CN112939373A - Method for treating desulfurization and denitrification wastewater by oxidation process - Google Patents
Method for treating desulfurization and denitrification wastewater by oxidation process Download PDFInfo
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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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- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- 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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- 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
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention discloses a method for treating desulfurization and denitrification wastewater by an oxidation method, belongs to the technical field of wastewater treatment, and aims to solve the problem of NO in the existing oxidation treatment process of sulfur-containing and nitrate-containing wastewater3 ‑Too high content and can not be directly discharged. Which comprises the following steps: (1) adding calcium hydroxide into the sulfur-containing and nitrate-containing wastewater for neutralization to form calcium sulfate precipitateTo remove SO in the wastewater4 2‑Introducing the neutralized wastewater into a reaction tank; (2) adding a PAM flocculating agent and a PAC flocculating agent into the reaction tank, performing filter pressing treatment on the generated precipitated sludge, and conveying the generated overflow clear liquid into an A/O (anaerobic/oxic) tank; (3) treating the overflow clear liquid in an A/O pool to reduce NO in the wastewater3 ‑Then the mixture is introduced into an ultrafiltration machine for ultrafiltration treatment; (4) and introducing the clear liquid generated by the ultrafiltration treatment into a special filter, concentrating and filtering the clear liquid by a special filter membrane, separating out clear liquid and concentrated liquid, introducing the concentrated liquid into the reaction tank for retreatment, and recycling the clear liquid. The method is suitable for treating desulfurization and denitrification wastewater by an oxidation method.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of desulfurization and denitrification wastewater by an oxidation method.
Background
At present, a large amount of nitrate-containing waste water is generated in the chemical production process, and the nitrogen oxides in the nitrate-containing waste water are usually removed by an SCR method and an oxidation method at the present stage. The existing oxidation method can generate a large amount of NO when removing nitrogen oxides in wastewater3 ˉThe wastewater contains a large amount of NO3 ˉCan not be directly discharged, and is inconvenient to treat. Therefore, the development of the method for treating the desulfurization and denitrification wastewater by the oxidation method, which can directly discharge clear liquid, has important significance.
Disclosure of Invention
The invention aims to: provides a method for treating desulfurization and denitrification wastewater by an oxidation method, and solves the problem of NO in the prior oxidation treatment process of sulfur-containing and nitrate-containing wastewater3 ˉToo high content and can not be directly discharged.
The technical scheme adopted by the invention is as follows:
a method for treating desulfurization and denitrification wastewater by an oxidation method comprises the following steps:
(1) adding calcium hydroxide into the sulfur-containing and nitrate-containing wastewater for neutralization to form calcium sulfate precipitate for removing SO in the wastewater4 2ˉIntroducing the neutralized wastewater into a reaction tank;
(2) adding a PAM flocculating agent and a PAC flocculating agent into the wastewater in the reaction tank for flocculation and sedimentation treatment, performing filter pressing treatment on the generated precipitated sludge through a plate-and-frame filter press, and conveying the generated overflow clear liquid into an A/O (anaerobic/oxic) tank;
(3) the overflow clear liquid generated by the flocculation sedimentation treatment is treated by an anaerobic and aerobic process in an A/O pool to reduce NO in the wastewater3 ˉThen the mixture is introduced into an ultrafiltration machine for ultrafiltration treatment;
(4) and introducing the clear liquid generated by the ultrafiltration treatment into a special filter, concentrating and filtering the clear liquid by a special filter membrane, separating out the clear liquid and a concentrated liquid containing solid suspended matters, introducing the concentrated liquid into the reaction tank for retreatment, and recycling the clear liquid.
Furthermore, the material of the special filter membrane is a polyamide composite membrane.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the invention, SO in the sulfur-containing and nitrate-containing wastewater is effectively removed after calcium hydroxide neutralization, PAM flocculant and PAC flocculant flocculation and precipitation, A/O process, ultrafiltration by an ultrafilter and filtration by a special filter4 2ˉAnd NO3 ˉReduction of NO by A/O treatment3 ˉThe content of the nitric acid in the wastewater can ensure that the treated clear liquid can be directly discharged or recycled, thereby solving the problem of NO in the prior oxidation treatment process of the wastewater containing sulfur and nitre3 ˉToo high content and can not be directly discharged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: reference numerals and letters designate similar items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when in use, and are simply used for simplifying the description of the present invention, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; mechanical connection or electrical connection can be realized; the two original pieces can be directly connected or indirectly connected through an intermediate medium, or the two original pieces can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A method for treating desulfurization and denitrification wastewater by an oxidation method comprises the following steps:
(1) adding calcium hydroxide into the sulfur-containing and nitrate-containing wastewater for neutralization to form calcium sulfate precipitate for removing SO in the wastewater4 2ˉIntroducing the neutralized wastewater into a reaction tank;
(2) adding a PAM flocculating agent and a PAC flocculating agent into the wastewater in the reaction tank for flocculation and sedimentation treatment, performing filter pressing treatment on the generated precipitated sludge through a plate-and-frame filter press, and conveying the generated overflow clear liquid into an A/O (anaerobic/oxic) tank;
(3) the overflow clear liquid generated by the flocculation sedimentation treatment is treated by an anaerobic and aerobic process in an A/O pool to reduce NO in the wastewater3 ˉThen the mixture is introduced into an ultrafiltration machine for ultrafiltration treatment;
(4) and introducing the clear liquid generated by the ultrafiltration treatment into a special filter, concentrating and filtering the clear liquid by a special filter membrane, separating out the clear liquid and a concentrated liquid containing solid suspended matters, introducing the concentrated liquid into the reaction tank for retreatment, and recycling the clear liquid.
