CN111195484B - Surfactant for cleaning plate-type ceramic membrane for oilfield wastewater treatment and cleaning method - Google Patents
Surfactant for cleaning plate-type ceramic membrane for oilfield wastewater treatment and cleaning method Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 211
- 239000000919 ceramic Substances 0.000 title claims abstract description 139
- 238000004140 cleaning Methods 0.000 title claims abstract description 105
- 239000004094 surface-active agent Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 24
- 239000003513 alkali Substances 0.000 claims abstract description 59
- 239000002253 acid Substances 0.000 claims abstract description 55
- 238000011001 backwashing Methods 0.000 claims abstract description 55
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 19
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 19
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 19
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 19
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 9
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract description 23
- 239000002351 wastewater Substances 0.000 abstract description 19
- 239000012459 cleaning agent Substances 0.000 abstract description 9
- 238000013329 compounding Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
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- 230000000737 periodic effect Effects 0.000 abstract 1
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- 231100000719 pollutant Toxicity 0.000 description 10
- 238000005406 washing Methods 0.000 description 10
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- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000004581 coalescence Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
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- 239000000084 colloidal system Substances 0.000 description 2
- 231100001240 inorganic pollutant Toxicity 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/168—Use of other chemical agents
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of oilfield wastewater treatment and recycling, and discloses a surfactant for cleaning a plate-type ceramic membrane for oilfield wastewater treatment and a cleaning method. The cleaning agent comprises a surfactant solution, an acid solution and an alkali solution, wherein the surfactant is prepared by compounding 60-65% of sodium dodecyl benzene sulfonate, 15-20% of sodium tripolyphosphate and 15-25% of octylphenol polyoxyethylene ether in percentage by mass. The acid is nitric acid and the base is sodium hydroxide. The mass concentration of the surfactant solution is 3-3.5%, the acid solution concentration is 0.001-0.002mol/L, and the alkali solution concentration is 0.001-0.002 mol/L. The cleaning mode is divided into real-time cleaning and periodic cleaning. After the plate-type ceramic membrane filter for treating the oil field wastewater is cleaned, the recovery rate of the membrane flux can reach more than 97.5 percent; the backwashing pressure in the backwashing process is only 50% of the conventional backwashing pressure, so that the damage of the plate-type ceramic membrane is effectively avoided, and the backwashing energy consumption is reduced.
Description
Technical Field
The invention belongs to the technical field of oilfield wastewater treatment and recycling, and relates to a surfactant for cleaning a plate-type ceramic membrane for oilfield wastewater treatment and a cleaning method.
Background
The oil field wastewater mainly comprises fracturing wastewater, well washing wastewater, acidizing wastewater and the like, and the wastewater contains pollutants with complex components and stable performance, so that once entering ecological cycle, soil and water resource environment can be polluted. Therefore, how to effectively treat the waste water becomes a problem to be solved urgently in the exploration and development process of each oil field. At present, the main destination of the oil field wastewater is to reinject the stratum, and most of the water quality indexes after treatment meet the relevant requirements of SY/T5329 recommendation indexes and analysis methods for water injection quality of clastic rock reservoirs. For low permeability oil fields, the water treated by the conventional treatment process such as 'coagulating sedimentation, multi-medium filtration' and the like cannot meet the standard requirements.
The ceramic membrane used for treating the oil field wastewater has the advantages of good effluent quality and stable water quality index, and can completely meet the water quality requirement of low permeability reservoir water injection. Therefore, ceramic membrane filters have been used in oil field wastewater treatment in recent years, and are mainly used for controlling indexes such as suspended matter content and particle size in water and petroleum. The plate-type ceramic membrane filter is a novel product appearing in recent years, and has the characteristics of large flux, low energy consumption, pollution resistance, easiness in cleaning and small size compared with a tubular ceramic membrane filter commonly used in oil fields at present.
