An emergency treatment method and system with nitrogen and phosphorus recovery

Abstract

The present invention discloses an emergency treatment method and system with nitrogen and phosphorus recovery. The method comprises the following steps: S1. The polluted water body passes through filtration and ozone treatment in sequence, which are respectively used to remove SS and COD in the water body; S2. The water body then passes through an ammonia nitrogen adsorbent and a phosphate adsorbent in sequence for purification, and under the ion exchange effect, NH4-N and phosphate in the water body are removed, and the treated water body is discharged; S3. A magnesium ion-containing solution is added to the regeneration liquid containing high-concentration NH4 + and PO4 3‑ formed after being treated by the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 to form magnesium ammonium phosphate precipitate, i.e., struvite, for nitrogen and phosphorus recovery. The beneficial technical effects of this solution are as follows: good pollutant removal effect, long adsorbent regeneration cycle. This method and system can effectively adsorb nitrogen and phosphorus in the water body, and can absorb and recycle the adsorbed nitrogen and phosphorus.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and particularly to an emergency treatment method and system with nitrogen and phosphorus recovery. Background Art

[0002] With the development of the economy, the urbanization speed in China has been gradually accelerating, and the living standards of the people have been gradually improving. At the same time, the disorderly discharge of domestic sewage has brought a series of water environment problems, such as eutrophication of water bodies, black and odorous water bodies, etc., which seriously affect the lives of surrounding residents and are a major obstacle to the construction of a harmonious and livable living environment. Organic matter, nitrogen, and phosphorus are the main factors leading to eutrophication of water bodies and black and odorous water bodies. The transfer of nutrients such as nitrogen and phosphorus from water bodies to sludge in sewage treatment is likely to cause secondary pollution. If nitrogen and phosphorus can be recovered while treating sewage, it can not only effectively improve the water environment, but also recover nitrogen and phosphorus, create certain economic benefits, and avoid secondary pollution generated during the transfer of nitrogen and phosphorus. Therefore, the development of technologies that can quickly treat polluted water bodies, improve the current situation of the water environment and achieve nitrogen and phosphorus recovery is of great significance to the ecological civilization construction, new urbanization construction and economic development in China. Summary of the Invention

[0003] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an emergency treatment method and system with nitrogen and phosphorus recovery, which can effectively adsorb nitrogen and phosphorus in water bodies and can absorb and recycle the adsorbed nitrogen and phosphorus.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An emergency treatment method with nitrogen and phosphorus recovery includes the following steps:

[0006] S1. The polluted water body passes through filtration and ozone treatment in sequence, which are respectively used to remove SS and COD in the water body; S2. The water body then passes through an ammonia nitrogen adsorbent and a phosphate adsorbent in sequence for purification, and under the ion exchange effect, NH 4 -N and phosphate in the water body are removed, and the treated water body is discharged; S3. A magnesium ion-containing solution is added to the regenerated liquid containing high-concentration NH 4 + and PO 4 3- formed after treatment with the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 to form magnesium ammonium phosphate precipitate, i.e., struvite, for nitrogen and phosphorus recovery.

[0007] Further, a neutral supernatant is formed after the reaction in step S3, and the neutral supernatant is re-mixed with the polluted water body entering step S1 for cyclic treatment.

[0008] Further, when the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 reach the saturation state, the adsorbent regeneration is carried out. An alkaline supernatant is formed after the reaction in step S3. When the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 reach the saturation state, the alkaline supernatant re-enters the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 for adsorbent regeneration.

[0009] Meanwhile, the present invention also provides an emergency treatment system with nitrogen and phosphorus recovery. The emergency treatment system includes an ozone reaction zone, an adsorption zone, and a struvite recovery zone;

[0010] The ozone reaction zone includes a water inlet system, an ozone reaction system, and an ozone generation system. The water inlet system is connected to the ozone reaction system, and the ozone generation system is connected to the ozone reaction system to provide ozone to the ozone reaction system;

[0011] The adsorption zone includes an ammonia nitrogen adsorption system and a phosphate adsorption system. The inlet end of the ammonia nitrogen adsorption system is connected to the outlet end of the ozone reaction system, and the outlet end of the ammonia nitrogen adsorption system is connected to the inlet end of the phosphate adsorption system;

[0012] The struvite recovery zone includes a precipitation reaction system, a MgCl 2 drug addition system, and a PLC control system. The MgCl 2 drug addition system is connected to the precipitation reaction system to provide MgCl 2 solution to it. The ammonia nitrogen adsorption system and the phosphate adsorption system are respectively connected to the precipitation reaction system to respectively provide the regeneration waste liquid containing NH 4 + and PO 4 3- ions to it.

