CN108439642B - High-efficiency gas field water high-concentration mercury removal system and method - Google Patents
High-efficiency gas field water high-concentration mercury removal system and method Download PDFInfo
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- CN108439642B CN108439642B CN201810336993.8A CN201810336993A CN108439642B CN 108439642 B CN108439642 B CN 108439642B CN 201810336993 A CN201810336993 A CN 201810336993A CN 108439642 B CN108439642 B CN 108439642B
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F2101/20—Heavy metals or heavy metal compounds
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Abstract
The invention discloses a high-efficiency removal system and a high-efficiency removal method for high-concentration mercury in gas field water. The invention adopts the high-efficiency mercury catching agent and the auxiliary agent for mercury removal, can effectively remove mercury in various forms, and ensures that the effluent stably reaches the standard; the invention adopts two-stage regenerable mercury adsorption materials, has targeting property to mercury, is efficient and quick, avoids the pollution of other organic substances, has large saturated adsorption capacity and can be regenerated and used on line; and fourthly, the monitoring water tank is adopted to enter the regulating water tank in an overflow mode, when an accident occurs in the front-end process, the sewage of the whole system is ensured not to leak, and meanwhile, the treated water is ensured to reach the standard stably.
Description
Technical Field
The invention relates to a high-concentration mercury-containing sewage treatment process in gas field water, in particular to a high-concentration mercury efficient removal system and a high-concentration mercury-containing sewage treatment method in a high-mercury-containing gas field.
Background
At present, the process for removing high-concentration mercury from gas field water mainly comprises sulfide reaction, flocculation precipitation and activated carbon adsorption. The existing demercuration treatment process of gas field water mainly comprises coagulation sedimentation and activated carbon adsorption, and because the concentration of chloride ions in the gas field water is more than 1000mg/L, mercury ions and chloride ions in the water generate stable dissolved complexes which are uncharged and difficult to be adsorbed when being dissolved in the water, the existing process has low removal rate of organic mercury, incomplete removal of soluble mercury, difficulty in ensuring that the total mercury of the treated gas field water is less than 0.05mg/L, high CODcr of the gas field water, easy saturation of activated carbon and poor selective adsorption capability of mercury.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-efficiency gas field water mercury removal system and a method, which have the advantages of low investment, small occupied area, stable effluent quality, convenient management and operation, complete automation control and complete solution of the problem of high-concentration mercury pollution of gas field water.
The technical scheme adopted by the invention is as follows: a high-efficiency removal system for high-concentration mercury in gas field water comprises a regulating water tank, a closed combined air flotation device, an integrated high-concentration mercury-containing sewage treatment device, a two-stage adsorption demercuration tower and a monitoring water tank which are sequentially connected, wherein the two-stage adsorption demercuration tower is connected with a regenerated water tank, and the regenerated water tank is connected with the integrated high-concentration mercury-containing sewage treatment device; be provided with electric valve between regulation water pitcher and the guardianship water pitcher all install PH detector, TDS detector and level gauge in regulation water pitcher and the guardianship water pitcher, electric valve, PH detector, TDS detector and level gauge all link to each other with PLC control system.
The invention also provides a high-efficiency removal method of high-concentration mercury in gas field water, which comprises the following steps:
step one, mixing and homogenizing mercury-containing gas field sewage in a regulating water tank, and then pretreating in a closed combined air floatation device;
secondly, the sewage pretreated by the closed combined air floatation device enters an integrated high-concentration mercury-containing sewage treatment device, and mercury in various forms is removed by adopting a high-efficiency mercury capture agent and an auxiliary agent for demercuration;
and step three, carrying out deep demercuration treatment in a two-stage adsorption demercuration tower to ensure that the final effluent stably reaches the standard.
