CN114751540A - Shale gas fracturing flow-back fluid waste water decrement integrates processing system - Google Patents
Shale gas fracturing flow-back fluid waste water decrement integrates processing system Download PDFInfo
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- CN114751540A CN114751540A CN202111548220.4A CN202111548220A CN114751540A CN 114751540 A CN114751540 A CN 114751540A CN 202111548220 A CN202111548220 A CN 202111548220A CN 114751540 A CN114751540 A CN 114751540A
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention discloses a shale gas fracturing flowback fluid wastewater reduction and integration treatment system which comprises an air flotation device, a high-efficiency sedimentation tank, an aluminosilicate sand filter, an STRO high-pressure device, a secondary reverse osmosis device, a membrane system matched cleaning device and a filter matched cleaning device. The shale gas flowback liquid after pretreatment such as suspended matter removal, softening, oil removal and the like enters an aluminate sand filter in the system, and the produced water enters an STRO high-pressure device; the water produced by the high-pressure device enters a secondary reverse osmosis device, and the concentrated water of the high-pressure device is collected and then subjected to uniform decrement treatment; the quality of the water produced by the secondary reverse osmosis device reaches the standard of the outsider, and the concentrated water flows back to the front end of the STRO device. The invention monitors and adjusts the fluctuation concentration of the stock solution of the advanced treatment system, has simple flow, ensures the treatment effect of the flow-back liquid, reduces the operation cost of the flow-back liquid treatment system, adopts container type complete equipment, is convenient to install and has strong site adaptability.
Description
Technical Field
The invention relates to a shale gas fracturing flowback fluid wastewater reduction and integration treatment system, and belongs to the technical field of environment-friendly water treatment.
Background
Shale gas is unconventional natural gas, mainly contains methane, and is a novel and clean energy source. With the continuous deepening of the development process of the conventional oil and gas fields, the recoverable reserves of oil and gas in the world decline year by year, and the shale gas becomes one of important energy source replacing sources. In the process of shale gas development and yield increase, a reservoir containing shale gas is usually reformed by using a hydraulic fracturing measure, and fracturing fluid is returned to the ground after fracturing operation is finished to form fracturing flow-back fluid. Shale gas fracturing flowback fluid contains a large amount of complex components such as organic matters, soluble salts, various additives and the like, and carries a large amount of pollutants such as sludge, suspended matters, oil and the like. Along with the progress of the fracturing process, the quality of the fracturing flow-back fluid can also fluctuate greatly. If the sewage is not effectively treated, the sewage is directly reinjected or discharged, so that the serious waste of water resources is caused, meanwhile, the damage is brought to the surrounding environment of the shale gas well, the pollution is caused to the surrounding shallow underground water and surface water system, and the human health is further influenced.
The conventional treatment process of the fracturing flow-back fluid at present is to pretreat oil, suspended matters and hardness, then enter a membrane system for reduction treatment of wastewater, and adopt a vehicle to transport single ore points to a pointing site for centralized treatment after respective collection. The method aims at the situation of the industry, and often has the problems that when the quality of the raw liquid of the fracturing flow-back fluid fluctuates greatly, the membrane system subjected to advanced treatment often generates pollution blockage, the pressure of a high-pressure pump system rises sharply, the quality of produced water is deteriorated, and the service life of the membrane is directly shortened in serious cases. In addition, the transportation cost of the waste water is high, and the waste water is lost and pollutes the environment along the transportation.
The invention aims to buffer the working condition of the deterioration of the quality of the stock solution by intelligently adjusting an internal system, effectively ensure the quality of produced water and the protection of membrane elements and reduce the operation and maintenance cost.
Disclosure of Invention
The invention aims to provide a shale gas fracturing flowback fluid wastewater reduction and integration treatment system. The shale gas flowback liquid treatment effect is guaranteed, the operation cost of the flowback liquid treatment system is reduced, and the container type complete equipment is adopted, so that the installation is convenient and fast, and the site adaptability is strong.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the utility model provides a shale atmospheric pressure splits and returns flowing back waste water decrement integration processing system, includes air supporting device, high-efficient sedimentation tank, aluminosilicate sand filter, STRO high pressure device, second grade reverse osmosis unit, the supporting belt cleaning device of membrane system, the supporting belt cleaning device of filter. Shale gas returns flowing back liquid through the supporting belt cleaning device of this system aluminosilicate sand filter, STRO high-pressure device, second grade reverse osmosis unit and relevant membrane system, the supporting belt cleaning device of filter after deoiling, removing suspended solid and hardness to through monitoring, the regulation design is finally realized returning the decrement of flowing back and the water production discharge up to standard to the fluctuating concentration of advanced treatment system stoste, and adopt container formula complete sets, it is convenient to install, and the place adaptability is strong.
