Method for producing chlorine-containing microbubbles and use thereof for removing trench sludge

Abstract

The application relates to a technical field of trench sludge treatment and disposal, in particular to a method for preparing chlorine-containing micro-bubbles and application of the chlorine-containing micro-bubbles in removing trench sludge. The application discloses a method for preparing chlorine-containing micro-bubbles, which comprises the following steps: introducing chlorine-sodium hypochlorite saturated solution into a sodium dodecyl benzene sulfonate-lauric sulfosuccinic acid monoester disodium solution to prepare chlorine-containing micro-bubbles. The surfactant is used as a film material of the micro-bubbles, and the prepared sodium dodecyl benzene sulfonate-lauric sulfosuccinic acid monoester disodium composite-based high-chlorine micro-bubbles have strong oxidation and stability, can effectively strip the organic flocculus attached to inorganic sand and gravel, and thus solve the problem that the inorganic sand and gravel of the trench sludge cannot be used for building materials due to the high ignition loss. In addition, the trench sludge is subjected to organic component stripping pretreatment, the existing trench sludge treatment process can be optimized, the treatment efficiency is improved, and the treatment cost load of the existing trench sludge treatment station is reduced.

Description

Technical Field

[0001] This specification relates to the field of sewage sludge treatment and disposal technology, and in particular to a method for preparing chlorine-containing microbubbles and its application in removing sewage sludge from drains. Background Technology

[0002] Sewage sludge is a type of sediment produced during the routine maintenance and dredging of urban sewage pipe networks. Its composition is complex and its sources are diverse. Besides particulate impurities entering the network with domestic and industrial wastewater, it also includes road dust, household garbage, and construction mud from urban development. Sewage sludge is typically black in appearance, with a moisture content generally between 80% and 95%. If not cleaned promptly, it can easily affect the drainage capacity of the pipes, causing problems such as poor drainage and sewage overflow during the flood season. Furthermore, sewage sludge deposited in the pipe network may also pollute rivers and lakes due to leaks in the pipe network.

[0003] The inorganic components in sewage sludge constitute a high proportion, mainly including stones, sand, and fine suspended solids. Currently, the main method used is hydraulic washing combined with cyclone screening to separate the components of the sludge according to different particle sizes, with the inorganic components used for further resource utilization. Although large-volume organic components in sewage sludge can be screened out using this technology, some organic components still form organic flocs that adhere to the sand and gravel, making further removal difficult. These organic flocs in sludge are typically formed by complex interactions between microorganisms and extracellular polymers, particulate organic matter, and inorganic substances through potential trapping. Currently, methods such as physical methods (ultrasonic cavitation, high temperature and high pressure), chemical methods (strong oxidizing agents), and biological methods (enzymatic hydrolysis) are used to alter the chemical structure and reduce the molecular weight of organic matter to destroy it. These methods are currently mainly applied to the dewatering treatment of municipal sludge, with limited research on their effectiveness in removing organic components from sewage sludge. The inability to effectively remove organic components adhering to inorganic sand and gravel is a major limiting factor hindering the further utilization of sewage sludge screening products in building materials. Summary of the Invention

[0004] To address the aforementioned problems, this application utilizes a high-speed shearing method to prepare highly oxidizing high-chlorine microbubbles coated with sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester. Treating drainage sludge with these high-chlorine microbubbles not only effectively kills microorganisms and bacteria in the sludge but also disrupts the intracellular polymers of organic flocs attached to inorganic sand and gravel, reducing floc particle size, irregularity, and surface potential trapping capacity. This improves the stripping efficiency of organic components and reduces the organic loss on ignition rate of inorganic components. Simultaneously, it reduces the content of novel pollutants such as polycyclic aromatic hydrocarbons in the organic components of the drainage sludge, providing pretreatment conditions for subsequent drainage sludge screening. This enables the further utilization and safe disposal of inorganic components in drainage sludge.

[0005] This application provides a method for preparing chlorine-containing microbubbles, comprising: passing chlorine gas into a saturated sodium hypochlorite solution of sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate to obtain chlorine-containing microbubbles.

[0006] This application also provides a method for removing organic components from sewage sludge, comprising introducing chlorine-containing microbubbles prepared by the above method into the sewage sludge, reacting, and sieving.