[0013] Further, the precipitation reaction system is also connected to the ozone reaction system through a pipeline provided to remix the neutral supernatant in it with the polluted water body entering the ozone reaction system.

[0014] Further, the precipitation reaction system is also connected to the ammonia nitrogen adsorption system and the phosphate adsorption system through pipelines respectively provided to re-enter the alkaline supernatant in it into the ammonia nitrogen adsorbent and the phosphate adsorbent for adsorbent regeneration.

[0015] Further, the water inlet system includes a grille, a water inlet pipe, and a lift pump. The grille is arranged at the inlet of the water inlet pipe, the lift pump is installed on the water inlet pipe, and the outlet end of the water inlet pipe is connected to the ozone reactor.

[0016] Further, the ozone reaction system includes a filter tank and an ozone reactor. A filter packing material for filtering SS in the water body is arranged in the filter tank, and the filter tank is connected to the bottom end of the ozone reactor through a pipeline.

[0017] Further, the ozone generation system includes a filter, an air dry compressor, a filter, an ozone generator, and a gas flowmeter connected in sequence through pipelines. The ozone generation system is connected to the bottom end of the ozone reactor.

[0018] Further, the ammonia nitrogen adsorption system includes an ammonia nitrogen adsorption tank and an ammonia nitrogen adsorbent regeneration liquid storage tank. The ammonia nitrogen adsorption tank is connected to the ammonia nitrogen adsorbent regeneration liquid storage tank. An ammonia nitrogen adsorbent regeneration liquid for regenerating the ammonia nitrogen adsorbent is contained in the ammonia nitrogen adsorbent regeneration liquid storage tank.

[0019] Further, the phosphate adsorption system includes a phosphate adsorption tank and a phosphate adsorbent regeneration liquid storage tank. The phosphate adsorption tank is connected to the phosphate adsorbent regeneration liquid storage tank. A phosphate adsorbent regeneration liquid for regenerating the phosphate adsorbent is contained in the phosphate adsorbent regeneration liquid storage tank. The phosphate adsorption tank is connected to the ammonia nitrogen adsorption tank.

[0020] Further, the precipitation reaction system includes a reactor, a stirrer, a stainless steel crystallization mesh, and a sediment discharge valve. The stirrer is arranged in the reactor, the sediment discharge valve is arranged at the bottom end of the reactor, the stainless steel crystallization mesh is arranged at the bottom end of the inner cavity of the reactor, and the reactor is connected to the phosphate adsorbent regeneration liquid storage tank and the ammonia nitrogen adsorbent regeneration liquid storage tank through pipelines respectively.

[0021] Further, the MgCl 2 The chemical dosing system includes a MgCl 2 drug storage tank and a chemical dosing metering pump. The MgCl 2 drug storage tank is connected to the reactor through the chemical dosing metering pump.

[0022] Further, the reactor is made of carbon steel belonging to anti-corrosion materials.

[0023] Compared with the prior art, the beneficial technical effects of this solution are as follows: good pollutant removal effect and long adsorbent regeneration cycle. This technology adopts a process combining ozone and ion adsorption. After the polluted water body is filtered and ozone-oxidized, COD and SS in the water body can be effectively removed, and the regeneration cycle of the ion adsorbent can be extended. The ammonia nitrogen adsorbent and phosphate adsorbent can effectively remove ammonia nitrogen and phosphate in the water body. After treatment, the organic matter, chromaticity, suspended solids, ammonia nitrogen, and phosphate in the water body are significantly reduced, which can effectively improve the current situation of the polluted water body, and the effluent is stable.

[0024] Recycling and resource utilization of nitrogen and phosphorus: The waste liquid after the regeneration of the ammonia nitrogen and phosphate adsorbents contains high concentrations of NH 4 + and PO 4 3- ions. By adding MgCl 2 solution to the regenerated waste liquid mixture, magnesium ammonium phosphate precipitate with relatively high purity can be generated, commonly known as struvite. Struvite is a high-quality slow-release fertilizer with strong fertilizer efficiency and can be used for agricultural fertilization, generating certain economic benefits.