Furthermore, the air floatation device can remove oil and suspended matters, and has high hydraulic load and compact pool body.
Furthermore, the high-efficiency sedimentation tank integrates coagulation, flocculation, clarification and sludge concentration, pipe channel connection is not needed, a direct connection mode is adopted for tight connection, the occupied area is small, the head loss is small, and the system efficiency is high.
Furthermore, the aluminosilicate sand filter is filled with aluminosilicate sand to realize the capacity of electrostatically adsorbing heavy metals and organic molecules, and has a self-purification function.
Further, the STRO high-pressure device comprises a STRO feed pump, a STRO cartridge filter, a STRO high-pressure pump, and a STRO device; before entering the STRO device, the filter produced water should be added with acid for pH adjustment, and added with scale inhibitor for preventing hardness scaling. In addition, reducing agent is added for preventing the membrane from being oxidized, and non-oxidizing agent is added for preventing the organic and microbial pollution of the membrane; the recovery rate of the STRO device can reach 80 percent.
Furthermore, the secondary reverse osmosis device comprises a secondary reverse osmosis water supply pump, a secondary reverse osmosis cartridge filter, a secondary reverse osmosis high-pressure pump and a secondary reverse osmosis device, and the quality of produced water is improved to meet the requirement of discharged water quality by adjusting the pH value of the wastewater to remove dissolved CO2 in the water; the recovery rate of the second-stage reverse osmosis can reach 85 percent.
Furthermore, the design of monitoring and adjusting the stock solution fluctuation concentration of the advanced treatment system is that water quality monitoring instruments are respectively arranged at the water inlet end and the water production end of the STRO high-pressure device and the secondary reverse osmosis device; when the quality of the shale gas flowback liquid stock solution is seriously deteriorated, the system can collect data and analyze the data in time and take measures through related program control steps, so that the final discharged water quality is effectively prevented from being deteriorated, the pollution, blockage and damage risks of the membrane are effectively reduced, and the service life of the membrane is prolonged.
Furthermore, the program control step sequence is to adopt a backflow part of the STRO device to produce water to the front end of the STRO water supply pump by analyzing the water quality deterioration degree of the shale gas flowback drainage liquid so as to stabilize the fluctuation of the water quality. When the water quality is worse, the return secondary reverse osmosis water can be used to feed the water to the front end of the STRO feed pump. The return water amount of the system and the design of related return pipelines, valves and instruments need to be calculated through a large amount of early-stage previewing and determined by combining engineering experience;
furthermore, container formula complete sets indicates through the rational design to the device appearance, arrange, pipeline design, finally realizes container formula equipment that integrates. Aiming at the problem that the occupied area of a part of shale gas flowback liquid construction sites is short, the system device has higher flexibility and is installed quickly. Wherein the design hydraulic load of air supporting device, high-efficient sedimentation tank is high, and each unit in the device is through rational design, under the condition of guaranteeing the treatment effect, very big reduction takes up an area of the space. The equipment adopts complete steel equipment, and is convenient to place and install.
The technical effect of the high-concentration wastewater advanced treatment system is as follows:
(1) the advanced treatment system can effectively ensure the decrement of shale gas flowback liquid and the standard discharge of produced water by configuring an air flotation device, a high-efficiency sedimentation tank, an aluminosilicate sand filter, a STRO high-pressure device, a secondary reverse osmosis device and a cleaning device matched with a relevant membrane system and a cleaning device matched with a filter.
(2) By monitoring the fluctuation concentration of the stock solution of the advanced treatment system, the system can collect data and analyze the data in time and take measures through related program control steps, thereby effectively preventing the final discharged water quality from deteriorating, effectively reducing the pollution, blockage and damage risks of the membrane and prolonging the service life of the membrane.
(3) Through designing container formula complete sets, can realize that single ore deposit disposes equipment, handles waste water on the spot, need not the long-distance transportation waste water, causes the pollution. In addition, the container type complete equipment has the obvious advantages of small occupied area, short construction period, convenience in installation and the like.
Drawings
FIG. 1 is a process flow diagram of a shale gas fracturing flowback fluid wastewater reduction and integration treatment system disclosed by the invention;
fig. 2 is a layout diagram of an integrated shale gas fracturing flow-back wastewater reduction treatment system, wherein (a) is a front view, (b) is a top view, and (c) is a left view.
Detailed Description
In the invention, the shale gas flowback liquid is treated by an air floatation and high-efficiency sedimentation tank, then passes through an aluminosilicate sand filter, an STRO high-pressure device, a secondary reverse osmosis device, a cleaning device matched with a relevant membrane system and a cleaning device matched with the filter, and finally realizes the decrement of the flowback liquid and the standard discharge of produced water by monitoring and adjusting the fluctuation concentration of the stock solution of the advanced treatment system.
