CN115321701A - Method for softening treatment of power plant sewage and wastewater by using carbon dioxide - Google Patents
Method for softening treatment of power plant sewage and wastewater by using carbon dioxide Download PDFInfo
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- CN115321701A CN115321701A CN202210733733.0A CN202210733733A CN115321701A CN 115321701 A CN115321701 A CN 115321701A CN 202210733733 A CN202210733733 A CN 202210733733A CN 115321701 A CN115321701 A CN 115321701A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
Abstract
The invention discloses a method for softening treatment of power plant sewage by carbon dioxide, which comprises the steps of introducing carbon dioxide into the sewage to react and adjust the pH value, adding a reagent into the sewage to remove calcium ions, adding acid to adjust the pH value to be neutral, recycling, cleaning and filtering wastes, recycling effluent and recycling limestone. According to the invention, small-particle limestone is used as a calcium carbonate scaling core, the limestone gradually grows after adsorbing calcium carbonate, and large-particle limestone is reused in a desulfurization system; only adding sodium hydroxide and limestone into the clarification tank to ensure that the discharged wastewater can be completely recycled into the clarification tank and the filter backwashing water can be completely recycled into the clarification tank; has the advantages of no sludge discharge, no wastewater discharge and low treatment cost.
Description
Technical Field
The invention relates to the technical field of power plant sewage and wastewater treatment, in particular to a method for softening and treating power plant sewage and wastewater by using carbon dioxide.
Background
At present, CCUS is mainly adopted for carbon dioxide emission reduction in the thermal power industry to capture, transport and store carbon dioxide, and the CCUS is high in cost, so that the operation cost of thermal power can be greatly increased. The sewage and wastewater reuse is applied to a circulating water system of a power plant, and the circulating water system is generally treated by adopting a lime coagulation treatment mode, so that a large amount of sludge which is difficult to recycle is generated in the treatment process. Therefore, the high carbon dioxide emission reduction cost and the large amount of sludge recycled from sewage and wastewater are all the problems in the thermal power industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for softening and treating sewage and wastewater of a power plant by using carbon dioxide, so as to solve the problem that a large amount of sludge is generated in the existing sewage and wastewater treatment process and realize sludge-free discharge.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A method for softening and treating power plant sewage and wastewater by using carbon dioxide specifically comprises the following steps:
A. injecting the sewage and the wastewater into a raw water pool, introducing carbon dioxide into the raw water pool, and controlling the pH value of the mixed effluent to be 5.0-7.0;
B. sending the effluent of the raw water tank into a clarification tank, adding limestone periodically, then adding sodium hydroxide into the clarification tank, and controlling the hydroxyl radical of the effluent to reach 0.2-0.5mmol/L; detecting the hardness, calcium ions and alkalinity of inlet water and outlet water of the clarification tank according to periods to ensure that the removal rate of the calcium ions in the outlet water reaches 50-90 percent;
C. introducing the effluent of the clarification tank into a filter for filtering, adding sulfuric acid into the filtered effluent, adjusting the pH value to be neutral, supplementing into a circulating cooling water tower, and discharging backwash water of the filter into the clarification tank;
D. the waste discharged by the filter is sent into a filter water tank with a filter screen, and the filtered effluent is sent back to a clarification tank;
E. and mixing the particles filtered out by the filter water tank into limestone for desulfurization and recycling the limestone for a desulfurization system.
Further optimizing the technical scheme, wherein the sewage and wastewater in the step A is power plant circulating water sewage or industrial wastewater.
And C, further optimizing the technical scheme, wherein the carbon dioxide in the step A is from the flue gas of a power plant or a carbon dioxide gas cylinder.
And C, further optimizing the technical scheme, wherein the limestone in the step B is limestone with the particle size of 0.2-2 mm.
And further optimizing the technical scheme, a limestone adding pipeline and an alkali adding pipe are arranged on the clarification tank in the step B, the limestone is added into the clarification tank through the limestone adding pipeline in the step B, and the sodium hydroxide is added into the clarification tank through the alkali adding pipe in the step B.
