CN111097230B - Modified glass filter material for oilfield sewage treatment and preparation method thereof - Google Patents
Modified glass filter material for oilfield sewage treatment and preparation method thereof Download PDFInfo
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- CN111097230B CN111097230B CN201911408220.7A CN201911408220A CN111097230B CN 111097230 B CN111097230 B CN 111097230B CN 201911408220 A CN201911408220 A CN 201911408220A CN 111097230 B CN111097230 B CN 111097230B
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Abstract
The invention discloses a modified glass filter material for oilfield sewage treatment and a preparation method thereof. The modification treatment can also adopt a coupling agent to carry out surface hydrophobicity modification on the glass filter material, and the modified glass filter material obtained by activation can be used for oil field sewage treatment. According to the invention, the modified glass filter material is prepared from the waste glass, and compared with the traditional modified filter material, the modified glass filter material has a good water treatment effect and stable effluent quality; meanwhile, the backwashing regeneration effect of the modified glass filter material is good, the iron removal effect is obviously superior to that of a common sand filter material, the service life is long, the water treatment operation cost is greatly reduced, the concept of energy conservation and environmental protection in the current society is met, and the effluent quality and the treatment efficiency in the oilfield sewage treatment are improved.
Description
Technical Field
The invention relates to the technical field of oilfield sewage treatment, in particular to a modified glass filter material for oilfield sewage treatment and a preparation method thereof.
Background
In the process of crude oil extraction, a large amount of oily sewage is generated, so that the oily sewage needs to be effectively treated to reach the emission standard or the reinjection standard so as to realize limited protection of water resources, realize recycling of sewage, and realize effective protection of the environment while obtaining good economic benefit. Along with the increasing difficulty of oil exploitation, the quality of oily wastewater is increasingly complex, and the difficulty of water treatment is also increasing day by day.
The filtration method has the advantages of good treatment effect, mature process, low investment and the like, and has good effect of removing oil droplets with the particle size of less than 10 mu m in low-concentration wastewater, so the filtration method becomes the most common operation unit for the advanced treatment of the oily wastewater. The Chinese patent CN106422520B discloses a modified walnut shell filter material for oil field sewage treatment and a preparation method thereof, and the preparation method comprises the following steps: under the conditions of alkaline condition and the existence of a sulfonating reagent, the walnut shell filter material is steamed and boiled in water to obtain the modified walnut shell filter material; the sulfonating agent is Na2SO3、NaHSO3And HOCH2·NaSO3Any of the above. The modified walnut shell filter material provided by the invention can be used for treating oil field sewage. The method is based on the principle that oil drops of main pollutants in water, clay mineral particles and residual medicaments are mainly negatively charged, and utilizes the principle of electrostatic repulsion, groups with negative charges are connected to the surface of a walnut shell through chemical modification, so that the hydrophilicity of the walnut shell is enhanced, and the purposes of optimizing the filtering effect and improving the backwashing capacity are achieved. The most adopted filter materials such as quartz sand, walnut shells and the like in the filtering process have the following problems in the using process:
(1) after long-time use, the filter material is hardened, and the quality of effluent water is reduced;
(2) poor backwashing regeneration effect, short service life of filter materials and high water treatment cost.
In view of the above, there is an urgent need to improve the existing modified filter material for oilfield sewage treatment, so as to improve the filtering performance and backwashing regeneration capability of the filter material, prolong the service life and reduce the water treatment cost.
Disclosure of Invention
The technical problem to be solved by the invention is that the existing method for treating the oil field sewage by adopting the filter material has the defects that the filter material is hardened after being used for a long time, the effluent quality is reduced, the backwashing regeneration effect is poor, the service life of the filter material is short, and the water treatment cost is high.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide a modified glass filter material for oilfield sewage treatment and a preparation method thereof, wherein the preparation method of the modified glass filter material comprises the following steps:
firstly, screening a glass filter material from waste glass;
secondly, placing the screened glass filter material into an acid solution, adjusting the pH value of the glass filter material to be close to neutral, and cleaning and drying the glass filter material for later use;
thirdly, putting the prepared glass filter material into a modification solution, adding a sodium hydroxide NaOH solution, adjusting the pH value to be alkaline to form a milky suspension, immersing the glass filter material subjected to surface treatment into the prepared suspension, uniformly stirring to ensure that the glass filter material is fully contacted with the suspension, drying and cooling to obtain a primarily modified glass filter material;
and fourthly, dehydrating the preliminarily modified glass filter material to reduce the water content of the glass filter material to obtain the modified glass filter material.
In the above scheme, the dehydration treatment adopts high-temperature dehydration treatment, and the water content of the glass filter material is lower than 0.1% under a high-temperature condition, so that the modified glass filter material is obtained.
In the above scheme, the modification treatment may further include performing surface hydrophobicity modification on the glass filter material by using a coupling agent, immersing the preliminarily modified glass filter material obtained in the third step in the coupling agent subjected to alcoholysis, reacting at 90 ℃ for 15 minutes, stirring uniformly during the reaction process to uniformly cover the glass surface with the coupling agent, and taking out and drying the filter material after the reaction is finished to obtain the hydrophobically modified filter material.
