CN114620823A - Water treatment system using ammonium catalyst - Google Patents
Water treatment system using ammonium catalyst Download PDFInfo
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- CN114620823A CN114620823A CN202210283186.0A CN202210283186A CN114620823A CN 114620823 A CN114620823 A CN 114620823A CN 202210283186 A CN202210283186 A CN 202210283186A CN 114620823 A CN114620823 A CN 114620823A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/94—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides of the iron group metals or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/485—Impregnating or reimpregnating with, or deposition of metal compounds or catalytically active elements
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention provides a water treatment system applying an ammonium catalyst, which comprises a water inlet pool, a catalytic reaction pool, a water production pool and a regenerated liquid storage tank, wherein the catalytic reaction pool is internally loaded with the ammonium catalyst, and the regenerated liquid storage tank is filled with NaClO solution. Aiming at the defect that the conventional ammonium catalyst cannot continuously and stably produce the nitrite nitrogen in the process of the deammoniation reaction, the NaClO aqueous solution is adopted to treat the ammonium catalyst, so that the ammonium catalyst can be restored to the state capable of stably producing the nitrite nitrogen, and the service life of the ammonium catalyst is prolonged. The preparation method of the ammonium catalyst has the advantages of simple steps, mild conditions, high synthesis efficiency, low raw material cost, obvious economic benefit, high ammonium removal efficiency of the obtained catalyst and long service life. The invention combines the deammoniation technology and the anaerobic ammonium oxidation technology, realizes the deep denitrification of the municipal sewage without adding a carbon source, improves the quality of produced water and reduces the resource cost of the sewage.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of water treatment, in particular to a water treatment system for low-ammonia nitrogen concentration wastewater.
[ background of the invention ]
Ammonia nitrogen, especially BOD, in water5The removal of ammonia nitrogen in sewage with lower carbon-nitrogen ratio and total nitrogen of less than 4 is always a hotspot and a difficulty of research in the field of drinking water. In the technical field of ammonia nitrogen treatment of municipal water, the currently adopted methods comprise a biological method and an ion exchange method. However, the operation of the biological method is unstable, the fluctuation of produced water ammonia nitrogen and total nitrogen is too large, and the efficient and stable operation is difficult to realize. The ion exchange method limits the application of the ion exchange method due to low selectivity of the ion exchanger, difficult treatment of the regeneration liquid and high regeneration cost.
The Chinese patent application CN201810052595.3 discloses a device and a method for efficiently removing ammonia nitrogen in water, but the total nitrogen cannot be effectively reduced because the product exists in the form of nitrate nitrogen.
The anaerobic ammonia oxidation technology is adopted for deep denitrification of municipal sewage, a carbon source does not need to be added, and the method has great advantages in economy. However, anammox technology relies on front-end processes to produce and accumulate stable nitrite nitrogen. Because the ammonia nitrogen concentration of the municipal sewage is very low (usually about 40mg/L), the front-end process is difficult to stably generate and accumulate nitrite nitrogen due to the low ammonia nitrogen concentration, and the anaerobic ammonia oxidation technology cannot be popularized on the municipal sewage treatment.
[ summary of the invention ]
Aiming at the defect that municipal water polluted by low-concentration ammonia nitrogen is difficult to denitrify, the invention provides a water treatment system which can continuously, efficiently and stably convert low-concentration ammonia nitrogen into nitrite nitrogen without adding extra carbon source.
Therefore, the invention provides a water treatment system applying an ammonium catalyst, which comprises a water inlet tank, a catalytic reaction tank, a water production tank and a regenerated liquid storage tank, wherein the lower part of the catalytic reaction tank is provided with a water inlet, a water outlet and a regenerated liquid outlet, the upper part of the catalytic reaction tank is provided with a water production port and a regenerated liquid inlet, the water inlet tank is connected with the water inlet of the catalytic reaction tank through a water inlet pipeline, and the water production port of the catalytic reaction tank is connected with the water production tank through a water production pipeline; the regeneration liquid storage tank is connected with a regeneration liquid inlet and a regeneration liquid outlet of the catalytic reaction tank through a regeneration liquid conveying pipeline and a regeneration liquid recovery pipeline; an aeration system is arranged in the catalytic reaction tank; an ammonium catalyst is loaded in the catalytic reaction tank, and a NaClO solution is filled in the regenerated liquid storage tank.