In a further optimized technical scheme, the clarification tank in the step B is a mechanical stirring accelerated clarification tank or a high-density clarification tank or any clarification tank which can ensure that limestone is fluidized and stirred in water.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
According to the method for softening the sewage and the wastewater of the power plant by using the carbon dioxide, provided by the invention, the sewage and the wastewater are fully softened by using the carbon dioxide in the flue gas of the power plant and then recycled, so that the external discharge of the sewage and the water supplement amount of circulating water are reduced on one hand; on the other hand, the carbon emission of the power plant is reduced; meanwhile, the carbon dioxide in the flue gas replaces the originally used sodium carbonate, so that the medicament cost is reduced, and the softening efficiency is improved. According to the invention, small-particle limestone is used as a calcium carbonate scaling core, the limestone gradually grows larger after adsorbing calcium carbonate, and large-particle limestone is reused in a desulfurization system; only sodium hydroxide and limestone are added into the clarification tank, so that the discharged wastewater can be completely recycled into the clarification tank, and the backwashing water of the filter can be completely recycled into the clarification tank; has the advantages of no sludge discharge, no wastewater discharge and low treatment cost.
Detailed Description
A method for softening and treating power plant sewage and wastewater by using carbon dioxide specifically comprises the following steps:
A. injecting the circulating water sewage of the power plant or the industrial wastewater into the raw water tank, introducing carbon dioxide from a flue gas or carbon dioxide gas cylinder of the power plant into the raw water tank, and controlling the pH value of the mixed effluent to be 5.0-7.0.
B. Sending the effluent of the raw water tank into a clarification tank, periodically adding limestone with the particle size of 0.2-2mm through a limestone adding pipeline, then adding sodium hydroxide into the clarification tank through an alkali adding pipe, and controlling the hydroxyl radical of the effluent to reach 0.2-0.5mmol/L; the hardness, calcium ions and alkalinity of inlet water and outlet water of the clarification tank are detected according to periods, so that the removal rate of the calcium ions in the outlet water reaches 50-90%. Wherein, the clarification tank is a mechanical stirring accelerated clarification tank or a high-density clarification tank or any clarification tank which can ensure the fluidization and stirring of limestone in water.
In reaction process, the lime stone is as the crystal nucleus, and the lime stone adsorbs the calcium carbonate grow gradually, and the lime stone of large granule can subside to the depositing reservoir bottom, then recycles large granule lime stone to desulfurization system again, has realized that no mud is arranged outward.
C. Introducing the effluent of the clarification tank into a filter for filtering, adding sulfuric acid into the filtered effluent, adjusting the pH value to be neutral, supplementing into a circulating cooling water tower, and discharging the backwashing water of the filter into the clarification tank.
D. The waste discharged by the filter is sent to a filter tank with a filter screen, and the filtered effluent is sent back to the clarification tank. The filter adopts a variable pore filter or a multi-medium filter or any filter which can ensure that the turbidity of the effluent is below 5NTU.
E. And mixing the particles filtered out by the filter water tank into limestone for desulfurization and recycling the limestone for a desulfurization system.
The present invention will be described in further detail with reference to specific embodiments.
Example 1:
a method for softening treatment of power plant sewage and wastewater by using carbon dioxide specifically comprises the following steps:
A. the water amount is 300m 3 Injecting the sewage/h into a raw water pool, introducing power plant flue gas into the raw water pool, and adjusting the pH value of the sewage/h to 7.0 by utilizing carbon dioxide in the flue gas.
B. Then the sewage and wastewater are sent into a mechanical stirring accelerated clarification tank, 2 mechanical stirring accelerated clarification tanks are selected for the mechanical stirring accelerated clarification tank, and the output of the single mechanical stirring accelerated clarification tank is controlled to be 150m 3 And h, ensuring that the retention time of the sewage and the wastewater in the mechanical stirring accelerated clarification tank reaches 2 hours. Limestone particles with the excessive particle size of 0.5-1.0mm are added through a limestone adding pipeline in a hydraulic conveying mode, and sodium hydroxide is added through an alkali adding pipe for softening until the concentration of hydroxyl in water is 0.4mmol/L.
C. Introducing the effluent obtained in the step B, the calcium ion concentration of which is reduced to 0.4mmol/L, into a variable pore filter for filtering, wherein the output of the single variable pore filter is 300m 3 H, effluent turbidity less than 5NTU. Then adding sulfuric acid to adjust the pH value to 7.2, and supplementing the effluent into a circulating cooling water tower through a pipeline, wherein the concentration ratio of the circulating water is 5 times.
D. The waste discharged by the variable pore filter is firstly sent into a filter water tank with a filter screen, the effluent water filtered by the filter screen is recycled into a clarification tank, and the backwashing water of the variable pore filter is also recycled into the clarification tank.
