CN114949939B - Defoaming agent for landfill leachate evaporation and preparation method thereof - Google Patents
Defoaming agent for landfill leachate evaporation and preparation method thereof Download PDFInfo
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- CN114949939B CN114949939B CN202210479137.4A CN202210479137A CN114949939B CN 114949939 B CN114949939 B CN 114949939B CN 202210479137 A CN202210479137 A CN 202210479137A CN 114949939 B CN114949939 B CN 114949939B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- 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
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The application discloses a defoaming agent for landfill leachate evaporation and a preparation method thereof, and belongs to the technical field of defoaming agents. The defoamer comprises the following components in percentage by mass: 10 to 30 percent of polyether modified polysiloxane, 0.5 to 1.5 percent of thickening agent, 1 to 5 percent of corrosion and scale inhibitor, 1 to 4 percent of wetting agent, 6 to 10 percent of penetrating agent, 3 to 6 percent of solubilizer and 50 to 80 percent of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid. The defoamer prepared by compounding polyether modified polysiloxane, thickener, corrosion and scale inhibitor, wetting agent, penetrating agent and solubilizer has remarkable defoaming and foam inhibiting properties, and is beneficial to improving evaporation concentration multiple.
Description
Technical Field
The application belongs to the technical field of defoamers, and particularly relates to a defoamer for garbage leachate evaporation and a preparation method thereof.
Background
The landfill leachate is a large amount of wastewater generated by leaching in the landfill and stacking processes of the landfill, and is generated by free water, natural precipitation and organic matter decomposition contained in the landfill as well as surface water and underground water which permeate into the landfill. Because the components of the garbage are very complex, the produced garbage percolate is special wastewater with complex components, high organic matters, high ammonia nitrogen and high salt content, and the concentration of 1t percolate is approximately equal to the concentration of pollutants contained in 100t municipal sewage. The percolate, if discharged directly, can cause irreversible damage to the surrounding environment, in particular groundwater.
The percolate can be divided into young percolate (less than 5 years) and mature percolate (medium),Aged, 5-10 years, > 10 years respectively). The young percolate generally has a higher BOD 5 COD, biological treatment can obtain better effect, but the BOD of the middle-aged and old percolate 5 The COD is lower and the biodegradability is low. Therefore, the medium and old percolate is generally treated by an evaporation method, and the evaporation method is used for treating the percolate by using volatile components (such as micromolecular volatile organic matters and NH) in the wastewater 3 Etc.) and components (humic acid, fulvic acid, total Dissolved Solids (TDS), etc.) which are difficult to volatilize, and can achieve good treatment effects. Along with the wide application of the evaporation treatment process, the foam problem is increasingly prominent, and the stability of the liquid level in the evaporation tank and the quality of the effluent water can be affected due to the fact that the organic matter content of the percolate is complex and the foam is high in the evaporation process. The types of defoamers used in landfill leachate treatment are many, and although reports and applications of polyether defoamers and organic silicon defoamers are many at present, fewer defoamers suitable for landfill leachate evaporation treatment process are available.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide a defoaming agent for garbage leachate evaporation and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows: in a first aspect, a defoaming agent for landfill leachate evaporation is provided, which comprises the following components in percentage by mass: 10 to 30 percent of polyether modified polysiloxane, 0.5 to 1.5 percent of thickening agent, 1 to 5 percent of corrosion and scale inhibitor, 1 to 4 percent of wetting agent, 6 to 10 percent of penetrating agent, 3 to 6 percent of solubilizer and 50 to 80 percent of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid.