[0025] No special treatment is required for the adsorbent regeneration liquid: By controlling the addition amounts of the NH 4 -N adsorbent regeneration solution and the phosphate adsorbent regeneration solution, the regenerated liquid mixture is neutral or strongly alkaline after mixing. The neutral supernatant after the reaction re-enters the system and is mixed with the influent for further treatment, or the strongly alkaline supernatant enters the regeneration system for adsorbent regeneration, without the need for special treatment.

[0026] Zero discharge of the adsorbent regeneration waste liquid: After the NH 4 -N adsorbent regeneration waste liquid and the phosphate adsorbent regeneration waste liquid are mixed, MgCl 2 solution is added, and NH 4 + 、PO 4 3- and Mg 2+ generate struvite, and the supernatant enters the filter tank and is mixed with the influent for further treatment or used for adsorbent regeneration, achieving zero discharge of the regeneration waste liquid.

[0027] Relatively simple maintenance: In this technology, the ozone reaction system, adsorption equipment, and recovery equipment all adopt modular design. The equipment structure is relatively simple, easy to install, operate, and maintain.

[0028] Small floor area and convenient installation: In this technology, the ozone reaction system, adsorption equipment, and recovery equipment all adopt modular design. Therefore, the floor area is effectively reduced, and the installation method can be adjusted according to the site conditions, and it can be well applied to areas with limited construction space such as river channels. Description of the Drawings

[0029] Figure 1 Schematic flow chart of the emergency treatment method with nitrogen and phosphorus recovery in the present invention.

[0030] Figure 2 Schematic structural diagram of the first embodiment of the emergency treatment system with nitrogen and phosphorus recovery in the present invention.

[0031] Figure 3 Schematic structural diagram of the second embodiment of the emergency treatment system with nitrogen and phosphorus recovery in the present invention.

[0032] Figure 4 Schematic structural diagram of the adsorption zone in the present invention.

[0033] In the figure:

[0034] 1 - influent system, 1 - 1 - grille, 1 - 2 - influent pipe, 1 - 3 - lift pump, 2 - ozone reaction system, 2 - 1 - filter tank, 2 - 2 - ozone reactor, 3 - ozone generation system, 3 - 1 - filter, 3 - 2 - air compression dryer, 3 - 3 - filter, 3 - 4 - ozone generator, 3 - 5 - gas flowmeter, 4 - ammonia nitrogen adsorption system, 4 - 1 - ammonia nitrogen adsorption tank, 4 - 2 - main control valve of ammonia nitrogen adsorption tank, 4 - 3 - regeneration liquid storage tank of ammonia nitrogen adsorbent, 4 - 4 - influent valve, 4 - 5 - effluent valve, 4 - 6 - manual ball valve, 4 - 7 - waste liquid discharge valve, 5 - phosphate adsorption system, 5 - 1 - phosphate adsorption tank, 5 - 2 - main control valve of phosphate adsorption tank, 5 - 3 - regeneration liquid storage tank of phosphate adsorbent, 5 - 4 - influent valve, 5 - 5 - manual ball valve, 5 - 6 - effluent valve, 5 - 7 - waste liquid discharge valve, 6 - precipitation reaction system, 6 - 1 - reactor, 6 - 2 - agitator, 6 - 3 - stainless steel crystallization mesh, 6 - 4 - precipitation discharge valve, 6 - 5 - circulation pump, 7 - MgCl 2 Dosing system, 7 - 1 - dosing metering pump, 7 - 2 - MgCl 2 Drug storage tank, 8 - PLC temperature control system. Detailed implementation manners

[0035] The present invention will be further described in detail below in conjunction with the specification drawings and specific implementation manners.

[0036] This solution aims at the defects of low ammonia nitrogen removal efficiency in the existing sewage water emergency technologies and equipment and the inability to recover nitrogen and phosphorus, and further proposes an emergency treatment method and system with nitrogen and phosphorus recovery. This method and system can effectively adsorb nitrogen and phosphorus in the water body and can absorb and recycle the adsorbed nitrogen and phosphorus.

