CN111115923A - Oily sewage treatment system and method based on electric flocculation technology - Google Patents

Oily sewage treatment system and method based on electric flocculation technology Download PDF

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Publication number
CN111115923A
CN111115923A CN202010022336.3A CN202010022336A CN111115923A CN 111115923 A CN111115923 A CN 111115923A CN 202010022336 A CN202010022336 A CN 202010022336A CN 111115923 A CN111115923 A CN 111115923A
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China
Prior art keywords
oily sewage
electrode plates
electric flocculation
tank
sewage treatment
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CN202010022336.3A
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Chinese (zh)
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范维旺
张天泽
李一言
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Beijing Baowo Petroleum Technology Co ltd
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Beijing Baowo Petroleum Technology Co ltd
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Priority to CN202010022336.3A priority Critical patent/CN111115923A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/465Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses an oily sewage treatment system and method based on an electrocoagulation technology, wherein the system comprises a sewage tank, oily sewage is contained in the sewage tank, the sewage tank is connected with the lower part of an electrocoagulation device through a liquid inlet pipe, the upper part of the electrocoagulation device is connected with the lower part of a settling tank through a liquid discharge pipe, the upper part of the settling tank is provided with a liquid outlet pipe, the electrocoagulation device comprises a reaction tank, a plurality of electrode plates which are distributed at intervals are arranged in the reaction tank, and the electrode plates are electrically connected with a direct-current power supply. The system has the advantages that the reaction tank is close to the settling tank, and a split design is adopted, so that the occupied area is small, and the treatment efficiency is high; the space between the electrode plates is reasonably designed, so that the settling motion of a flocculating body and the floating motion of bubbles can be accelerated; the electrode plates can be connected together through the connecting piece, so that the replacement operation of the power connection device and the electrode plates is simplified, and the working efficiency is improved.

Description

Oily sewage treatment system and method based on electric flocculation technology
Technical Field
The invention relates to the technical field of oily sewage treatment systems, in particular to an oily sewage treatment system and method based on an electric flocculation technology.
Background
At present, most oil fields in China enter the middle stage or the later stage of exploitation, along with the change of the exploitation mode of the oil fields, the water content in the produced oil is continuously increased, and some water is even more than 90 percent.
The conventional oily sewage treatment methods have the problems of high energy consumption, high investment cost, complex equipment, difficult maintenance and the like. Therefore, research and development of new high-efficiency, energy-saving and economic technologies are urgently needed in the field of oily sewage treatment. The electric flocculation technology has strong decontamination capability, simple and convenient operation, high automation degree, no need of adding chemical agents, good economy and high environmental compatibility, and is a high-efficiency, economic and environment-friendly sewage treatment method. With the implementation of the environmental protection strategy in China, the technology is more and more emphasized. The process of removing pollutants by the electrocoagulation technology is complex, and the reaction mechanism of the electrocoagulation technology comprises the following functions of (1) air flotation. During the electrolysis, gas in the form of micro bubbles is generated and is adhered to and lifted to the water surface together with pollutants such as emulsion, colloid and the like in the raw water to be removed. The bubbles generated by the electric flocculation are much smaller than those generated by the pressurized air floatation, so that the air floatation capability is strong and the pollutant removal effect is good. (2) Flocculation. The metal cations generated by the sacrificial anode are hydrolyzed and polymerized in water to generate a series of multi-core hydrolysis products, the nascent state hydroxides have high activity and strong adsorption capacity, are good flocculating agents, are combined with colloids, suspended matters, soluble pollutants, bacteria, viruses and the like in raw water to generate large floccules, and are removed by precipitation and air flotation. The process is similar to the mechanism of chemical flocculation, and comprises the processes of charge neutralization, electric double layer compression, adsorption bridging and the like. (3) Oxidation-reduction. Under the action of the current, some organic matters in the raw water are oxidized into lower molecular organic matters, and even some organic matters are oxidized into CO2 and H2O. Meanwhile, the nascent hydrogen generated by the cathode has strong reducing capability and is subjected to reduction reaction with pollutants in the wastewater, so that the pollutants are degraded. In the actual water treatment process, the above mechanisms are often combined or interacted, or the mechanism is more obvious and dominant in different reaction stages, specific water quality conditions and operation environments.
