CN110665473A - Compound water quality treatment material for wastewater and sewage - Google Patents
Compound water quality treatment material for wastewater and sewage Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention relates to a composite water quality treatment material for wastewater and sewage, which is prepared by the following steps: pretreating S1 zeolite; s2, preparing zeolite-loaded nano titanium dioxide; s3, preparing modified bentonite; s4, weighing the components according to the mass percentage of 3-5% of pullulan polysaccharide, 5-10% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the wastewater and sewage composite water quality treatment material. The wastewater and sewage composite water quality treatment material provided by the invention has the characteristics of simple preparation method, strong operability, high treatment effect and the like, and can effectively improve the treatment/purification capacity of sewage/wastewater in the prior art.
Description
Technical Field
The invention relates to a composite water quality treatment material for wastewater and sewage.
Background
In recent years, water pollution is one of the pollution problems with the highest attention of people, and more sewage plants are built because China gives high attention to water pollution treatment. Sludge, which is a solid or semi-solid waste generated in a water treatment process in a municipal sewage treatment plant, increases as the amount of sewage treatment increases. The discharge amount of urban domestic sewage reaches 535.2 hundred million tons in 2015, which accounts for 72.8 percent of the total discharge amount of wastewater, and the discharge amount of sludge is 4282 million tons (calculated by 80 percent of water content) in 2015. With the improvement of living standard, people have higher and higher requirements on water quality, the treatment rate and the treatment depth of sewage are increased, and the total amount of sludge generated is increased by 10 percent per year. Because the sludge in the sewage plant has high water content and large volume, and the sludge contains various organic components and inorganic components, a large amount of organic pollutants are easy to decay and smell, and the sanitation condition of the environment is seriously influenced, and toxic organic matters, heavy metals, pathogenic bacteria (pathogenic bacteria, parasitic ova, pathogens and the like) and the like contained in the sludge have toxicity and nondegradable property, if the pollutants are not safely disposed, the pollutants circulate through biological chains in different forms, and potential safety hazards can be generated in the growth period of soil, rivers and even human bodies.
Water pollution is mainly caused by pollutants generated by human activities. Three pollution sources pollute water, including industrial pollution sources, agricultural pollution sources and domestic pollution sources. The industrial wastewater is an important pollution source of a water area, and has the characteristics of large quantity, wide range, complex components, high toxicity, difficult purification, difficult treatment and the like. The industrial wastewater refers to wastewater, sewage and waste liquid generated in the industrial production process, and contains industrial production materials, intermediate products and products which are lost along with water, and pollutants generated in the production process. With the rapid development of industry, the variety and quantity of waste water are rapidly increased, the pollution to water bodies is more and more extensive and serious, and the health and the safety of human beings are threatened. The treatment of industrial waste water is more important than the treatment of municipal sewage for environmental protection. Industrial waste water is generally divided into three categories: the first is classified according to the chemical properties of main pollutants contained in industrial wastewater, and inorganic wastewater mainly contains inorganic pollutants and organic wastewater mainly contains organic pollutants. For example electroplating wastewater and wastewater from mineral processing, are inorganic wastewater; the waste water from food or petroleum processing is organic waste water. The second is classified according to the products and processing objects of industrial enterprises, such as metallurgical wastewater, paper-making wastewater, coke-oven gas wastewater, metal pickling wastewater, chemical fertilizer wastewater, textile printing and dyeing wastewater, dye wastewater, tanning wastewater, pesticide wastewater, power station wastewater and the like. The third is classified according to the main components of the pollutants contained in the wastewater, such as acidic wastewater, alkaline wastewater, cyanide-containing wastewater, chromium-containing wastewater, cadmium-containing wastewater, mercury-containing wastewater, phenol-containing wastewater, aldehyde-containing wastewater, oil-containing wastewater, sulfur-containing wastewater, organic phosphorus-containing wastewater, radioactive wastewater, and the like. The toxic and harmful substances in nature are very diverse. Some substances can cause harm to the body directly, and some substances can not cause harm directly, but can show certain toxicity after the amount is increased to a certain degree or after the substances are subjected to biotransformation under certain conditions. Some chemical elements are essential elements for maintaining normal physiological activities of the body within a certain concentration range. When the concentration exceeds a certain range, body poisoning may occur, such as copper, zinc, selenium, etc. Still other chemical elements are not required for normal physiological activities of the body. Such as lead, arsenic, mercury, cadmium, etc. The phenolic compound is a product obtained by substituting a hydrogen atom on a benzene ring in aromatic hydrocarbon by a hydroxyl group. The phenol is classified into monohydric phenol, dihydric phenol, and trihydric phenol according to the number of hydroxyl groups on the benzene ring. Monohydric phenol having a boiling point below 230 ℃ is volatile, also called volatile phenol, the remainder being non-volatile phenol. Phenolic compounds are the most toxic as phenol.
