CN114804404A - Harmless treatment method for roasting wet electric asphalt-containing tar washing water - Google Patents
Harmless treatment method for roasting wet electric asphalt-containing tar washing water Download PDFInfo
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- CN114804404A CN114804404A CN202210282582.1A CN202210282582A CN114804404A CN 114804404 A CN114804404 A CN 114804404A CN 202210282582 A CN202210282582 A CN 202210282582A CN 114804404 A CN114804404 A CN 114804404A
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- water
- wet electric
- asphalt
- calcined coke
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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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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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
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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
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a harmless treatment method for roasting wet electric washing water containing asphalt tar, which comprises the following steps: s1: storing wet electric cleaning water with pH value of 5 and containing asphalt tar into a buffer water tank; s2: pumping wet electric cleaning water in the buffer water tank into a water distributor by using a first water pump, and conveying the wet electric cleaning water into a composite filter through the water distributor; s3: adsorbing asphalt tar in the wet electric cleaning water through calcined coke in the composite filter, and enabling the filtered wet electric cleaning water to flow into a clean water tank; s4: conveying the calcined coke adsorbed with the asphalt tar to a calcining workshop for burdening and calcining to produce qualified calcined coke; s5: putting qualified calcined coke into system production; s6: carrying out acid-base neutralization reaction on the wet electric cleaning water in the clean water tank to enable the pH value of the filtered wet electric cleaning water in the clean water tank to reach 7-7.5, so as to obtain qualified water; s7: qualified water is used for wet electric washing. The invention can realize harmless treatment and secondary effective utilization of the asphalt-containing tar wastewater.
Description
Technical Field
The invention relates to a method for treating wet electric washing water, in particular to a method for harmlessly treating roasting wet electric asphalt-containing tar washing water.
Background
A4-level flue gas treatment process comprising a washing settling tower, an electric tar precipitator, limestone gypsum desulfurization and a wet electric dust precipitator is adopted for flue gas purification and desulfurization in a roasting workshop in the pre-roasted anode production system for aluminum. At present, a roasting desulfurization and wet electric system has large water consumption and less consumption, and wet electric washing water contains a small amount of asphalt tar, has weak acidity of about 5 PH and cannot be recycled for a long time. The original design is used for roasting wet electricity, washing water is used for one to two times every day, the washing water amount is about 20t each time, the water after the wet electricity washing is precipitated through a sedimentation tank, and is treated by a desulfurization system wastewater treatment system and is used for circularly washing the wet electricity. Because of the water that the wet electricity of calcination washed contains pitch tar, this part pitch tar is dissolved in water, and the pitch tar of desulfurization effluent disposal system unable filtration aquatic, the unable effectual reutilization of the washing water of wet electricity, the unable outward discharge of waste water is handled yet.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides a harmless treatment method of roasting wet electric asphalt-containing tar washing water, which can realize the harmless treatment of asphalt-containing tar wastewater.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a harmless treatment method for roasting wet electric asphalt-containing tar washing water comprises the following steps:
s1: firstly, storing wet electric cleaning water with pH value of 5 and containing asphalt tar into a buffer water tank;
s2: pumping the wet electric cleaning water in the buffer water tank into a water distributor by using a first water pump, and uniformly conveying the wet electric cleaning water into a composite filter by using the water distributor;
s3: adsorbing asphalt tar in the wet electric cleaning water through calcined coke in the composite filter, wherein the filtered wet electric cleaning water with the pH value of 5 flows into a clean water tank;
s4: conveying the calcined coke adsorbed with the asphalt tar to a calcining workshop for batching and calcining to produce qualified calcined coke for production;
s5: putting qualified calcined coke into system production;
s6: adding a corresponding amount of sodium hydroxide into the filtered wet electric cleaning water in the clean water tank according to the PH value requirement of the required water quality, and performing acid-base neutralization reaction to ensure that the PH value of the filtered wet electric cleaning water in the clean water tank reaches 7-7.5, so that the wet electric cleaning water becomes qualified water for wet electric washing, which can be effectively recycled;
s7: and the qualified water after acid-base neutralization is introduced into a circulating water tank, a second water pump is arranged in the circulating water tank, and the qualified water is used for wet electric washing by utilizing the second water pump.