The reaction tank and the sedimentation tank of the existing oily sewage treatment system adopt an integrated design, so that the occupied area of equipment is large, the sedimentation separation time is long, the treatment efficiency is not high, the structure is complex, and the operation is inconvenient; and the polar plates are all a single body, so that the problems of high polar plate replacement cost and the like exist.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides an oily sewage treatment system based on an electrocoagulation technology, wherein a reaction tank and a settling tank are closely adjacent and adopt a split design, so that the occupied area is small, and the treatment efficiency is high; the space between the electrode plates is reasonably designed, which is beneficial to accelerating the sedimentation motion of flocculating constituents and the floating motion of bubbles; the electrode plates can be connected together through the connecting piece, so that the replacement operation of the power connection device and the electrode plates is simplified, and the working efficiency is improved.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
the utility model provides an oily sewage treatment system based on electric flocculation technique, includes the effluent water sump, the splendid attire has oily sewage in the effluent water sump, the effluent water sump passes through feed liquor union coupling electric flocculation device's lower part, the lower part of fluid-discharge tube connection settling cask is passed through on electric flocculation device's upper portion, the upper portion of settling cask is provided with the drain pipe, electric flocculation device includes the reaction tank, be provided with a plurality of plate electrodes that the interval was arranged in the reaction tank, the plate electrode electricity is connected with DC power supply.
Furthermore, flow pumps are arranged on the liquid inlet pipe and the liquid discharge pipe.
Further, the distance between two adjacent electrode plates is 1.8 cm.
Further, a plurality of the electrode plates are fixedly connected together through a non-conductive connecting piece.
Further, the electrode plate is an aluminum electrode plate.
The invention also provides an oily sewage treatment method based on the electric flocculation technology, which comprises the following steps:
s1, allowing oily sewage to flow out of the sewage tank and then flow into an electric flocculation device through a liquid inlet pipe, wherein the electric flocculation device comprises a reaction tank, a plurality of electrode plates which are arranged at intervals are arranged in the reaction tank, and the electrode plates are electrically connected with a direct-current power supply;
s2 electrolyzing the oily sewage by the electrode plate under the control of the direct current power supply to separate oil from water in the oily sewage into water reaching the standard, a flocculating constituent and air flotation foam, wherein the air flotation foam and a part of the flocculating constituent are left in the reaction tank, and the water reaching the standard and the other part of the flocculating constituent flow into a settling tank through a drainage pipe;
s3, the settling tank is used for settling the flocculating constituent in the settling tank and discharging the water reaching the standard in the settling tank to the outside through a liquid outlet pipe.
Further, in S1, the flow rate of the oily sewage in the liquid inlet pipe is monitored and regulated by a flow pump.
Further, in S2, the dc power supply influences the oil-water separation effect of the oily sewage by controlling the current density of the aluminum plate.
Further, the distance between two adjacent electrode plates is 1.8 cm.
Further, a plurality of the electrode plates are fixedly connected together through a non-conductive connecting piece.
The invention has the beneficial effects that: the system has the advantages that the reaction tank is close to the settling tank, and a split design is adopted, so that the occupied area is small, and the treatment efficiency is high; the space between the electrode plates is reasonably designed, so that the settling motion of a flocculating body and the floating motion of bubbles can be accelerated; the electrode plates can be connected together through the connecting piece, so that the replacement operation of the power connection device and the electrode plates is simplified, the working efficiency is improved, and a large amount of manpower, material resources and financial resources are saved; the liquid outlet pipe is arranged at the upper part of the settling tank, so that the water reaching the standard has sufficient time to be separated from floccules before being discharged; the system can remove harmful pollutants such as crude oil, suspended matters, bacteria, chromaticity, heavy metal ions, BOD, COD and the like in the oily sewage at one time, is a high-efficiency, economic and environment-friendly treatment device, and is beneficial to short-flow transformation of an oilfield sewage treatment process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of an oily sewage treatment system based on an electric flocculation technology according to an embodiment of the present invention.
In the figure:
1. oily sewage; 2. a liquid inlet pipe; 3. a flow pump; 4. an electrode plate; 5. an electrocoagulation device; 6. a direct current power supply; 7. a settling tank; 8. a liquid outlet pipe.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1, the oily sewage treatment system based on the electrocoagulation technology according to the embodiment of the present invention includes a sewage tank, wherein oily sewage 1 is contained in the sewage tank, the sewage tank is connected to the lower portion of an electrocoagulation device 5 through a liquid inlet pipe 2, the upper portion of the electrocoagulation device 5 is connected to the lower portion of a settling tank 7 through a liquid outlet pipe, the upper portion of the settling tank 7 is provided with a liquid outlet pipe 8, the electrocoagulation device 5 includes a reaction tank, a plurality of electrode plates 4 are arranged at intervals in the reaction tank, and the electrode plates 4 are electrically connected to a dc power supply 6.
In a specific embodiment of the present invention, flow pumps 3 are disposed on both the liquid inlet pipe 2 and the liquid outlet pipe.
In one embodiment of the present invention, the distance between two adjacent electrode plates 4 is 1.8 cm.
