CN111252986A - High ammonia nitrogen wastewater treatment system and method - Google Patents
High ammonia nitrogen wastewater treatment system and method Download PDFInfo
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- C02F1/28—Treatment of water, waste water, or sewage by sorption
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Abstract
The invention discloses a high ammonia nitrogen wastewater treatment system and a high ammonia nitrogen wastewater treatment method, wherein the system comprises a flocculation sedimentation tank, a dosing device, a heat exchanger, a filter and a denitrification system, the denitrification system comprises a membrane degassing device and an acid liquor circulation system, the membrane degassing device comprises a shell and a degassing membrane arranged in the shell, a shell pass is formed between the shell and the degassing membrane, a tube pass is formed in the degassing membrane, the outlet end of the filter is connected with the shell pass inlet end of the membrane degassing device through a pipeline, and the tube pass inlet end and the outlet end of the membrane degassing device are connected in series with the acid liquor circulation system. Compared with the prior art, the method has the advantages of small occupied area, high automation degree, stable water quality, no need of adding additional carbon source, lower operation cost and capability of producing high-value ammonium salt by-products.
Description
Technical Field
The invention relates to the technical field of desulfurization activated carbon regeneration wastewater treatment, in particular to a high ammonia nitrogen wastewater treatment system and a method thereof.
Background
With the rapid industrialization pace of China, the atmospheric pollution is also increased correspondingly. One of the main causes of atmospheric pollution is smoke generated from coal burning, and the main components are SO2 and NOx. At present, the flue gas desulfurization and denitrification activated carbon has already finished industrialized tests in several areas of China, and a production line is built in factories in some areas for production.
Firstly, flue gas containing sulfide and nitrogen oxide is dedusted and cooled, then is sent to an adsorption tower by a fan, the gas is heated with ammonia water before entering the adsorption tower to generate ammonia gas for mixing, the reaction is convenient, sulfur dioxide is adsorbed by activated carbon in the adsorption tower, the sulfur dioxide is oxidized into sulfur trioxide under the catalysis of the activated carbon, NOx is converted and decomposed into N2, and the adsorbed gas is discharged from a chimney as tail gas reaching the standard.
And then, the activated carbon in the adsorption tower continuously moves downwards along with the moving bed, the downwards moving speed is determined by the adsorption effect, the adsorption effect is good, the sulfur dioxide content is low, the downwards moving speed is slower, and on the contrary, the adsorption effect is poor, the sulfur dioxide content is high, and the downwards moving speed is faster.
Finally, when the activated carbon moves downwards, regenerated activated carbon or new activated carbon in a storage tank is added from the upper part of the adsorption tower by a lifter to supplement the space left after the activated carbon moves downwards. The activated carbon saturated by adsorption is conveyed to a desorption tower for high-temperature desorption. In the desorption tower, the acid gas such as SO2 is released in a gaseous state; some heavy metals are carried out in a gaseous or dust state together with the desorption gas; in order to improve the desulfurization and denitrification efficiency, more ammonia than the theoretical value is injected in the adsorption process, so that the excessive ammonia is released from the activated carbon in the high-temperature desorption process. Therefore, the desorbed waste gas is enriched with pollutants such as high-concentration SO2, NH4+, heavy metal ions and the like and dust generated by aging and abrasion of the activated carbon.
As the desorption waste gas used for preparing acid contains almost all other harmful impurities in the sintering flue gas besides high-concentration SO2, in order to ensure the purity of an acid liquor product, the waste gas is washed and purified by using a dilute acid liquor before acid preparation, NH4+, metal ions and dust suspended matters in the waste gas are transferred into the dilute acid liquor, and the washed waste acid is the high ammonia nitrogen wastewater to be treated.
Pollutants in the wastewater mainly comprise high-concentration NH3-N, suspended matters and a small amount of heavy metal ions, and the high-ammonia nitrogen wastewater is mainly treated by a stripping and biochemical method at present, but the treatment method has the defects of high operation cost, unstable operation, poor effluent quality index, large floor area and the like because a large amount of carbon sources are required to be added.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high ammonia nitrogen wastewater treatment system and a high ammonia nitrogen wastewater treatment method, which are used for effectively treating high ammonia nitrogen wastewater, have the advantages of small occupied area, high automation degree, stable water quality, no need of adding an additional carbon source, lower operation cost and capability of producing high-value ammonium salt byproducts compared with the prior art.