In the invention, the ammonium catalyst is an active iron manganese oxide ammonium catalyst, and particularly, the ammonium catalyst is prepared by adopting the preparation method disclosed in the Chinese patent application CN 113083317A.
According to a preferred embodiment, the concentration of the NaClO solution is between 100mg/L and 1000 mg/L. In general, too high a NaClO solution may generate byproducts, thereby affecting the structure of the product; and the low concentration can lead to short regeneration time, so that the regeneration effect of the ammonium catalyst is reduced, and the subsequent catalytic oxidation effect is influenced. Therefore, the concentration of NaClO solution is selected to be 100mg/L-1000mg/L to obtain the best regeneration effect.
In the invention, the water inlet electromagnetic valve, the water production pipeline are provided with a water production electromagnetic valve, the regenerated liquid conveying pipeline is provided with a regenerated liquid conveying electromagnetic valve, the regenerated liquid recovery pipeline is provided with a regenerated liquid recovery electromagnetic valve, and the aeration system is internally provided with an aeration electromagnetic valve for controlling the gas flow rate.
Preferably, the water generating tank is also connected to the catalytic reaction tank through a flushing pipeline, and a flushing electromagnetic valve is arranged on the flushing pipeline; the water outlet is connected with a water drainage pipeline, and a water drainage electromagnetic valve is arranged on the water drainage pipeline.
In the invention, a nitrate nitrogen online detection device is arranged on the water production pipeline.
The method of operating the water treatment system of the present invention comprises the following stages:
(1) ammonia nitrogen catalytic oxidation stage
Opening a water inlet battery valve, a water production electromagnetic valve and an aeration electromagnetic valve, enabling the nitrate nitrogen online detection device to be in an operating state, and closing a flushing electromagnetic valve, a drainage electromagnetic valve, a regenerated liquid conveying electromagnetic valve and a regenerated liquid recovery electromagnetic valve; waste water in the water inlet tank enters the catalytic reaction tank through a water inlet pipeline, the hydraulic retention time is 0.1-1h, aeration is maintained to enable dissolved oxygen in water to be in a saturated state, an alarm threshold value of the nitrate nitrogen online detection device is set, and when the concentration of nitrate nitrogen in produced water is lower than the alarm threshold value, the current operation state is maintained;
(2) regeneration stage of ammonium catalyst
When the concentration of the nitrate nitrogen in the produced water reaches an alarm threshold value, closing a water inlet electromagnetic valve, a water production electromagnetic valve and an aeration electromagnetic valve, opening a regenerated liquid conveying electromagnetic valve and a regenerated liquid recovery electromagnetic valve, soaking the ammonium catalyst in the catalytic reaction tank for 10-60min by using the NaClO solution in a regenerated liquid storage tank, then closing the regenerated liquid conveying electromagnetic valve, maintaining the regenerated liquid recovery electromagnetic valve in an open state until the NaClO solution in the catalytic reaction tank is completely recovered into the regenerated liquid storage tank, and closing the regenerated liquid recovery electromagnetic valve;
(3) flushing stage of catalytic reaction tank
Opening a flushing electromagnetic valve and a water discharging electromagnetic valve, sending the produced water in a water producing tank into a catalytic reaction tank, cleaning an ammonium catalyst to thoroughly remove residual NaClO solution, emptying the catalytic reaction tank through a water discharging pipeline, and then closing a water discharging electromagnetic valve;
repeating the step (1).
According to a preferred embodiment, the alarm threshold for the nitrate nitrogen concentration is 5mg/L
The ammonium catalyst is used for deammoniation reaction of low-concentration ammonia nitrogen water body, and the mechanism is that high-valence Mn (III/IV) in manganese oxide and low-concentration ammonia nitrogen can generate oxidation reduction reaction, so that nitrite nitrogen is produced. Considering that the running time is increased, the low-valence Mn (II) is not easy to be recovered to the high-valence Mn (III/IV), so that the total valence of Mn is lowered, and the product has the generation of nitrate nitrogen. In order to avoid generating nitrate nitrogen, when excessive oxidation of the product nitrate nitrogen occurs in the product, the ammonium catalyst in the reaction system is treated by supplementing a strong oxidant NaClO solution to increase high-valence Mn (III/IV) and reduce low-valence Mn (II), thereby restoring the catalyst. By the method, the ammonium catalyst can continuously, efficiently and stably convert low-concentration ammonia nitrogen in the water body into nitrite nitrogen.
