CN114605007A - Device and method for treating nitrate radical exchange resin regeneration waste liquid - Google Patents
Device and method for treating nitrate radical exchange resin regeneration waste liquid Download PDFInfo
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- CN114605007A CN114605007A CN202210367387.9A CN202210367387A CN114605007A CN 114605007 A CN114605007 A CN 114605007A CN 202210367387 A CN202210367387 A CN 202210367387A CN 114605007 A CN114605007 A CN 114605007A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2101/163—Nitrates
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Abstract
The invention discloses a device and a method for treating regenerated waste liquid of nitrate radical exchange resin, belonging to the technical field of sewage treatment, wherein the regenerated waste liquid generated by regenerating saturated nitrate radical ion exchange resin is treated by an active carbon adsorption device to remove COD (chemical oxygen demand) in the regenerated waste liquid, a nitrate radical removal reaction device to remove nitrate radical in the regenerated waste liquid, then the regenerated waste liquid is pumped into a impurity removal unit to remove macromolecular impurities, a salt separation unit is used for filtering divalent salt and high-valent salt in the regenerated waste liquid, then the regenerated waste liquid mainly containing sodium chloride is sent to a concentration unit, and the solution containing sodium chloride is concentrated to the concentration required by a regenerant and then sent to a regenerant storage and preparation device; and sending the obtained deionized water to a deionized water storage and reuse device. The invention has high nitrate radical removing efficiency, small device occupied area and simple operation, and the sodium chloride regenerant can be repeatedly recycled for a long time after being purified, thereby avoiding the influence caused by the discharge of the sodium chloride in the regenerated waste liquid to the environment.
Description
Technical Field
The invention relates to the technical field related to sewage treatment, in particular to a device and a method for treating nitrate radical exchange resin regeneration waste liquid.
Background
With the great development of science and technology and the improvement of living standard, the health care consciousness and the environmental protection consciousness of the whole society reach an unprecedented new height. Due to the use of nitrogen fertilizer in agricultural production, the nitrate concentration in underground water is increased, nitrate is harmless, but nitrate can be reduced into nitrite in an oxygen-deficient environment. Nitrite has carcinogenic effect, can cause complications of a series of diseases, and is harmful to human health. This affects the quality of tap water for the residents to a certain extent. In order to ensure the quality of tap water for urban and rural residents, the underground water with overproof nitrate radical in tap water used for daily life of the residents needs to be treated, and the treated underground water reaches the standards set by relevant national departments and is used by the urban and rural residents. In the sewage discharge standard, the total nitrogen content is an important index. Because the tail water of sewage treatment has no biodegradability, nitrogen can not be reduced by using the traditional biochemical process, and nitrate radicals in the water have certain difficulty to be removed by using the traditional oxidation-reduction chemical reaction. Therefore, how to increase the total nitrogen content in the wastewater treatment tail water to the level of surface IV-class water or even III-class water is a difficult problem to be solved by many wastewater treatment units.
In the prior art, a common method for treating nitrate in wastewater is to perform exchange nitrogen removal or nitrogen reduction operation on wastewater by using nitrate exchange resin. The method has the advantages of mature technology, easily obtained raw materials, simple equipment, reliable operation, high nitrate removal rate and economic operation. However, nitrate ion exchange resins require ion exchange regeneration after a certain period of use. The exchange regeneration waste liquid containing sodium chloride with higher concentration, nitrate radical with certain concentration and organic matters with certain concentration generated in the exchange regeneration process is discharged to the environment to cause serious pollution to the environment, and if the waste liquid is circulated in a sewage treatment system, the original balance of the sodium chloride concentration in the system can be broken. Meanwhile, the living and breeding environments of microorganisms in the system are influenced in the long run, so that the treatment effect of the treatment system is influenced. Therefore, how to treat the waste water from the regeneration of nitrate exchange resin becomes a problem to be solved.