In one aspect, the invention provides a high ammonia nitrogen wastewater treatment system, comprising:
the flocculation sedimentation tank is used for flocculating and settling the high ammonia-nitrogen wastewater, and an outlet end of the flocculation sedimentation tank is provided with an intermediate tank;
the dosing device comprises a flocculating agent dosing device for adding a flocculating agent into the flocculation sedimentation tank and an alkali liquor dosing device for adding alkali liquor into the flocculation sedimentation tank and the intermediate tank respectively;
the heat exchanger is connected to the outlet end of the intermediate tank through a pipeline and is used for heating the high ammonia nitrogen wastewater flowing out of the intermediate tank;
the filter is connected to the outlet end of the heat exchanger through a pipeline and is used for filtering the high ammonia nitrogen wastewater flowing out of the heat exchanger;
and the denitrification system comprises at least one membrane degassing device and an acid liquor circulating system, the membrane degassing device comprises a shell and a degassing membrane arranged in the shell, a shell pass is formed between the shell and the degassing membrane, a tube pass is formed in the degassing membrane, the outlet end of the filter is connected with the shell pass inlet end of the membrane degassing device through a pipeline, and the tube pass inlet end and the outlet end of the membrane degassing device are connected in series into the acid liquor circulating system.
Further, the bottom of flocculation sedimentation tank is provided with the mud discharge mouth, the below of mud discharge mouth is provided with folds spiral shell hydroextractor, it is used for carrying out dehydration treatment from mud discharge mouth exhaust mud to fold spiral shell hydroextractor.
Further, still include the waste water elevator pump, the waste water elevator pump is established ties between flocculation and precipitation pond and heat exchanger.
Further, the filter comprises a shallow sand filter, an activated carbon filter and a bag filter which are connected in series through a pipeline in sequence.
Further, the acid liquor circulating system comprises an acid liquor circulating tank and a circulating pump, and the acid liquor circulating tank, the circulating pump and the tube side of the membrane degassing device are connected in series through pipelines to form a circulating loop.
Further, the device also comprises an ammonium salt storage tank, wherein the ammonium salt storage tank is connected to a pipeline of the acid liquor circulating system.
Further, the chemical cleaning system is used for introducing chemical cleaning agents into the membrane degassing device so as to clean dirt on the surface of the degassing membrane.
On the other hand, the invention provides a high ammonia nitrogen wastewater treatment method, which comprises the following steps:
s1, allowing the treated high ammonia nitrogen wastewater to enter a flocculation sedimentation tank, adding alkali liquor into the flocculation sedimentation tank, adjusting the pH value of the wastewater to 8 +/-0.5, adding a flocculating agent into the flocculation sedimentation tank, flocculating suspended solids and heavy metal ions in the wastewater under the action of the flocculating agent, and precipitating at the bottom of the flocculation sedimentation tank;
s2, feeding the wastewater obtained in the step S1 into an intermediate tank, and introducing alkali liquor into the intermediate tank again to adjust the pH value of the wastewater to 10 +/-0.5;
s3, the wastewater obtained in the step S2 enters a heat exchanger, and the wastewater is heated to 35-50 ℃;
s4, enabling the wastewater obtained in the step S3 to enter a multistage filter, filtering suspended matter particles in the wastewater, and reducing COD in the wastewater;
s5, the wastewater obtained in the step S4 enters a shell side of a membrane degassing device, the wastewater flows in the shell side, acid liquor is introduced into a tube side of the membrane degassing device, the wastewater flows in the tube side, the flowing directions of the wastewater and the acid liquor are opposite, gaseous NH3 in the wastewater enters the tube side through a degassing membrane in the shell side, and gaseous NH3 is converted into NH4+ again under the influence of a pH value, so that ammonium salt is produced, due to the existence of dissociation balance, NH4+ in the wastewater is continuously converted into NH3 to migrate to the shell side, and the ammonium salt solution and the wastewater with the ammonia nitrogen value reaching the standard are obtained.