The ammonium catalyst can combine the ammonium removal technology with the anaerobic ammonium oxidation technology, and avoids additional carbon source feeding in the deep denitrification process, thereby improving the quality of produced water and reducing the sewage resource cost.
Based on the mechanism, when the water treatment system operates, the low-concentration ammonia nitrogen sewage is pumped from the water inlet tank to the catalytic reaction tank and contacts with the ammonium catalyst in the catalytic reaction tank under the continuous aeration effect, and NH in the sewage4 +The ions contact with the surface of the catalyst, and the produced water flows out to the water producing pool through the upper part of the catalytic reaction pool by a pipeline. And monitoring the nitrate nitrogen concentration in the catalytic reaction tank by using an online nitrate nitrogen detector, and stopping water inlet and outlet of the catalytic reaction tank and stopping aeration when the nitrate nitrogen concentration is higher than 5 mg/L.
Then, the NaClO aqueous solution in the regeneration liquid storage tank is pumped into a catalytic reaction tank through an electromagnetic valve and a pump on a pipeline, the soaking and the circulation are carried out for 10-60min, then the NaClO aqueous solution in the system is completely recovered to the regeneration liquid storage tank, the ammonium catalyst is cleaned by produced water to remove the residual NaClO on the surface of the catalyst, and the sewage generated by cleaning the catalyst is discharged from a water outlet at the bottom of the catalytic reaction tank.
After thorough cleaning, the water inlet, the water outlet and the aeration system of the catalytic reaction tank are restarted to start water production.
Aiming at the defect that the conventional ammonium catalyst cannot continuously and stably produce the nitrite nitrogen in the process of the deammoniation reaction, after the system runs for a period of time and when the over-oxidation product nitrate nitrogen begins to be generated, the NaClO aqueous solution is adopted to treat the ammonium catalyst, so that the ammonium catalyst can be restored to the state capable of stably producing the nitrite nitrogen, and the service life of the ammonium catalyst is prolonged.
The preparation method has the advantages of simple steps, mild conditions, high synthesis efficiency, low raw material cost, obvious economic benefit, high deaminizing efficiency of the obtained catalyst and long service life.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the mechanism of the ammonium catalyst of the present invention;
FIG. 2 is a schematic view of the structure of a reaction apparatus in example 1;
wherein: 1. a water inlet electromagnetic valve; 2. an aeration electromagnetic valve; 3. a water discharge electromagnetic valve; 4. a water production solenoid valve; 5. cleaning the electromagnetic valve; 6. a regenerated liquid delivery solenoid valve; 7. a regenerated liquid recovery electromagnetic valve; 8. an on-line detector.
[ detailed description ] embodiments
The following examples serve to explain the technical solution of the invention without limiting it.
In the present invention, "%" used for explaining concentrations is a weight percent, ": all the terms are by weight.
In the invention, an ammonia nitrogen online detector is used for detecting the ammonia nitrogen concentration in water.
And monitoring the concentration of the nitrate nitrogen in the water by using a nitrate nitrogen detector.
Example 1
Firstly, preparing the formed ammonium catalyst
A black powder sample of the ammonium catalyst was prepared according to the teaching of example 1 of the Chinese patent application CN 202110372700.3.
Mixing polyvinyl alcohol with hot water, fully dissolving the polyvinyl alcohol by strong mechanical stirring to obtain a polyvinyl alcohol aqueous solution (the mass concentration is 15%), and then adding an ammonium catalyst black powder sample.
Wherein the black powder of the ammonium catalyst and the polyvinyl alcohol satisfy the relationship:
in this example, a 10% concentration was selected.
