CN114956491B - Chemical cleaning agent and preparation method and application thereof - Google Patents
Chemical cleaning agent and preparation method and application thereof Download PDFInfo
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- CN114956491B CN114956491B CN202210523608.7A CN202210523608A CN114956491B CN 114956491 B CN114956491 B CN 114956491B CN 202210523608 A CN202210523608 A CN 202210523608A CN 114956491 B CN114956491 B CN 114956491B
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- cleaning agent
- oil
- sludge
- petroleum
- chemical cleaning
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- 239000012459 cleaning agent Substances 0.000 title claims abstract description 152
- 239000000126 substance Substances 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000010802 sludge Substances 0.000 claims abstract description 85
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 72
- 239000002689 soil Substances 0.000 claims abstract description 52
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 38
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 26
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 19
- -1 TX-10 Chemical compound 0.000 claims abstract description 17
- ICLYJLBTOGPLMC-KVVVOXFISA-N (z)-octadec-9-enoate;tris(2-hydroxyethyl)azanium Chemical compound OCCN(CCO)CCO.CCCCCCCC\C=C/CCCCCCCC(O)=O ICLYJLBTOGPLMC-KVVVOXFISA-N 0.000 claims abstract description 16
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 13
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 229910001868 water Inorganic materials 0.000 claims description 23
- 239000003208 petroleum Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 6
- 239000000344 soap Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 89
- 238000004140 cleaning Methods 0.000 description 51
- 239000002245 particle Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 15
- 239000007788 liquid Substances 0.000 description 9
- 238000004945 emulsification Methods 0.000 description 8
- 239000004094 surface-active agent Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 159000000011 group IA salts Chemical class 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000813 microbial effect Effects 0.000 description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011066 ex-situ storage Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013048 microbiological method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention discloses a chemical cleaning agent, a preparation method and application thereof, wherein the chemical cleaning agent comprises a first cleaning agent and a second cleaning agent, the first cleaning agent comprises sodium carbonate, sodium bicarbonate and sodium hydroxide, and the second cleaning agent comprises OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9. Therefore, the chemical cleaning agent can reduce the absolute dry oil content of the oil-containing sludge and/or the petroleum-polluted soil to be lower than 2 weight percent, and saves the cost.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a chemical cleaning agent and a preparation method and application thereof.
Background
The oily sludge and the petroleum polluted soil are piled up for a long time, so that pollution is generated to water, crops and the atmosphere, meanwhile, the safety risk of explosion exists due to volatilization of light components of crude oil, and moreover, the long-time untreated oily sludge and petroleum polluted soil can be ingested by human bodies through the water, the crops and the like to endanger the health of the human bodies. Thus, the treatment of oily sludge and petroleum contaminated soil is urgent.
At present, the treatment technology for oily sludge and petroleum polluted soil can be divided into in-situ treatment and ex-situ treatment from the aspect of construction. In situ treatment is a method of treating a site where oil-containing sludge and petroleum-contaminated soil are produced without transferring the site; ex-situ treatment is a method of transferring oil-containing sludge and petroleum-contaminated soil from a production site to a centralized treatment facility for centralized treatment. The treatment methods of the oily sludge and the petroleum polluted soil can be classified into a microbiological method, a thermal method, a chemical method and the like. The microbial method is to decompose oil in oil-containing sludge and petroleum-polluted soil through petroleum degrading bacteria so as to achieve the aim of removing the oil, and has the advantages of low treatment cost and environmental protection, and the microbial method has the defects that the microbial method needs long-time domestication and cultivation, needs air ventilation and nutrient addition in the treatment process, and has high dependence on environmental temperature, so that the operation difficulty and limitation of the microbial method are high. The thermal method is a method for separating oil in the oil-containing sludge and the petroleum-polluted soil in a gas form from the oil-containing sludge and the petroleum-polluted soil by heating the oil-containing sludge and the petroleum-polluted soil (heating temperature is generally 400-650 ℃), and the thermal method can be classified into a thermal method and a thermal desorption method according to different heating temperatures, and has the advantages of high oil removal rate and short treatment time for the oil in the oil-containing sludge and the petroleum-polluted soil, but has high investment cost and consumes a large amount of electric energy or gas for heating in the operation process, and dioxin and SO are inevitably generated due to high-temperature treatment at the same time 2 And harmful gases such as NOx. The chemical method is a method for adding chemical cleaning agent into oil-containing sludge and petroleum-polluted soil in a water phase state and removing oil substances through the oil displacement characteristic of the cleaning agent, and has the advantages of low investment and operation cost, good cleaning effect, short cleaning time, easy operation and management and the like, and is widely applied; because of the difference of the crude oil components, the soil types and the particle sizes of the oil-containing sludge and the petroleum-polluted soil in different regions, the chemical cleaning agent has higher requirements, and the chemical cleaning agent also becomes a bottleneck problem of the chemical cleaning technology.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a chemical cleaning agent, a preparation method and an application thereof, which can reduce absolute dry oil content of oil-containing sludge and/or petroleum-contaminated soil to less than 2wt% and save cost.