Currently, there are methods for treating the regenerated waste liquid, such as electrodialysis, ultrafiltration, reverse osmosis or a combination of ultrafiltration and reverse osmosis, as well as conventional biochemical and oxidation-reduction chemical methods. However, the components of the waste liquid after ion exchange regeneration of nitrate ion exchange resin are relatively complicated. The sodium chloride solution not only contains high-concentration sodium chloride and nitrate radical with certain concentration, but also contains organic matters with certain concentration, phosphorus-containing substances and other components. The treatment operations of electrodialysis, ultrafiltration, reverse osmosis and the like have high requirements on the content of organic matters in the treated sewage; as for the conventional biochemical treatment method, the occupied area is large, and the problems that the survival, propagation and treatment efficiency of denitrifying bacteria for reducing nitrogen in high-concentration wastewater containing sodium chloride are difficult to achieve are solved. In addition, although the recycling of the regenerated waste liquid is considered in the currently known methods for treating the nitrate ion exchange resin regenerated waste liquid, the practical feasibility and the cycle sustainability of the recycling are not considered.
Disclosure of Invention
In order to overcome the technical defects, the invention discloses a device and a method for treating regenerated waste liquid. The method has the advantages that the nitrate radical reduction removal efficiency is high, the device occupies small area, no complex structures are needed, the treated sodium chloride regenerant can be recycled, and the technical problem of water ecology damage caused by discharge of nitrate radicals and sodium chloride in the nitrate radical ion resin regeneration waste liquid to the environment is solved.
The invention provides a device for treating nitrate radical exchange resin regeneration waste liquid, comprising: a regenerant storage and preparation device, an active carbon adsorption device, a nitrate radical removal reaction device, a step-by-step filtration and purification device and a deionized water storage and reuse device; the device comprises a step-by-step filtering and purifying device, a salt separating unit and a concentration unit, wherein the step-by-step filtering and purifying device sequentially comprises an impurity removing unit, a salt separating unit connected with the impurity removing unit through a pipeline, and the concentration unit connected with the salt separating unit through a pipeline; the regenerant storage and preparation device comprises a regenerant storage and preparation device tank body; the nitrate radical removal reaction device comprises a nitrate radical removal reaction device tank body; the regenerant storage and preparation device tank is connected with an outlet of the concentration unit through a pipeline, and the activated carbon adsorption device is connected with the nitrate radical removal reaction device tank through a pipeline.
Preferably or alternatively, the outlet of the tank of the regenerant storage and dispensing device is connected to the nitrate exchange resin exchange bed through a pipeline.
Preferably or optionally, the regenerant storage and dispensing device is provided with an adjustable first chemical tank, and the nitrate removal reaction device is provided with an adjustable second chemical tank.
Preferably or optionally, the regenerant storage and dispensing device and the nitrate radical removal reaction device are respectively provided with a first sensor and a second sensor.
Preferably or optionally, the nitrate radical removal reaction device is also provided with an air blast stripping device.
Preferably or optionally, the step-by-step filtering and purifying device is connected with an original sewage treatment system of a sewage treatment plant or a public pipe network sewage treatment system matched with a resident domestic water source water treatment plant through a pipeline, and more specifically, the sewage treatment system is respectively connected with the impurity removal unit and the salt separation unit.
The invention also provides a method for treating the nitrate radical exchange resin regeneration waste liquid, which comprises the following steps:
i, conveying the regenerated waste liquid to an activated carbon adsorption device to remove COD pollutants;
II, passing the regenerated waste liquid from which the COD pollutants are removed through a nitrate radical removal reaction device to remove nitrate radicals in the regenerated waste liquid;
and III, sequentially filtering macromolecular impurities, high-valence ions and sodium chloride from the regenerated waste liquid without the nitrate radicals by a step-by-step filtering and purifying device to obtain deionized water, and conveying the deionized water to a deionized water storage and recycling device.