[0037] Refer to the attached Figure 1 As shown, it is a schematic flow chart of the emergency treatment method with nitrogen and phosphorus recovery in this embodiment. The emergency treatment method with nitrogen and phosphorus recovery in this embodiment includes the following steps:

[0038] S1. The polluted water body passes through filtration and ozone treatment in sequence, which are respectively used to remove SS and COD in the water body;

[0039] S2. The water body then passes through an ammonia nitrogen adsorbent and a phosphate adsorbent in sequence for purification, and under the ion exchange action, NH 4 -N and phosphates in the water body are removed, and the treated water body is discharged;

[0040] S3. In the regeneration liquid containing high concentrations of NH 4 + and PO 4 3- formed after treatment with the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2, a magnesium ion-containing solution is added to form magnesium ammonium phosphate precipitate, namely struvite, for nitrogen and phosphorus recovery.

[0041] At the same time, in order to achieve zero discharge of the adsorbent regeneration waste liquid in this embodiment without special treatment, the supernatant formed after the reaction in step S3 in this solution is neutral, and this neutral supernatant is mixed with the polluted water body entering step S1 again for cyclic treatment; in addition, as needed, that is, when the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 reach the saturation state, the adsorbent is regenerated, and the alkaline supernatant formed after the reaction in step S3 enters the ammonia nitrogen adsorbent and the phosphate adsorbent in step S2 again for adsorbent regeneration.

[0042] Example 1:

[0043] Refer to the attached Figure 2 and 4 As shown, the present invention also provides an emergency treatment system with nitrogen and phosphorus recovery. The emergency treatment system includes an ozone reaction zone, an adsorption zone, and a struvite recovery zone. The ozone reaction zone includes a water inlet system 1, an ozone reaction system 2, and an ozone generation system 3. Among them, the water inlet system 1 is connected to the ozone reaction system 2, and the ozone generation system 3 is connected to the ozone reaction system 2 to provide ozone to the ozone reaction system 2;

[0044] The adsorption zone includes an ammonia nitrogen adsorption system 4 and a phosphate adsorption system 5. Among them, the inlet end of the ammonia nitrogen adsorption system 4 is connected to the outlet end of the ozone reaction system 2, and the outlet end of the ammonia nitrogen adsorption system 4 is connected to the inlet end of the phosphate adsorption system 5;

[0045] The struvite recovery zone includes a precipitation reaction system 6, a MgCl 2 drug addition system 7, and a PLC control system 8. Among them, the MgCl 2 drug addition system 7 is connected to the precipitation reaction system 6 to provide MgCl 2Solution, the ammonia nitrogen adsorption system 4 and the phosphate adsorption system 5 are respectively connected to the precipitation reaction system 6 and are respectively used to provide the regeneration waste liquid containing NH 4 + and PO 4 3- ions to it.

[0046] Specifically, the influent water system 1 includes a grille 1-1, an influent water pipe 1-2 and a lift pump 1-3. The grille 1-1 is arranged at the inlet of the influent water pipe 1-2 to prevent impurities in the polluted water body from entering. The lift pump 1-3 is installed on the influent water pipe 1-2, and the outlet end of the influent water pipe 1-2 is connected to the ozone reactor 2-2. The ozone reaction system 2 includes a filter tank 2-1 and an ozone reactor 2-2. The filter tank 2-1 is provided with filter packing materials for filtering SS in the water body, and the filter tank 2-1 is connected to the bottom end of the ozone reactor 2-2 through a pipe.

[0047] The ozone generation system 3 includes a filter 3-1, an air compression dryer 3-2, a filter 3-3, an ozone generator 3-4 and a gas flow meter 3-5 connected in sequence through pipes. The ozone generation system 3 is connected to the bottom end of the ozone reactor 2-2 and is used to provide ozone to the ozone reactor 2-2.

[0048] The ammonia nitrogen adsorption system 4 includes an ammonia nitrogen adsorption tank 4-1 and an ammonia nitrogen adsorbent regeneration liquid storage tank 4-3. The ammonia nitrogen adsorption tank 4-1 is connected to the ammonia nitrogen adsorbent regeneration liquid storage tank 4-3. The ammonia nitrogen adsorbent regeneration liquid storage tank 4-3 is filled with ammonia nitrogen adsorbent regeneration liquid for regenerating the ammonia nitrogen adsorbent. The ammonia nitrogen adsorption tank 4-1 is connected to the water outlet of the ozone reactor 2-2 through a pipe. An inlet valve 4-4 is arranged on the pipe connecting the ammonia nitrogen adsorption tank 4-1 and the ozone reactor 2-2. A main control valve 4-2 of the ammonia nitrogen adsorption tank is installed at the inlet of the ammonia nitrogen adsorption tank 4-1. A waste liquid discharge valve 4-7 is arranged between the pipe connecting the ammonia nitrogen adsorption tank 4-1 and the precipitation reaction system 6. At the same time, a manual ball valve 4-6 is arranged on the ammonia nitrogen adsorbent regeneration liquid storage tank 4-3; the phosphate adsorption system is provided with a phosphate adsorption tank 5-1, a main control valve for phosphate adsorption, a phosphate adsorbent regeneration liquid storage tank 5-3, an inlet valve 5-4, a manual ball valve 5-5, an outlet valve 5-6 and a waste liquid discharge valve 5-7. The phosphate adsorbent regeneration liquid storage tank 5-3 is connected to the phosphate adsorption tank 5-1.