E. The particles filtered out from the filter water tank are conveyed to a power plant desulfurization system through a dump truck, the particles are mixed into limestone for desulfurization, and the limestone slurry is prepared and reused in the desulfurization system after being crushed by a limestone powder preparation system.
Example 2:
a method for softening treatment of power plant sewage and wastewater by using carbon dioxide specifically comprises the following steps:
A. the water amount is 300m 3 Injecting the sewage/h into a raw water pool, introducing power plant flue gas into the raw water pool, and adjusting the pH value of the sewage/h to 6.0 by utilizing carbon dioxide in the flue gas.
B. The sewage and wastewater are sent into a high-density clarification tank, 2 high-density clarification tanks are selected for the high-density clarification tank, and the retention time of the sewage and wastewater in the high-density clarification tank is ensured to reach 2 hours. Limestone particles with the excessive particle size of 0.5-1.0mm are added through a limestone adding pipeline in a hydraulic conveying mode, and sodium hydroxide is added through an alkali adding pipe for softening until the concentration of hydroxyl in water is 0.2mmol/L.
C. Introducing the effluent water obtained in the step B and reducing the calcium ions to 0.2mmol/L into a multi-media filter for filtering, wherein the design output of the single multi-media filter is 300m 3 The turbidity of the effluent is less than 5NTU. Then adding sulfuric acid to adjust the pH value to 7.2, and supplementing the effluent into a circulating cooling water tower through a pipeline, wherein the concentration ratio of the circulating water is 5 times.
D. The waste discharged by the multi-media filter is firstly sent into a filter water tank with a filter screen, the effluent water filtered by the filter screen is recycled into a clarification tank, and the back washing water of the multi-media filter is also recycled into the clarification tank.
E. The particles filtered out from the filter water tank are conveyed to a power plant desulfurization system through a dump truck, the particles are mixed into limestone for desulfurization, and the limestone slurry is prepared and reused in the desulfurization system after being crushed by a limestone powder preparation system.
Example 3:
a method for softening and treating power plant sewage and wastewater by using carbon dioxide specifically comprises the following steps:
A. the water amount is 300m 3 Injecting the sewage/h into a raw water pool, introducing power plant flue gas into the raw water pool, and adjusting the pH value of the sewage/h to 5.0 by utilizing carbon dioxide in the flue gas.
B. The sewage and wastewater are sent into a high-density clarification tank, 2 high-density clarification tanks are selected for the high-density clarification tank, and the retention time of the sewage and wastewater in the high-density clarification tank is ensured to reach 2 hours. Limestone particles with the excessive particle size of 0.5-1.0mm are added through a limestone adding pipeline in a hydraulic conveying mode, and sodium hydroxide is added through an alkali adding pipe for softening until the concentration of hydroxyl in water is 0.5mmol/L.
C. Introducing the effluent water obtained in the step B and reducing the calcium ions to 0.5mmol/L into a multi-media filter for filtering, wherein the design output of the single multi-media filter is 300m 3 H, effluent turbidity less than 5NTU. Then adding sulfuric acid to adjust the pH value to 7.0, supplementing the effluent into a circulating cooling water tower through a pipeline, and circulatingThe water concentration ratio is 5 times.
D. The waste discharged by the multi-media filter is firstly sent into a filter water tank with a filter screen, the effluent water filtered by the filter screen is recycled into the clarification tank, and the backwashing water of the multi-media filter is also recycled into the clarification tank.
E. The particles filtered out from the filter water tank are conveyed to a power plant desulfurization system through a tip lorry, the particles are mixed into limestone for desulfurization, and the limestone is prepared into limestone slurry for reuse in the desulfurization system after being crushed by a limestone powder preparation system.
After the sewage and wastewater of the power plant are treated by the method, the purposes of reducing the external discharge amount of the sewage and wastewater, reducing the carbon emission amount and softening treatment cost and preventing a softening treatment system from discharging sludge and wastewater are achieved, the labor capacity is reduced, and the production cost is also reduced.