The water treatment agent is a chemical agent required in the treatment process of industrial water, domestic water and wastewater. After the treatment of the chemical agents, the water quality can reach certain requirements. The main functions of the method are to control the formation of scale and sludge, reduce foam, reduce the corrosion of materials contacting with water, remove suspended solids and toxic substances in water, deodorize, decolor, soften and stabilize water quality; the water treatment agent comprises a coagulant, a flocculant, a corrosion inhibitor, a scale inhibitor, a bactericide, a dispersant and the like.
The chinese granted patent CN107244723B provides a sewage purifying agent with combined properties of photocatalysis and coagulation and its application, however, the sewage treatment/purification capability of the prior art including the above patent documents still needs to be further improved, thereby satisfying the increasingly severe sustainable development requirement.
Disclosure of Invention
In order to solve the technical problem that the sewage treatment/purification capacity still needs to be further improved in the prior art and further meet the increasingly severe sustainable development requirement, the invention provides the following technical scheme:
a composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3-5% of pullulan polysaccharide, 5-10% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water treatment material.
Preferably, the coupling agent in S2 is composed of coupling agent 1 and coupling agent 2 according to the mass ratio of 2: 1;
wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
preferably, the calcination process in S3 is divided into two successive stages, the first stage being calcination at 500 ℃ for 3 hours and the second stage being calcination at 650 ℃ for 3 hours.
Preferably, the particle size of the zeolite in S1 is 30 meshes, and the concentration of the hydrochloric acid solution is 0.1 mol/L.
Preferably, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours.
Preferably, the ultrasonic treatment time in S2 is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours.
Preferably, the concentration of the sulfuric acid in the S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
The technical scheme of the invention has the following beneficial effects:
(1) the method has the advantages that the loading effect of the nano titanium dioxide can be improved by adding the coupling agent in the process of loading the nano titanium dioxide on the zeolite, so that the nano titanium dioxide is more easily loaded on the zeolite in the optimal nano state to the maximum extent, and further the adsorption and removal effects of the water quality treatment material are improved.
(2) In the preparation process of the modified bentonite, the calcination temperature and the calcination time are reasonably optimized, so that the surface characteristics of the bentonite can be optimized, interlayer adsorption water and impurities in pores can be removed, the adsorption resistance generated by a water film and the impurities is reduced, and the adsorbability of the bentonite is finally improved.
(3) The experimental results show that: the invention uses 1g of water quality treatment material to treat Cr3+Treating 30ml of simulated chromium-containing wastewater with the mass concentration of 120mg/L to finally obtain Cr3+The removal rate is 99.1%, and therefore, the invention can purify more waste water by using a water quality treatment material with less consumption and keep higher purification efficiency, which is superior to the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following examples and comparative examples.
Example 1
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 4% of pullulan polysaccharide, 7% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in the S2 is composed of a coupling agent 1 and a coupling agent 2 according to the mass ratio of 2: 1;
wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
in S3, the calcination process is divided into two successive stages, the first stage is calcination at 500 ℃ for 3 hours, and the second stage is calcination at 650 ℃ for 3 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Example 2
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3% of pullulan polysaccharide, 5% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in the S2 is composed of a coupling agent 1 and a coupling agent 2 according to the mass ratio of 2: 1;
wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
in S3, the calcination process is divided into two successive stages, the first stage is calcination at 500 ℃ for 3 hours, and the second stage is calcination at 650 ℃ for 3 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Example 3
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 5% of pullulan polysaccharide, 10% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in the S2 is composed of a coupling agent 1 and a coupling agent 2 according to the mass ratio of 2: 1;
wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
in S3, the calcination process is divided into two successive stages, the first stage is calcination at 500 ℃ for 3 hours, and the second stage is calcination at 650 ℃ for 3 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Comparative example 1
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3% of pullulan polysaccharide, 5% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in the S2 is composed of a coupling agent 1 and a coupling agent 2 according to the mass ratio of 2: 1;
wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
in S3, the calcination process is divided into one stage, namely calcination at 600 ℃ for 6 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Comparative example 2
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3% of pullulan polysaccharide, 5% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in S2 is composed of coupling agent 1;
wherein, the structural formula of the coupling agent 1 is as follows:
in S3, the calcination process is divided into one stage, namely calcination at 600 ℃ for 6 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Comparative example 3
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3% of pullulan polysaccharide, 5% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
Wherein the coupling agent in S2 is composed of a coupling agent 2;
wherein, the structural formula of the coupling agent 2 is as follows:
in S3, the calcination process is divided into one stage, namely calcination at 600 ℃ for 6 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
Comparative example 4
A composite water quality treatment material for wastewater and sewage is prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, drying at constant temperature, roasting under the protection of nitrogen, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide; among them, the titania sol can be prepared by the method described in CN 104828916B.
S3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL, using 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3% of pullulan polysaccharide, 5% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water quality treatment material.
In S3, the calcination process is divided into one stage, namely calcination at 600 ℃ for 6 hours.
