluent return aeration tank.

6. The biochemical neutralization treatment method for high-acidity HMX production wastewater according to claim 1, characterized in that: The side walls of the recirculation aeration tank (1) are alternately provided with transverse guide plates (15) with one end open, which promote the full mixing of bubbles and recirculation water by changing the direction and speed of bubble upflow, thereby improving the stripping efficiency; A DO probe (13) is provided inside the reflow aeration tank (1) and is connected to an automatic control cabinet (5) to control the aeration volume by detecting the dissolved oxygen DO value in the reflow aeration tank (1); The side walls of the contact mixing tank (2) are alternately provided with transverse guide plates (15) with one end open to prevent overcurrent short circuit and promote full mixing of HMX production wastewater and return water; A pH probe (10) is disposed on the upper portion of the contact mixing tank (2) to detect the pH value in the contact mixing tank online, and is connected to a control cabinet to adjust the effluent return flow rate of the effluent return pump control device; A pH probe (10) is provided on the upper part of the aeration zone (11) of the biochemical neutralization tank (3) to synchronously monitor the pH of the mixed liquid in the biochemical neutralization tank and is connected to the automatic control cabinet (5) to ensure that the pH of the mixed liquid is ≥ 6.5; if the pH of the mixed liquid is lower than 6.5, the water inlet pump (16) is turned off to stop the inflow of raw wastewater until the pH of the mixed liquid in the biochemical neutralization tank (3) is restored to above 7.

7. The biochemical neutralization treatment method for high-acidity HMX production wastewater according to claim 1, characterized in that: The HMX production wastewater inlet pipeline is provided with an inlet pump (16) and is connected to an automatic control cabinet (5) to control the inlet flow rate. A DO probe (13) is provided on the upper part of the packing area of ​​the biochemical neutralization tank (3) to detect the dissolved oxygen DO value in the recirculation aeration tank online and is connected to the control cabinet to ensure that the dissolved oxygen DO is ≥ 3 mg / L.

8. The biochemical neutralization treatment method for high-acidity HMX production wastewater according to claim 1, characterized in that: The aerators (12) are all connected to the aeration fan (7). The aerators (12) in the reflux aeration tank (1) are used to aerate and blow off the acidic metabolites contained in the reflux water of the device, thereby increasing the pH value. The aerators (12) in the aeration zone of the biochemical neutralization tank (3) oxygenate the mixed liquid through air aeration, and at the same time blow off the acidic metabolites formed by the biochemical reaction, and provide power for the water flow to rise. The automatic control cabinet (5) is connected to the pH probe (10), the DO probe (13), the reflux pump (6), the water inlet pump (16), and the aeration fan (7) via a control line.

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