CN102390880A - Method for performing ultrasonic separation on oily wastewater with oil-soluble ferroferric oxide nanoparticles - Google Patents
Method for performing ultrasonic separation on oily wastewater with oil-soluble ferroferric oxide nanoparticles Download PDFInfo
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Abstract
Description
技术领域 technical field
发明属于环境与材料的交叉领域，涉及一种油溶性四氧化三铁纳米粒子超声分离含油污水的方法用于分离含油污水中的乳化油及其他形式微油滴的技术。The invention belongs to the intersecting field of environment and materials, and relates to a method for ultrasonically separating oily sewage by oil-soluble iron ferric oxide nanoparticles, which is used to separate emulsified oil and other forms of micro-oil droplets in oily sewage.
背景技术 Background technique
油田废水主要有三种来源，一是油井采出液经脱气、脱水处理后分离转输过来的废水，即采油废水；二是洗盐废水；三是洗井水。其中的主要污染物为原油。目前，国内大部分油田已进入中后期开采阶段，主要依靠注水、注表面活性剂以及注聚合物等技术驱替地层中的原油，这些措施产生了大量难以处理的采出水。采出液中的含水率逐年上升，一般为70％-80％。这些废水中的石油含有多种致癌的多环芳烃，污染水体后可通过食物链进入人体，诱发癌症，危害健康。There are three main sources of oilfield wastewater, one is oil well production fluid separated and transferred after degassing and dehydration treatment, that is, oil production wastewater; the other is salt washing wastewater; the third is well washing water. The main pollutant is crude oil. At present, most oilfields in China have entered the mid-to-late stage of exploitation, mainly relying on technologies such as water injection, surfactant injection, and polymer injection to displace crude oil in the formation. These measures have produced a large amount of produced water that is difficult to treat. The water content in the produced fluid increases year by year, generally 70%-80%. The oil in these waste waters contains a variety of carcinogenic polycyclic aromatic hydrocarbons, which can enter the human body through the food chain after polluting water bodies, inducing cancer and endangering health.
磁分离技术作为一项新型的废水处理技术，其应用几乎涉及所有水处理领域。磁分离技术具有效率好、能耗低、易操作、无二次污染和成本低等优点。作为一项极具发展前景的技术，近年来有关直接或间接利用磁技术处理含油废水的报道日益增多。磁性纳米材料作为污染清除剂除具有一般纳米材料比表面积大、吸附速率快的优点，还具有超顺磁性，可以直接分散在溶液中富集目标污染物，快速磁分离后即可完成污染清除，克服了一般纳米污染清除剂难以分离的缺点。油酸修饰的纳米Fe3O4颗粒近年来在一些领域得到了广泛应用，但是在用于环境水样中污染物清除时，由于油酸修饰的Fe3O4具有强疏水性，难以均匀分散在水样中，而且水样中的腐殖酸等有机杂质容易与油酸基团作用，从而附着在其表面上使其清除有机物效果下降。但是在另一方面纳米Fe3O4颗粒经油酸修饰后表面具有大量的非极性基团-长链烃基，容易与油滴结合，结合适当分散方法，便可使其高效进入废水的微油滴使其具有磁性，实现磁分离油田污水中的微油滴。As a new type of wastewater treatment technology, magnetic separation technology is used in almost all water treatment fields. Magnetic separation technology has the advantages of good efficiency, low energy consumption, easy operation, no secondary pollution and low cost. As a promising technology, there are more and more reports on the direct or indirect use of magnetic technology to treat oily wastewater in recent years. As a pollution scavenger, magnetic nanomaterials not only have the advantages of large specific surface area and fast adsorption rate of general nanomaterials, but also have superparamagnetism, which can be directly dispersed in the solution to enrich the target pollutants, and the pollution removal can be completed after rapid magnetic separation. It overcomes the shortcoming that the general nano-pollution scavenger is difficult to separate. Oleic acid-modified nano Fe 3 O 4 particles have been widely used in some fields in recent years, but when used for pollutant removal in environmental water samples, due to the strong hydrophobicity of oleic acid-modified Fe 3 O 4 , it is difficult to disperse uniformly In water samples, and organic impurities such as humic acid in water samples are easy to interact with oleic acid groups, thereby attaching to its surface and reducing the effect of removing organic matter. However, on the other hand, the surface of nano-Fe 3 O 4 particles modified by oleic acid has a large number of non-polar groups-long-chain hydrocarbon groups, which are easy to combine with oil droplets. Combined with appropriate dispersion methods, it can make it efficiently enter the microscopic waste water. The oil droplets make it magnetic, and realize the magnetic separation of micro-oil droplets in oil field sewage.