According to the characteristics of complex organic matter components, high temperature, multiple suspended matters and the like of the leachate in the process of evaporating the landfill leachate, the polyether modified polysiloxane compound defoamer is invented; the Si-C type self-emulsifying polyether modified polysiloxane is used, so that the high-temperature stability and acid-base stability of the defoamer can be improved, meanwhile, the self-emulsifying property of the defoamer is utilized, the problems that the silicone defoamer is poor in emulsification, silicone oil remains after high-temperature demulsification and is difficult to clean are avoided, meanwhile, the wetting agent, the penetrating agent, the solubilizer and the corrosion and scale inhibitor are compounded, the defoaming performance of the defoamer on landfill leachate is improved, the scale inhibition performance of the defoamer is improved, serious scaling of the landfill leachate in the high-temperature evaporation process is prevented, and the concentration multiple is improved. The polyepoxysuccinic acid or polyaspartic acid is selected as the corrosion and scale inhibitor, so that the scale inhibition performance of the defoamer is improved, and meanwhile, the polyepoxysuccinic acid or polyaspartic acid is combined with the polyether modified polysiloxane, so that the defoaming speed of the defoamer is improved. The components are matched with each other, so that the foam inhibition time, the foam inhibition speed and the scale inhibition performance of the foam inhibitor can be improved, and the concentration multiple can be improved.
Preferably, the defoamer comprises the following components in percentage by mass: 20-25% of polyether modified polysiloxane, 0.5-0.8% of thickener, 2-3% of corrosion and scale inhibitor, 2-3% of wetting agent, 5-8% of penetrating agent, 3-4% of solubilizer and the balance of deionized water. The inventor finds that the performance of the defoamer is better under the above proportion through research.
Preferably, the defoamer comprises the following components in percentage by mass: 25% of polyether modified polysiloxane, 0.6% of thickener, 3% of corrosion and scale inhibitor, 3% of wetting agent, 8% of penetrating agent, 4% of solubilizer and 56.4% of deionized water. Under the proportion, the defoaming time of the defoaming agent is shortest, the foam inhibition time is longest, the scale inhibition performance is excellent, and the effect of improving the evaporation concentration multiple is best.
Preferably, the solubilizer is glyceryl monostearate or glycerol dioleate, and the solubilizer is compounded with polyether modified polysiloxane, so that the dissolution effect of the defoamer on the landfill leachate can be improved, and the evaporation concentration multiple of the landfill leachate can be further improved.
Preferably, the penetrating agent is fatty alcohol polyoxyethylene ether or isomeric tridecanol polyoxyethylene ether, and the penetrating agent is compounded with polyether modified polysiloxane, so that the penetrating speed of the defoaming agent in a system is increased, the defoaming effect of the polyether modified polysiloxane is improved, the defoaming speed is improved, and meanwhile, the excellent dispersing effect is improved, and scaling is reduced.
Preferably, the wetting agent is polyoxyethylene oleate or polyoxyethylene stearate, the wetting agent increases the wetting performance of the defoamer, and is compounded with the polyether modified polysiloxane, so that the wetting performance of the defoamer in a system is increased, the acting time of the defoamer is shortened, the defoaming effect of the polyether modified polysiloxane is improved, the defoaming speed is improved, and meanwhile, the excellent dispersing effect is achieved, and scaling is reduced.
Preferably, the thickener is sodium carboxymethyl cellulose or carboxymethyl cellulose. Sodium carboxymethyl cellulose or carboxymethyl cellulose is used as a thickening agent, so that the stability of the defoamer emulsion in a complex organic matter system can be improved, and the defoamer is not easy to separate out in the complex organic matter system.
In a second aspect, there is provided a method of preparing an antifoaming agent comprising the steps of:
(1) Placing the thickener in water, heating and stirring to dissolve completely, and cooling to obtain thickener solution;
(2) Under stirring, regulating the pH value of the corrosion and scale inhibitor to be neutral by using sulfuric acid;
(3) Weighing the thickener solution obtained in the step (1), the corrosion and scale inhibitor obtained in the step (2), polyether modified polysiloxane, a wetting agent, a penetrating agent and a solubilizer according to a proportion, heating and stirring uniformly, and cooling to normal temperature to obtain the defoamer.
The preparation method of the defoamer can firstly carry out the step (2) and then carry out the step (1), and can also simultaneously carry out the step (1) and the step (2), the sequence of the step (1) and the step (2) has no influence on the preparation of the defoamer, and the sequence can be selected according to the requirement.