Further, in step S1, the sludge settled at the bottom of the flocculation sedimentation tank is further gathered by a mud scraper, a part of the sludge is returned to the reaction zone to participate in flocculation, and the excess sludge is dewatered by a sludge dewatering machine and transported outside.
Further, in step S3, the wastewater is filtered sequentially through a shallow sand filter, an activated carbon filter, and a bag filter.
The invention has the beneficial effects that:
(1) in operation, the wastewater containing ammonia nitrogen flows in the shell side of the membrane degassing device, the acid liquor flows in the tube side of the membrane degassing device, the pH value in the wastewater is increased, ammonium ions NH4+ are changed into free gaseous NH3, at the moment, gaseous NH3 can enter the acid liquor phase of the tube side from the wastewater phase in the shell side through the degassing membrane, and is absorbed by the acid liquor to immediately change into ionic NH4+, and the acid liquor is continuously and circularly absorbed to form high-purity ammonium salt solution which can be used as industrial products for sale, and the ammonia nitrogen concentration of the shell side wastewater is continuously reduced until the ammonia nitrogen concentration reaches the discharge standard. Compared with the traditional system, the membrane degassing device has the following advantages: the great increase gas-liquid contact surface of membrane degasser, the gas-liquid separation route is the shortest, can guarantee the gas-liquid separation effect effectively, membrane degasser provides a confined operational environment, can not bring other pollutants into the system, it has fine assurance to go out water quality of water, the modular design that membrane degasser highly concentrates, high durability and convenient installation, the dilatation of being convenient for, take up an area for 1/10 ~ 1/3 of degasser technology, the area that significantly reduces, in addition, membrane degasser does not need additionally to throw the carbon source, the running cost is lower.
(2) The purpose of throwing alkali liquor into the flocculation sedimentation tank is to enhance the using effect of the flocculating agent, reduce the adding amount of the flocculating agent, play a role in preliminary pH adjustment, and then throw alkali liquor into the intermediate tank again, so that the wastewater reaches the alkaline condition that NH4+ can be converted into gaseous NH3, and the flocculation sedimentation tank has the advantages of small dosage of consumed chemicals, good treatment effect, small occupied area and the like.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of a high ammonia nitrogen wastewater treatment system according to an embodiment of the invention;
FIG. 2 is a flow chart of the treatment of the high ammonia nitrogen wastewater according to the embodiment of the invention.
In the attached drawings, 1 represents a flocculation sedimentation tank; 2 denotes an intermediate tank; 3 denotes a wastewater lift pump; 4 denotes a heat exchanger; 5 denotes a shallow sand filter; 6 represents an activated carbon filter; 7 denotes a bag filter; 8 denotes a membrane degasser; 9 represents an ammonium salt storage tank; 10 denotes a circulation pump; 11 denotes an acid liquid circulation tank; 12, a chemical cleaning system; 13 denotes a stack screw dehydrator; and 14 denotes a drug administration device.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In one aspect, as shown in fig. 1-2, an embodiment of the present invention provides a high ammonia nitrogen wastewater treatment system, which includes a flocculation sedimentation tank 1, a dosing device 14, a heat exchanger 4, a filter, a denitrification system, and a chemical cleaning system 12.
Flocculation and precipitation pond 1 is used for flocculating and settling high ammonia-nitrogen wastewater, the exit end of flocculation and precipitation pond 1 is provided with intermediate tank 2, charge device 14 is including being used for adding the flocculating agent charge device 14 of flocculating agent and being used for adding the alkali lye charge device of alkali lye to flocculation and precipitation pond 1 and intermediate tank 2 respectively to flocculation and precipitation pond 1, every charge device 14 all is equipped with the measuring pump, dissolve the medical kit, the agitator, the batch meter, throw solid medicament in dissolving the medical kit, exit linkage to batch meter after the agitator stirs, carry to the point of adding the medicine through the measuring pump.