Claims (6)
1. A method for softening and treating sewage and wastewater of a power plant by using carbon dioxide is characterized by comprising the following steps:
A. injecting the sewage and the wastewater into a raw water pool, introducing carbon dioxide into the raw water pool, and controlling the pH value of the mixed effluent to be 5.0-7.0;
B. sending the effluent of the raw water tank into a clarification tank, adding limestone periodically, then adding sodium hydroxide into the clarification tank, and controlling the hydroxyl radical of the effluent to reach 0.2-0.5mmol/L; detecting the hardness, calcium ions and alkalinity of inlet water and outlet water of the clarification tank according to periods to ensure that the removal rate of the calcium ions in the outlet water reaches 50-90 percent;
C. introducing the effluent of the clarification tank into a filter for filtering, adding sulfuric acid into the filtered effluent, adjusting the pH value to be neutral, supplementing into a circulating cooling water tower, and discharging backwash water of the filter into the clarification tank;
D. the waste discharged by the filter is sent into a filter water tank with a filter screen, and the filtered effluent is sent back to a clarification tank;
E. and mixing the particles filtered out by the filter water tank into limestone for desulfurization and recycling the limestone for a desulfurization system.
2. The method for softening and treating the power plant sewage and wastewater by using the carbon dioxide as claimed in claim 1, is characterized in that: and the sewage and wastewater in the step A is circulating water sewage of a power plant or industrial wastewater.
3. The method for softening and treating the power plant sewage and wastewater by using the carbon dioxide as claimed in claim 1, is characterized in that: and B, the carbon dioxide in the step A is from power plant flue gas or a carbon dioxide gas cylinder.
4. The method for softening and treating the power plant sewage and wastewater by using the carbon dioxide as claimed in claim 1, is characterized in that: and the limestone in the step B is limestone with the particle size of 0.2-2 mm.
5. The method for softening and treating the power plant sewage and wastewater by using the carbon dioxide as claimed in claim 1, is characterized in that: and a limestone adding pipeline and an alkali adding pipe are arranged on the clarification tank in the step B, limestone is added into the clarification tank through the limestone adding pipeline in the step B, and sodium hydroxide is added into the clarification tank through the alkali adding pipe in the step B.
6. The method for softening and treating the power plant sewage and wastewater by using the carbon dioxide as claimed in claim 5, is characterized in that: the clarification tank in the step B is a mechanical stirring accelerated clarification tank or a high-density clarification tank or any clarification tank which can ensure the fluidization and stirring of limestone in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733733.0A CN115321701A (en) | 2022-06-27 | 2022-06-27 | Method for softening treatment of power plant sewage and wastewater by using carbon dioxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210733733.0A CN115321701A (en) | 2022-06-27 | 2022-06-27 | Method for softening treatment of power plant sewage and wastewater by using carbon dioxide |
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| CN115321701A true CN115321701A (en) | 2022-11-11 |
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| CN202210733733.0A Pending CN115321701A (en) | 2022-06-27 | 2022-06-27 | Method for softening treatment of power plant sewage and wastewater by using carbon dioxide |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011462A (en) * | 2012-12-31 | 2013-04-03 | 河南华润电力首阳山有限公司 | Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant |
| CN106430780A (en) * | 2016-11-02 | 2017-02-22 | 华润电力（菏泽）有限公司 | Heat-engine plant wastewater treatment method and system |
| CN106882893A (en) * | 2017-04-13 | 2017-06-23 | 盛发环保科技（厦门）有限公司 | A kind of carbon dioxide recycle in utilization flue gas softens method for waste water and device |
| CN111362460A (en) * | 2020-03-23 | 2020-07-03 | 河北冀研能源科学技术研究院有限公司 | Efficient recycling treatment method for reclaimed water of thermal power plant |
-
2022
- 2022-06-27 CN CN202210733733.0A patent/CN115321701A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011462A (en) * | 2012-12-31 | 2013-04-03 | 河南华润电力首阳山有限公司 | Device and method for treating waste residues of circulating make-up water by reutilizing lime softening method of power plant |
| CN106430780A (en) * | 2016-11-02 | 2017-02-22 | 华润电力（菏泽）有限公司 | Heat-engine plant wastewater treatment method and system |
| CN106882893A (en) * | 2017-04-13 | 2017-06-23 | 盛发环保科技（厦门）有限公司 | A kind of carbon dioxide recycle in utilization flue gas softens method for waste water and device |
| CN111362460A (en) * | 2020-03-23 | 2020-07-03 | 河北冀研能源科学技术研究院有限公司 | Efficient recycling treatment method for reclaimed water of thermal power plant |
Non-Patent Citations (1)
| Title |
|---|
| 许佩瑶主编: "火电厂应用化学", vol. 1, 中国电力出版社, pages: 182 - 183 * |
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