CN111718069A - Process and device for removing nitrate nitrogen in industrial wastewater treatment - Google Patents
Process and device for removing nitrate nitrogen in industrial wastewater treatment Download PDFInfo
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- CN111718069A CN111718069A CN202010602681.4A CN202010602681A CN111718069A CN 111718069 A CN111718069 A CN 111718069A CN 202010602681 A CN202010602681 A CN 202010602681A CN 111718069 A CN111718069 A CN 111718069A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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Abstract
The invention discloses a process and a device for removing nitrate nitrogen in industrial wastewater treatment, which comprises an adsorption system, a regeneration system and a denitrification system, wherein the adsorption system comprises an adsorption tank, a water inlet and a water outlet are formed in the adsorption tank, the regeneration system comprises a flushing water tank, a regenerated salt tank and a regenerated liquid tank, the flushing water tank and the regenerated salt tank are both connected with the water outlet of the adsorption tank, the regenerated liquid tank is connected with the water inlet of the adsorption tank, the regenerated liquid tank is connected with the denitrification system, and the denitrification system can perform denitrification on regenerated liquid in the regenerated liquid tank and discharge nitrogen through the denitrification system after denitrification. An adsorption material is adopted to adsorb nitrate nitrogen after aerobic nitrification, after adsorption is finished, regeneration is carried out, and high-concentration regeneration liquid is reduced into nitrogen for safe discharge under the action of a reducing agent through a catalyst with a noble metal coating, so that the purposes of material balance and environmental protection and sustainable development are achieved.
Description
Technical Field
The invention relates to the field of industrial wastewater treatment, in particular to a process and a device for removing nitrate nitrogen in industrial wastewater treatment.
Background
At present, the removal of nitrate nitrogen from most industrial waste water (which may be ground water, surface water, farm drainage, aquarium or fish farm water, etc.) is accomplished by biological denitrification due to the BOD of the industrial waste water5The content is too low, and additional carbon source needs to be supplemented for treatment. However, the external carbon source is difficult to achieve precise control, and secondary pollution of wastewater is easily caused. In addition, because industrial wastewater contains a large amount of nitrate nitrogen, denitrifying bacteria are easily inhibited, the biological denitrification efficiency is greatly reduced, and the deep treatment is difficult.
Therefore, the present inventors, aiming at the above technical problems, have invented a process and apparatus for removing nitrate nitrogen in industrial wastewater treatment.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a process and a device for removing nitrate nitrogen in industrial wastewater treatment.
In order to achieve the above purposes, the invention adopts the technical scheme that: the utility model provides a device for getting rid of nitrate nitrogen among industrial waste water treatment, includes adsorption system, regeneration system and denitrification system, adsorption system includes the adsorption tank, be provided with water inlet and delivery port on the adsorption tank, regeneration system is including washing water pitcher, regeneration salt jar and regeneration fluid reservoir, wash water pitcher and regeneration salt jar all be connected with the delivery port of adsorption tank, the regeneration fluid reservoir is connected with the water inlet of adsorption tank, regeneration fluid reservoir and denitrification headtotail, just denitrification system can carry out the denitrification to the regeneration liquid in the regeneration fluid reservoir to carry out the emission of nitrogen through the denitrification system after the denitrification.
Preferably, the canister is filled with an adsorbent material. The adsorbing material is mainly resin, is a strong-base anion quaternary amine functional chloride type ion exchange material, has the granularity of 0.15-0.3 mm, has the adsorption capacity of more than 1.0meq/ml (calculated by nitrate) or more than 50mg/L (calculated by nitrate), and can also be a macroporous styrene type strong-base anion exchange resin named D890. In addition, the resin structure is macroporous, has excellent pollution resistance to low organic molecules in water, and simultaneously has good permeation resistance and mechanical strength, high exchange speed and good use performance.
Preferably, the denitrification system includes the denitrification jar, the denitrification jar is connected with the regeneration fluid reservoir, just regeneration liquid in the regeneration fluid reservoir can get into in the denitrification jar, the denitrification jar still is connected with the denitrification fungus jar, the denitrification fungus jar can carry the denitrification fungus to the denitrification jar in, and under the effect of catalyst in the denitrification jar, accomplish the denitrification, and pass through the nitrogen gas discharge port of denitrification jar carries out nitrogen gas and discharges and flow back liquid to raw water through the liquid discharge port and handle the front end to the raw water. Denitrifying the high-concentration nitrate radical solution by using denitrifying bacteria to achieve safe discharge of nitrogen, thereby ensuring the safety and reliability of the whole water treatment system.
Preferably, the denitrification system further comprises a reducing agent tank, wherein the reducing agent tank is connected with the denitrification tank and conveys reducing agent into the denitrification tank. Through the arrangement of the reducing agent, the denitrification process is accelerated, and the generation speed of nitrogen is increased.
Preferably, the catalyst in the denitrification tank is a noble metal catalyst. Platinum, palladium, rhodium, silver, ruthenium, silver, manganese or the like is generally used as the catalyst.