Preferably or optionally, the concentrated sodium chloride concentration of the regeneration waste liquid in the step IV is the same as or similar to the concentration of the regenerant in the regenerant storage and preparation device.
Has the advantages that:
(1) according to the invention, COD pollutants in the regenerated waste liquid are removed by an active carbon adsorption device from the regenerated waste liquid generated by recovering saturated nitrate ion exchange resin, nitrate in the regenerated waste liquid is removed by a nitrate removal reaction device, then the regenerated waste liquid is pumped into a impurity removal unit to remove macromolecular impurities, divalent salt or high-valent salt in the regenerated waste liquid is filtered by a salt separation unit, then the regenerated waste liquid mainly containing sodium chloride is sent to a concentration unit, and the solution containing sodium chloride is concentrated to the required concentration of a regenerant and then sent to a regenerant storage and preparation device; and the rest deionized water is sent to a deionized water storage and reuse device. The invention has high removal efficiency on nitrate ions, small occupied area of the device and simple operation, and the sodium chloride regenerant can be repeatedly recycled for a long time, thereby avoiding the influence caused by the discharge of the sodium chloride in the regenerated waste liquid to the environment.
(2) The invention can monitor the flow of the liquid in the regenerant storage and preparation device and the nitrate radical removal reaction device through a sensor, and adjust the concentration of the liquid in real time by a medicine tank.
(3) The invention arranges the blast air stripping equipment in the nitrate radical removing reaction device, which is used for removing ammonia and nitrogen generated in the nitrate radical removing reaction device.
(4) The impurity removal unit and the salt separation unit can be provided with pipelines connected with an original sewage treatment system of a sewage treatment plant or a public pipe network sewage treatment system matched with the water of the domestic water source of the sewage treatment plant, and are used for treating suspended matters, colloids, bacteria, viruses and other macromolecular impurities separated and filtered by the impurity removal unit and the salt separation unit, and divalent and high-valent salt.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Fig. 2 is a partial device diagram of the present invention.
FIG. 3 is a schematic view of a stage-by-stage filtration and purification apparatus of the present invention.
FIG. 4 is a process flow diagram of the present invention.
The reference signs are: the device comprises a regenerant storage and preparation device 1, a regenerant storage and preparation device tank body 1-1, a first medicine tank 1-2, a first sensor 1-3, an active carbon adsorption device 2, a nitrate radical removal reaction device 3, a nitrate radical removal reaction device tank body 3-1, a second medicine tank 3-2, a second sensor 3-3, a blast air stripping device 3-4, a step-by-step filtration and purification device 4, an impurity removal unit 4-1, a salt separation unit 4-2, a concentration unit 4-3 and a deionized water storage and reuse device 5.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
The invention will now be further described with reference to the following examples, which are intended to be illustrative of the invention and are not to be construed as limiting the invention. The examples, where specific techniques and reaction conditions are not indicated, can be carried out according to the techniques or conditions or product specifications described in the literature in the field. Reagents, instruments or equipment of any manufacturer not indicated are commercially available.
Example 1
The embodiment provides a device for treating nitrate radical exchange resin regeneration waste liquid, which comprises a regenerant storage and preparation device 1, an active carbon adsorption device 2, a nitrate radical removal reaction device 3, a step-by-step filtration and purification device 4 and a deionized water storage and reuse device 5. Wherein, filtering purification device includes impurity removal unit 4-1, branch salt unit 4-2, concentration unit 4-3 interconnected in proper order step by step: impurity removal unit 4-1 is used for getting rid of macromolecular impurity such as suspended solid, colloid, bacterium and virus, divides salt unit 4-2 can filter out divalent salt and the concentrated solution of high valence salt in the regeneration waste liquid, and concentration unit 4-3 can improve the solution concentration that contains the sodium chloride to the required concentration of regenerant, obtains comparatively pure sodium chloride aqueous solution that can recycle repeatedly to send to regenerant storage preparation device 1, the deionized water of system self-production sends to deionized water storage retrieval and utilization device 5 for subsequent use. Moreover, the impurity removal unit 4-1 and the salt separation unit 4-2 of the embodiment can be respectively connected with the sewage treatment system, and can be used for respectively treating suspended matters, colloids, macromolecular impurities such as bacteria and viruses, and divalent and high-valent salt which are separated and filtered out.