The analysis of the plate-type ceramic membrane polluted by the oil field wastewater shows that the membrane pollutants mainly contain elements such as C, H, O, Si, Fe, Mg, Ca, Al, Mn, Cr and the like, wherein the content of Fe can reach more than 30 percent, the content of Al is about 5 percent, the content of Ca and Mg is 2 to 5 percent, the content of Si is 2 to 6 percent, and the content of Mn and Cr is 1 to 2 percent. The burning experiment shows that the organic matter content in the pollutants is about 50 percent, and the organic matter content mainly comprises colloid and asphaltene in the crude oil and organic coagulant residues added in the coagulation treatment process; other inorganic elements such as Si, Fe, Mg, Ca, Al, Mn, Cr accumulate on the film surface and in the film pores mainly in the form of colloids or sparingly soluble salts to form scales. According to the analysis of a scanning electron microscope, the membrane pollutants are totally a framework formed by inorganic matters and a compact composite layer filled with the organic matters and tightly combined together, and are attached to the membrane surface and membrane holes near the membrane surface, so that the membrane pollutants have higher structural strength.
Because the plate-type ceramic membrane filtration mode is an external pressure or internal suction type, pollutants are mainly attached to the outer surface of the ceramic membrane, and the conventional cleaning method is mainly acid and alkali internal pressure type backwashing. This method has the following disadvantages:
(1) the cleaning period of the agent of the plate-type ceramic membrane filter is short, generally 3-4 days, and the treatment progress of the oil field wastewater is seriously influenced;
(2) because the oil field wastewater inevitably contains certain petroleum, the cleaning effect of the conventional acid, alkali and surfactant cleaning agent with single component is poor, and the recovery rate of the membrane flux is often less than 80%;
(3) because the intensity of the pollutant layer is higher, higher backwashing pressure is needed in the backwashing process, and the plate-type ceramic membrane is easy to damage;
(4) because most of pollutants are concentrated on the membrane surface, the contact surface of the cleaning solution and the pollutants in the process of permeating from the membrane tube to the membrane surface in the cleaning process is very limited, and a satisfactory cleaning effect is difficult to obtain.
Disclosure of Invention
The invention aims to provide a surfactant and a cleaning method for cleaning a plate-type ceramic membrane for oilfield wastewater treatment, so as to solve the problem of poor cleaning effect in the cleaning of the plate-type ceramic membrane in the prior art.
The invention adopts the following technical scheme:
a cleaning method of a plate-type ceramic membrane for oilfield wastewater treatment comprises the following steps:
in the working process of the plate-type ceramic membrane filter, continuously purging the surface of the plate-type ceramic membrane with gas to prevent insoluble solids from being accumulated on the surface of the plate-type ceramic membrane;
the method for periodically cleaning the plate-type ceramic membrane comprises the following steps:
step 1, cleaning a plate-type ceramic membrane by using a surfactant in a mode of soaking the plate-type ceramic membrane in an internal pressure backwashing combined membrane surface;
and 3, cleaning the plate-type ceramic membrane by using alkali liquor in a mode of soaking the plate-type ceramic membrane in combination with internal pressure backwashing.
In the step 1, a plate-type ceramic membrane is soaked by a surfactant, then the surfactant is injected into the plate-type ceramic membrane for backwashing, and then the surfactant in the plate-type ceramic membrane is emptied.
In the step 1, the soaking time is 30-45min, and the backwashing time is 45-60 min.
And 2, soaking the plate-type ceramic membrane by using acid liquor, injecting the acid liquor into the plate-type ceramic membrane, backwashing, and then emptying the acid liquor in the plate-type ceramic membrane.
In the step 2, the acid liquor is nitric acid solution, the concentration of solute is 0.001-0.002mol/L, the soaking time is 30-45min, and the backwashing time is 45-60 min.
And 3, soaking the plate-type ceramic membrane by using alkali liquor, then injecting alkali liquor into the plate-type ceramic membrane, backwashing, and then emptying the alkali liquor in the plate-type ceramic membrane.
In the step 3, the alkali liquor is sodium hydroxide solution, the concentration of solute is 0.001-0.002mol/L, the soaking time is 30-45min, and the backwashing time is 45-60 min.
In the step 1, the step 2 and the step 3, the pressure is 0.2-0.3 MPa during the internal pressure type backwashing.