Preferably, the regenerating salt in the regenerating salt tank is one or more of sodium chloride, magnesium chloride or potassium chloride. In view of cost, inexpensive sodium chloride is generally used, and in view of reuse of the regenerated salt, magnesium chloride or potassium chloride is generally used.
A process for removing nitrate nitrogen in industrial wastewater treatment comprises the following process steps:
firstly, adsorbing and discharging, wherein nitrate-containing wastewater flows into an adsorption tank through a water inlet, flows into the adsorption tank from top to bottom, is adsorbed in the adsorption tank and flows out through a water outlet, and the effluent liquid is discharged after reaching the standard;
secondly, desorption regeneration, wherein a flushing water tank and a regeneration salt tank are opened, back flushing is carried out on the inside of the adsorption tank, nitrate is formed by cations and nitrate radicals in the regeneration salt, and the regeneration liquid is collected through the regeneration liquid tank connected with the adsorption tank;
and thirdly, discharging denitrification, introducing the regeneration liquid into a denitrification tank by a regeneration liquid tank, finishing denitrification in the denitrification tank by denitrifying bacteria, a reducing agent and a catalyst, discharging nitrogen into the air through a nitrogen discharge port, and refluxing the residual liquid to the front end of raw water treatment.
Preferably, in step three, the denitrifying bacteria species: reducing agent: the proportion of nitrate nitrogen is 3: 2: 1.
the invention relates to a process and a device for removing nitrate nitrogen in industrial wastewater treatment, which have the beneficial effects that an adsorption material with large adsorption capacity and high selectivity is adopted to adsorb nitrate nitrogen after aerobic nitrification, the nitrate nitrogen removal rate is over 95 percent and can reach the standard discharge, regeneration is carried out after adsorption is finished, the concentration of nitrate in a regeneration liquid can reach 16000mg/L, and the regeneration liquid with high concentration is reduced into nitrogen for safe discharge under the action of a reducing agent through a catalyst with a noble metal coating, so that the material balance is achieved, and the purposes of environmental protection and sustainable development are achieved.
Drawings
FIG. 1 is a schematic diagram of a process for removing nitrate nitrogen in industrial wastewater treatment.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to the attached figure 1, the process for removing nitrate nitrogen in industrial wastewater treatment in the embodiment comprises the following process steps:
firstly, adsorbing and discharging, wherein nitrate-containing wastewater flows into an adsorption tank through a water inlet, flows into the adsorption tank from top to bottom, is adsorbed in the adsorption tank and flows out through a water outlet, and the effluent liquid is discharged after reaching the standard;
secondly, desorption regeneration, wherein a flushing water tank and a regeneration salt tank are opened, back flushing is carried out on the inside of the adsorption tank, nitrate is formed by cations and nitrate radicals in the regeneration salt, and the regeneration liquid is collected through the regeneration liquid tank connected with the adsorption tank;
and thirdly, discharging denitrification, introducing the regeneration liquid into a denitrification tank by a regeneration liquid tank, finishing denitrification in the denitrification tank by denitrifying bacteria, a reducing agent and a catalyst, discharging nitrogen into the air through a nitrogen discharge port, and refluxing the residual liquid to the front end of raw water treatment. And denitrifying strains: reducing agent: the proportion of nitrate nitrogen is 3: 2: 1.
adsorption capacity of the adsorbent material in the canister: the nitrate-containing wastewater flows through the adsorption material on the packed bed from top to bottom, and the nitrate removal efficiency can reach more than 95%. The content of the raw water nitrate nitrogen is 500mg/L, the effluent nitrate nitrogen is below 2mg/L after passing through 50 bed volumes at the flow rate of 60 bed volumes/h, and the effluent nitrate nitrogen concentration exceeds 50mg/L after passing through 60 bed volumes, which is regarded as an adsorption breakthrough point, namely the effluent nitrate nitrogen concentration is higher than 10% of the influent nitrate nitrogen concentration. Even when in use, the flow rate of the nitrate-containing wastewater is controlled at 50 bed volumes/h, i.e. the nitrate-containing wastewater after adsorption can be discharged.
When the nitrate concentration of the wastewater in the adsorption tank reaches 95% of the feed water nitrate concentration, the adsorption is considered to be saturated. After adsorption saturation, utilizing a flushing water tank and regenerated salt to reversely flush the adsorption tank with unit volume of adsorption, wherein the flushing water amount is generally 2-4 bed volumes, 8-10% of chloride salt is used for regeneration after flushing, the regeneration liquid is generally 8 bed volumes, the content of nitrate in the regenerated regeneration liquid is more than 16000mg/L, and the regenerated regeneration liquid is flushed to 4 bed volumes by nitrate-free water. Namely, the flushing water tank performs two times of flushing, the first time is to flush the adsorbed nitrate nitrogen, and the second time is to flush after regeneration.