In one aspect of the invention, a chemical cleaning agent is provided. According to an embodiment of the invention, the chemical cleaning agent comprises a first cleaning agent comprising sodium carbonate, sodium bicarbonate and sodium hydroxide and a second cleaning agent comprising OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9.
According to the chemical cleaning agent disclosed by the embodiment of the invention, the chemical cleaning agent comprises a first cleaning agent and a second cleaning agent, wherein the first cleaning agent comprises sodium carbonate, sodium bicarbonate and sodium hydroxide, and oil can be separated from oily sludge with the particle size of more than 75 mu m (low specific surface area) and/or oil-polluted soil particles under the emulsification effect of the first chemical cleaning agent; the second cleaning agent comprises OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9, and under the action of the second chemical cleaning agent, oil in the gaps on the surfaces of oil-containing sludge and/or petroleum-polluted soil particles with the particle size smaller than 75 mu m (high specific surface area) can be thoroughly cleaned. Therefore, compared with the chemical cleaning agent in the prior art, the chemical cleaning agent is lower in cost, the oil-containing sludge and/or petroleum-polluted soil can be sequentially cleaned by adopting the inorganic alkaline salt and the polyoxyethylene ether surfactant, and the absolute oil content of the oil-containing sludge and/or petroleum-polluted soil subjected to the twice cleaning is less than 2wt%, so that the treatment effect is higher and stable.
In addition, the chemical cleaning agent according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the mass ratio of the sodium carbonate, the sodium bicarbonate and the sodium hydroxide is (0.8-3.2): 0-1.2: (0.5-3.5).
In some embodiments of the invention, the concentration of the first cleaning agent is 30 to 50wt%.
In some embodiments of the invention, the mass ratio of the OP-10, the NP-10, the TX-10, the triethanolamine oil soap acid, and the AEO-9 is (0.8-1.3): 0-1.7): 0-1.2: (0.2-1.6): (0.9-1.8).
In some embodiments of the invention, the concentration of the second cleaning agent is 3 to 20wt%.
In a second aspect of the present invention, the present invention provides a method of preparing the chemical cleaning agent described above. According to an embodiment of the invention, the method comprises:
(1) Mixing sodium carbonate, sodium bicarbonate, sodium hydroxide and water to obtain a first cleaning agent;
(2) OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9, and water were mixed to give a second cleaner.
According to the method for preparing the chemical cleaning agent, firstly, sodium carbonate, sodium bicarbonate, sodium hydroxide and water are mixed to obtain a first cleaning agent, and oil can be separated from oil-containing sludge with the particle size of more than 75 mu m (low specific surface area) and/or oil-contaminated soil particles under the emulsification effect of the first chemical cleaning agent; and then, mixing OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9 and water to obtain a second cleaning agent, wherein under the action of the second chemical cleaning agent, oil-containing sludge with the particle size of less than 75 mu m (high specific surface area) and/or oil in gaps on the surfaces of oil-contaminated soil particles can be thoroughly cleaned. Compared with the chemical cleaning agent in the prior art, the chemical cleaning agent prepared by the method has lower cost, and the oil-containing sludge and/or petroleum-polluted soil can be sequentially cleaned by adopting the inorganic alkaline salt and the polyoxyethylene ether surfactant, so that the absolute dry oil content of the oil-containing sludge and/or petroleum-polluted soil with low specific surface area and high specific surface area is less than 2wt% and the treatment effect is higher and stable.
In addition, the method for preparing a chemical cleaning agent according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, in step (1), the concentration of the first cleaning agent is 30 to 50wt%.
In some embodiments of the invention, in step (1), the mass ratio of the sodium carbonate, the sodium bicarbonate and the sodium hydroxide is (0-3.2): 0-1.2: (0.5-3.5).