[0049] The precipitation reaction system 6 in this embodiment includes a reactor 6-1, a stirrer 6-2, a stainless steel crystallization mesh 6-3, and a sediment discharge valve 6-4. The stirrer 6-2 is arranged inside the reactor 6-1, the sediment discharge valve 6-4 is arranged at the bottom end of the reactor 6-1, and the stainless steel crystallization mesh 6-3 is arranged at the bottom end inside the cavity of the reactor 6-1. The reactor 6-1 is connected to the acid salt adsorbent regeneration liquid storage tank and the ammonia nitrogen adsorbent regeneration liquid storage tank 4-3 through pipelines, and is used for the regeneration waste liquid in the acid salt adsorbent regeneration liquid storage tank and the ammonia nitrogen adsorbent regeneration liquid storage tank 4-3 to enter the reactor 6-1 for adsorbent regeneration.

[0050] In order to enable the recovery of nitrogen and phosphorus, it is necessary to add MgCl 4 + to the above-mentioned regeneration waste liquid containing NH 4 3- and PO 2 ions. The MgCl 2 dosing system 7 in this embodiment includes a MgCl 2 drug storage tank and a dosing metering pump 7-1. The MgCl 2 drug storage tank 7-2 is connected to the reactor 6-1 through the dosing metering pump 7-1. Preferably, the above-mentioned reactor 6-1 in this embodiment is made of carbon steel with anti-corrosion materials.

[0051] In addition, in order to achieve zero discharge of the adsorbent regeneration waste liquid without special treatment, in this solution, after the polluted water body is treated by the adsorbent, the neutral supernatant formed after the reaction can achieve zero discharge, that is, the neutral supernatant is mixed with the incoming polluted water body again for circular treatment. The reactor 6-1 in this embodiment is also connected to the filter tank 2-1 in the ozone reaction system 2 through a pipeline, and a circulation pump 6-5 is installed on the pipeline for sending the neutral supernatant above the inside of the reactor 6-1 during the reaction into the ozone reaction system 2 for circular treatment to achieve the purpose of zero discharge of the regeneration waste liquid.

[0052] During operation, first, before the equipment runs, it should be ensured that the manual ball valves 4-5 on the ammonia nitrogen adsorbent regeneration liquid tank in the adsorption area, the manual ball valves 5-5 on the phosphate adsorbent regeneration liquid tank, the waste liquid discharge valves 5-7 on the hydrochloric acid adsorption tank, and the waste liquid discharge valves 5-7 on the phosphate adsorption tank 5-1 are all in the closed state, and the water circuits of other equipment are unobstructed. Start the inlet lift pump, and the polluted water body enters the filter tank through the lift pump, and then enters the ozone reactor 2-2. Then start the ozone generation system 3, turn on the air compression dryer 3-2 and the ozone generator 3-4 in sequence, and adjust the intake flowmeter of the ozone reactor 2-2; the water discharged from the ozone reactor 2-2 enters the ammonia nitrogen adsorption tank 4-1, and the water discharged from the ammonia nitrogen adsorption tank 4-1 enters the phosphate adsorption tank 5-1, and the water is discharged through the phosphate storage tank to complete the purification of the water body.

[0053] Example Two:

[0054] See the attached Figure 3 As shown, the difference between this Example Two and Example One is only that in this Example Two, the precipitation reaction system 6 is also connected to the ammonia nitrogen adsorption system 4 and the phosphate adsorption system 5 through respectively provided pipelines, for reintroducing the alkaline clear liquid therein into the ammonia nitrogen adsorbent and the phosphate adsorbent for adsorbent regeneration.