High ammonia nitrogen waste water at first takes place the reaction with the flocculating agent at flocculation and precipitation pond 1 front end, and suspended solid and heavy metal ion in the waste water are the floc constantly to increase under the effect of flocculating agent, and the stirring wadding group through the reaction zone collides mutually, forms bigger wadding group and the subassembly subsides at the bottom of flocculation and precipitation pond 1 under the effect of swash plate. Because the pH value of the high ammonia nitrogen wastewater is less than 7 generally, the flocculation effect of the flocculant on suspended solids and heavy metal ions is relatively poor under an acidic condition, and the alkali liquor agent is added for primarily adjusting the pH value so as to enhance the effect of the flocculant and reduce the using amount of the flocculant, generally, the pH value of the wastewater in the flocculation sedimentation tank 1 is adjusted to about 8. Before entering the heat exchanger 4, the high ammonia nitrogen wastewater is adjusted to a pH value of about 10 by adding alkali liquor again, because NH4+ in the water can be converted into gaseous NH3 under an alkaline condition, and the pH value is adjusted to about 10, which is an economic and effective set value.
The bottom of flocculation sedimentation tank 1 is provided with the mud discharge mouth, and the below of mud discharge mouth is provided with folds spiral shell hydroextractor 13, folds spiral shell hydroextractor 13 and is used for carrying out dehydration treatment from mud discharge mouth exhaust mud, and the mud cake after the dehydration transports outward, and the water that deviates from flows back and continues to handle to flocculation sedimentation tank 1, can not cause the secondary pollution of mud like this.
The heat exchanger 4 is connected with the outlet end of the middle tank 2 through a pipeline and is used for heating the high ammonia nitrogen wastewater flowing out of the middle tank 2, NH4+ in the wastewater can be continuously changed into gaseous NH3 due to the temperature of above 35 ℃, and too high temperature (higher than 50 ℃) cannot be borne by subsequent treatment equipment (especially an integrated denitrification system), so that the heat exchanger 4 is adopted to control the temperature of the high ammonia nitrogen wastewater to be 35-50 ℃.
In this embodiment, a wastewater lift pump 3 is connected in series between the intermediate tank 2 and the heat exchanger 4 of the clarifier to provide power for the flow of wastewater.
The filter is connected to the outlet end of the heat exchanger 4 through a pipeline and is used for filtering the high ammonia nitrogen wastewater flowing out of the heat exchanger 4, and preferably, the filter of the embodiment comprises a shallow sand filter 5, an activated carbon filter 6 and a bag filter 7 which are connected in series through a pipeline.
Because the integral denitrification system requires less than or equal to 0.5NTU for turbidity, the shallow sand filter 55 is adopted to further remove suspended matters in the wastewater, the inlet water turbidity is reduced, the shallow sand filter 5 has small floor area, high automation degree and high flow rate, although the treatment effect without a mechanical filter is good, the wastewater turbidity value reaches an ideal value through the primary precipitation treatment, and the shallow sand filter 5 is an economic and effective device. The high ammonia nitrogen wastewater enters an activated carbon filter 6 to reduce COD (chemical oxygen demand) in the wastewater, remove the chroma in the wastewater and reduce the pollution of an integrated denitrification system. The wastewater needs to pass through the bag filter 7 before entering the membrane degassing device 8 to provide final guarantee for the degassing membrane, so that the degassing membrane is protected from being damaged by particles.
The denitrification system comprises at least one membrane degassing device 8 and an acid liquor circulating system, wherein the at least one membrane degassing device 8 means that the membrane degassing device 8 can be provided with 1, 2 or even more. The membrane degassing device 8 comprises a shell and a degassing membrane arranged in the shell, wherein the degassing membrane can be a hollow fiber membrane, a shell pass is formed between the shell and the degassing membrane, a tube pass is formed in the degassing membrane, the outlet end of a filter is connected with the shell pass inlet end of the membrane degassing device 8 through a pipeline, the tube pass inlet end and the outlet end of the membrane degassing device 8 are connected in series into an acid liquor circulating system, the acid liquor circulating system comprises an acid liquor circulating tank 11 and a circulating pump 10, the acid liquor circulating tank 11, the circulating pump 10 and the tube pass of the membrane degassing device 8 are connected in series through the pipeline to form a circulating loop, and an ammonium salt storage tank 9 is connected on the.