In some embodiments of the invention, in step (2), the concentration of the second cleaning agent is 3 to 20wt%.
In some embodiments of the invention, in step (2), the mass ratio of the OP-10, the NP-10, the TX-10, the triethanolamine oleic acid, and the AEO-9 is (0.8-1.3): 0-1.7): 0-1.2: (0-1.6): (0.9-1.8).
In a third aspect of the invention, the invention provides the use of a chemical cleaning agent as described above in the treatment of oily sludge and/or petroleum contaminated soil. Thus, the absolute oil content of the oil-containing sludge and/or the oil-contaminated soil can be reduced to be lower than 2wt% by adopting the chemical cleaning agent.
In addition, the method for preparing a chemical cleaning agent according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the mass ratio of the oily sludge and/or petroleum contaminated soil, the first cleaning agent and the second cleaning agent is 1: (0.02-0.05): (0.03-0.1).
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a process flow diagram of a method of preparing a chemical cleaner according to one embodiment of the invention;
FIG. 2 is a graph showing the effect of oil content of the absolute sludge after chemical cleaning of the oily sludge at the bottom of a large tank of a Liaohe oilfield sewage plant according to Experimental example 1;
FIG. 3 is a graph showing the oil content effect of the absolute sludge after the chemical cleaning of the oily sludge at the bottom of the large tank of the middle sea oil and sewage plant according to experimental example 2.
Detailed Description
The following detailed description of embodiments of the invention, examples of which are illustrated in the accompanying drawings and, by way of example, are intended to be illustrative, and not to be construed as limiting, of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In one aspect of the invention, a chemical cleaning agent is provided. According to an embodiment of the invention, the chemical cleaning agent comprises a first cleaning agent and a second cleaning agent, the first cleaning agent comprises sodium carbonate, sodium bicarbonate and sodium hydroxide, and the second cleaning agent comprises OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9.
According to the chemical cleaning agent disclosed by the embodiment of the invention, the chemical cleaning agent comprises a first cleaning agent and a second cleaning agent, wherein the first cleaning agent comprises sodium carbonate, sodium bicarbonate and sodium hydroxide, and oil can be separated from oily sludge with the particle size of more than 75 mu m (low specific surface area) and/or oil-polluted soil particles under the emulsification effect of the first chemical cleaning agent; the second cleaning agent comprises OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9, and under the action of the second chemical cleaning agent, oil in the gaps on the surfaces of oil-containing sludge and/or petroleum-polluted soil particles with the particle size smaller than 75 mu m (high specific surface area) can be thoroughly cleaned. Therefore, compared with the chemical cleaning agent in the prior art, the chemical cleaning agent is lower in cost, the oil-containing sludge and/or petroleum-polluted soil can be sequentially cleaned by adopting the inorganic alkaline salt and the polyoxyethylene ether surfactant, and the absolute oil content of the oil-containing sludge and/or petroleum-polluted soil subjected to the twice cleaning is less than 2wt%, so that the treatment effect is higher and stable.
Further, the concentration of the first cleaning agent is 30-50wt% and the concentration of the second cleaning agent is 3-20wt%. The inventor finds that the excessive concentration of the first cleaning agent can cause the separated oil to be dissolved in the cleaning liquid again, which is not beneficial to the recovery of the oil, and in addition, the high concentration of the first cleaning agent can generate more alkali vapor, so that the environmental impact is large; the concentration of the first cleaning agent is too low, the cleaning efficiency of oil on oil-containing sludge and/or petroleum-polluted soil is low, and the technical index requirement that the absolute oil content is less than 2wt% cannot be met. The charge in the cleaning liquid is reversed due to the too high concentration of the second cleaning agent, so that the aim of cleaning the oil-containing sludge and/or the petroleum polluted soil can not be fulfilled; too low a concentration of the second cleaning agent results in a decrease in the cleaning efficiency of the oil due to a weaker degree of emulsification.