The surfactant for cleaning the plate-type ceramic membrane for treating the oil field wastewater comprises solute and solvent, wherein the mass concentration of the solute is 3% -3.5%, the solute comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octyl phenol polyoxyethylene ether, the content of the sodium dodecyl benzene sulfonate is 60% -65%, the content of the sodium tripolyphosphate is 15% -20%, and the balance is the octyl phenol polyoxyethylene ether.
The solvent is water with total hardness less than 1000 mg/L.
The invention has the following beneficial effects:
according to the cleaning method for the plate-type ceramic membrane for treating the oil field wastewater, the surface of the plate-type ceramic membrane is continuously swept by gas in the working process of the plate-type ceramic membrane filter, so that insoluble solids can be prevented from being accumulated on the surface of the plate-type ceramic membrane, and the normal operation period of the plate-type ceramic membrane filter is increased; the regular cleaning of the plate-type ceramic membrane is helpful for the recovery of membrane flux, which is characterized in that: the surfactant cleaning agent has good removal effect on organic pollutants such as crude oil and the like on the membrane surface and in the membrane hole of the plate-type ceramic membrane, so that acid liquor can be in better contact with inorganic pollutants in the next pickling process; the acid washing can remove inorganic pollutants such as metal salt scale and the like on the membrane surface and in the membrane holes; the alkali washing can remove an adsorption layer formed by acid washing; according to the cleaning process, pollutants on the plate-type ceramic membrane can be effectively removed. After the plate-type ceramic membrane filter for treating the oil field wastewater is cleaned, the recovery rate of the membrane flux can reach more than 97.5 percent; the backwashing pressure in the backwashing process is only 50 percent of the conventional backwashing pressure, so that the damage of the plate-type ceramic membrane is effectively avoided, and the backwashing energy consumption is also reduced.
Furthermore, the acid liquor is nitric acid solution, the concentration of solute is 0.001-0.002mol/L, the soaking time is 30-45min, and the backwashing time is 45-60min, so that the metal salt scale on the membrane surface and in the membrane holes can be effectively removed.
Furthermore, the alkali liquor is sodium hydroxide solution, the concentration of solute is 0.001-0.002mol/L, the soaking time is 30-45min, the backwashing time is 45-60min, and the adsorption layer formed by acid washing is effectively removed.
In the surfactant, sodium dodecyl benzene sulfonate has obvious decontamination effect on particle dirt and oily dirt; sodium tripolyphosphate is a complexing agent, can complex high-valence metal ions such as calcium, magnesium and the like, and can achieve satisfactory effect when used in water with high hardness; the octyl phenol polyoxyethylene ether has good emulsifying and cleaning effects. The surfactant compounded by sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octyl phenol polyoxyethylene ether has good removal effect on organic pollutants such as crude oil and the like on the film surface and in the film hole of the plate-type ceramic film, and is beneficial to improving the effects of acid washing and alkali washing in the next step.
Furthermore, the solvent adopts water with the total hardness of less than 1000mg/L, so that the solutes such as surfactant, acid and alkali are fully dissolved.
Drawings
FIG. 1(a) is a schematic diagram of a plate-type ceramic membrane used for oilfield wastewater treatment according to example 1 of the present invention before cleaning;
FIG. 1(b) is a schematic diagram of a plate-type ceramic membrane used for oilfield wastewater treatment according to example 1 of the present invention after cleaning;
FIG. 2(a) is a scanning electron microscope before cleaning the plate-type ceramic membrane for oilfield wastewater treatment according to example 1 of the present invention;
FIG. 2(b) is an electron microscope scanning image of the plate-type ceramic membrane used for oilfield wastewater treatment after being cleaned according to example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The preparation of the agent for cleaning the plate-type ceramic membrane for treating the oilfield wastewater comprises the following steps:
the medicament comprises a surfactant, an acid solution and an alkali solution.
The solute in the surfactant comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octylphenol polyoxyethylene ether, and is prepared by compounding the sodium dodecyl benzene sulfonate, the sodium tripolyphosphate and the octylphenol polyoxyethylene ether; in the solute, by mass percent, the sodium dodecyl benzene sulfonate is 60-65%, the sodium tripolyphosphate is 15-20%, and the octylphenol polyoxyethylene ether is 15-25%. The mass concentration of solute in the surfactant is 3% -3.5%, and the solvent adopts water with the total hardness of less than 1000 mg/L.