发明内容 Contents of the invention
本发明目的在于，为了解决现有含油废水、油田采油废水的处理方法不是很有效的问题，提供一种油溶性四氧化三铁纳米粒子超声分离含油污水的方法。该方法先将含油废水进行超声，在超声的同时将油溶性四氧化三铁纳米粒子投入含油废水中，超声分散，四氧化三铁就可以借助其疏水的烷基表面进入废水微油滴中，形成携带疏水四氧化三铁粒子的磁性微油滴，再结合磁分离达到去除污水中微油滴的目的。The purpose of the present invention is to provide a method for ultrasonically separating oily sewage with oil-soluble iron ferric oxide nanoparticles in order to solve the problem that the existing treatment methods for oily wastewater and oilfield wastewater are not very effective. In this method, the oily wastewater is firstly ultrasonicated, and oil-soluble iron ferric oxide nanoparticles are put into the oily wastewater while ultrasonically dispersed, and the ferric oxide can enter the micro-oil droplets of the wastewater with the help of its hydrophobic alkyl surface. Form magnetic micro-oil droplets carrying hydrophobic ferric oxide particles, combined with magnetic separation to achieve the purpose of removing micro-oil droplets in sewage.
本发明所述的一种油溶性四氧化三铁纳米粒子超声分离含油废水的方法，按下列步骤进行：A method for ultrasonically separating oily wastewater by oil-soluble iron ferric oxide nanoparticles according to the present invention is carried out in the following steps:
a、将含油废水进行超声波水浴式超声或探头式超声；a. Ultrasonic water bath ultrasonic or probe ultrasonic for oily wastewater;
b、在含油废水超声的同时加入油溶性四氧化三铁纳米粒子，超声分散5分钟-3小时；b. Add oil-soluble iron ferric oxide nanoparticles while ultrasonicating the oily wastewater, and ultrasonically disperse for 5 minutes to 3 hours;
c、将步骤b超声后的溶液进行永磁铁或电磁场的磁分离，即可达到去除含油废水中的微油滴。c. Subjecting the ultrasonicated solution in step b to magnetic separation with a permanent magnet or an electromagnetic field, the micro oil droplets in the oily wastewater can be removed.
步骤a中所述的含油废水为油田废水、天然气田废水、机械加工废水或餐饮含油废水。The oily wastewater described in step a is oilfield wastewater, natural gas field wastewater, mechanical processing wastewater or catering oily wastewater.
步骤a和步骤b中所述的超声为连续超声、间歇式超声或脉冲式超声。The ultrasound described in step a and step b is continuous ultrasound, intermittent ultrasound or pulsed ultrasound.
步骤b所述的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入0.1-5ml。The addition amount of the oil-soluble iron ferric oxide nanoparticles described in step b is 0.1-5ml per liter of oily wastewater.
步骤b所述的油溶性四氧化三铁纳米粒子为油酸、亚油酸、月桂酸、软脂酸、硬脂酸、豆蔻酸、巴西棕榈酸、亚麻酸或花生四烯酸修饰的四氧化三铁纳米粒子。The oil-soluble iron ferric oxide nanoparticles described in step b are ferric ferric oxide nanoparticles modified by oleic acid, linoleic acid, lauric acid, palmitic acid, stearic acid, myristic acid, carnaubitic acid, linolenic acid or arachidonic acid. TriFe nanoparticles.