In the above scheme, in the second step, the acidic solution is a hydrogen chloride HCL solution.
In the above scheme, in the third step, the modification solution is crystalline aluminum chloride AlCl3·6H2And (4) O solution.
In the scheme, the pH value of the glass filter material after modification treatment is 8-10.
In the above scheme, the coupling agent is a titanate coupling agent, and the preliminarily modified glass filter material is introduced into 15% of the titanate coupling agent after alcoholysis.
In the scheme, the modified glass filter material for treating the oilfield sewage is prepared by the method.
In the scheme, the modified glass filter material is applied to the treatment of oilfield sewage.
Compared with the prior art, the preparation method of the modified glass filter material provided by the invention has the advantages that the modified glass filter material is obtained by carrying out catalytic oxidation on common waste glass, and the activation process mainly comprises an acidic treatment stage, a modification treatment stage and a high-temperature dehydration stage. The modification treatment can also adopt a coupling agent to carry out surface hydrophobicity modification on the glass filter material, and the modified glass filter material obtained by activation can be used for oil field sewage treatment. Compared with the traditional filter material, the modified glass filter material has good treatment effect and stable effluent quality; meanwhile, the backwashing regeneration effect of the modified glass filter material is good, the iron removal effect is obviously superior to that of a common sand filter material, the service life is long, the water treatment operation cost is greatly reduced, the concept of energy conservation and environmental protection in the current society is met, and the effluent quality and the treatment efficiency in the oilfield sewage treatment are improved.
Drawings
FIG. 1 is a SEM schematic view of the surface of a raw glass filter material before modification;
FIG. 2 is a SEM schematic view of the surface of the modified raw glass filter material;
FIG. 3 is a schematic diagram of the oil removal effect of the modified glass filter material and the quartz sand filter material in the application example;
FIG. 4 is a schematic diagram showing the effect of removing suspended matters in the modified glass filter material and the quartz sand filter material in an application example.
Detailed Description
The invention provides a modified glass filter material for oilfield sewage treatment and a preparation method thereof.
The invention is described in detail below with reference to the drawings and the detailed description.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents, solutions and the like used in the following examples are commercially available unless otherwise specified.
Example 1, preparation of a modified glass filter material and oilfield wastewater treatment, comprising the following steps:
and step S10, crushing the waste glass raw material to 4-8mm, and screening to obtain filter material with the particle size of 6mm for later use.
And S11, boiling the screened glass filter material in distilled water for 30 minutes, repeatedly washing the glass filter material by the distilled water, drying and cooling the glass filter material at a high temperature of 110 ℃, soaking the glass filter material in 1mol/L Hydrogen Chloride (HCL) solution for 24 to 36 hours after cooling, taking out the glass filter material, soaking the glass filter material in absolute ethyl alcohol solution again, taking out the glass filter material after ultrasonic cleaning for 30 minutes, washing the glass filter material by the distilled water again until the pH value of the liquid for cleaning the glass filter material is close to neutral, drying the glass filter material again, storing the glass filter material in a sealable plastic sample bag after cooling, and putting the glass filter material in a drying dish for later use.
And S12, immersing the cleaned filter material into 1mol/L modified solution crystalline aluminum chloride AlCl 3.6H2O (the pH value is adjusted to 8-10), adding a sodium hydroxide solution to form a milky suspension, immersing the glass filter material subjected to surface treatment into the prepared suspension, uniformly stirring, taking out after 48 hours, and stirring once at regular intervals during a test to ensure that the filter material is fully contacted with the modified solution, thereby ensuring the modification effect. Drying for later use, and storing the filter material in a drying vessel by adopting a plastic package bag.
And step S13, after the reaction is finished, dehydrating at high temperature to ensure that the water content of the filter material is lower than 0.1 percent, thus obtaining the modified glass filter material.
Example 2, modifying the hydrophilicity of a glass surface using a coupling agent, comprising the steps of:
and step S20, crushing the waste glass raw material to 4-8mm, and screening to obtain filter material with the particle size of 6mm for later use.
And S21, boiling the screened filter material in distilled water for 30min, repeatedly washing the filter material with distilled water, drying the filter material at 110 ℃, cooling the filter material, soaking the filter material in 1mol/L Hydrogen Chloride (HCL) solution for 24-36h, soaking the filter material in absolute ethyl alcohol solution again, ultrasonically cleaning the filter material for 30min, washing the filter material with water again until the pH value of the cleaning solution is close to neutral, drying the filter material again, cooling the filter material, storing the filter material in a sealable plastic sample bag, and putting the filter material in a drying dish for later use.
And S22, immersing the cleaned filter material into a 1mol/L modified solution crystalline aluminum chloride AlCl 3.6H2O solution, adjusting the pH value to 8-10, achieving alkalinity, adding a sodium hydroxide NaOH solution to form a milky suspension, immersing the glass filter material subjected to surface treatment into the prepared suspension, uniformly stirring, taking out after 48 hours, stirring once at regular intervals during the test period, and fully contacting the filter material with the modified solution to ensure the modification effect. Drying for later use, and storing the filter material in a drying vessel by adopting a plastic package bag.