Fully stirring to obtain black slurry;
the resulting slurry was injected into saturated H3BO3And standing the solution for 6 to 24 hours to ensure that the polyvinyl alcohol is completely crosslinked to obtain a black solid, and filtering, cleaning and drying the obtained black solid to obtain a formed ammonium catalyst sample.
Second, evaluation of Performance
And (3) taking back an actual water sample in a certain municipal sewage treatment plant in Beijing, and measuring the ammonia nitrogen concentration in the water sample to be 40 mg/L.
The system shown in FIG. 2 was designed by loading 8L of water sample in a water inlet tank and filling 100g of ammonium catalyst in a transparent column of plexiglass with a diameter of 7cm and a height of 40 cm.
In the ammonia nitrogen catalytic oxidation stage, an aeration electromagnetic valve, a water inlet electromagnetic valve, a water production electromagnetic valve and a nitrate nitrogen online detector are opened, and a regenerated liquid conveying electromagnetic valve, a regenerated liquid recovery electromagnetic valve, a cleaning electromagnetic valve and a drainage electromagnetic valve are all closed. The ammonia nitrogen concentration of the inlet water is 40mg/L, the retention time of the water flow of the inlet water is 0.1-1h, and the operation of the aeration system is maintained at the stage to ensure that the dissolved oxygen in the water is in a saturated state. The person skilled in the art can adjust the aeration amount according to the prior common knowledge, for example, the air intake amount is 0.5-2L/min in the embodiment. And continuously detecting the nitrate nitrogen concentration of the produced water by using a nitrate nitrogen online detector, and when the nitrate nitrogen concentration of the produced water is less than 5mg/L, maintaining the operation of the system.
And when the concentration of the nitrate nitrogen in the produced water is more than 5mg/L, closing the water inlet electromagnetic valve, the water production electromagnetic valve and the aeration electromagnetic valve, and stopping the water inlet, the water production and the aeration of the system.
Then entering a NaClO ammonium catalyst regeneration stage. And after the water inlet electromagnetic valve, the water production electromagnetic valve and the aeration electromagnetic valve are closed, the regeneration liquid conveying electromagnetic valve and the regeneration liquid recovery electromagnetic valve are automatically opened, 100mg/L NaClO aqueous solution is pumped to carry out dynamic cycle impregnation on the catalyst for 10min-60min, then the regeneration liquid conveying electromagnetic valve is closed, and the regeneration liquid recovery electromagnetic valve continues to work for 10min, so that the NaClO solution in the ammonium catalyst column is ensured to completely flow back to the regeneration liquid storage tank. Then, the regeneration liquid recovery electromagnetic valve is closed, the cleaning electromagnetic valve and the water discharge electromagnetic valve are opened, and the produced water is pumped into the ammonium catalyst column to clean the ammonium catalyst so as to remove the NaClO remained on the surface of the ammonium catalyst. And (3) enabling waste liquid generated in the cleaning process to flow out of the column from a drain pipe controlled by a drain electromagnetic valve at the bottom of the column, closing the cleaning electromagnetic valve and the drain electromagnetic valve after cleaning for 10min, and then carrying out the next round of catalytic oxidation operation of ammonia nitrogen water inlet.
The ammonium catalyst was evaluated by such a dynamic continuous water feed method. As shown in Table 1, the catalytic performance of the ammonium catalyst showed an upward trend with the increase of the operating time, the ammonia nitrogen concentration in the produced water gradually decreased, and the nitrite nitrogen concentration gradually increased. The ammonia-nitrogen conversion was calculated according to the following formula:
After 2 days on stream, the ammonia-nitrogen conversion reached equilibrium. The conversion rate of ammonia and nitrogen is about 90%. The product is mainly nitrite nitrogen, the selectivity is 99 percent, and the nitrate nitrogen concentration can not be detected almost.
After the system operates stably for 25 days, the over-oxidized product nitrate nitrogen is detected on line, and the concentration exceeds 5 mg/L. At the moment, stopping water inflow, introducing 100mg/L NaClO solution to circularly soak the ammonium catalyst for 30min, and then introducing qualified produced water to clean the catalyst for 10 min.
And continuously feeding water again, wherein according to the real-time reading of the detection system, the over-oxidation product nitrate nitrogen is not detected, and the selectivity of the nitrite nitrogen reaches 99%. No formation of nitrate nitrogen was detected by continuing the operation for 40 days.