In one embodiment of the present invention, a plurality of the electrode plates 4 are fixedly connected together by a non-conductive connecting member.
In one embodiment of the present invention, the electrode plate 4 is an aluminum electrode plate.
The invention also provides an oily sewage treatment method based on the electric flocculation technology, which comprises the following steps:
s1, enabling the oily sewage 1 to flow out of the sewage tank and then flow into an electric flocculation device 5 through a liquid inlet pipe 2, wherein the electric flocculation device 5 comprises a reaction tank, a plurality of electrode plates 4 which are arranged at intervals are arranged in the reaction tank, and the electrode plates 4 are electrically connected with a direct-current power supply 6;
s2, electrolyzing the oily sewage 1 by the electrode plate 4 under the control of the direct current power supply 6 to separate oil from water in the oily sewage 1 into water reaching the standard, a flocculating constituent and air flotation foam, wherein the air flotation foam and a part of the flocculating constituent are left in a reaction tank, and the water reaching the standard and the other part of the flocculating constituent flow into a settling tank 7 through a drain pipe;
s3, the settling tank 7 settles the flocculating constituent in the settling tank and discharges the water reaching the standard in the settling tank to the outside through a liquid outlet pipe 8.
In a specific embodiment of the present invention, in S1, the flow rate of the oily sewage 1 in the liquid inlet pipe 2 is monitored and adjusted by the flow pump 3.
In an embodiment of the present invention, in S2, the dc power supply 6 controls the current density of the aluminum plate 4 to influence the oil-water separation effect of the oily sewage 1.
In one embodiment of the present invention, the distance between two adjacent electrode plates 4 is 1.8 cm.
In one embodiment of the present invention, a plurality of the electrode plates 4 are fixedly connected together by a non-conductive connecting member.
In order to facilitate understanding of the above-described embodiments of the present invention, the following detailed description of the embodiments of the present invention is provided by way of specific usage.
The oily sewage treatment system based on the electric flocculation technology comprises a sewage pool, a liquid inlet pipe 2, a flow pump 3, an electric flocculation device 5, a settling tank 7 and a liquid outlet pipe 8.
The sewage tank is used for containing oily sewage 1.
The electrocoagulation device 5 is used for carrying out oil-water separation on oily sewage 1, the electrocoagulation device 5 comprises a reaction tank, a direct current power supply 6 and a plurality of electrode plates 4, the electrode plates 4 are divided into anode plates and cathode plates, the anode plates and the cathode plates are aluminum electrode plates, the distance between the anode plates and the cathode plates is 1.8cm, the plurality of electrode plates 4 adopt a modular design, concretely, the anode plates and the cathode plates are arranged at intervals and then are fixedly connected together through non-conductive connecting pieces (such as plastics), the anode plates and the cathode plates are respectively connected with a connecting copper sheet, the connecting copper sheets of all the anode plates are connected on a copper bar, the connecting copper sheets of all the cathode plates are connected on another copper bar, then the modular electrode plates 4 are installed in the reaction tank, and the copper bars are connected with an electric connection device in the reaction tank, so that all the anode plates are connected, all cathode plates are connected with the negative pole of the direct current power supply 6. Through setting up the effectual electric installation that connects that has simplified of copper bar, the whole change of a plurality of plate electrodes 4 can be realized through the modular design of plate electrode 4 simultaneously, and this is than traditional change that carries out the plate electrode one by one will save time to the operation degree of difficulty has been reduced. The electric flocculation device 5 can effectively treat oily sewage, and has small occupied area and very simple operation because the integrated sedimentation tank is removed.
The flow rate in the inlet pipe 2 and the flow rate in the discharge pipe can be monitored and regulated by the flow pump 3.
The direct current power supply 6 can influence the treatment effect of the oily sewage 1 by directly controlling the current density of the electrode plate 4.
The settling tank 7 is used for settling flocculating constituents generated by electrolysis, and then discharging the water reaching the standard to the outside through a liquid outlet pipe 8.
During the specific use, oily sewage 1 flows to electric flocculation device 5 through feed liquor pipe 2 after flowing out from the effluent water sump, and carry out oil-water separation under the electrolytic action of plate electrode 4, a part of flocculating constituent and air supporting foam remain in the reaction tank after oil-water separation, remaining sewage (being the mixture of water up to standard and another part flocculating constituent) flows to settling cask 7 through the drain pipe in, the flocculating constituent in the sewage deposits to the lower part of settling cask 7, and remaining water up to standard flows to the external world through setting up drain pipe 8 on settling cask 7 upper portion, the velocity of flow of oily sewage 1 is controlled by flow pump 3, the electrolytic voltage of plate electrode 4 is controlled by DC power supply 6, thereby can realize the timely effective processing of oily sewage, and the protection of ecological environment.