The corrosion and scale inhibitor used in the application is alkaline, so that the pH of the corrosion and scale inhibitor needs to be adjusted to be neutral in the process of preparing the defoamer in order to avoid the influence of the defoamer on the pH of a landfill leachate system.
Preferably, the heating temperature in the step (1) is 80 ℃, and the stirring time is 1h.
Preferably, the heating temperature in the step (1) is 50 ℃, and the stirring time is 1h.
Compared with the prior art, the application has the beneficial effects that: the defoamer prepared by compounding polyether modified polysiloxane, thickener, corrosion and scale inhibitor, penetrating agent, wetting agent and solubilizer has remarkable defoaming and foam inhibiting properties and improves evaporation concentration multiple.
Drawings
FIG. 1 is a landfill leachate stock solution;
FIG. 2 is a landfill leachate concentrated 20 times without defoamer;
FIG. 3 is a landfill leachate concentrated 20 times with the addition of the defoamer of example 3.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present application, the present application will be further described with reference to the following specific examples and the accompanying drawings.
Example 1
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.8% of sodium carboxymethyl cellulose, 2% of polyepoxysuccinic acid, 6% of isomeric trideceth polyoxyethylene ether, 3% of oleic acid polyoxyethylene ester, 2% of glyceryl monostearate and 66.2% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 1.2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 67 parts by weight of the thickener obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 2 parts by weight of polyepoxysuccinic acid obtained in the step (2), 2 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of polyoxyethylene oleate are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature and stood, and the defoamer is obtained.
Example 2
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.5% of sodium carboxymethyl cellulose, 4% of glyceryl monostearate, 3% of polyepoxysuccinic acid, 8% of isotridecyl alcohol polyoxyethylene ether, 3% of polyoxyethylene oleate and 61.5% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 0.8 part by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 63 parts by weight of the thickener obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 3 parts by weight of polyepoxysuccinic acid obtained in the step (2), 4 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of polyoxyethylene oleate are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature and stood, and the defoamer is obtained.
Example 3
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 25% of polyether modified polysiloxane, 0.6% of sodium carboxymethyl cellulose, 4% of glyceryl monostearate, 3% of polyepoxysuccinic acid, 8% of isotridecyl alcohol polyoxyethylene ether, 3% of polyoxyethylene oleate and 56.4% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 1 part by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 57 parts by weight of the thickener obtained in the step (1), 25 parts by weight of polyether modified polysiloxane, 3 parts by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of oleic acid polyoxyethylene ester are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature, and stood to obtain the defoamer.
Example 4
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 10% of polyether modified polysiloxane, 1.5% of sodium carboxymethyl cellulose, 3% of glyceryl monostearate, 2% of polyepoxysuccinic acid, 8% of isotridecyl alcohol polyoxyethylene ether, 2% of polyoxyethylene oleate and 73.5% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 73 parts by weight of the thickener obtained in the step (1), 10 parts by weight of polyether modified polysiloxane, 2 parts by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 8 parts by weight of isomeric tridecanol polyoxyethylene ether and 2 parts by weight of polyoxyethylene oleate are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature and stood, and the defoamer is obtained.
Example 5
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 30% of polyether modified polysiloxane, 0.5% of sodium carboxymethyl cellulose, 3% of glyceryl monostearate, 1% of polyepoxysuccinic acid, 6% of isotridecyl alcohol polyoxyethylene ether, 3% of polyoxyethylene oleate and 56.5% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 0.85 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 57 parts by weight of the thickener obtained in the step (1), 30 parts by weight of polyether modified polysiloxane, 1 part by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 3 parts by weight of polyoxyethylene oleate are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature and stood, and the defoamer is obtained.