Five layers are sequentially arranged in the composite filter from top to bottom, the first layer is calcined coke for adsorbing the asphalt tar, the thickness of the calcined coke is 500-1000mm, and the granularity is 2-6 mm; the second layer is sponge for filtering and isolating the calcined coke and preventing calcined coke particles from entering the lower layer, and the sponge is not less than 8mm in thickness; the third layer is a first plastic filter cap used for supporting the calcined coke of the first layer and the sponge of the second layer; the fourth layer is quartz sand for re-filtering fine particles, the setting thickness of the quartz sand is 500-800mm, and the granularity is 1-4 mm; the fifth layer is a second plastic filter cap for supporting the quartz sand on the fourth layer.
The composite filter is an open filter, and the water distributor is arranged above the composite filter through a support.
Before the sodium hydroxide is added into the clean water tank, the sodium hydroxide needs to be dissolved and prepared in an alkali dissolving tank, and a saturated sodium hydroxide solution is prepared in the alkali dissolving tank.
When the saturated sodium hydroxide solution is added into the clear water tank for pH value adjustment, the sodium hydroxide solution is added through a micro dosing pump, and the pH value in the clear water tank is continuously detected, so that the pH value is ensured to reach 7-7.5.
The invention has the following positive beneficial effects:
the invention adopts a physical filtration method, uses calcined coke with large void degree and strong adsorption capacity as a filter material to adsorb asphalt tar in water, returns the calcined coke after adsorbing the asphalt tar to a calcination workshop for batching calcination to produce qualified calcined coke for system production, thereby realizing harmless treatment of the asphalt tar-containing wastewater; and the water conservancy that the pH value after filtering is 5 becomes the qualified water that can effectual reutilization after the neutralization of alkali (sodium hydroxide) neutralization method, is convenient for cyclic utilization, resources are saved.
Drawings
FIG. 1 is a process flow diagram of a harmless treatment method of roasting wet electric tar-containing washing water.
Detailed Description
An embodiment of the invention will be described in more detail below with reference to fig. 1. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to".
It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
The names of messages or information exchanged between devices in the embodiments of the present invention are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
Example (b): a harmless treatment method for roasting wet electric asphalt-containing tar washing water comprises the following steps:
s1: the wet electric cleaning water with pH 5 and asphalt tar is stored in a buffer water tank.
The buffer pool is specially used for storing wet electric cleaning water containing asphalt tar, a first water pump is arranged in the buffer pool, a water pumping pipe is connected to the first water pump, and the other end of the water pumping pipe is connected with the water distributor.
S2: wet electric cleaning water in the buffer water tank is pumped into the water distributor by the first water pump, and the wet electric cleaning water is conveyed into the composite filter by the water distributor.
The composite filter is an open filter, the water distributor is arranged above the composite filter through a support, the support is arranged on the ground or other platforms, and the wet electric cleaning water in the buffer water tank is uniformly sprayed in the composite filter through the water suction pipe by using the water distributor as long as the support can be fixed.
S3: five layers are sequentially arranged in the composite filter from top to bottom, the first layer is calcined coke for adsorbing asphalt tar, the thickness of the calcined coke is 500-1000mm, and the granularity is 2-6 mm; the second layer is sponge for filtering and isolating calcined coke and preventing calcined coke particles from entering the lower layer, and the thickness of the sponge is not less than 8 mm; the third layer is a first plastic filter cap used for supporting the calcined coke of the first layer and the sponge of the second layer; the fourth layer is quartz sand for re-filtering fine particles, the setting thickness of the quartz sand is 500-800mm, and the granularity is 1-4 mm; the fifth layer is a second plastic filter cap for supporting the quartz sand on the fourth layer.
The PH value is 5, the wet electric cleaning water containing asphalt tar flows in from the top of the composite filter, the asphalt tar is adsorbed by the calcined coke of the first layer, the remaining wet electric cleaning water without asphalt tar passes through the sponge of the second layer, the first plastic filter cap of the third layer, the quartz sand of the fourth layer and the second plastic filter cap of the fifth layer, and the wet electric cleaning water with the PH value of 5 flows into the clean water tank through the water outlet of the composite filter.