Further, the mass ratio of sodium carbonate, sodium bicarbonate and sodium hydroxide in the first cleaning agent is (0-3.2): (0.5-3.5). The inventor finds that the concentration of each component is too high, and different alkaline ions cannot play a role in cooperatively removing oily sludge and/or oil substances on the surface of petroleum polluted soil; too low a concentration results in low cleaning efficiency due to low alkalinity of the cleaning solution. The mass ratio of OP-10, NP-10, TX-10, triethanolamine oleic soap acid and AEO-9 in the second cleaning agent is (0.8-1.3): 0-1.7): 0-1.2: (0-1.6): (0.9-1.8). The inventor finds that the excessive concentration of each component can cause the charge of the cleaning liquid to be turned over, and has no cleaning effect on oily sludge and/or oil substances on the surface of petroleum polluted soil; too low a concentration may result in weak emulsification of the cleaning liquid, reducing cleaning efficiency.
In a second aspect of the present invention, the present invention provides a method of preparing the chemical cleaning agent described above. Referring to fig. 1, according to an embodiment of the present invention, the method includes:
s100: mixing sodium carbonate, sodium bicarbonate, sodium hydroxide and water
In the step, sodium carbonate, sodium bicarbonate, sodium hydroxide and water are mixed and stirred for 1 to 3 hours at the rotating speed of 30 to 60r/min, so that the inorganic salt is fully dissolved and then is stood until the liquid temperature in the reaction container is reduced to 25 to 30 ℃ so as to avoid the volatilization of alkali liquor steam, and the first cleaning agent is obtained. Specifically, the concentration of the first cleaning agent is 30 to 50wt%. The inventor finds that the excessive concentration of the first cleaning agent can cause the separated oil to be dissolved in the cleaning liquid again, which is not beneficial to the recovery of the oil, and in addition, the high concentration of the first cleaning agent can generate more alkali vapor, so that the environmental impact is larger; the oil on the oil-containing sludge and/or the petroleum polluted soil is low in cleaning efficiency due to the fact that the concentration is too low, and the technical index requirement that the absolute oil content is less than 2wt% cannot be met.
Further, the mass ratio of sodium carbonate, sodium bicarbonate and sodium hydroxide is (0-3.2): (0.5-3.5). The inventor finds that the concentration of each component is too high, and different alkaline ions cannot play a role in cooperatively removing oily sludge and/or oil substances on the surface of petroleum polluted soil; too low a concentration results in low cleaning efficiency due to low alkalinity of the cleaning solution.
S200: mixing OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9 and water
In this step, OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9 and water are mixed and stirred at a rotation speed of 30 to 60r/min for 1 to 3 hours to obtain a second cleaning agent. Specifically, the concentration of the second cleaning agent is 3 to 20wt%. The inventor finds that the excessive concentration of the second cleaning agent can cause charge reversal in the cleaning agent, so that the aim of cleaning the oil-containing sludge and/or the petroleum polluted soil can not be fulfilled; too low a concentration of the second cleaning agent results in a decrease in the cleaning efficiency of the oil due to a weaker degree of emulsification.
Further, the mass ratio of OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9 is (0.8-1.3): 0-1.7): 0-1.2: (0.2-1.6): (0.9-1.8). The inventor finds that the excessive concentration of each component can cause the charge of the cleaning liquid to be turned over, and has no cleaning effect on oily sludge and/or oil substances on the surface of petroleum polluted soil; too low a concentration may result in weak emulsification of the cleaning liquid, reducing cleaning efficiency.
According to the method for preparing the chemical cleaning agent, firstly, sodium carbonate, sodium bicarbonate, sodium hydroxide and water are mixed to obtain a first cleaning agent, and oil can be separated from oil-containing sludge with the particle size of more than 75 mu m (low specific surface area) and/or oil-contaminated soil particles under the emulsification effect of the first chemical cleaning agent; and then, mixing OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9 and water to obtain a second cleaning agent, wherein under the action of the second chemical cleaning agent, oil-containing sludge with the particle size of less than 75 mu m (high specific surface area) and/or oil in gaps on the surfaces of oil-contaminated soil particles can be thoroughly cleaned. Compared with the chemical cleaning agent in the prior art, the chemical cleaning agent prepared by the method has lower cost, and the oil-containing sludge and/or petroleum-polluted soil can be sequentially cleaned by adopting the inorganic alkaline salt and the polyoxyethylene ether surfactant, so that the absolute dry oil content of the oil-containing sludge and/or petroleum-polluted soil with low specific surface area and high specific surface area is less than 2wt% and the treatment effect is higher and stable. It should be noted that the features and advantages described above for the chemical cleaning agent are equally applicable to the method for preparing the chemical cleaning agent, and are not described herein.