Compared with the prior art, the invention has the following positive effects:
firstly, the processing device in the process adopts a highly integrated design, so that the occupied area is reduced, the management is convenient, and the labor intensity of workers is reduced; secondly, the high-efficiency mercury capture agent and the auxiliary agent are adopted for mercury removal, so that various forms of mercury can be effectively removed, especially dissolved mercury which forms a complex with chloride ions, and the effluent is guaranteed to stably reach the standard; thirdly, two-stage regenerable mercury adsorption materials are adopted, so that the mercury is targeted, efficient and rapid, pollution of other organic substances is avoided, the saturated adsorption capacity is large, and online regeneration and use can be realized; and fourthly, the monitoring water tank is adopted to enter the regulating water tank in an overflow mode, when an accident occurs in the front-end process, the sewage of the whole system is ensured not to leak, and meanwhile, the treated water is ensured to reach the standard stably.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
A high-efficiency removal system for high-concentration mercury in gas field water, as shown in fig. 1, comprising: adjust water pitcher 1, first elevator pump 2, PLC control system 3, electric valve 4, regeneration water tank 5, guardianship water pitcher 6, gaseous purifier 7, airtight combination air supporting device 8, integration high concentration mercury-containing sewage treatment plant 9, second elevator pump 10, one-level absorption demercuration tower 11, second grade absorption demercuration tower 12 and online instrument, 13 to 23 are the pipeline in the picture, wherein:
the high-mercury-containing sewage of a gas field is connected with an adjusting water tank 1 through a pipeline 13, the adjusting water tank 1 is connected with a first lifting pump 2 through a pipeline 14, the first lifting pump 2 is connected with a closed combined air floating device 8 through a pipeline 14, the closed combined air floating device 8 is connected with an integrated high-concentration mercury-containing sewage treatment device 9 through a pipeline 15, the closed combined air floating device 8 and the integrated high-concentration mercury-containing sewage treatment device 9 are connected with a gas purification device 7 through a pipeline 21, the integrated high-concentration mercury-containing sewage treatment device 9 is connected with a second lifting pump 10 through a pipeline 16, the second lifting pump 10 is connected with a first-stage adsorption demercuration tower 11 through a pipeline 16, the first-stage adsorption demercuration tower 11 and a second-stage adsorption demercuration tower 12 are combined devices, the second-stage adsorption demercuration tower 12 is connected with a monitoring water tank 6 through a pipeline 17, the monitoring water tank 6 conveys the treated water reaching the standard to a water using point through a pipeline 18, the airtight combined air flotation device 8 and the integrated high-concentration mercury-containing sewage treatment device 9 convey generated sludge to a centralized treatment position through a pipeline 19, the regeneration water tank 5 is connected with the integrated high-concentration mercury-containing sewage treatment device 9 through a pipeline 22, the primary adsorption demercuration tower 11 and the secondary adsorption demercuration tower 12 are connected with the regeneration water tank 5 through a pipeline 23, and the monitoring water tank 6 is connected with the adjusting water tank 1 through a pipeline 20.
The invention mixes and homogenizes the mercury-containing gas field sewage by the adjusting water tank 1, and then the mixed and homogenized water is passed throughThe first lift pump 2 pumps the combined air flotation device 8 to pretreat and remove partial oil, suspended matters and suspended mercury in the wastewater, and the device adopts high-efficiency airtight air flotation and can effectively collect and concentrate volatilized mercury; the pretreated sewage passes through an integrated high-concentration mercury-containing sewage treatment device 9, various mercury forms in the sewage are oxidized by a demercuration auxiliary agent in a high-efficiency stirring reaction section to destroy the original structure of the mercury forms and convert the mercury forms into Hg1+ or Hg2+ soluble ion mercury, then passing through high-efficiency mercury scavenger and Hg1+ and Hg2+ removing most mercury in the sewage through solid-liquid separation after the soluble ionic mercury generates stable indissolvable state mercury compounds; the outlet water of the integrated high-concentration mercury-containing sewage treatment device 9 is pumped into a first-stage adsorption tower 11 and a second-stage adsorption tower 12 through a second lift pump 10, large-aperture porous renewable efficient demercuration adsorbent in the two-stage adsorption towers and metal mercury ions in wastewater form coordinate bonds, so that selective adsorption, enrichment and removal of mercury in sewage are realized, deep demercuration treatment is performed, the final outlet water of the process is ensured to reach the standard stably, the adsorption device is used for observing the total mercury index of the outlet water and combining the total adsorption amount after a certain time, when the total mercury index continuously rises, switching regeneration is performed, and the regenerated liquid enters a front-end regulation water tank 1 for retreatment.
Install PH on-line instrument, TDS on-line instrument and level gauge in regulation water pitcher 1 and the guardianship water pitcher 6, and all instruments all link to each other with PLC control system, can directly observe and control through the PLC system. When the monitoring water tank 6 monitors data abnormity, the opening state of the electric valve 4 can be controlled by the PLC system, sewage which does not reach the standard in the monitoring water tank 6 is overflowed to the adjusting water tank 1 through the pipeline 20, and therefore the final effluent is guaranteed to reach the standard stably.
And the pH on-line instrument, the TDS on-line instrument, the liquid level meter and other on-line instruments are subjected to on-site butt joint installation through the installation flanges reserved in the installation ports.
Install PH on-line instrument, TDS on-line instrument, level gauge in adjusting water pitcher 1, install PH on-line instrument, TDS on-line instrument, level gauge at guardianship water pitcher 6, install electric valve 4 on pipeline 20. And each online instrument and each electromechanical device are connected with the PLC control system.
Claims (6)
1. The utility model provides a high-efficient desorption system of gas field water high concentration mercury which characterized in that: including regulation water pitcher, airtight combination air supporting device, integration high concentration mercury-containing sewage treatment plant, two-stage absorption demercuration tower and the guardianship water pitcher that connects gradually, airtight combination air supporting device gets rid of partial oil, suspended solid and the suspension mercury of gas field aquatic, integration high concentration mercury-containing sewage treatment plant carries out the high-efficient stirring reaction section of oxidation including the complex that is used for mercury in the sewage and chloride ion to form, destroys its original structure through the oxidation with various mercury forms in the sewage at high-efficient stirring reaction section through the demercuration auxiliary agent promptly and changes into Hg1+Or Hg2+The soluble ion mercury and a high-efficiency mercury capture solid-liquid separation section for generating the insoluble mercury compound from the soluble ion mercury, namely the soluble ion mercury passes through a high-efficiency mercury capture agent and the Hg1+And Hg2+The method comprises the following steps of (1) generating a stable indissolvable mercury compound by soluble ionic mercury, removing most of mercury in sewage through solid-liquid separation, removing mercury by adopting a high-efficiency mercury capture agent and an auxiliary agent, decomposing complex mercury dissolved in water into common ionic mercury, returning the common ionic mercury to the water again, connecting a two-stage adsorption mercury removal tower with a regeneration water tank, forming coordinate bonds with metal mercury ions in wastewater through a large-aperture porous renewable high-efficiency mercury removal adsorbent in the two-stage adsorption mercury removal tower, and connecting the regeneration water tank with an integrated high-concentration mercury-containing sewage treatment device; be provided with electric valve between regulation water pitcher and the guardianship water pitcher all install PH detector, TDS detector and level gauge in regulation water pitcher and the guardianship water pitcher, electric valve, PH detector, TDS detector and level gauge all link to each other with PLC control system.