The water outlet of the composite filter is provided with a water diversion hose, wet electric cleaning water with the pH value of 5 flows into the clean water pool through the water diversion hose, and the clean water pool is specially used for containing the wet electric cleaning water with the pH value of 5 and containing no asphalt tar.
S4: after the composite filter is used for filtering, the calcined coke which is adsorbed with the asphalt tar in the first layer is taken out, the calcined coke containing the asphalt tar is transported to a calcination workshop by a transport vehicle for batching calcination, and the calcined coke is calcined into qualified calcined coke for production in the calcination workshop.
The blending is the blending between the calcined coke containing the asphalt tar and the petroleum coke for calcination, and the proportion of the calcined coke containing the asphalt tar in the feed of the petroleum coke for calcination is not more than 5%.
S5: then putting the qualified calcined coke into system production, thereby realizing the harmless treatment of the asphalt-containing tar wastewater;
s6: the pH value of the wet electric cleaning water in the middle clear water tank is 5, the wet electric cleaning water does not contain asphalt tar, the next procedure can be carried out only by carrying out acid-base neutralization reaction, sodium hydroxide with a corresponding amount is added into the filtered wet electric cleaning water in the clear water tank according to the pH value requirement of the required water quality, the acid-base neutralization reaction is carried out, the pH value of the filtered wet electric cleaning water in the clear water tank reaches 7-7.5, and the wet electric cleaning water becomes qualified water for wet electric washing, which can be effectively recycled;
before the sodium hydroxide is added into the clean water tank, the sodium hydroxide needs to be dissolved and prepared in an alkali dissolving tank, and a saturated sodium hydroxide solution is prepared in the alkali dissolving tank.
When the saturated sodium hydroxide solution is added into the clear water tank for pH value adjustment, the sodium hydroxide solution is added through a micro dosing pump, and the pH value in the clear water tank is continuously detected, so that the pH value is ensured to reach 7-7.5.
S7: qualified water after acid-base neutralization is introduced into a circulating water tank, a second water pump is arranged in the circulating water tank, a water pumping pipe is arranged on the second water pump, and the qualified water is used for wet electric washing by the second water pump through the water pumping pipe, so that effective secondary utilization of the wet electric washing water is realized.
The calcined coke is used as a filter material to adsorb asphalt tar in water, and the calcined coke after adsorbing the asphalt tar is returned to a calcination workshop to be subjected to batching calcination to produce qualified calcined coke for system production, so that the harmless treatment of the asphalt tar-containing wastewater is realized; and the water conservancy after the weak acidity is filtered becomes qualified water which can be effectively recycled after being neutralized by an alkali neutralization method, so that the recycling is convenient, and the resources are saved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. A harmless treatment method for roasting wet electric asphalt-containing tar washing water is characterized by comprising the following steps:
s1: firstly, storing wet electric cleaning water with pH value of 5 and containing asphalt tar into a buffer water tank;
s2: pumping the wet and electric washing water in the buffer water tank into a water distributor by using a first water pump, and uniformly conveying the wet and electric washing water into a composite filter through the water distributor;
s3: adsorbing asphalt tar in the wet electric cleaning water through calcined coke in the composite filter, and enabling the filtered wet electric cleaning water with the pH value of 5 to flow into a clean water tank;
s4: conveying the calcined coke adsorbed with the asphalt tar to a calcining workshop for batching and calcining to produce qualified calcined coke for production;
s5: putting qualified calcined coke into system production;
s6: adding a corresponding amount of sodium hydroxide into the filtered wet electric cleaning water in the clean water tank according to the PH value requirement of the required water quality, and performing acid-base neutralization reaction to ensure that the PH value of the filtered wet electric cleaning water in the clean water tank reaches 7-7.5, so that the wet electric cleaning water becomes qualified water for wet electric washing, which can be effectively recycled;
s7: and the qualified water after acid-base neutralization is introduced into a circulating water tank, a second water pump is arranged in the circulating water tank, and the qualified water is used for wet electric washing by utilizing the second water pump.