In a third aspect of the invention, the invention provides the use of a chemical cleaning agent as described above in the treatment of oily sludge and/or petroleum contaminated soil. Thus, the absolute oil content of the oil-containing sludge and/or the oil-contaminated soil can be reduced to be lower than 2wt% by adopting the chemical cleaning agent.
Further, the mass ratio of the oily sludge and/or petroleum polluted soil to the first cleaning agent to the second cleaning agent is 1: (0.02-0.05): (0.03-0.1). The inventor finds that excessive emulsified cleaning liquid can be formed when the mass ratio of the oil-containing sludge and/or the petroleum-polluted soil to the two cleaning agents is too high, and the cleaning effect is greatly and negatively influenced; if the mass ratio is too low, the cleaning effect cannot reach the technical requirement that the absolute oil content is less than 2wt% due to the low concentration of the cleaning agent.
It should be noted that the features and advantages described above for the chemical cleaning agent and the method for preparing the chemical cleaning agent are also applicable to the method for preparing the chemical cleaning agent, and are not described herein.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
Example 1
Preparing a first cleaning agent:
na is mixed with 2 CO 3 Mixing NaOH and water, wherein Na 2 CO 3 And NaOH at a concentration of 40wt%, na 2 CO 3 The mass ratio of the catalyst to NaOH is 0.8:3.2, fully stirring for 1 hour until the inorganic salt is completely dissolved, and when the temperature of the solution in the reaction kettle is reduced to 25-30 ℃, completing the preparation of the first cleaning agent.
Preparing a second cleaning agent:
mixing OP-10, triethanolamine oleic soap, AEO-9 and water, wherein the concentration of the OP-10, the triethanolamine oleic soap and the AEO-9 is 20wt%, and the mass ratio of the OP-10, the triethanolamine oleic soap and the AEO-9 is 1.0:1.0:1.5, fully stirring for 1 hour at the rotating speed of 30r/min until the organic surfactant is completely dissolved, and completing the preparation of the second cleaning agent.
Example 2
Preparing a first cleaning agent:
NaHCO 3 Mixing NaOH and water, wherein NaHCO 3 And NaOH at a concentration of 30wt%, naHCO 3 The mass ratio of the catalyst to NaOH is 1.0:3.0, fully stirring for 1 hour until the inorganic salt is completely dissolved, and when the temperature of the solution in the reaction kettle is reduced to 25-30 ℃, completing the preparation of the first cleaning agent.
Preparing a second cleaning agent:
mixing OP-10, TX-10, AEO-9 and water, wherein the concentration of OP-10, TX-10 and AEO-9 is 15wt%, and the mass ratio of OP-10, TX-10 and AEO-9 is 0.8:1.1:1.4, fully stirring for 1 hour at the rotating speed of 30r/min until the organic surfactant is completely dissolved, and completing the preparation of the second cleaning agent.
Experimental example 1
The experiment simulates industrialized application of chemical cleaning by using oily sludge at the bottom of a large tank of a Liaohe oilfield sewage plant, and in the simulation application process, the first cleaning agent and the second cleaning agent of the chemical cleaning agent of the embodiment 1 are adopted to be added in two units. Firstly, adding oily sludge at the bottom of a large tank with a certain mass into a first-stage cleaning tank, then adding a first cleaning agent, wherein the adding amount of the first cleaning agent is 5wt% of the mass of the oily sludge, starting stirring to fully mix the oily sludge with the first cleaning agent, standing, extracting bottom sludge slurry, dehydrating until the water content is not more than 70wt%, wherein the absolute dry sludge oil content of the oily sludge at the bottom of the large tank is 20.52wt% before chemical cleaning of the cleaning agent, and the absolute dry sludge oil content of the oily sludge after cleaning is 3.11wt%. And (3) putting the dewatered sludge of the primary chemical cleaning unit into a secondary chemical cleaning unit, adding a second cleaning agent with the mass of 10wt% of the oily sludge, dewatering the bottom sludge slurry after cleaning until the water content is not more than 70wt%, and detecting the absolute dry sludge oil content of the cleaned sludge, wherein the absolute dry sludge oil content after secondary cleaning is 1.32wt%. FIG. 2 is a graph showing oil content data of the absolute sludge after the first cleaning agent and the second cleaning agent are added. From the figure, the oil content of the absolute dry mud is not more than 3.2wt% after the first cleaning agent is added to the primary chemical cleaning unit, and the oil content of the absolute dry mud is not more than 1.4wt% after the second cleaning agent is added to the secondary chemical cleaning unit.