本发明所述的油溶性四氧化三铁纳米粒子超声分离含油废水的方法，该方法在含油废水中采用油溶性四氧化三铁纳米粒子进行超声，并形成磁性微油滴以及进行磁分离的原理，由于油溶性Fe3O4表面是油溶性的有机烷烃长链结构，是油溶性的脂溶的表面结构，含油废水中的微油滴也是油溶性的有机相，故当在水中超声分散油溶性的Fe3O4时，会使油溶性的Fe3O4表面的疏水烃链和水中微油滴有充分接触的机会，利用Fe3O4表面的烃链和微油滴的疏水相互作用力进入到含油废污水的微油滴中，进一步通过磁分离使含油废水中的微油滴富集与水相分离。将油溶性的磁性纳米四氧化三铁分散到微油滴中，提供给微油滴磁性，有利于磁分离，解决了微油滴分离难的问题。油田含油废水为黄色浑浊溶液，分散疏水的磁性纳米四氧化三铁的油田含油污水，由于四氧化三铁的加入，油田含油废水变为黑色，使用磁铁进行磁分离后的油田含油废水，可以看出分离后水质变成清澈，含油溶性的磁性纳米四氧化三铁的污油被吸附到磁铁的一侧，成功地实现了磁分离。The method for ultrasonically separating oily wastewater by oil-soluble iron ferric oxide nanoparticles described in the present invention uses oil-soluble iron ferric oxide nanoparticles to conduct ultrasonic waves in oily wastewater, and forms magnetic micro-oil droplets and the principle of magnetic separation , since the surface of oil-soluble Fe 3 O 4 is an oil-soluble organic alkane long-chain structure, which is an oil-soluble fat-soluble surface structure, and the micro-oil droplets in oily wastewater are also oil-soluble organic phases, so when ultrasonically dispersing oil in water When the Fe 3 O 4 is soluble, the hydrophobic hydrocarbon chains on the surface of the oil-soluble Fe 3 O 4 and the micro-oil droplets in the water will have a full contact opportunity, and the hydrophobic interaction between the hydrocarbon chains on the Fe 3 O 4 surface and the micro-oil droplets will be used The force enters the micro-oil droplets in the oily wastewater, and the micro-oil droplets in the oily wastewater are further enriched and separated from the water phase through magnetic separation. The oil-soluble magnetic nano-ferric oxide is dispersed into the micro-oil droplets to provide the micro-oil droplets with magnetism, which is beneficial to magnetic separation and solves the problem of difficult separation of micro-oil droplets. The oily wastewater from the oil field is a yellow turbid solution. The oily wastewater from the oilfield is dispersed with hydrophobic magnetic nanometer ferroferric oxide. Due to the addition of ferric oxide, the oily wastewater from the oilfield turns black. The oily wastewater from the oilfield after magnetic separation using a magnet can be seen After the separation, the water quality becomes clear, and the dirty oil containing oil-soluble magnetic nano-ferric oxide is adsorbed to one side of the magnet, and the magnetic separation is successfully realized.
附图说明 Description of drawings
图1为本发明原理示意图，其中
图2为本发明在含油废水中超声油溶性的Fe3O4分离油前后水质UV-Vis变化图，其中1为处理前含油废水，2为0.5％Fe3O4处理含油废水，3为0.25％Fe3O4处理含油废水。Fig. 2 is the UV-Vis change diagram of water quality before and after ultrasonic oil-soluble Fe 3 O 4 separation oil in oily wastewater according to the present invention, wherein 1 is oily wastewater before treatment, 2 is 0.5% Fe 3 O 4 to treat oily wastewater, 3 is 0.25 %Fe 3 O 4 treatment of oily wastewater.
图3为本发明在含油废水中超声不同剂量油溶性Fe3O4分离油前后550nm光密度变化对比图，其中1为处理前含油废水，2为0.5％Fe3O4处理含油废水，3为0.25％Fe3O4处理含油废水。Fig. 3 is a comparison chart of 550nm optical density changes before and after the oily wastewater is separated by ultrasonication in different doses of oil-soluble Fe 3 O 4 in the present invention, wherein 1 is oily wastewater before treatment, 2 is 0.5% Fe 3 O 4 to treat oily wastewater, and 3 is 0.25% Fe 3 O 4 to treat oily wastewater.
具体实施方式 Detailed ways
实施例1Example 1
a、将油田废水20ml进行超声波水浴式连续超声；a. 20ml of oilfield wastewater is subjected to ultrasonic water-bath continuous ultrasonication;
b、在油田废水超声的同时加入油酸修饰的油溶性四氧化三铁纳米粒子，超声分散5分钟，其中油酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入0.1ml；b. Add oil-soluble iron ferric oxide nanoparticles modified by oleic acid while ultrasonicating the oil field wastewater, and disperse by ultrasonic for 5 minutes. 0.1ml;
c、将步骤b超声后的溶液进行永磁铁的磁分离，使用紫外分光光度计扫描溶液，油田污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象(图2)，特别在紫外区由于烯烃在此会存在吸收，故在波长小于300纳米以下紫外光显示出很强的吸收，而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform the magnetic separation of the permanent magnet on the ultrasonic solution in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the existence of micro-oil droplets, the oil field sewage has a scattering effect on visible light, so it is turbid and shows a high visible light absorption phenomenon. (Figure 2), especially in the ultraviolet region, because olefins will absorb here, so the ultraviolet light with a wavelength of less than 300 nanometers shows strong absorption, and the water sample separated by ultrasonic oil-soluble ferric oxide nanoparticles No matter in the visible light range or the ultraviolet region, the absorption is significantly reduced, and the micro oil droplets in the oily wastewater can be removed.