The acid solution is nitric acid solution, and the concentration of solute in the acid solution is 0.001-0.002 mol/L; the alkali solution is sodium hydroxide solution, and the concentration of solute in the alkali solution is 0.001-0.002 mol/L.
Cleaning mode of plate-type ceramic membrane for oilfield wastewater treatment
The cleaning mode is divided into gas real-time cleaning and medicament regular cleaning.
The real-time gas cleaning refers to that the plate-type ceramic membrane filter is cleaned at 15-25m in the normal working process3The gas with the flow rate of/min continuously sweeps the plate type ceramic membrane surface, and the phenomenon that insoluble solids are accumulated on the plate type ceramic membrane surface to influence the filtering effect is prevented.
The regular cleaning of the medicament is carried out by adopting a mode of combining internal pressure type backwashing with membrane surface soaking, the cleaning is carried out when the continuous operation is generally carried out for 6-8 days or the membrane flux is reduced to 70% of the initial flux, and the cleaning sequence comprises surfactant cleaning, acid liquor cleaning and alkali liquor cleaning. The method comprises the following specific steps:
cleaning a surfactant, injecting the prepared surfactant into a membrane pool, and soaking for 30-45min if the surfactant is higher than the height of the plate-type ceramic membrane component; and (4) starting a backwashing pump, injecting the prepared surfactant into the plate-type ceramic membrane pipe, backwashing for 45-60min, and emptying the surfactant in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with acid solution, injecting prepared acid solution into the membrane pool, soaking for 30-45min until the membrane pool is submerged in the plate-type ceramic membrane assembly; and (4) starting a backwashing pump, injecting the prepared acid liquor into the plate-type ceramic membrane pipe, backwashing for 45-60min, and discharging the acid liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with alkali liquor, injecting prepared alkali liquor into the membrane pool, soaking for 30-45min until the height of the alkali liquor is higher than that of the plate-type ceramic membrane component; and (4) starting a backwashing pump, injecting the prepared alkali liquor into the plate-type ceramic membrane pipe, backwashing for 45-60min, and emptying the alkali liquor in the membrane tank and the plate-type ceramic membrane pipe.
Example 1
In the oil field wastewater treatment project, oil field wastewater enters a plate-type ceramic membrane filter after being subjected to coalescence oil removal, coagulation precipitation and multi-medium filtration, and filtered water meets the reinjection requirement and is used for water injection development. Plate-type ceramic membrane filter treatment capacity of 20m3As shown in fig. 1(a), after the plate-type ceramic membrane is operated for a period of time, the membrane surface is covered by dirt, the filtration pressure is increased, the membrane flux is reduced, and the membrane flux is reduced to about 70% of the initial flux, so that the membrane flux needs to be cleaned to recover the membrane flux, and the cleaning process is as follows:
1. preparation of cleaning agent
The cleaning agent comprises a surfactant, an acid solution and an alkali solution.
The solute in the surfactant comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octylphenol polyoxyethylene ether, and is prepared by compounding the sodium dodecyl benzene sulfonate, the sodium tripolyphosphate and the octylphenol polyoxyethylene ether; in the solute, by mass percent, 63 percent of sodium dodecyl benzene sulfonate, 18 percent of sodium tripolyphosphate and 19 percent of octylphenol polyoxyethylene ether. The mass concentration of solute in the surfactant is 3.2%, and the solvent adopts water with the total hardness of 900 mg/L.
The acid solution is nitric acid solution, and the concentration of solute in the acid solution is 0.0015 mol/L; the alkali liquor is sodium hydroxide solution, and the concentration of solute in the alkali liquor is 0.0015 mol/L.
2. Cleaning mode
The cleaning mode is divided into gas real-time cleaning and medicament regular cleaning.