TABLE 1 ammonium catalyst Performance Table
Example 2
Preparation of ammonium catalyst
A black powder sample of the ammonium catalyst was prepared according to the teaching of example 2 of chinese patent application CN 202110372700.3.
Polyvinyl alcohol is taken to be mixed with hot water, the polyvinyl alcohol is fully dissolved through strong mechanical stirring to obtain a polyvinyl alcohol aqueous solution (the mass concentration is 15%), and then an ammonium catalyst black powder sample is added.
Wherein, the black powder of the ammonium catalyst and the polyvinyl alcohol satisfy the relation:
in this example, a 10% concentration was selected.
Fully stirring to obtain black slurry;
the resulting slurry was injected into saturated H3BO3And standing the solution for 6 to 24 hours to ensure that the polyvinyl alcohol is completely crosslinked to obtain a black solid, and filtering, cleaning and drying the obtained black solid to obtain a formed ammonium catalyst sample.
Second, evaluation of Performance
The performance of the obtained catalyst was evaluated in the same manner as in example 1. As shown in the table 2 below, the following examples,
TABLE 2 ammonium catalyst Performance Table
Similarly, after 2.5 days on stream, the ammonia nitrogen conversion reached an equilibrium state with an ammonia nitrogen conversion of about 90% and a nitrite nitrogen selectivity of 99%, with no nitrate nitrogen detected by the system. After stable operation for 28 days, the appearance of the over-oxidized product, namely, nitrate nitrogen, is detected on line.
Stopping water inflow, introducing 500mg/L NaClO solution to soak the ammonium catalyst for 1h, and then introducing qualified produced water to clean the catalyst. Then, water was continuously fed again, and no excess oxidation product, nitrate nitrogen, was detected. The stable operation is continued for 45 days, and no nitrate nitrogen is generated.
The ammonium catalyst can be effectively applied to sewage with low ammonia nitrogen concentration and used for deaminizing reaction. High valence state Mn (III/IV) in the catalyst can generate oxidation reduction reaction with ammonia nitrogen to generate nitrite nitrogen. With the increase of the operation time, when the total valence state of Mn in the catalyst is lowered to cause the appearance of nitrate nitrogen in a system product, the ammonium catalyst can be treated by a strong oxidant such as NaClO aqueous solution, so that high-valence Mn (III/IV) can be increased, low-valence Mn (II) can be reduced, the catalyst can be recovered, and continuous, efficient and stable production of nitrite nitrogen can be realized.
The invention combines the deammoniation technology and the anaerobic ammonium oxidation technology, realizes the deep denitrification of the municipal sewage without adding a carbon source, improves the quality of produced water and reduces the resource cost of the sewage.
Claims (9)
1. A water treatment system applying an ammonium catalyst is characterized by comprising a water inlet tank, a catalytic reaction tank, a water production tank and a regenerated liquid storage tank, wherein the lower part of the catalytic reaction tank is provided with a water inlet, a water outlet and a regenerated liquid outlet, the upper part of the catalytic reaction tank is provided with a water production port and a regenerated liquid inlet, the water inlet tank is connected with the water inlet of the catalytic reaction tank through a water inlet pipeline, and the water production port of the catalytic reaction tank is connected with the water production tank through a water production pipeline; the regeneration liquid storage tank is connected with a regeneration liquid inlet and a regeneration liquid outlet of the catalytic reaction tank through a regeneration liquid conveying pipeline and a regeneration liquid recovery pipeline; an aeration system is arranged in the catalytic reaction tank; an ammonium catalyst is loaded in the catalytic reaction tank, and a NaClO solution is filled in the regenerated liquid storage tank.
2. The water treatment system using an ammonium catalyst according to claim 1, wherein the ammonium catalyst is an active ammonium iron manganese oxide catalyst.
3. The water treatment system using an ammonium catalyst according to claim 1, wherein the concentration of the NaClO solution is 100mg/L to 1000 mg/L.