[0007] This application also provides the application of the above-mentioned preparation or removal methods in the following aspects: killing microorganisms and bacteria in drainage sludge; and / or, destroying the intracellular polymers of organic flocs attached to inorganic sand and gravel in drainage sludge, reducing the particle size of the flocs, reducing their irregularity, and changing their surface potential trapping ability; and / or, improving the stripping efficiency of organic components in drainage sludge; and / or, reducing the organic loss rate of inorganic components in drainage sludge.

[0008] The beneficial effects of this specification include, but are not limited to: This application uses a composite surfactant as the coating material for microbubbles, and the resulting sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate composite-based high-chlorine microbubbles possess strong oxidizing properties and high stability, effectively stripping organic flocs attached to inorganic sand and gravel. This solves the problem of the inorganic sand and gravel in drainage sludge being unusable as building materials due to high loss on ignition rates. Furthermore, pretreatment of drainage sludge by removing organic components optimizes existing drainage sludge treatment processes, improves treatment efficiency, and reduces the cost burden of existing drainage sludge treatment plants. Attached Figure Description

[0009] This application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, wherein:

[0010] Figure 1 This is a schematic diagram of the process flow according to some embodiments of this application. Detailed Implementation

[0011] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0012] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0013] Flowcharts are used in this specification to illustrate the operations performed by the system according to embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0014] This application provides a method for preparing chlorine-containing microbubbles, comprising: passing chlorine gas into a saturated sodium hypochlorite solution of sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate to obtain chlorine-containing microbubbles.

[0015] In some embodiments, the concentration of the solute in the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution can be 20% to 40% (w / v). For example, the concentration of the solute in the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution can be about 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, or 40% (w / v). Any range characterized by combinations of the above values ​​is also included, which will not be elaborated here. In some embodiments, preferably, the concentration of the solute in the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution can be 20% (w / v).

[0016] In some embodiments, the solute may include sodium dodecylbenzenesulfonate and disodium lauryl sulfonate monoester. Preferably, in some embodiments, the mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester may be 2:1 to 4:1. For example, the mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester may be approximately 2:1, 3:1, or 4:1. Any range characterized by combinations of the above end values ​​is also included, and will not be elaborated here. In some embodiments, more preferably, the mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester may be 2:1.

[0017] In some embodiments, the chlorine-sodium hypochlorite saturated solution can be prepared by passing chlorine gas through a sodium hypochlorite saturated solution. Preferably, in some embodiments, 10 to 50 L of chlorine gas can be passed through each liter of sodium hypochlorite saturated solution. For example, the amount of chlorine gas passed through each liter of sodium hypochlorite saturated solution can be approximately 10, 15, 20, 25, 30, 35, 40, 45, or 50 L. Any range characterized by combinations of the above values ​​is also included, and will not be elaborated further here.

[0018] In some embodiments, more preferably, the chlorine gas introduction time can be 2 to 4 minutes. For example, the chlorine gas introduction time can be approximately 2, 2.5, 3, 3.5, or 4 minutes. Any range characterized by combinations of the above values ​​is also included, which will not be elaborated here. In some embodiments, more preferably, the chlorine gas introduction flow rate can be 300 to 500 L / min. For example, the chlorine gas introduction flow rate can be approximately 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, or 500 L / min. Any range characterized by combinations of the above values ​​is also included, which will not be elaborated here.

[0019] In some embodiments, the specific preparation steps of the chlorine-containing microbubbles are as follows: After passing chlorine gas and a saturated sodium hypochlorite solution into the sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate solution for 15-30 seconds, the shearing head is turned on, the shearing speed is 24000 r / min-30000 r / min, and the shearing time is 2-4 minutes. For example, the shearing speed can be approximately 24000, 25000, 26000, 27000, 28000, 29000, or 30000 r / min, and the shearing time can be approximately 2, 2.5, 3, 3.5, or 4 minutes. Any range characterized by combinations of the above values ​​is also included, which will not be elaborated here.