Example 6
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 10% of polyether modified polysiloxane, 1.5% of sodium carboxymethyl cellulose, 6% of glyceryl monostearate, 5% of polyepoxysuccinic acid, 10% of isotridecyl alcohol polyoxyethylene ether, 1% of polyoxyethylene oleate and 66.5% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 2.2 parts by weight of sodium carboxymethyl cellulose, placing the sodium carboxymethyl cellulose in 100 parts by volume of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 68 parts by weight of the thickener obtained in the step (1), 10 parts by weight of polyether modified polysiloxane, 5 parts by weight of polyepoxysuccinic acid obtained in the step (2), 6 parts by weight of glyceryl monostearate, 10 parts by weight of isomeric tridecanol polyoxyethylene ether and 1 part by weight of oleic acid polyoxyethylene ester are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature and stood, and the defoamer is obtained.
Example 7
The embodiment provides a defoaming agent for landfill leachate evaporation, which comprises the following components in percentage by mass: 20% of polyether modified polysiloxane, 0.5% of sodium carboxymethyl cellulose, 3% of glyceryl monostearate, 1% of polyepoxysuccinic acid, 6% of isotridecyl alcohol polyoxyethylene ether, 4% of polyoxyethylene oleate and 66.5% of water.
The embodiment also provides a preparation method of the defoaming agent for landfill leachate evaporation, which comprises the following steps:
(1) Weighing 0.75 weight part of sodium carboxymethyl cellulose, placing in 100 volume parts of deionized water, stirring for 1h at 80 ℃ to completely dissolve the sodium carboxymethyl cellulose, and cooling to 50 ℃ to obtain a thickener solution;
(2) Adding sulfuric acid into polyepoxysuccinic acid under stirring, and adjusting the pH of the polyepoxysuccinic acid to be neutral;
(3) 66 parts by weight of the thickener obtained in the step (1), 20 parts by weight of polyether modified polysiloxane, 1 part by weight of polyepoxysuccinic acid obtained in the step (2), 3 parts by weight of glyceryl monostearate, 6 parts by weight of isomeric tridecanol polyoxyethylene ether and 4 parts by weight of oleic acid polyoxyethylene ester are weighed, stirred for 1h under the condition of 50 ℃ and the rotating speed of 80r/min, then cooled to normal temperature, and the defoamer is obtained after standing.
Effect example 1
The test method of each performance is as follows:
1. defoaming time and foam suppression time: taking 100mL of garbage percolate from a garbage factory in Zhongshan city, heating the garbage percolate in a graduated glass tube, putting the glass tube into a bubbling instrument for bubbling, adding 100ppm of defoaming agent to the foam height of 250mL, and recording the foam elimination time t1 as defoaming time; continuing bubbling until the foam height reaches 250mL again, and recording time t2, namely, bubble suppression time;
2. scale resistance: the method for measuring the scale inhibition performance of the GB/T16632-2008 water treatment agent comprises the following steps of;
the defoamers obtained in examples 1-7 were tested for performance using the methods described above and the test results are shown in Table 1.
TABLE 1
Note that: the commercial products in Table 1 are WF-SC132 high temperature defoamers from SiAnwei Frey environmental control technology Co., ltd.
From the test data in table 1, it is clear that the defoaming agent for landfill leachate evaporation of the present application has good defoaming and foam inhibition properties and good scale inhibition properties.
Effect example 2
The effect example examines the influence of the defoaming agent on the concentration multiple of the landfill leachate, and the following test is set, and the test adopts the example 3. The testing method comprises the following steps: taking 1000mL of landfill leachate stock solution, putting the stock solution into a 1000mL beaker, putting zeolite, heating the stock solution on an electric furnace until the residual liquid is 50mL, namely concentrating the stock solution by 20 times, comparing the effect of adding a test defoamer, and testing the results shown in figures 1-3.
Fig. 1 shows the stock solution of landfill leachate, fig. 2 shows the landfill leachate which is concentrated 20 times without the defoamer, and fig. 3 shows the landfill leachate which is concentrated 20 times with the defoamer of example 3. Comparing with figures 1-3, it can be known that the defoaming agent for landfill leachate evaporation has good solubilization property and good scale inhibition property, and can improve the evaporation concentration multiple of landfill leachate.