2. The system for efficiently removing high-concentration mercury from gas field water according to claim 1, wherein: a lift pump is arranged between the regulating water tank and the closed combined air floatation device.
3. The system for efficiently removing high-concentration mercury from gas field water according to claim 1, wherein: a lift pump is arranged between the integrated high-concentration mercury-containing sewage treatment device and the two-stage adsorption demercuration tower.
4. The system for efficiently removing high-concentration mercury from gas field water according to claim 1, wherein: the closed combined air flotation device and the integrated high-concentration mercury-containing sewage treatment device are connected with the gas purification device.
5. A high-efficiency removal method for high-concentration mercury in gas field water is characterized by comprising the following steps: the method comprises the following steps:
mixing and homogenizing mercury-containing gas field sewage in an adjusting water tank, and then pretreating in a closed combined air floatation device, wherein the pretreatment in the closed combined air floatation device comprises the steps of removing partial oil, suspended matters and suspended mercury in the sewage, and collecting and centralizing the volatilized mercury by adopting closed air floatation;
secondly, the sewage pretreated by the closed combined air flotation device enters an integrated high-concentration mercury-containing sewage treatment device, and a high-efficiency mercury capture agent and an auxiliary agent are adopted for demercuration, so that the complex mercury dissolved in the water is decomposed into common ion mercury and returns to the water again, and thus mercury in various forms is removed;
the method for removing mercury in various forms comprises the following steps: firstly, various mercury forms in the sewage are converted into Hg by a demercuration auxiliary agent in a stirring reaction section of an integrated high-concentration mercury-containing sewage treatment device1+Or Hg2+Of soluble ionic mercury, Hg1+Or Hg2+The soluble state ion mercury reacts with the high-efficiency mercury capture agent to generate a stable indissoluble state mercury compound, and finally solid-liquid separation is carried out to remove most of mercury in the sewage;
performing deep demercuration treatment in a two-stage adsorption demercuration tower to ensure that the final effluent stably reaches the standard; when the total mercury index in the two-stage adsorption demercuration tower continuously rises, switching regeneration is carried out; the regenerated liquid enters the regulating water tank for reprocessing in a monitoring water tank overflow mode.
6. The method for efficiently removing high-concentration mercury from gas field water according to claim 5, wherein the method comprises the following steps: the method for carrying out deep demercuration treatment comprises the following steps: the large-aperture porous reproducible high-efficiency demercuration adsorbent in the two-stage adsorption demercuration tower forms coordinate bonds with metal mercury ions in the wastewater, so that mercury in the wastewater is selectively adsorbed, enriched and removed.
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| CN201810336993.8A CN108439642B (en) | 2018-04-16 | 2018-04-16 | High-efficiency gas field water high-concentration mercury removal system and method |
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| CN113000029B (en) * | 2021-03-01 | 2022-11-25 | 贵州美瑞特环保科技有限公司 | Preparation method of bio-based adsorption filtration fiber membrane for removing and recovering mercury in oil and gas field sewage |
| CN116924622B (en) * | 2023-08-11 | 2024-03-29 | 北京博朗德科技有限公司 | Mercury-containing sewage purifying equipment |
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| FR2668388B1 (en) * | 1990-10-30 | 1994-09-09 | Inst Francais Du Petrole | PROCESS FOR THE PREPARATION OF A SOLID MERCURY CAPTURE MASS. |
| CN102030440A (en) * | 2010-11-30 | 2011-04-27 | 周光毅 | Mercury-polluted water treatment process |
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| CN106830421A (en) * | 2017-01-25 | 2017-06-13 | 内蒙古睿达鑫科技有限责任公司 | The advanced treatment system and method for mercury-containing waste water in vinyl chloride production |
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| CN103771556A (en) * | 2014-01-13 | 2014-05-07 | 陕西师范大学 | Gas field mercury-containing sewage treatment method |
| CN104058553A (en) * | 2014-06-24 | 2014-09-24 | 中国石油集团工程设计有限责任公司 | Treatment process of mercury-containing production waste water from exploitation of natural gas field |
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Effective date of registration: 20210329 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Applicant after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: GUIZHOU MEIRUITE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Applicant before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Applicant before: GUIZHOU MEIRUITE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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