4. The water treatment system using ammonium catalyst according to claim 1, wherein a water inlet solenoid valve is provided on the water inlet pipe, a water production solenoid valve is provided on the water production pipe, a regeneration liquid delivery solenoid valve is provided on the regeneration liquid delivery pipe, a regeneration liquid recovery solenoid valve is provided on the regeneration liquid recovery pipe, and an aeration solenoid valve for controlling the gas flow rate is provided in the aeration system.
5. The system of claim 1, wherein the water generating tank is further connected to the catalytic reaction tank via a flushing line, and a flushing solenoid valve is disposed on the flushing line.
6. The system for treating water using an ammonium catalyst according to claim 1, wherein the drain port is connected to a drain line, and a drain solenoid valve is provided on the drain line.
7. The water treatment system using the ammonium catalyst as recited in claim 1, wherein an online nitrate nitrogen detection device is disposed on the water production pipeline.
8. Method of operating a water treatment system according to any of claims 1-7, comprising the following phases:
(1) ammonia nitrogen catalytic oxidation stage
Opening a water inlet battery valve, a water production electromagnetic valve and an aeration electromagnetic valve, enabling the nitrate nitrogen online detection device to be in an operating state, and closing a flushing electromagnetic valve, a drainage electromagnetic valve, a regenerated liquid conveying electromagnetic valve and a regenerated liquid recovery electromagnetic valve; wastewater in the water inlet tank enters the catalytic reaction tank through the water inlet pipeline, the hydraulic retention time is 0.1-1h, aeration is maintained to enable dissolved oxygen in water to be in a saturated state, an alarm threshold value of the nitrate nitrogen online detection device is set, and when the nitrate nitrogen concentration in produced water is lower than the alarm threshold value, the current operation state is maintained;
(2) regeneration stage of ammonium catalyst
When the concentration of nitrate nitrogen in the produced water reaches an alarm threshold value, closing a water inlet electromagnetic valve, a water production electromagnetic valve and an aeration electromagnetic valve, opening a water discharge electromagnetic valve to empty the residual water in the catalytic reaction tank, opening a regenerated liquid conveying electromagnetic valve and a regenerated liquid recovery electromagnetic valve, soaking an ammonium catalyst in the catalytic reaction tank for 10-60min by using a NaClO solution in a regenerated liquid storage tank, then closing the regenerated liquid conveying electromagnetic valve, maintaining the regenerated liquid recovery electromagnetic valve in an open state until the NaClO solution in the catalytic reaction tank is completely recovered into the regenerated liquid storage tank, and closing the regenerated liquid recovery electromagnetic valve;
(3) flushing stage of catalytic reaction tank
Opening a flushing electromagnetic valve and a water discharging electromagnetic valve, sending the produced water in the water producing tank into a catalytic reaction tank, cleaning an ammonium catalyst to thoroughly remove residual NaClO solution, emptying the catalytic reaction tank through a water discharging pipeline, and then closing a water discharging electromagnetic valve;
repeating the step (1).
9. Operating method according to claim 8, characterised in that the alarm threshold for nitrate nitrogen concentration is 5 mg/L.
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| CN115608334A (en) * | 2022-10-16 | 2023-01-17 | 北京碧水源膜科技有限公司 | NH (hydrogen sulfide) 4+ /NO 2- Composite adsorbent, preparation method thereof and ammonia nitrogen treatment system applying composite adsorbent |
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| CN113880319A (en) * | 2021-11-19 | 2022-01-04 | 上海言征分离技术有限公司 | Ammonia nitrogen wastewater treatment method and system |
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| KR20160042774A (en) * | 2014-10-10 | 2016-04-20 | 정동수 | Wastewater treatment system improving T-N quality of effluent water through pre-treatment of reducing nitrogen in returning water from dehydration process at the digestion tank of community sewage disposal plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115608334A (en) * | 2022-10-16 | 2023-01-17 | 北京碧水源膜科技有限公司 | NH (hydrogen sulfide) 4+ /NO 2- Composite adsorbent, preparation method thereof and ammonia nitrogen treatment system applying composite adsorbent |
| CN115608334B (en) * | 2022-10-16 | 2023-11-28 | 北京碧水源膜科技有限公司 | NH (NH) 4+ /NO 2- Composite adsorbent, preparation method thereof and ammonia nitrogen treatment system applying composite adsorbent |
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