Effect example 3
The effect example examined the influence of the mass ratio of polyether-modified polysiloxane and solubilizing agent on the concentration multiple of landfill leachate, and test groups 1 to 5 were set, and the mass ratio of polyether-modified polysiloxane and solubilizing agent in test groups 1 to 5 was the same as in example 3 except that the mass ratio of polyether-modified polysiloxane and solubilizing agent was different from example 3, and the proportions of polyether-modified polysiloxane and solubilizing agent in test groups 1 to 3 were as shown in the following table 2.
The evaporation concentration multiple of the landfill leachate of the test group 1-5 is tested, and the test method is as follows: taking 1000mL of landfill leachate stock solution, putting zeolite into a 1000mL beaker, heating the beaker on an electric furnace until the residual liquid is different in volume, stopping the test when scaling occurs on the beaker, calculating the evaporation concentration multiple of the landfill leachate, wherein the volume in the beaker is the final volume of the landfill leachate, and the calculation formula is as follows: evaporation concentration fold = volume of landfill leachate stock/final volume of landfill leachate. The test results are shown in Table 2.
TABLE 2
As can be seen from table 2, when the total amount of polyether-modified polysiloxane and solubilizer added is the same, the mass ratio of polyether-modified polysiloxane and solubilizer has an effect on the evaporation concentration multiple of landfill leachate, and when the mass ratio of polyether-modified polysiloxane and solubilizer is 5: and 1, the evaporation concentration multiple of the landfill leachate is higher.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the application, and that those skilled in the art will understand that the technical scheme of the application may be modified or equally substituted without departing from the spirit and scope of the technical scheme of the application.
Claims (6)
1. The defoaming agent for landfill leachate evaporation is characterized by comprising the following components in percentage by mass: 10 to 30 percent of polyether modified polysiloxane, 0.5 to 1.5 percent of thickening agent, 1 to 5 percent of corrosion and scale inhibitor, 1 to 4 percent of wetting agent, 6 to 10 percent of penetrating agent, 3 to 6 percent of solubilizer and 50 to 80 percent of deionized water; the corrosion and scale inhibitor is polyepoxysuccinic acid or polyaspartic acid;
the solubilizer is glyceryl monostearate or glyceryl dioleate; the thickener is sodium carboxymethyl cellulose or carboxymethyl cellulose; the wetting agent is polyoxyethylene oleate or polyoxyethylene stearate; the penetrating agent is fatty alcohol polyoxyethylene ether or isomeric tridecanol polyoxyethylene ether; the mass ratio of the polyether modified polysiloxane to the solubilizer is 2.5:1, 5:1 or 7:1.
2. The defoamer of claim 1, comprising the following components in mass percent: 20-25% of polyether modified polysiloxane, 0.5-0.8% of thickener, 2-3% of corrosion and scale inhibitor, 2-3% of wetting agent, 5-8% of penetrating agent, 3-4% of solubilizer and the balance of deionized water.
3. The defoamer of claim 1, comprising the following components in mass percent: 25% of polyether modified polysiloxane, 0.6% of thickener, 3% of corrosion and scale inhibitor, 3% of wetting agent, 8% of penetrating agent, 4% of solubilizer and 56.4% of deionized water.
4. A process for the preparation of an antifoaming agent as claimed in any of claims 1 to 3 comprising the steps of:
(1) Placing the thickener in water, heating and stirring to dissolve completely, and cooling to obtain thickener solution;
(2) Under stirring, regulating the pH value of the corrosion and scale inhibitor to be neutral by using sulfuric acid;
(3) Weighing the thickener solution obtained in the step (1), the corrosion and scale inhibitor obtained in the step (2), polyether modified polysiloxane, a wetting agent, a penetrating agent and a solubilizer according to a proportion, heating and stirring uniformly, and cooling to normal temperature to obtain the defoamer.
5. The process of claim 4, wherein the heating in step (1) is carried out at 80℃for a period of 1 hour.
6. The process of claim 4, wherein the heating in step (1) is carried out at a temperature of 50℃for a period of 1 hour.
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