In operation, wastewater containing ammonia nitrogen flows on the shell side (outer side of the hollow fiber membrane) of the membrane degassing device 8, acid liquor flows on the tube side (inner side of the hollow fiber membrane) of the membrane degassing device 8, and due to the characteristics of the degassing membrane, gaseous NH3 in the wastewater can penetrate through micropores on the surface of the degassing membrane to enter the acid liquor on the tube side from the wastewater in the shell side, NH3 is converted into NH4+ again under the influence of pH value, so that ammonium salt solution is produced, and ammonium salt solution is obtained due to dissociation equilibrium
In the presence of the ammonium salt, NH4+ in the wastewater is continuously changed into NH3 to migrate to the acid liquor phase, the acid liquor is continuously circulated in the acid liquor circulation tank 11 and the degassing membrane under the action of the circulation pump 10, the concentration of the ammonium salt in the acid liquor is continuously increased, the ammonium salt solution is transferred to the ammonium salt storage tank 9 after reaching a certain concentration, and as only the acid liquor and NH4+ in the acid liquor are formed into very pure ammonium salt which can be directly recycled. By connecting the multi-membrane degassing device 8 in series, the concentration of NH4+ in the wastewater can be further reduced, and the discharge requirement is met.
On the other hand, as shown in fig. 1-2, the embodiment of the invention provides a method for treating high ammonia nitrogen wastewater, comprising the following steps:
s1, enabling the treated high ammonia nitrogen wastewater to enter a flocculation sedimentation tank 1, adding alkali liquor into the flocculation sedimentation tank 1, adjusting the pH value of the wastewater to 8 +/-0.5, simultaneously adding a flocculating agent into the flocculation sedimentation tank 1, flocculating suspended solids and heavy metal ions in the wastewater under the action of the flocculating agent, precipitating at the bottom of the flocculation sedimentation tank 1, further aggregating sludge precipitated at the bottom of the flocculation sedimentation tank 1 through a mud scraper, refluxing a part of sludge to a reaction area to participate in flocculation, and dewatering and transporting excess sludge through a sludge dewatering machine to avoid secondary pollution caused by the sludge;
s2, feeding the wastewater obtained in the step S1 into the intermediate tank 2, and introducing alkali liquor into the intermediate tank 2 again to adjust the pH value of the wastewater to 10 +/-0.5;
s3, the wastewater obtained in the step S2 enters a heat exchanger 4, and the wastewater is heated to 35-50 ℃;
s4, filtering suspended matter particles in the wastewater and reducing COD in the wastewater by the wastewater obtained in the step S3 sequentially through a shallow sand filter 5, an activated carbon filter 6 and a bag filter 7;
s5, the wastewater obtained in the step S3 enters a shell side of a membrane degassing device 8, the wastewater flows in the shell side, acid liquor is introduced into a tube side of the membrane degassing device 8, the wastewater flows in the tube side, the flowing directions of the wastewater and the acid liquor are opposite, gaseous NH3 in the wastewater enters the tube side through a degassing membrane in the shell side, gaseous NH3 is converted into NH4+ again under the influence of the pH value, so that ammonium salt is produced, and due to the existence of dissociation balance, NH4+ in the wastewater is continuously converted into NH3 to migrate to the shell side, so that ammonium salt solution and the wastewater with the ammonia nitrogen value reaching the standard are obtained.
The method is suitable for the field of desulfurization activated carbon regeneration wastewater treatment of flue gas desulfurization and dust removal systems of various factories, can effectively treat high ammonia nitrogen wastewater, and has the characteristics of stable water outlet, small occupied area, good treatment effect, high automation degree, high utilization value of byproducts and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The utility model provides a high ammonia-nitrogen concentration effluent disposal system which characterized in that includes:
the flocculation sedimentation tank is used for flocculating and settling the high ammonia-nitrogen wastewater, and an outlet end of the flocculation sedimentation tank is provided with an intermediate tank;
the dosing device comprises a flocculating agent dosing device for adding a flocculating agent into the flocculation sedimentation tank and an alkali liquor dosing device for adding alkali liquor into the flocculation sedimentation tank and the intermediate tank respectively;
the heat exchanger is connected to the outlet end of the intermediate tank through a pipeline and is used for heating the high ammonia nitrogen wastewater flowing out of the intermediate tank;
the filter is connected to the outlet end of the heat exchanger through a pipeline and is used for filtering the high ammonia nitrogen wastewater flowing out of the heat exchanger;
and the denitrification system comprises at least one membrane degassing device and an acid liquor circulating system, the membrane degassing device comprises a shell and a degassing membrane arranged in the shell, a shell pass is formed between the shell and the degassing membrane, a tube pass is formed in the degassing membrane, the outlet end of the filter is connected with the shell pass inlet end of the membrane degassing device through a pipeline, and the tube pass inlet end and the outlet end of the membrane degassing device are connected in series into the acid liquor circulating system.