And step S23, immersing the preliminarily modified glass filter material into 15% of coupling agent after alcoholysis, reacting for 15 minutes at 90 ℃, uniformly stirring in the reaction process to enable the coupling agent to uniformly cover the surface of the glass, and taking out the filter material and drying after the reaction is finished to obtain the modified filter material.
Application example 1
When the modified glass filter material is used for a certain offshore platform of middle-sea oil, the water quality of inlet water is that water is produced by the offshore platform, the oil content of inlet water and the oil content of filtered water passing through quartz sand and modified glass are shown in figure 3, the content of inlet water suspended matters and the content of filtered water suspended matters passing through quartz sand and modified glass are shown in figure 4, the oil removing effect and the suspended matter removing effect of the modified glass can be visually seen from figures 3 and 4 to be obviously higher than those of traditional quartz sand, and the water quality of the outlet water of the modified glass filter material can reach the standard of reinjection water A2 to meet the reinjection requirement.
The main principle of the invention is as follows:
the hydrochloric acid solution can dissolve carbonate and salt in the glass to form a rough or porous structure, so that the glass has a high surface area, and the adsorption and absorption performance is better when the surface area is larger. After the modified solution is treated, the surface is covered by the aluminum salt modifier, countless micro-particles are accumulated on the surface to form a specific surface area which is much larger than that of the original carrier, and the adsorption performance is greatly improved. After the filter material is modified by the coupling agent, the surface of the filter material is uniformly covered with the coupling agent, and long-chain organic groups on the titanate coupling agent are grafted to the surface of the quartz sand filter material after alcoholysis, so that lipophilicity is enhanced, and oil removal effect is enhanced.
Compared with the prior art, the preparation method of the modified glass filter material provided by the invention has the advantages that the modified glass filter material is obtained by carrying out catalytic oxidation on common waste glass, and the activation process mainly comprises an acidic treatment stage, a modification treatment stage and a high-temperature dehydration stage. The modification treatment can also adopt a coupling agent to carry out surface hydrophobicity modification on the glass filter material, and the modified glass filter material obtained by activation can be used for oil field sewage treatment. Compared with the traditional filter material, the modified glass filter material has good treatment effect and stable effluent quality; meanwhile, the backwashing regeneration effect of the modified glass filter material is good, the iron removal effect is obviously superior to that of a common sand filter material, the service life is long, the water treatment operation cost is greatly reduced, the concept of energy conservation and environmental protection in the current society is met, and the effluent quality and the treatment efficiency in the oilfield sewage treatment are improved.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (7)
1. The preparation method of the modified glass filter material for oilfield sewage treatment is characterized by comprising the following steps:
firstly, screening a glass filter material from waste glass, crushing the waste glass raw material to 4-8mm, and screening to obtain a filter material with the particle size of 6mm for later use;
secondly, placing the screened glass filter material into an acid solution, wherein the acid solution is a Hydrogen Chloride (HCL) solution, adjusting the pH value of the glass filter material to be close to neutral, and cleaning and drying the glass filter material for later use;
thirdly, putting the prepared glass filter material into a modification solution, adding a sodium hydroxide NaOH solution, adjusting the pH value to be alkaline to form a milky suspension, immersing the glass filter material subjected to surface treatment into the prepared suspension, uniformly stirring to ensure that the glass filter material is fully contacted with the suspension, drying and cooling to obtain a primarily modified glass filter material;
and fourthly, dehydrating the preliminarily modified glass filter material to reduce the water content of the glass filter material to obtain the modified glass filter material.
2. The method for preparing the modified glass filter material for oilfield sewage treatment as defined in claim 1, wherein in the fourth step, the dehydration treatment is a high temperature dehydration treatment, and the water content of the glass filter material is lower than 0.1% under a high temperature condition, so as to obtain the modified glass filter material.
3. The preparation method of the modified glass filter material for oilfield sewage treatment as defined in claim 1, wherein the preliminarily modified glass filter material obtained in the third step is immersed in the coupling agent after alcoholysis, and reacted at 90 ℃ for 15 minutes, and stirred uniformly during the reaction process, so that the coupling agent uniformly covers the surface of the glass, and after the reaction is finished, the filter material is taken out and dried to obtain the hydrophobic modified filter material.
4. The method for preparing the modified glass filter material for oilfield sewage treatment as defined in claim 1, wherein in the third step, the modified solution is crystalline aluminum chloride (AlCl)3·6H2And (4) O solution.
5. The method for preparing the modified glass filter material for oilfield sewage treatment as defined in claim 1, wherein the glass filter material after alkaline treatment has a pH of 8-10.
6. The method for preparing the modified glass filter material for oilfield sewage treatment as defined in claim 3, wherein the coupling agent is a titanate coupling agent, and the preliminarily modified glass filter material is introduced into 15% of the titanate coupling agent after alcoholysis.
7. A modified glass filter material for oilfield sewage treatment, characterized by being prepared according to the method of any one of claims 1 to 6.
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