Gas is cleaned in real time, and the plate-type ceramic membrane filter is matched with a Roots blower for 20m in the normal working process3The air with the flow rate of/min continuously sweeps the plate-type ceramic membrane surface.
The regular cleaning of the agent is carried out by adopting a mode of combining internal pressure type backwashing with membrane surface soaking, and the cleaning sequence is surfactant cleaning, acid liquor cleaning and alkali liquor cleaning. The method comprises the following specific steps:
washing with a surfactant, namely injecting the prepared surfactant into a membrane pool, and soaking for 35min, wherein the height of the surfactant is suitable for submerging the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.2MPa and 25m3Injecting the prepared surfactant into the plate-type ceramic membrane pipe at the flow rate of/h, backwashing for 50min, and emptying the surfactant in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with acid solution, injecting prepared acid solution into the membrane pool, soaking for 35min until the membrane pool is submerged in the plate-type ceramic membrane assembly; the backwash pump was started at a backwash pressure of 0.2MPa and 25m3Injecting prepared acid liquor into the plate-type ceramic membrane pipe at a flow rate of/h, backwashing for 50min, and emptying the acid liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with alkali liquor, injecting prepared alkali liquor into the membrane pool, soaking for 35min until the height of the alkali liquor is higher than that of the prepared alkali liquor and the height of the alkali liquor is higher than that of the prepared alkali liquor; the backwash pump was started at a backwash pressure of 0.2MPa and 25m3Injecting prepared alkali liquor into the plate-type ceramic membrane pipe at a flow rate of/h, backwashing for 50min, and emptying the alkali liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning effect
The regular cleaning period is increased from the prior 5 days to 7 days, the backwashing pressure is reduced from the previous 0.4MPa to 0.2MPa, the cleaned plate-type ceramic membrane is intact, and the membrane flux is recovered to 98%.
As shown in fig. 1(b), which is a schematic diagram of the plate-type ceramic membrane used for oilfield wastewater treatment after being cleaned in this embodiment, it can be seen that the cleaned plate-type ceramic membrane recovers its natural color.
As can be seen from fig. 2(a), the surface layer of the contaminated plate-type ceramic membrane is covered with dirt, and the membrane pores are filled with contaminants; as can be seen from FIG. 2(b), the surface layer fouling of the membrane surface of the cleaned plate-type ceramic membrane is removed, and the membrane pores are basically recovered.
Example 2
In the oil field wastewater treatment project, oil field wastewater enters a plate-type ceramic membrane filter after being subjected to coalescence oil removal, coagulation precipitation and multi-medium filtration, and filtered water meets the reinjection requirement and is used for water injection development. Plate-type ceramic membrane filter treatment capacity of 20m3After a period of operation, the membrane flux is reduced to about 70% of the initial flux, and the membrane flux needs to be cleaned to recover the membrane flux, wherein the cleaning process is as follows:
1. preparation of cleaning agent
The cleaning agent comprises a surfactant, an acid solution and an alkali solution.
The solute in the surfactant comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octylphenol polyoxyethylene ether, and is prepared by compounding the sodium dodecyl benzene sulfonate, the sodium tripolyphosphate and the octylphenol polyoxyethylene ether; in the solute, by mass percent, the sodium dodecyl benzene sulfonate is 60 percent, the sodium tripolyphosphate is 15 percent, and the octyl phenol polyoxyethylene ether is 15 percent. The mass concentration of solute in the surfactant is 3%, and the solvent adopts water with the total hardness of 800 mg/L.
The acid solution is nitric acid solution, and the concentration of solute in the acid solution is 0.001 mol/L; the alkali liquor is sodium hydroxide solution, and the concentration of solute in the alkali liquor is 0.001 mol/L.
2. Cleaning mode
The cleaning mode is divided into gas real-time cleaning and medicament regular cleaning.
Gas is cleaned in real time, and the plate-type ceramic membrane filter is matched with a Roots blower for 15m in the normal working process3The air with the flow rate of/min continuously sweeps the plate-type ceramic membrane surface.