[0020] In some embodiments, the volume ratio of the sodium dodecylbenzenesulfonate-lauryl sulfosuccinate monoester disodium solution to the chlorine-sodium hypochlorite saturated solution can be (1:5) to (1:10). In some embodiments, the volume ratio of the sodium dodecylbenzenesulfonate solution to the chlorine-sodium hypochlorite saturated solution can be (1:6) to (1:9). In some embodiments, the volume ratio of the sodium dodecylbenzenesulfonate solution to the chlorine-sodium hypochlorite saturated solution can be (1:7) to (1:8).

[0021] In some embodiments, the chlorine-containing microbubbles may use a sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate monoester composite as the coating material.

[0022] In some embodiments, the diameter of the chlorine-containing microbubbles may be less than 7 micrometers.

[0023] This application also provides a method for removing organic components from sewage sludge, comprising introducing chlorine-containing microbubbles prepared by the above preparation method into the sewage sludge, reacting, and sieving.

[0024] In some embodiments, the drain sludge can be drain sludge after removing bulky materials. Preferably, in some embodiments, the drain sludge can be used to remove bulky materials through a screen. In some embodiments, the bulky materials can be coarse materials such as stones or garbage. More preferably, in some embodiments, the aperture of the screen can be 80–120 mm. For example, the aperture of the screen can be approximately 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, or 120 mm. Any range characterized by combinations of the above values ​​is also included, which will not be elaborated here. In some embodiments, more preferably, the aperture of the screen can be 100 mm.

[0025] In some embodiments, the bulk material may be a material with a diameter ≥ 100 mm.

[0026] In some embodiments, the reaction temperature can be 20–30°C. For example, the reaction temperature can be approximately 20, 22, 24, 26, 28, or 30°C. Any range characterized by combinations of the above values ​​is also included, and will not be elaborated further here. In some embodiments, the reaction time is 40–50 min. For example, the reaction time can be approximately 40, 42, 44, 46, 48, or 50 min. Any range characterized by combinations of the above values ​​is also included, and will not be elaborated further here. In some embodiments, preferably, the reaction temperature is 25°C; in some embodiments, preferably, the reaction time is 40 min.

[0027] In some embodiments, 4L of chlorine-containing microbubbles may be introduced into each kilogram of ditch sludge.

[0028] This application also provides the application of the above-mentioned preparation or removal methods in the following aspects: killing microorganisms and bacteria in drainage sludge; and / or, destroying the intracellular polymers of organic flocs attached to inorganic sand and gravel in drainage sludge, reducing the particle size of the flocs, reducing their irregularity, and changing their surface potential trapping ability; and / or, improving the stripping efficiency of organic components in drainage sludge; and / or, reducing the organic loss rate of inorganic components in drainage sludge.

[0029] This application is simple to operate, produces small and dense bubbles with a long duration, and can effectively solve the problem that organic components attached to inorganic sand and gravel are difficult to remove during conventional sludge screening, which affects subsequent resource utilization. After treating sludge with the prepared microbubbles, the inorganic component loss rate is low, indicating a good removal effect.

[0030] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the experimental materials used in the following examples were all purchased from conventional biochemical reagent companies. All quantitative experiments in the following examples were performed in triplicate, and the results were averaged.

[0031] Example 1 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0032] Sodium dodecylbenzenesulfonate and disodium lauryl sulfonate monoester (mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester is 4:1) were weighed and dissolved in water. The solution was stirred at 30°C for 5 minutes to prepare a 20% sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution. Chlorine gas was passed into a saturated sodium hypochlorite solution at a rate of 300 L / min for 2 minutes. 10 L of chlorine gas was passed into each liter of the saturated sodium hypochlorite solution to prepare a chlorine-sodium hypochlorite saturated solution. A shearing blade was inserted below the surface of the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution, and chlorine-sodium hypochlorite saturated solution was passed through for 15 seconds. (The solution of sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester and chlorine-sodium hypochlorite saturated solution were then dissolved.) With a volume ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfosuccinate monoester as the coating material, high-chlorine microbubbles were prepared by turning on the shearing head, setting the shearing speed to 24000 r / min and the shearing time to 2 min. Detection using a Coulter counter revealed that approximately 60% of the microbubbles had a diameter less than 7 micrometers. After removing large-volume materials such as stones and garbage from the sewage sludge from the drainage ditches of Lu'an City through a 100 mm sieve, the prepared microbubbles were introduced. 4 L of chlorine-containing microbubbles were introduced per kilogram of drainage sludge, and the reaction was carried out at 25℃ for 40 min before entering a conventional sieving system. The sorted medium and coarse sand was tested for loss on ignition and 16 polycyclic aromatic hydrocarbons (PAHs). Under these conditions, the organic loss on ignition was 1.2%, and the total PAH content was 216 ng / kg.