In addition, in this embodiment, an air blowing and air stripping device 3-4 is further disposed inside the nitrate radical removal reaction device 3, and can be used for removing ammonia gas and nitrogen gas generated in the nitrate radical removal reaction device 3. Meanwhile, the embodiment is provided with a sensor and a medicine tank, the first medicine tank 1-2 and the first sensor 1-3 are used for adjusting and monitoring the concentration of sodium chloride in the regenerant storage and preparation device 1 in real time, and the second medicine tank 3-2 and the second sensor 3-3 are used for adjusting and monitoring the redox reaction of nitrate removal in the nitrate removal reaction device 3 in real time.
The method for treating the nitrate radical exchange resin regeneration waste liquid comprises the following steps:
sending water source water of daily domestic water of residents containing nitrate radicals or sewage treatment tail water of a sewage treatment plant into a nitrate radical exchange resin exchange bed, and exchanging nitrate radicals in water bodies onto ion exchange resin through ion exchange to remove the nitrate radicals in the water bodies; when the ion exchange resin exchange reaches the saturation degree, injecting a sodium chloride regenerant with a certain concentration in the regenerant storage and preparation device 1 or called regeneration liquid into an ion resin exchange bed to regenerate the saturated resin, thereby generating regeneration waste liquid, and using deionized water to drive and clean the residual regeneration waste liquid in the resin; putting the regenerated ion exchange resin into the next batch for use again; the regeneration waste liquid which is enriched with nitrate radical and COD pollutant with certain concentration and contains a large amount of residual sodium chloride is firstly conveyed to an active carbon adsorption device 2 to remove the COD pollutant in the regeneration waste liquid; then, conveying the regenerated waste liquid from which the COD substances are removed to a nitrate radical removal reaction device 3, and reducing nitrate radicals in the regenerated waste liquid into ammonia by adopting a chemical reducing agent; then the ammonia gas in the regeneration waste liquid is removed by an air stripping method through air blowing stripping equipment 3-4. In the embodiment, the step-by-step filtration and purification device 4 is obtained by respectively combining an ultrafiltration membrane impurity removal unit, a nanofiltration membrane salt separation unit and a reverse osmosis membrane concentration unit. Then pumping the regenerated waste liquid into an ultrafiltration membrane impurity removal unit to remove suspended matters, colloids, bacteria, viruses and other macromolecular impurities in the solution; pumping the regenerated waste liquid into a nanofiltration membrane salt separation unit, removing suspended matters, colloids, bacteria, viruses and other macromolecular impurities in the solution by using a nanofiltration membrane concentrated solution containing divalent salt and high-valent salt intercepted by the nanofiltration membrane and the ultrafiltration membrane impurity removal unit, and conveying the solution to an original sewage treatment system of a sewage plant or a public sewage treatment system matched with a resident daily water source treatment plant for treatment; the permeate which mainly contains sodium chloride and permeates through the nanofiltration membrane is sent to a reverse osmosis membrane concentration unit, the concentration of the solution containing sodium chloride is improved to the concentration required by the regenerant by using a reverse osmosis membrane, a relatively pure sodium chloride aqueous solution which can be recycled is obtained, and the pure sodium chloride aqueous solution is sent to a regenerant storage and preparation device 1; the deionized water passing through the reverse osmosis membrane is sent to a deionized water storage and reuse device 5 for standby.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (8)
1. An apparatus for treating a nitrate ion exchange resin regeneration waste liquid, comprising: a regenerant storage and preparation device, an active carbon adsorption device, a nitrate radical removal reaction device, a step-by-step filtration and purification device and a deionized water storage and reuse device;
the device comprises a step-by-step filtering and purifying device, a salt separating unit and a concentration unit, wherein the step-by-step filtering and purifying device sequentially comprises an impurity removing unit, a salt separating unit connected with the impurity removing unit through a pipeline, and the concentration unit connected with the salt separating unit through a pipeline;
the regenerant storage and preparation device tank body is connected with an outlet of the concentration unit through a pipeline, and the activated carbon adsorption device is connected with the nitrate radical removal reaction device tank body through a pipeline.