Wherein the particle size of the zeolite in S1 is 30 meshes, the concentration of hydrochloric acid solution is 0.1mol/L, the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours; in the S2, the ultrasonic time is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours; the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
The following table details the differences between the technical solutions of example 1 and comparative examples 1 to 4.
| Numbering | The kind and amount of the coupling agent in S2 | Calcination temperature and time of bentonite |
| Example 1 | Coupling agent 1: coupling agent 2 ═ 2:1 | 500℃3h+650℃3h |
| Comparative example 1 | Coupling agent 1: coupling agent 2 ═ 2:1 | 600℃6h |
| Comparative example 2 | Coupling agent 1 | 600℃6h |
| Comparative example 3 | Coupling agent 2 | 600℃6h |
| Comparative example 4 | —— | 600℃6h |
And (3) effect characterization: with CrCl3·6H2O is prepared into simulated chromium-containing wastewater to simulate Cr in the chromium-containing wastewater3+Taking 30ml of simulated chromium-containing wastewater with the mass concentration of 120mg/L, adding 1g of the composite water quality treatment material, stirring for 15min, standing for 30min, performing centrifugal separation, taking a proper amount of supernatant to measure residual Cr3+The content of Cr in the simulated chromium-containing wastewater is obtained by calculation3+The removal rate of (3). The results are as follows:
| numbering | Cr3+Removal rate |
| Example 1 | 99.1％ |
| Comparative example 1 | 98.0％ |
| Comparative example 2 | 96.3％ |
| Comparative example 3 | 95.7％ |
| Comparative example 4 | 92.8％ |
The above results show that (1) the present invention uses 1g of the water treatment material for Cr3+Treating 30ml of simulated chromium-containing wastewater with the mass concentration of 120mg/L to finally obtain Cr3+The removal rate is 99.1%, therefore, the invention can purify more waste water by using a water quality treatment material with less consumption and keep higher purification efficiency, which is superior to the prior art; (2) as can be seen from example 1 and comparative example 1, the surface characteristics of the bentonite can be optimized by reasonably optimizing the calcination temperature and the calcination time in the preparation process of the modified bentonite, which is helpful for removing interlayer adsorbed water and impurities in pores, reducing the adsorption resistance generated by a water film and impurities, and finally improving the adsorbability of the bentonite; (3) as can be seen from example 1 and comparative examples 2 to 4, the nano titanium dioxide is added during the process of loading the zeolite with the nano titanium dioxideThe loading effect of the nano titanium dioxide can be improved by adding the coupling agent, so that the nano titanium dioxide is more easily loaded on the zeolite to the maximum extent in the optimal nano state, and the adsorption and removal effects of the water quality treatment material are further improved.
Claims (7)
1. The composite water quality treatment material for wastewater and sewage is characterized by being prepared by the following steps:
pretreatment of S1 zeolite: putting zeolite into hydrochloric acid solution, stirring, standing and filtering; boiling the filtered zeolite in distilled water, cleaning with distilled water, baking the zeolite in an oven, and cooling for later use;
s2 preparation of zeolite-supported nano titanium dioxide: adding 10g of pretreated zeolite and 5g of coupling agent into 200mL of titanium dioxide sol, filtering by using a screen after ultrasonic treatment, standing, roasting under the protection of nitrogen after drying at constant temperature, naturally cooling to 100 ℃, stopping introducing nitrogen, cooling to room temperature, washing with distilled water, and drying to obtain zeolite-loaded nano titanium dioxide;
s3, placing bentonite in sulfuric acid for soaking, washing with distilled water, drying to constant weight, calcining, cooling to room temperature, and mixing the raw materials according to the weight ratio of 1 g: 10mL with 40% AlCl3Soaking the solution, filtering and drying to obtain modified bentonite;
s4, weighing the components according to the mass percentage of 3-5% of pullulan polysaccharide, 5-10% of zeolite loaded with nano titanium dioxide and the balance of modified bentonite, and uniformly mixing the components to obtain the composite water treatment material.
2. The composite type wastewater and sewage water quality treatment material according to claim 1, wherein the coupling agent in S2 is composed of coupling agent 1 and coupling agent 2 according to a mass ratio of 2: 1; wherein, the structural formula of the coupling agent 1 is as follows:
wherein, the structural formula of the coupling agent 2 is as follows:
3. the composite type wastewater and sewage water treatment material as claimed in claim 2, wherein the calcination process in S3 is divided into two successive stages, the first stage is calcination at 500 ℃ for 3 hours, and the second stage is calcination at 650 ℃ for 3 hours.
4. The composite water quality treatment material for wastewater and sewage as recited in claim 1, wherein the particle size of the zeolite in S1 is 30 meshes, and the concentration of the hydrochloric acid solution is 0.1 mol/L.
5. The composite water quality treatment material for wastewater and sewage according to claim 1, wherein the stirring time in S1 is 20min, the boiling time is 60min, the baking temperature is 100 ℃, and the baking time is 1.5 hours.
6. The composite water quality treatment material for wastewater and sewage as claimed in claim 1, wherein the ultrasonic treatment time in S2 is 2 hours, the drying temperature is 90 ℃, the roasting temperature is 500 ℃, and the roasting time is 2 hours.
7. The composite water quality treatment material for wastewater and sewage as recited in claim 1, wherein the concentration of sulfuric acid in S3 is 0.25mol/L, the soaking time is 2.5 hours, and the drying temperature is 90 ℃.
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