The regenerated regeneration liquid is catalyzed by a fixed bed with a noble metal catalyst, for example by using a silver and manganese coating, under the action of a reducing agent, denitrifying bacteria: reducing agent: nitrate nitrogen is 3: 2: 1, reducing nitrate nitrogen in the regenerated liquid into nitrogen, wherein the nitrate nitrogen content in the regenerated liquid is about 4000mg/L, reducing the nitrate nitrogen content to 780mg/L after chemical denitrification, wherein the removal rate can reach about 80%, and returning the waste liquid after denitrification to the front end of the original sewage treatment biochemical system. The denitrifying bacteria are conventional denitrifying bacteria, and the reducing agent is a chemical agent capable of reducing nitrate into nitrogen.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A device for removing nitrate nitrogen in industrial wastewater treatment is characterized in that: including adsorption system, regeneration system and denitrification system, adsorption system includes the adsorption tank, be provided with water inlet and delivery port on the adsorption tank, regeneration system is including washing water pitcher, regeneration salt jar and regeneration fluid reservoir, wash water pitcher and regeneration salt jar all be connected with the delivery port of adsorption tank, regeneration fluid reservoir is connected with the water inlet of adsorption tank, regeneration fluid reservoir and denitrification headtotail, just the denitrification system can carry out the denitrification to the regeneration liquid in the regeneration fluid reservoir to carry out the emission of nitrogen through the denitrification system after the denitrification.
2. The apparatus for removing nitrate nitrogen in industrial wastewater treatment according to claim 1, wherein: and the adsorption tank is filled with an adsorption material.
3. The apparatus for removing nitrate nitrogen in industrial wastewater treatment according to claim 1, wherein: the denitrification system includes the denitrification jar, the denitrification jar is connected with the regeneration fluid reservoir, just regeneration liquid in the regeneration fluid reservoir can get into in the denitrification jar, the denitrification jar still is connected with the denitrification fungus jar, the denitrification fungus jar can carry the denitrification fungus to the denitrification jar in, and under the effect of the catalyst in the denitrification jar, accomplish the denitrification, and pass through the nitrogen gas discharge mouth of denitrification jar carries out nitrogen gas and discharges and flow back liquid to the raw water treatment front end through liquid discharge mouth.
4. The apparatus for removing nitrate nitrogen in industrial wastewater treatment according to claim 3, wherein: the denitrification system also comprises a reducing agent tank, wherein the reducing agent tank is connected with the denitrification tank and conveys a reducing agent into the denitrification tank.
5. The apparatus for removing nitrate nitrogen in industrial wastewater treatment according to claim 3, wherein: and the catalyst in the denitrification tank is a noble metal catalyst.
6. The apparatus for removing nitrate nitrogen in industrial wastewater treatment according to claim 1, wherein: the regenerated salt in the regenerated salt tank is one or more of sodium chloride, magnesium chloride or potassium chloride.
7. A process for removing nitrate nitrogen in industrial wastewater treatment comprises the following process steps:
firstly, adsorbing and discharging, wherein nitrate-containing wastewater flows into an adsorption tank through a water inlet, flows into the adsorption tank from top to bottom, is adsorbed in the adsorption tank and flows out through a water outlet, and the effluent liquid is discharged after reaching the standard;
secondly, desorption regeneration, wherein a flushing water tank and a regeneration salt tank are opened, the inside of the adsorption tank is reversely flushed from bottom to top, the positive ions and the nitrate radicals in the regeneration salt form nitrate, and the regeneration liquid is collected through the regeneration liquid tank connected with the adsorption tank;
and thirdly, discharging denitrification, introducing the regeneration liquid into a denitrification tank by a regeneration liquid tank, finishing denitrification in the denitrification tank by denitrifying bacteria, a reducing agent and a catalyst, discharging nitrogen into the air through a nitrogen discharge port, and refluxing the residual liquid to the front end of raw water treatment.
8. The process for the removal of nitrate nitrogen in industrial wastewater treatment according to claim 7, characterized in that: in the third step, the proportion of denitrifying strains, reducing agent and nitrate nitrogen is 3: 2: 1.
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| CN202010602681.4A CN111718069A (en) | 2020-06-29 | 2020-06-29 | Process and device for removing nitrate nitrogen in industrial wastewater treatment |
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| CN202010602681.4A CN111718069A (en) | 2020-06-29 | 2020-06-29 | Process and device for removing nitrate nitrogen in industrial wastewater treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114605007A (en) * | 2022-04-08 | 2022-06-10 | 江苏富淼科技股份有限公司 | Device and method for treating nitrate radical exchange resin regeneration waste liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114605007A (en) * | 2022-04-08 | 2022-06-10 | 江苏富淼科技股份有限公司 | Device and method for treating nitrate radical exchange resin regeneration waste liquid |
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Address after: Room 1409, office, No. 319 Zhenghe Middle Road, Loudong street, Taicang City, Suzhou, Jiangsu Province Applicant after: Taicang branch of Yuzhi Tiangong Environmental Technology Co., Ltd Address before: Room 1409, office, No. 319 Zhenghe Middle Road, Loudong street, Taicang City, Suzhou, Jiangsu Province Applicant before: Taicang branch of Yuzhi Tiangong Water Environment Technology Co.,Ltd. |
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