使用油溶性四氧化三铁纳米粒子超声分离含油废水微油滴前后的水样在550nm波长处光密度的变化(图3)，处理前油田污水在550nm波长处光密度为1.679，而使用超声0.05ml油溶性四氧化三铁纳米粒子分离微油滴后的水样在550nm波长处光密度为0.036，使用超声0.1ml油溶性四氧化三铁纳米粒子分离微油滴后的水样在550nm波长处光密度为0.021，可见通过使用超声油溶性四氧化三铁纳米粒子分离微油滴前后的水样具有用量少、分离效果好的特点。Changes in optical density at 550nm wavelength of water samples before and after ultrasonic separation of oily wastewater micro-oil droplets using oil-soluble iron ferric oxide nanoparticles (Figure 3). The optical density of the water sample after the oil-soluble ferric oxide nano-particles are separated from the micro-oil droplets is 0.036 at a wavelength of 550nm. The optical density is 0.021. It can be seen that the water samples before and after the separation of micro-oil droplets by using ultrasonic oil-soluble ferric oxide nanoparticles have the characteristics of less dosage and good separation effect.
实施例2Example 2
a、将天然气田废水20ml进行超声波探头式间歇式超声；a, 20ml of natural gas field waste water is subjected to ultrasonic probe type intermittent ultrasonic;
b、在天然气田废水超声的同时加入亚油酸修饰的油溶性四氧化三铁纳米粒子，超声分散10分钟，其中亚油酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入0.5ml；b. Add oil-soluble iron ferric oxide nanoparticles modified by linoleic acid while supersonicating natural gas field wastewater, and ultrasonically disperse for 10 minutes, wherein the amount of oil-soluble iron ferric oxide nanoparticles modified by linoleic acid is per liter of oil Add 0.5ml to the waste water;
c、将步骤b超声后的溶液进行电磁场的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样在可见光范围和紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。通过使用超声油溶性四氧化三铁纳米粒子分离微油滴前后的水样具有用量少、分离效果好的特点。c. Perform magnetic separation of the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the presence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles have significantly reduced absorption in the visible light range and ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater. The water samples before and after the separation of micro-oil droplets by using ultrasonic oil-soluble ferric oxide nanoparticles have the characteristics of less dosage and good separation effect.
实施例3Example 3
a、将机械加工含油废水20ml进行超声波水浴式脉冲式超声；a, 20ml of mechanically processed oily waste water is subjected to ultrasonic water bath type pulse ultrasonic;
b、在机械加工含油废水超声的同时加入月桂酸修饰的油溶性四氧化三铁纳米粒子，超声分散30分钟，其中月桂酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入1ml；b. Add lauric acid-modified oil-soluble iron ferric oxide nanoparticles while ultrasonically processing oily wastewater, and ultrasonically disperse them for 30 minutes, wherein the amount of oil-soluble iron ferric oxide nanoparticles modified by lauric acid is per liter of oily wastewater Add 1ml to it;
c、将步骤b超声后的溶液进行永磁铁的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of permanent magnets on the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the existence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater.
实施例4Example 4
a、将餐饮含油废水20ml进行超声波探头式连续超声；a. Conduct ultrasonic probe type continuous ultrasound on 20ml of catering oily wastewater;
b、在餐饮含油废水超声的同时加入软脂酸修饰的油溶性四氧化三铁纳米粒子，超声分散50分钟，其中软脂酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入1.5ml；b. Add palmitic acid-modified oil-soluble iron ferric oxide nanoparticles while supersonicating the catering oily wastewater, and ultrasonically disperse for 50 minutes, wherein the amount of palmitic acid-modified oil-soluble iron ferric oxide nanoparticles per liter of oil Add 1.5ml to the waste water;
c、将步骤b超声后的溶液进行电磁场的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the presence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater.