[0055] During operation, first, before the equipment runs, it should be ensured that the manual ball valves on the ammonia nitrogen adsorbent regeneration liquid tank in the adsorption area, the manual ball valves on the phosphate adsorbent regeneration liquid tank, the waste liquid discharge valves 5-7 on the hydrochloric acid adsorption tank, and the waste liquid discharge valves 5-7 on the phosphate adsorption tank 5-1 are all in the closed state, and the water circuits of other equipment are unobstructed. Then, start the water inlet lift pump, and the polluted water body enters the filter tank through the lift pump, and then enters the ozone reactor 2-2. Then, start the ozone generation system 3, turn on the air compression dryer and the ozone generator 3-4 in sequence, and adjust the intake flowmeter of the ozone reactor 2-2; the water discharged from the ozone reactor 2-2 enters the ammonia nitrogen adsorption tank 4-1, and the water discharged from the ammonia nitrogen adsorption tank 4-1 enters the phosphate adsorption tank 5-1, and the water is discharged after passing through the phosphate storage tank, completing the purification of the water body;

[0056] When it is detected that the nitrogen and phosphorus contents in the system effluent exceed the standard, the adsorbent is cleaned. First, stop the equipment operation, close the inlet valve connecting the ozone reactor and the ammonia nitrogen adsorption area, close the effluent valve, close the valve of the connecting pipe between the ammonia nitrogen adsorption tank and the phosphate adsorption tank, open the manual ball valves of the ammonia nitrogen adsorbent regeneration liquid inlet pipe and the drain pipe, open the manual ball valves of the phosphate adsorbent regeneration liquid inlet pipe and the drain pipe, and adjust the ammonia nitrogen adsorption main control valve and the phosphate adsorption main control valve to the backwashing state for cleaning. The NH 4 -N adsorbent regeneration liquid and the phosphate adsorbent regeneration liquid are discharged into the main reactor of the struvite recovery area. The regenerated waste liquid contains a high concentration of NH 4 + and PO 4 3- , open the MgCl 2 dosing metering pump to add MgCl 2 solution to the mixed liquid, and stir to fully mix. Mg 2+ , NH 4+ and PO 4 3-The reaction finally forms magnesium ammonium phosphate precipitate, i.e., struvite, which can be recovered as high-quality slow-release fertilizer. By controlling the dosages of the ammonia nitrogen adsorbent regeneration liquid and the phosphate adsorbent regeneration liquid, the pH of the struvite recovery pool is controlled within the range of 7-10. The water temperature of the struvite recovery pool is maintained at 25-30 °C through the PLC temperature control system. Under the conditions of pH 7-10 and temperature 25-30 °C, struvite has a relatively high formation rate. When the supernatant in the struvite recovery area is neutral, the supernatant enters the filter pool and is mixed with the influent for re-treatment; when the supernatant in the struvite recovery area is strongly alkaline, the supernatant enters the adsorption area regeneration system for adsorbent regeneration.

[0057] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An emergency treatment method with nitrogen and phosphorus recovery, characterized in that, it includes the following steps: S1. The polluted water body passes through filtration and ozone treatment in sequence, which are respectively used to remove SS and COD in the water body; S2. Subsequently, the water body passes through an ammonia nitrogen adsorbent and a phosphate adsorbent in sequence for purification, and under the ion exchange effect, NH 4 -N and phosphates in the water body are removed, and the treated water body is discharged; S3. Add a magnesium ion-containing solution to the regenerated liquid containing high concentrations of NH 4 + and PO 4 3- formed after treatment with the ammonia nitrogen adsorbent and phosphate adsorbent in step S2 to form magnesium ammonium phosphate precipitate, i.e., struvite, for nitrogen and phosphorus recovery; By controlling the addition amounts of the NH 4 -N adsorbent regeneration solution and the phosphate adsorbent regeneration solution, the regenerated liquid is neutral or strongly alkaline after mixing; After the reaction in step S3, a neutral supernatant is formed, and the neutral supernatant is remixed with the polluted water body entering step S1 for cyclic treatment; When the ammonia nitrogen adsorbent and phosphate adsorbent in step S2 reach the saturated state, an alkaline supernatant is formed after the reaction in step S3, and the alkaline supernatant re-enters the ammonia nitrogen adsorbent and phosphate adsorbent in step S2 for adsorbent regeneration.