The regular cleaning of the agent is carried out by adopting a mode of combining internal pressure type backwashing with membrane surface soaking, and the cleaning sequence is surfactant cleaning, acid liquor cleaning and alkali liquor cleaning. The method comprises the following specific steps:
washing with a surfactant, namely injecting the prepared surfactant into a membrane pool, and soaking for 30min when the surfactant is higher than the height of the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.25MPa and 25m3Injecting the prepared surfactant into the plate-type ceramic membrane pipe at the flow rate of/h, backwashing for 45min, and emptying the surfactant in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with acid solution, injecting prepared acid solution into the membrane pool, soaking for 30min until the membrane pool is submerged in the plate-type ceramic membrane assembly; the backwash pump was started at a backwash pressure of 0.25MPa and 25m3Injecting prepared acid liquor into the plate-type ceramic membrane pipe at a flow rate of/h, backwashing for 45min, and emptying the acid liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with alkali liquor, injecting prepared alkali liquor into the membrane pool, soaking for 30min until the height of the alkali liquor is higher than that of the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.25MPa and 25m3Injecting prepared alkali liquor into the plate-type ceramic membrane pipe at a flow rate of/h, backwashing for 45min, and emptying the alkali liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning effect
The regular cleaning period is increased from the prior 4 days to 7 days, the backwashing pressure is reduced from the previous 0.4MPa to 0.25MPa, the cleaned plate-type ceramic membrane is intact, and the membrane flux is recovered to 98.5%.
Example 3
In the oil field wastewater treatment project, oil field wastewater enters a plate-type ceramic membrane filter after being subjected to coalescence oil removal, coagulation precipitation and multi-medium filtration, and filtered water meets the reinjection requirement and is used for water injection development. Plate-type ceramic membrane filter treatment capacity of 20m3After a period of operation, the membrane flux is reduced to about 70% of the initial flux, and the membrane flux needs to be cleaned to recover the membrane flux, wherein the cleaning process is as follows:
1. preparation of cleaning agent
The cleaning agent comprises a surfactant, an acid solution and an alkali solution.
The solute in the surfactant comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octylphenol polyoxyethylene ether, and is prepared by compounding the sodium dodecyl benzene sulfonate, the sodium tripolyphosphate and the octylphenol polyoxyethylene ether; in the solute, the mass percent is 65 percent of sodium dodecyl benzene sulfonate, 20 percent of sodium tripolyphosphate and 25 percent of octylphenol polyoxyethylene ether. The mass concentration of solute in the surfactant is 3.5%, and the solvent adopts water with the total hardness of 950 mg/L.
The acid solution is nitric acid solution, and the concentration of solute in the acid solution is 0.002 mol/L; the alkali liquor is sodium hydroxide solution, and the concentration of solute in the alkali liquor is 0.002 mol/L.
2. Cleaning mode
The cleaning mode is divided into gas real-time cleaning and medicament regular cleaning.
Gas is cleaned in real time, and the plate-type ceramic membrane filter is matched with a Roots blower for 25m in the normal working process3The air with the flow rate of/min continuously sweeps the plate-type ceramic membrane surface.
The regular cleaning of the agent is carried out by adopting a mode of combining internal pressure type backwashing with membrane surface soaking, and the cleaning sequence is surfactant cleaning, acid liquor cleaning and alkali liquor cleaning. The method comprises the following specific steps:
washing with a surfactant, namely injecting the prepared surfactant into a membrane pool, and soaking for 45min when the surfactant is higher than the height of the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.3MPa and 25m3Injecting the prepared surfactant into the plate-type ceramic membrane pipe at the flow rate of/h, backwashing for 60min, and emptying the surfactant in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with acid solution, injecting prepared acid solution into the membrane pool, soaking for 45min until the prepared acid solution is submerged in the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.3MPa and 25m3Injecting prepared acid liquor into the plate-type ceramic membrane pipe at a flow rate of/h, backwashing for 60min, and emptying the acid liquor in the membrane pool and the plate-type ceramic membrane pipe.