The air floating device adopts dissolved air floating, pressurizes and aerates all or part of water to be treated (or treated), increases the air dissolving amount of the water, releases the water under normal pressure, separates out air to form small bubbles, adheres to impurity flocs, causes the integral density of the flocs to be lower than that of the water and rises, thereby separating solid from liquid.
The high-efficiency sedimentation tank consists of a condensation zone, a reinforced flocculation zone and a sedimentation zone, wherein the sedimentation zone is divided into a sludge concentration zone and an inclined tube clarification zone. The high-efficiency sedimentation tank integrates flocculation reaction, sedimentation and concentration functions and is matched with a sludge internal circulation system.
The filtering flow rate of the aluminosilicate sand filter can reach 50m/h, the filler cleaning and pollutant separation and discharge are automatically completed in the operation process of equipment, and the water consumption in the whole process is only 1/5 of the similar equipment; and the quality of the effluent is ensured by adopting a secondary filtration mode.
The STRO high-pressure device comprises a STRO feed pump, a STRO cartridge filter, a STRO high-pressure pump and a STRO device; before entering the STRO device, the filter produced water should be added with acid for pH adjustment, and added with scale inhibitor for preventing hardness scaling. Usually, the pH is adjusted to about 7, and the adding amount of the scale inhibitor is about 3-5 mg/l. In addition, reducing agent is added to prevent the membrane from being oxidized, and the adding amount is about 3-5 mg/l. In order to prevent organic and microbial pollution of the membrane, a non-oxidizing medicament is added in an impact manner, and the adding amount is about 50-100 mg/l; the lift of the high-pressure pump reaches about 11MPa, and the recovery rate of the STRO device can reach 80 percent.
The secondary reverse osmosis device comprises a secondary reverse osmosis feed pump, a secondary reverse osmosis cartridge filter, a secondary reverse osmosis high-pressure pump and a secondary reverse osmosis device, and the quality of produced water is improved to meet the requirement of discharged water quality by adjusting CO2 dissolved in the discharged water of the pH value of the wastewater; usually, the pH value is adjusted to about 8.3, the high-pressure pump lift reaches about 2MPa, and the secondary reverse osmosis recovery rate can reach 85%.
The design of monitoring and adjusting the stock solution fluctuation concentration of the advanced treatment system is that water quality monitoring instruments are respectively arranged at the water inlet end and the water production end of the STRO high-pressure device and the secondary reverse osmosis device; when the quality of the stock solution of the shale gas flowback liquid is seriously deteriorated (when the total salt content of the stock solution exceeds 20000 mg/L), the system can collect data and analyze the data in time and take measures through related program control steps, so that the final discharged water quality is effectively prevented from being deteriorated, the pollution, blockage and damage risks of the membrane are effectively reduced, and the service life of the membrane is prolonged.
The program control step sequence refers to that the fluctuation of the water quality is stabilized by analyzing the water quality deterioration degree of the shale gas flowback liquid (when the total salt content of the stock solution is 20000-30000 mg/L) and refluxing 30-50% of the water produced by the STRO device to the front end of the STRO feed pump. When the water quality is worse (when the total salt content of the stock solution is 30000-40000 mg/L), the return secondary reverse osmosis water can be adopted to flow to the front end of the STRO feed pump.
By designing the shapes of the membrane system sliding frame and the non-standard tank body, the system can be supplied in a container form; the STRO security filter, STRO high pressure pump and STRO device are mounted on the same sliding frame through reasonable design to form a complete set device, then loaded into the container, and other supporting facilities are arranged in the container.
The embodiment discloses a high-concentration wastewater deep treatment method, which comprises the following technical scheme:
the shale gas flowback liquid enters a first air flotation device, the processing capacity of a single air flotation device is 12-15 m3/h, and the air flotation device is steel complete supply equipment and is about 6.0m multiplied by 2.5m in size.
The water produced by the air flotation device flows to a water inlet area of a high-efficiency sedimentation tank automatically through a high potential difference, and is subjected to flocculation, coagulation, calcium hydroxide and sodium carbonate hardness removal, and then the produced water is collected by an intermediate water tank and is pumped to an aluminosilicate sand filter. The high-efficiency sedimentation tank device is steel complete supply equipment, and the floor space is about 3.6m multiplied by 5.6 m; the flocculated and precipitated sludge is pumped into the container by a sludge pump
The sludge dewatering machine carries out decrement dewatering treatment, the filter pressing liquid flows back to the front end, and the sludge is sent to
The sludge storage tank is used for storing and transporting.