2. An emergency treatment system with nitrogen and phosphorus recovery, characterized in that: The emergency treatment system includes an ozone reaction area, an adsorption area and a struvite recovery area; The ozone reaction area includes a water inlet system, an ozone reaction system and an ozone generation system, wherein the water inlet system is connected to the ozone reaction system, and the ozone generation system is connected to the ozone reaction system for providing ozone to the ozone reaction system; The adsorption area includes an ammonia nitrogen adsorption system and a phosphate adsorption system. The inlet end of the ammonia nitrogen adsorption system is connected to the outlet end of the ozone reaction system, and the outlet end of the ammonia nitrogen adsorption system is connected to the inlet end of the phosphate adsorption system; the ammonia nitrogen adsorption system includes an ammonia nitrogen adsorption tank and an ammonia nitrogen adsorbent regeneration liquid storage tank, and the ammonia nitrogen adsorption tank is connected to the ammonia nitrogen adsorbent regeneration liquid storage tank, wherein the ammonia nitrogen adsorbent regeneration liquid storage tank is filled with ammonia nitrogen adsorbent regeneration liquid for regenerating the ammonia nitrogen adsorbent; the phosphate adsorption system includes a phosphate adsorption tank and a phosphate adsorbent regeneration liquid storage tank, and the phosphate adsorption tank is connected to the phosphate adsorbent regeneration liquid storage tank, wherein the phosphate adsorbent regeneration liquid storage tank is filled with phosphate adsorbent regeneration liquid for regenerating the phosphate adsorbent, and the phosphate adsorption tank is connected to the ammonia nitrogen adsorption tank; The struvite recovery area includes a precipitation reaction system, a MgCl 2 drug addition system and a PLC control system. Among them, the MgCl 2 drug addition system is connected to the precipitation reaction system and is used to provide MgCl 2 solution thereto. The ammonia nitrogen adsorption system and the phosphate adsorption system are respectively connected to the precipitation reaction system and are respectively used to provide the regeneration waste liquid containing NH 4 + and PO 4 3- ions thereto; The precipitation reaction system includes a reactor, a stirrer, a stainless steel crystallization mesh and a precipitation discharge valve. The stirrer is arranged in the reactor, the precipitation discharge valve is arranged at the bottom end of the reactor, and the stainless steel crystallization mesh is arranged at the bottom end of the inner cavity of the reactor; The reactor is connected to the ozone reaction system through a pipeline for remixing the neutral supernatant therein with the polluted water body entering the ozone reaction system for treatment; The reactor is respectively connected to the acid salt adsorbent regeneration liquid storage tank and the ammonia nitrogen adsorbent regeneration liquid storage tank through pipelines, and is used to re-introduce the alkaline supernatant liquid therein into the ammonia nitrogen adsorbent and the phosphate adsorbent for adsorbent regeneration; NH 4 -N The dosages of the adsorbent regeneration liquid and the phosphate adsorbent regeneration liquid can be controlled.

3. According to an emergency treatment system with nitrogen and phosphorus recovery as claimed in claim 2, characterized in that: The water inlet system includes a grille, a water inlet pipeline and a lift pump. The grille is arranged at the inlet of the water inlet pipeline, the lift pump is installed on the water inlet pipeline, and the outlet end of the water inlet pipeline is connected to the ozone reaction system.

4. According to an emergency treatment system with nitrogen and phosphorus recovery as claimed in claim 3, characterized in that: The ozone reaction system includes a filtration tank and an ozone reactor, wherein a filtration packing material for filtering SS in water is arranged in the filtration tank, and the filtration tank is communicated with the bottom end of the ozone reactor through a pipeline.

5. An emergency treatment system with nitrogen and phosphorus recovery according to claim 4, characterized in that: The ozone generation system includes a filter, an air compression dryer, a filter, an ozone generator and a gas flow meter connected in sequence through pipelines, wherein the ozone generation system is connected to the bottom end of the ozone reactor.

6. An emergency treatment system with nitrogen and phosphorus recovery according to claim 2, characterized in that: The MgCl 2 The chemical dosing system includes MgCl 2 a chemical storage tank and a chemical dosing metering pump, wherein the MgCl 2 chemical storage tank is connected to the reactor through the chemical dosing metering pump.

7. An emergency treatment system with nitrogen and phosphorus recovery according to claim 2, characterized in that: The reactor is made of carbon steel which belongs to an anti-corrosion material.

Images