2. The high ammonia nitrogen wastewater treatment system according to claim 1, wherein a sludge discharge port is arranged at the bottom of the flocculation sedimentation tank, a screw overlapping dehydrator is arranged below the sludge discharge port, and the screw overlapping dehydrator is used for dehydrating sludge discharged from the sludge discharge port.
3. The high ammonia-nitrogen wastewater treatment system according to claim 1, further comprising a wastewater lift pump, wherein the wastewater lift pump is connected in series between the flocculation sedimentation tank and the heat exchanger.
4. The high ammonia-nitrogen wastewater treatment system of claim 1, wherein the filter comprises a shallow sand filter, an activated carbon filter and a bag filter which are connected in series through a pipeline.
5. The high ammonia-nitrogen wastewater treatment system as recited in claim 1, wherein the acid liquor circulation system comprises an acid liquor circulation tank and a circulation pump, and the acid liquor circulation tank, the circulation pump and the tube pass of the membrane degasser are connected in series through pipelines to form a circulation loop.
6. The high ammonia-nitrogen wastewater treatment system of claim 5, further comprising an ammonium salt storage tank connected to the pipeline of the acid liquor circulation system.
7. The high ammonia nitrogen wastewater treatment system of claim 1, further comprising a chemical cleaning system, wherein the chemical cleaning system is used for introducing chemical cleaning agents into the membrane degassing device to clean dirt on the surface of the degassing membrane.
8. A high ammonia nitrogen wastewater treatment method is characterized by comprising the following steps:
s1, allowing the treated high ammonia nitrogen wastewater to enter a flocculation sedimentation tank, adding alkali liquor into the flocculation sedimentation tank, adjusting the pH value of the wastewater to 8 +/-0.5, adding a flocculating agent into the flocculation sedimentation tank, flocculating suspended solids and heavy metal ions in the wastewater under the action of the flocculating agent, and precipitating at the bottom of the flocculation sedimentation tank;
s2, feeding the wastewater obtained in the step S1 into an intermediate tank, and introducing alkali liquor into the intermediate tank again to adjust the pH value of the wastewater to 10 +/-0.5;
s3, the wastewater obtained in the step S2 enters a heat exchanger, and the wastewater is heated to 35-50 ℃;
s4, enabling the wastewater obtained in the step S3 to enter a multistage filter, filtering suspended matter particles in the wastewater, and reducing COD in the wastewater;
s5, the wastewater obtained in the step S4 enters a shell side of a membrane degassing device, the wastewater flows in the shell side, acid liquor is introduced into a tube side of the membrane degassing device, the wastewater flows in the tube side, the flowing directions of the wastewater and the acid liquor are opposite, gaseous NH3 in the wastewater enters the tube side through a degassing membrane in the shell side, and gaseous NH3 is converted into NH4+ again under the influence of a pH value, so that ammonium salt is produced, due to the existence of dissociation balance, NH4+ in the wastewater is continuously converted into NH3 to migrate to the shell side, and the ammonium salt solution and the wastewater with the ammonia nitrogen value reaching the standard are obtained.
9. The method for treating high ammonia nitrogen wastewater according to claim 8, wherein in step S1, the sludge settled at the bottom of the flocculation sedimentation tank is further gathered by a mud scraper, a part of the sludge is returned to the reaction zone to participate in flocculation, and the excess sludge is dewatered by a sludge dewatering machine and transported out.
10. The method for treating high ammonia nitrogen wastewater according to claim 8, wherein in step S3, wastewater is filtered through a shallow sand filter, an activated carbon filter and a bag filter in sequence.
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