实施例5Example 5
a、将油田废水20ml进行超声波探头式间歇式超声；a. Perform ultrasonic probe-type intermittent ultrasonication on 20ml of oilfield wastewater;
b、在油田废水超声的同时加入硬脂酸修饰的油溶性四氧化三铁纳米粒子，超声分散1小时，其中硬脂酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入2ml；b. Add stearic acid-modified oil-soluble iron ferric oxide nanoparticles while supersonicating the oilfield wastewater, and ultrasonically disperse for 1 hour, wherein the amount of stearic acid-modified oil-soluble iron ferric oxide nanoparticles per liter of oily wastewater Add 2ml to it;
c、将步骤b超声后的溶液进行电磁场的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the presence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater.
实施例6Example 6
a、将天然气田废水进行超声波水浴式连续超声；a. Continuously ultrasonicate the natural gas field wastewater in an ultrasonic water bath;
b、在天然气田废水超声的同时加入豆蔻酸修饰的油溶性四氧化三铁纳米粒子，超声分散1.5小时，其中豆蔻酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入2.0ml；b. Add myristic acid-modified oil-soluble iron ferric oxide nanoparticles while supersonicating natural gas field wastewater, and ultrasonically disperse for 1.5 hours, wherein the amount of myristic acid-modified oil-soluble iron ferric oxide nanoparticles is per liter of oily wastewater Add 2.0ml;
c、将步骤b超声后的溶液进行永磁铁的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of permanent magnets on the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the existence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater.
实施例7Example 7
a、将机械加工废水进行超声波探头式间歇式超声；a. The mechanical processing wastewater is subjected to ultrasonic probe-type intermittent ultrasound;
b、在机械加工废水超声的同时加入巴西棕榈酸修饰的油溶性四氧化三铁纳米粒子，超声分散2小时，其中巴西棕榈酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入2.5ml；b. Add the oil-soluble iron ferric oxide nanoparticles modified by carnaubitic acid while supersonicating the mechanical processing wastewater, and ultrasonically disperse for 2 hours. Add 2.5ml to the waste water;
c、将步骤b超声后的溶液进行电磁场的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the presence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, which can achieve the removal of micro-oil droplets in oily wastewater.
实施例8Example 8
a、将餐饮含油废水进行超声波水浴式脉冲式超声；a. The catering oily wastewater is subjected to ultrasonic water bath pulse ultrasonic;
b、在餐饮含油废水超声的同时加入亚麻酸修饰的油溶性四氧化三铁纳米粒子，超声分散25分钟，其中亚麻酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入3.5ml；b. Add oil-soluble iron ferric oxide nanoparticles modified by linolenic acid while ultrasonicating the oily wastewater of catering, and disperse by ultrasonication for 25 minutes. Add 3.5ml;
c、将步骤b超声后的溶液进行永磁铁的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of permanent magnets on the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the presence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, and the micro oil droplets in the oily wastewater can be removed.
实施例9Example 9
a、将天然气田废水进行超声波探头式脉冲式超声；a. The natural gas field wastewater is subjected to ultrasonic probe-type pulsed ultrasound;
b、在天然气田含油废水超声的同时加入花生四烯酸修饰的油溶性四氧化三铁纳米粒子，超声分散3小时，其中花生四烯酸修饰的油溶性四氧化三铁纳米粒子的加入量为每升含油废水中加入5ml；B, adding the oil-soluble iron ferric oxide nanoparticles modified by arachidonic acid while supersonicating the oily waste water in the natural gas field, and ultrasonically dispersed for 3 hours, wherein the addition amount of the oil-soluble iron ferric oxide nanoparticles modified by arachidonic acid is Add 5ml per liter of oily wastewater;
c、将步骤b超声后的溶液进行电磁场的磁分离，使用紫外分光光度计扫描溶液，污水由于微油滴的存在，对可见光具有散射作用故呈浑浊，呈现出较高的可见光吸收现象。而经过使用超声油溶性四氧化三铁纳米粒子分离后的水样不论在可见光范围还是紫外区吸收都显著下降，即可达到去除含油废水中的微油滴。c. Perform magnetic separation of the solution after ultrasonication in step b, and scan the solution with an ultraviolet spectrophotometer. Due to the existence of micro-oil droplets, the sewage has a scattering effect on visible light, so it is turbid and shows a higher visible light absorption phenomenon. However, the absorption of water samples separated by ultrasonic oil-soluble ferric oxide nanoparticles is significantly reduced in both the visible light range and the ultraviolet region, and the micro oil droplets in the oily wastewater can be removed.
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