2. The apparatus for treating a nitrate ion exchange resin regeneration waste liquid according to claim 1, wherein the regenerant storage and dispensing means comprises a regenerant storage and dispensing means tank; the outlet of the tank body of the regenerant storage and preparation device is connected with the nitrate radical exchange resin exchange bed through a pipeline.
3. The apparatus for treating a nitrate nitrogen-exchange resin regeneration waste liquid according to claim 1, wherein said regenerant storage and dispensing means is provided with a first adjustable chemical tank; the nitrate radical removal reaction device comprises a nitrate radical removal reaction device tank body; the nitrate radical removing reaction device is provided with an adjustable second medicine tank.
4. The apparatus for treating a nitrate nitrogen-exchanged resin recycling waste liquid according to claim 3, wherein the regenerant storage and preparation means and the nitrate nitrogen-removal reaction means are provided with a first sensor and a second sensor, respectively.
5. The apparatus for treating a nitrate nitrogen-exchange resin regeneration waste liquid according to claim 4, wherein said nitrate nitrogen-removal reaction apparatus is further provided with an air blast air stripping device.
6. The apparatus for treating nitrate exchange resin regeneration waste liquid according to claim 1, wherein the progressive filtering and purifying apparatus is connected to an original sewage treatment system of a sewage treatment plant or a public pipe network sewage treatment system adapted to a domestic household water source water treatment plant through a pipeline, and more particularly, the sewage treatment system is connected to the impurity removal unit and the salt separation unit, respectively.
7. A method for treating a nitrate nitrogen exchange resin regeneration waste liquid based on the device of any one of claims 1 to 6, comprising:
step I, conveying the regenerated waste liquid to an activated carbon adsorption device to remove COD pollutants;
II, passing the regenerated waste liquid from which the COD pollutants are removed through a nitrate radical removal reaction device to remove nitrate radicals in the regenerated waste liquid;
and III, sequentially filtering macromolecular impurities, divalent salt, high-valence salt and sodium chloride from the regenerated waste liquid without the nitrate radicals by a step-by-step filtering and purifying device, and then sending the obtained deionized water to a deionized water storage and recycling device.
8. The method for treating the waste liquid of nitrate radical exchange resin regeneration as claimed in claim 7, wherein, after filtering macromolecular impurities, divalent salt, high-valent salt and sodium chloride in sequence, the filtered sodium chloride is concentrated and purified to be the same as or similar to the concentration of the regenerant in the regenerant storage and preparation device.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116177670A (en) * | 2022-12-27 | 2023-05-30 | 武汉致远建设集团有限公司 | Recycling water treatment method and water treatment system for denitrification and dephosphorization |
| CN116730541A (en) * | 2023-06-29 | 2023-09-12 | 湖北省水利水电规划勘测设计院北京分院 | System and process for removing nitrate in water diversion period |
| CN118908458A (en) * | 2024-07-31 | 2024-11-08 | 西安西热水务环保有限公司 | Two-step ion exchange type water treatment system and method for recycling regenerated liquid |
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| CN118908458A (en) * | 2024-07-31 | 2024-11-08 | 西安西热水务环保有限公司 | Two-step ion exchange type water treatment system and method for recycling regenerated liquid |
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Application publication date: 20220610 |