Cleaning with alkali liquor, injecting prepared alkali liquor into the membrane pool, soaking for 45min when the height of the prepared alkali liquor is higher than that of the prepared alkali liquor and the prepared alkali liquor submerges the plate-type ceramic membrane component; the backwash pump was started at a backwash pressure of 0.3MPa and 25m3Flow direction plate of/hAnd injecting prepared alkali liquor into the ceramic membrane tube, backwashing for 60min, and emptying the alkali liquor in the membrane pool and the plate-type ceramic membrane tube.
Cleaning effect
The regular cleaning period is increased from the prior 4 days to 6 days, the backwashing pressure is reduced from the previous 0.4MPa to 0.3MPa, the cleaned plate-type ceramic membrane is intact, and the membrane flux is recovered to 97.8%.
The state of the plate-type ceramic membranes cleaned in examples 2 and 3 of the present invention before cleaning was substantially the same as that of the plate-type ceramic membranes not cleaned in example 1, and the plate-type ceramic membranes recovered their natural color after cleaning.
Claims (7)
1. A cleaning method of a plate-type ceramic membrane for oilfield wastewater treatment is characterized by comprising the following steps:
in the working process of the plate-type ceramic membrane filter, continuously purging the surface of the plate-type ceramic membrane with gas to prevent insoluble solids from being accumulated on the surface of the plate-type ceramic membrane;
the method for periodically cleaning the plate-type ceramic membrane comprises the following steps:
step 1, cleaning a plate-type ceramic membrane by using a surfactant in a mode of soaking the plate-type ceramic membrane in an internal pressure backwashing combined membrane surface;
step 2, cleaning the plate-type ceramic membrane by using acid liquor in a mode of combining internal pressure backwashing and membrane surface soaking;
step 3, cleaning the plate-type ceramic membrane by using alkali liquor in a mode of soaking the plate-type ceramic membrane in an internal pressure backwashing combined membrane surface;
in the step 1, the step 2 and the step 3, when cleaning is carried out by combining an internal pressure type backwashing and membrane surface soaking mode, the pressure is 0.2-0.3 Mpa, the soaking time is 30-45min, and the backwashing time is 45-60 min;
the surfactant comprises a solute and a solvent, wherein the mass concentration of the solute is 3% -3.5%, the solute comprises sodium dodecyl benzene sulfonate, sodium tripolyphosphate and octyl phenol polyoxyethylene ether, and the mass percentage of the sodium dodecyl benzene sulfonate is 60% -65%, the mass percentage of the sodium tripolyphosphate is 15% -20%, and the balance is the octyl phenol polyoxyethylene ether.
2. The method for cleaning the plate-type ceramic membrane for oilfield wastewater treatment according to claim 1, wherein the method comprises the following steps:
in the step 1, a plate-type ceramic membrane is soaked by a surfactant, then the surfactant is injected into the plate-type ceramic membrane for backwashing, and then the surfactant in the plate-type ceramic membrane is emptied.
3. The method for cleaning the plate-type ceramic membrane for oilfield wastewater treatment according to claim 1, wherein the method comprises the following steps: and 2, soaking the plate-type ceramic membrane by using acid liquor, injecting the acid liquor into the plate-type ceramic membrane, backwashing, and then emptying the acid liquor in the plate-type ceramic membrane.
4. The method for cleaning a plate-type ceramic membrane for oilfield wastewater treatment according to claim 3, wherein the method comprises the following steps: the acid liquor is nitric acid solution, the solute concentration is 0.001-0.002mol/L, the soaking time is 30-45min, and the backwashing time is 45-60 min.
5. The method for cleaning the plate-type ceramic membrane for oilfield wastewater treatment according to claim 1, wherein the method comprises the following steps: and 3, soaking the plate-type ceramic membrane by using alkali liquor, then injecting alkali liquor into the plate-type ceramic membrane, backwashing, and then emptying the alkali liquor in the plate-type ceramic membrane.
6. The method for cleaning a plate-type ceramic membrane for oilfield wastewater treatment according to claim 5, wherein the method comprises the following steps: the alkali liquor is sodium hydroxide solution, the concentration of solute is 0.001-0.002mol/L, the soaking time is 30-45min, and the backwashing time is 45-60 min.
7. The method of claim 1, wherein the solvent is water with a total hardness of less than 1000 mg/L.
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