In conclusion, by means of the technical scheme, the reaction tank and the settling tank are close to each other and adopt a split design, so that the system is small in occupied area and high in treatment efficiency; the space between the electrode plates is reasonably designed, so that the settling motion of a flocculating body and the floating motion of bubbles can be accelerated; the electrode plates can be connected together through the connecting piece, so that the replacement operation of the power connection device and the electrode plates is simplified, the working efficiency is improved, and a large amount of manpower, material resources and financial resources are saved; the liquid outlet pipe is arranged at the upper part of the settling tank, so that the water reaching the standard has sufficient time to be separated from floccules before being discharged; the system can remove harmful pollutants such as crude oil, suspended matters, bacteria, chromaticity, heavy metal ions, BOD, COD and the like in the oily sewage at one time, is a high-efficiency, economic and environment-friendly treatment device, and is beneficial to short-flow transformation of an oilfield sewage treatment process.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides an oily sewage treatment system based on electroflocculation technique, includes the effluent water sump, splendid attire has oily sewage (1) in the effluent water sump, a serial communication port, the effluent water sump passes through the lower part that feed liquor pipe (2) connected electroflocculation device (5), the lower part of fluid-discharge tube connection settling cask (7) is passed through on the upper portion of electroflocculation device (5), the upper portion of settling cask (7) is provided with drain pipe (8), electroflocculation device (5) are including the reaction tank, be provided with a plurality of plate electrodes (4) that the interval was arranged in the reaction tank, plate electrode (4) electricity is connected with DC power supply (6).
2. The oily sewage treatment system based on the electric flocculation technology of claim 1, wherein flow pumps (3) are arranged on the liquid inlet pipe (2) and the liquid outlet pipe.
3. An oily water treatment system based on an electric flocculation technology according to claim 1, wherein the distance between two adjacent electrode plates (4) is 1.8 cm.
4. An oily sewage treatment system based on the electric flocculation technology according to claim 1, wherein a plurality of the electrode plates (4) are fixedly connected together by a non-conductive connecting piece.
5. An oily sewage treatment system based on the electric flocculation technology of claim 1, wherein the electrode plate (4) is an aluminum electrode plate.
6. An oily sewage treatment method based on an electric flocculation technology is characterized by comprising the following steps:
s1 oily sewage (1) flows out of the sewage tank and then flows into an electric flocculation device (5) through a liquid inlet pipe (2), the electric flocculation device (5) comprises a reaction tank, a plurality of electrode plates (4) which are arranged at intervals are arranged in the reaction tank, and the electrode plates (4) are electrically connected with a direct-current power supply (6);
s2 electrolyzing the oily sewage (1) by the electrode plate (4) under the control of the direct current power supply (6) to separate oil from water in the oily sewage (1) into water reaching the standard, a flocculating constituent and air flotation foam, wherein the air flotation foam and a part of the flocculating constituent are left in a reaction tank, and the water reaching the standard and the other part of the flocculating constituent flow into a settling tank (7) through a drain pipe;
s3 the settling tank (7) settles the flocculating constituent in the settling tank and discharges the standard-reaching water in the settling tank to the outside through a liquid outlet pipe (8).
7. The method for treating oily sewage based on electroflocculation technique according to claim 6, wherein the flow rate of the oily sewage (1) in the liquid inlet pipe (2) is monitored and regulated by a flow pump (3) at S1.
8. The oily sewage treatment method based on the electric flocculation technique of claim 6, wherein in S2, the DC power supply (6) controls the current density of the aluminum plate (4) to influence the oil-water separation effect of the oily sewage (1).
9. The oily sewage treatment method based on the electric flocculation technology of claim 6, wherein the distance between two adjacent electrode plates (4) is 1.8 cm.
10. The oily sewage treatment method based on the electric flocculation technology of claim 6, wherein a plurality of the electrode plates (4) are fixedly connected together through a non-conductive connecting piece.
CN202010022336.3A 2020-01-09 2020-01-09 Oily sewage treatment system and method based on electric flocculation technology Pending CN111115923A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113072219A (en) * 2021-03-26 2021-07-06 江西清绿环保有限公司 High-efficiency treatment system for restaurant wastewater
CN113233543A (en) * 2021-05-26 2021-08-10 大连海事大学 Micro-scale oil drop separation device and method for oily sewage of ship

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113072219A (en) * 2021-03-26 2021-07-06 江西清绿环保有限公司 High-efficiency treatment system for restaurant wastewater
CN113233543A (en) * 2021-05-26 2021-08-10 大连海事大学 Micro-scale oil drop separation device and method for oily sewage of ship

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Application publication date: 20200508