2. The harmless treatment method of the roasting wet electric asphalt-containing tar washing water as claimed in claim 1, which is characterized in that: five layers are sequentially arranged in the composite filter from top to bottom, the first layer is calcined coke for adsorbing the asphalt tar, the thickness of the calcined coke is 500-1000mm, and the granularity is 2-6 mm; the second layer is sponge for filtering and isolating the calcined coke and preventing calcined coke particles from entering the lower layer, and the sponge is not less than 8mm in thickness; the third layer is a first plastic filter cap used for supporting the calcined coke of the first layer and the sponge of the second layer; the fourth layer is quartz sand for re-filtering fine particles, the setting thickness of the quartz sand is 500-800mm, and the granularity is 1-4 mm; the fifth layer is a second plastic filter cap for supporting the quartz sand on the fourth layer.
3. The harmless treatment method of the roasted wet electric asphalt-containing tar washing water as claimed in claim 2, which is characterized in that: the composite filter is an open filter, and the water distributor is arranged above the composite filter through a support.
4. The harmless treatment method of the roasting wet electric asphalt-containing tar washing water as claimed in claim 3, which is characterized in that: before sodium hydroxide is added into the clean water tank, the sodium hydroxide needs to be dissolved and prepared in an alkali dissolving tank, and a saturated sodium hydroxide solution is prepared in the alkali dissolving tank.
5. The harmless treatment method of the roasting wet electric asphalt-containing tar washing water as claimed in claim 4, which is characterized in that: when the saturated sodium hydroxide solution is added into the clear water tank for pH value adjustment, the sodium hydroxide solution is added through a micro dosing pump, and the pH value in the clear water tank is continuously detected, so that the pH value is ensured to reach 7-7.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210282582.1A CN114804404A (en) | 2022-03-22 | 2022-03-22 | Harmless treatment method for roasting wet electric asphalt-containing tar washing water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210282582.1A CN114804404A (en) | 2022-03-22 | 2022-03-22 | Harmless treatment method for roasting wet electric asphalt-containing tar washing water |
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| CN114804404A true CN114804404A (en) | 2022-07-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198273A (en) * | 1976-07-28 | 1980-04-15 | Wintershall Aktiengesellschaft | Apparatus for producing petroleum coke calcinate |
| US5149447A (en) * | 1991-05-23 | 1992-09-22 | Allied-Signal Inc. | Creosote filtration system with a shell and tube type filtration device |
| CN101784337A (en) * | 2007-07-27 | 2010-07-21 | 新日本石油株式会社 | Method of regenerating carbonaceous oil adsorbent |
| CN109678295A (en) * | 2019-01-09 | 2019-04-26 | 青岛科信新能源技术有限公司 | A kind of environment-friendly type method for treating tar-containing wastewater |
| CN210261355U (en) * | 2019-04-03 | 2020-04-07 | 四川启明星铝业有限责任公司 | Roasting flue gas wet purification sewage on-site treatment system |
| CN111545003A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method for purifying tar in carbon electrode roasting furnace flue gas |
| CN113697995A (en) * | 2021-09-01 | 2021-11-26 | 龙游秦明环保科技有限公司 | Production system and production method of high polymer modified asphalt waterproof coating |
-
2022
- 2022-03-22 CN CN202210282582.1A patent/CN114804404A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198273A (en) * | 1976-07-28 | 1980-04-15 | Wintershall Aktiengesellschaft | Apparatus for producing petroleum coke calcinate |
| US5149447A (en) * | 1991-05-23 | 1992-09-22 | Allied-Signal Inc. | Creosote filtration system with a shell and tube type filtration device |
| CN101784337A (en) * | 2007-07-27 | 2010-07-21 | 新日本石油株式会社 | Method of regenerating carbonaceous oil adsorbent |
| CN109678295A (en) * | 2019-01-09 | 2019-04-26 | 青岛科信新能源技术有限公司 | A kind of environment-friendly type method for treating tar-containing wastewater |
| CN210261355U (en) * | 2019-04-03 | 2020-04-07 | 四川启明星铝业有限责任公司 | Roasting flue gas wet purification sewage on-site treatment system |
| CN111545003A (en) * | 2020-05-20 | 2020-08-18 | 山东大学 | Method for purifying tar in carbon electrode roasting furnace flue gas |
| CN113697995A (en) * | 2021-09-01 | 2021-11-26 | 龙游秦明环保科技有限公司 | Production system and production method of high polymer modified asphalt waterproof coating |
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