The wastewater enters an aluminosilicate sand filter with the diameter of 1200mm, and is placed in a container. The filtering flow rate of the filter can reach 50m/h, and the quality of the effluent is ensured by adopting a two-stage filtering mode in the running process of the equipment. The project is provided with two filters in total, and the single filter is used for treating water with the amount of 10m 3/h. The filter is backwashed by adopting produced water, and is matched with a backwashed water pump and used for standby. Removing part of heavy metals and organic substances through a filter. The water produced by the filter enters a water tank of the filter and is pumped to a STRO device in the container. Adjusting the pH value of the water inlet of the STRO device to about 7 by adding acid, and adding 3-5mg/l of scale inhibitor, reducing agent and 50-100mg/l of non-oxidizing agent. The water produced by the filter enters a STRO water supply pump, the water outlet pressure of the water pump is 0.3MPa, the water enters a STRO security filter and a high pressure pump of the [ ro ], the lift of the high pressure pump reaches about 11MPa, and the water is pumped out by the high pressure pump and enters a [ ro ] STRO device; the recovery rate of the STRO device can reach 80 percent, the water yield is 8.3m3/h, and the salt content is about 750 mg/l. The STRO sliding rack is reasonably arranged through the module pipeline, the internal space of the sliding rack is compact and reasonable, and the sliding rack occupies about 2.1m multiplied by 6.9 m.
The STRO produced water is sent to the ninthly STRO produced water tank, after the pH value is adjusted to about 8.3, the STRO produced water is pressurized and sent to the ninthly reverse osmosis cartridge filter by a secondary reverse osmosis water supply pump,
A second-stage reverse osmosis high-pressure pump, the lift of the high-pressure pump reaches about 2MPa, and the outlet water of the high-pressure pump is delivered to
The secondary reverse osmosis device has the secondary reverse osmosis recovery rate of 85 percent, the water yield of about 7m3/h and the salt content of about 50mg/l, and meets the local wastewater discharge standard. The second stage reverse osmosis produced water is sent to
And (5) storing in a reverse osmosis water production tank. The pretreatment system dosing device, the membrane system dosing device and the membrane system matching cleaning device are all in a complete set of sliding frame mode and are spliced in a container on site.
In view of the embodiments of the present invention, those skilled in the art should, unless otherwise explicitly limited or specified, consider the above embodiments to describe, explain and guide the treatment processes involved in the present invention, and not to be taken in a limiting sense, nor to be limited to the above-mentioned embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made to the present embodiment without departing from the scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a shale atmospheric pressure splits and returns flowing back waste water decrement integration processing system which characterized in that, includes air supporting device, high-efficient sedimentation tank, aluminosilicate sand filter, STRO high pressure device, second grade reverse osmosis unit, the supporting belt cleaning device of membrane system, the supporting belt cleaning device of filter.
2. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system as claimed in claim 1, wherein the air flotation device is used for removing oil, suspended matters and hardness.
3. The shale gas fracturing flow-back wastewater reduction and integration treatment system of claim 1, wherein the efficient sedimentation tank integrates coagulation, flocculation, clarification and sludge concentration, is not connected by a pipe and is tightly connected in a straight-through manner.
4. The shale gas fracturing flowback liquid wastewater reduction and integration treatment system of claim 1, wherein the aluminosilicate sand filter is filled with aluminosilicate sand to achieve the capacity of electrostatically adsorbing heavy metals and organic molecules, and has a self-purification function.
5. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system of claim 1, wherein the STRO high-pressure device comprises a STRO feed pump, a STRO cartridge filter, a STRO high-pressure pump, and a STRO device; before entering the STRO device, the filter produced water is added with acid for pH adjustment, and added with a scale inhibitor for preventing hardness scaling; in addition, reducing agent is added for preventing the membrane from being oxidized, and non-oxidizing agent is added for preventing the organic and microbial pollution of the membrane; the recovery rate of the STRO device can reach 80 percent.
6. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system as claimed in claim 1, wherein the secondary reverse osmosis device comprises a secondary reverse osmosis feed pump, a secondary reverse osmosis cartridge filter, a secondary reverse osmosis high-pressure pump and a secondary reverse osmosis device, and the quality of produced water is improved to meet the requirement of discharged water quality by adjusting the pH value of wastewater to remove dissolved CO2 in water.
7. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system of claim 1, wherein the water inlet end and the water production end of the STRO high-pressure device and the secondary reverse osmosis device are respectively provided with a water quality monitoring instrument.
8. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system as claimed in claim 5, wherein the water quality fluctuation is stabilized by analyzing the water quality deterioration degree of the shale gas flow-back fluid and adopting the water produced by the STRO device of the backflow part to the front end of the STRO water supply pump; when the water quality is worse, the water produced by the two-stage reverse osmosis can be returned to the front end of the STRO feed pump.
9. The shale gas fracturing flow-back fluid wastewater reduction and integration treatment system of claim 1, wherein the system is a container type complete equipment.
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