Experimental example 2
The experiment simulates industrialized application of chemical cleaning performed by using oily sludge at the bottom of a large tank of a middle sea oil sewage plant, and in the simulation application process, the first cleaning agent and the second cleaning agent which adopt the chemical cleaning agent of the embodiment 2 are added in two units. Firstly, adding oily sludge at the bottom of a large tank with a certain mass into a first-stage cleaning tank, then adding a first cleaning agent, wherein the adding amount of the first cleaning agent is 4wt% of the mass of the oily sludge, starting stirring to fully mix the oily sludge with the first cleaning agent, standing, extracting bottom mud slurry, and dehydrating until the water content is not more than 70wt%; the oil content of the oil-containing sludge absolute dry at the bottom of the big tank before chemical cleaning is 15.42wt percent, and the oil content of the oil-containing sludge absolute dry after cleaning is 2.84wt percent. And (3) putting the dewatered sludge of the primary chemical cleaning unit into a secondary chemical cleaning unit, adding a second cleaning agent with the mass of the oily sludge being 7wt%, dewatering the bottom sludge slurry after cleaning until the water content is not more than 70wt%, and detecting the absolute dry sludge oil content of the cleaned sludge, wherein the absolute dry sludge oil content after secondary cleaning is 1.18wt%. FIG. 3 is a graph showing oil content data of the absolute sludge after the first cleaning agent and the second cleaning agent are added. From the graph, the oil content of the absolute dry mud is not more than 3.0wt% after the first cleaning agent is added to the primary chemical cleaning unit, and the oil content of the absolute dry mud is not more than 1.2wt% after the second cleaning agent is added to the secondary chemical cleaning unit.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (7)
1. The application of a chemical cleaning agent in the treatment of oily sludge and/or petroleum polluted soil is characterized in that the chemical cleaning agent consists of a first cleaning agent and a second cleaning agent, wherein the first cleaning agent consists of sodium carbonate, sodium bicarbonate and sodium hydroxide, and the second cleaning agent consists of OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9;
the mass ratio of the sodium carbonate to the sodium bicarbonate to the sodium hydroxide is (0-3.2): (0.5-3.5), wherein the first cleaning agent at least comprises one of sodium carbonate and sodium bicarbonate;
the concentration of the first cleaning agent is 30-50wt%;
the mass ratio of the OP-10 to the NP-10 to the TX-10 to the triethanolamine oleic soap acid to the AEO-9 is (0.8-1.3): 0-1.7): 0-1.2: (0-1.6): (0.9-1.8), wherein the second cleaning agent at least comprises one of NP-10, TX-10 and triethanolamine oleic acid;
the concentration of the second cleaning agent is 3-20wt%;
the step of treating the oil-containing sludge and/or petroleum-contaminated soil by the chemical cleaning agent comprises the following steps:
stirring and dehydrating the oily sludge and/or petroleum polluted soil with the first cleaning agent to obtain first insulating dry sludge;
and stirring and dehydrating the first absolute dry mud and the second cleaning agent to obtain second absolute dry mud.
2. The use according to claim 1, wherein the method of preparing the chemical cleaning agent comprises:
mixing sodium carbonate, sodium bicarbonate, sodium hydroxide and water to obtain a first cleaning agent;
OP-10, NP-10, TX-10, triethanolamine oleic acid, AEO-9, and water were mixed to give a second cleaner.
3. The use according to claim 2, wherein in step (1) the concentration of the first cleaning agent is 30-50 wt%.
4. The use according to claim 3, wherein in step (1), the mass ratio of the sodium carbonate, the sodium bicarbonate and the sodium hydroxide is (0 to 3.2): 0 to 1.2: (0.5 to 3.5).
5. The use according to claim 2 or 3, characterized in that in step (2) the concentration of the second cleaning agent is 3-20 wt%.
6. The use according to claim 5, wherein in step (2), the mass ratio of OP-10, NP-10, TX-10, triethanolamine oleic acid and AEO-9 is (0.8-1.3): (0-1.7): (0-1.2): (0-1.6): (0.9 to 1.8).
7. The use according to claim 1, characterized in that the mass ratio of the oily sludge and/or petroleum contaminated soil, the first cleaning agent and the second cleaning agent is 1: (0.02-0.05): (0.03 to 0.1).
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