Furthermore, the material of the special filter membrane is a polyamide composite membrane.
In the implementation process of the invention, SO in the wastewater is effectively removed from the sulfur-containing and nitrate-containing wastewater after calcium hydroxide neutralization, PAM flocculant and PAC flocculant flocculation and precipitation, A/O process, ultrafiltration by an ultrafilter and filtration by a special filter4 2ˉAnd NO3 ˉReduction of NO by A/O treatment3 ˉThe content of the wastewater can ensure that the treated clear liquid can be directly discharged or recycled, thereby solving the problem of the prior sulfur-containing and nitrate-containing wasteNO in water oxidation treatment process3 ˉToo high content and can not be directly discharged.
Example 1
A method for treating desulfurization and denitrification wastewater by an oxidation method comprises the following steps:
(1) adding calcium hydroxide into the sulfur-containing and nitrate-containing wastewater for neutralization to form calcium sulfate precipitate for removing SO in the wastewater4 2ˉIntroducing the neutralized wastewater into a reaction tank;
(2) adding a PAM flocculating agent and a PAC flocculating agent into the wastewater in the reaction tank for flocculation and sedimentation treatment, performing filter pressing treatment on the generated precipitated sludge through a plate-and-frame filter press, and conveying the generated overflow clear liquid into an A/O (anaerobic/oxic) tank;
(3) the overflow clear liquid generated by the flocculation sedimentation treatment is treated by an anaerobic and aerobic process in an A/O pool to reduce NO in the wastewater3 ˉThen the mixture is introduced into an ultrafiltration machine for ultrafiltration treatment;
(4) and introducing the clear liquid generated by the ultrafiltration treatment into a special filter, concentrating and filtering the clear liquid by a special filter membrane, separating out the clear liquid and a concentrated liquid containing solid suspended matters, introducing the concentrated liquid into the reaction tank for retreatment, and recycling the clear liquid.
The above description is an embodiment of the present invention. The foregoing is a preferred embodiment of the present invention, and the preferred embodiments in the preferred embodiments can be combined and used in any combination if not obviously contradictory or prerequisite to a certain preferred embodiment, and the specific parameters in the embodiments and examples are only for the purpose of clearly illustrating the verification process of the invention and are not intended to limit the patent protection scope of the present invention, which is subject to the claims and all the equivalent structural changes made by the content of the description and the drawings of the present invention are also included in the protection scope of the present invention.
Claims (2)
1. A treatment method of desulfurization and denitrification wastewater by an oxidation method is characterized by comprising the following steps:
(1) adding calcium hydroxide into sulfur-containing and nitrate-containing wastewaterNeutralizing to form calcium sulfate precipitate for removing SO in wastewater4 2-Introducing the neutralized wastewater into a reaction tank;
(2) adding a PAM flocculating agent and a PAC flocculating agent into the wastewater in the reaction tank for flocculation and sedimentation treatment, performing filter pressing treatment on the generated precipitated sludge through a plate-and-frame filter press, and conveying the generated overflow clear liquid into an A/O (anaerobic/oxic) tank;
(3) the overflow clear liquid generated by the flocculation sedimentation treatment is treated by an anaerobic and aerobic process in an A/O pool to reduce NO in the wastewater3 -Then the mixture is introduced into an ultrafiltration machine for ultrafiltration treatment;
(4) and introducing the clear liquid generated by the ultrafiltration treatment into a special filter, concentrating and filtering the clear liquid by a special filter membrane, separating out the clear liquid and a concentrated liquid containing solid suspended matters, introducing the concentrated liquid into the reaction tank for retreatment, and recycling the clear liquid.
2. The method for treating desulfurization and denitrification wastewater by oxidation according to claim 1, wherein the material of the special filter membrane is a polyamide composite membrane.
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Citations (7)
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|---|---|---|---|---|
| EP0775514A1 (en) * | 1995-11-27 | 1997-05-28 | Ebara Corporation | Method for treating exhaust gases and foul water |
| CN101993169A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Treatment method of sintering flue gas desulphurization wastewater |
| CN102010107A (en) * | 2010-12-24 | 2011-04-13 | 波鹰(厦门)科技有限公司 | Treatment and cyclic utilization device and method of tannery wastewater |
| CN201915009U (en) * | 2010-12-24 | 2011-08-03 | 波鹰(厦门)科技有限公司 | Tannery wastewater treatment recycling device based on catalytic electrolysis and biochemical technique |
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-
2021
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Patent Citations (7)
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| EP0775514A1 (en) * | 1995-11-27 | 1997-05-28 | Ebara Corporation | Method for treating exhaust gases and foul water |
| CN101993169A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Treatment method of sintering flue gas desulphurization wastewater |
| CN102010107A (en) * | 2010-12-24 | 2011-04-13 | 波鹰(厦门)科技有限公司 | Treatment and cyclic utilization device and method of tannery wastewater |
| CN201915009U (en) * | 2010-12-24 | 2011-08-03 | 波鹰(厦门)科技有限公司 | Tannery wastewater treatment recycling device based on catalytic electrolysis and biochemical technique |
| WO2017133511A1 (en) * | 2016-02-05 | 2017-08-10 | 大唐环境产业集团股份有限公司 | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater |
| CN109851156A (en) * | 2018-12-29 | 2019-06-07 | 中冶赛迪工程技术股份有限公司 | A kind of glass waste water reuse treatment method and system |
| CN111892248A (en) * | 2020-08-05 | 2020-11-06 | 张建东 | Biological treatment system for removing pollutants in flue gas desulfurization wastewater |
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Application publication date: 20210611 |