[0033] The 16 polycyclic aromatic hydrocarbons are: Naphthalene, Acenaphthylene, Acenaphthene, Fluorene, Phenanthrene, Anthracene, Fluoranthene, Pyrene, Benzo(a)anthracene, Chrysene, Benzo(b)fluoranthene, Benzo(k)fluoranthene, Benzo(a)pyrene, Dibenzo(a,h)anthracene, Indeno(1,2,3-cd)pyrene, and Benzo(g,hi)perylene.

[0034] Example 2 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0035] Sodium dodecylbenzenesulfonate and disodium lauryl sulfonate monoester (mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester is 2:1) were weighed and dissolved in water. The solution was stirred at 30°C for 10 min to prepare a 30% sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution. Chlorine gas was passed into a saturated sodium hypochlorite solution at a rate of 400 L / min for 3 min. 50 L of chlorine gas was passed into each liter of the saturated sodium hypochlorite solution to prepare a chlorine-sodium hypochlorite saturated solution. A shearing blade was inserted below the surface of the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution, and chlorine-sodium hypochlorite saturated solution was passed through for 20 s. The solution volume ratio was 1:7.5. The shearing head was turned on, the shearing speed was set to 26000 r / min, and the shearing time was set to 3 min. High-chlorine microbubbles were prepared using sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate monoester as the coating material. Detection using a Coulter counter revealed that approximately 77% of the microbubbles had a diameter less than 7 micrometers. After removing large-volume materials such as stones and garbage from the drainage sludge in Lu'an City through a 100 mm sieve, the prepared microbubbles were introduced. 4 L of chlorine-containing microbubbles were introduced per kilogram of drainage sludge. The reaction was carried out at 25℃ for 45 min, and then the mixture was fed into a conventional sieving system. The sorted medium and coarse sand was tested for loss on ignition and 16 polycyclic aromatic hydrocarbons (PAHs). Under these conditions, the organic loss on ignition rate was 0.9%, and the total PAH content was 96 ng / kg.

[0036] Example 3 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0037] Sodium dodecylbenzenesulfonate and disodium lauryl sulfonate monoester (mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester is 2:1) were weighed and dissolved in water. The solution was stirred at 35°C for 10 min to prepare a 40% sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution. Chlorine gas was passed into a saturated sodium hypochlorite solution at a rate of 500 L / min for 4 min. 25 L of chlorine gas was passed into each liter of the saturated sodium hypochlorite solution to prepare a chlorine-sodium hypochlorite saturated solution. A shearing blade was inserted below the surface of the sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester solution, and chlorine-sodium hypochlorite saturated solution was passed through for 30 s. (The solution of sodium dodecylbenzenesulfonate-disodium lauryl sulfonate monoester and chlorine-sodium hypochlorite saturated solution were then passed through.) The volume ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfonate monoester was 1:10. The shearing head was turned on, the shearing speed was set to 30,000 r / min, and the shearing time was set to 4 min. High-chlorine microbubbles were prepared with sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate monoester as the coating material. The results showed that about 80% of the microbubbles had a diameter of less than 7 micrometers. After removing stones, garbage and other large-volume materials from the sewage sludge in the urban area of ​​Lu'an City through a 100 mm sieve, the prepared microbubbles were introduced. 4 L of chlorine-containing microbubbles were introduced into each kilogram of sewage sludge. The reaction was carried out at 30℃ for 50 min and then entered a conventional sieving system. The loss on ignition rate and 16 kinds of polycyclic aromatic hydrocarbons were tested on the sorted medium and coarse sand. Under these conditions, the organic loss on ignition rate was 0.9%, and the total amount of polycyclic aromatic hydrocarbons was 108 ng / kg.

[0038] Example 4 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0039] After removing large-volume materials such as stones and garbage by passing the sludge from the drainage ditches in Lu'an City through a 100mm screen, it was not subjected to microbubble treatment before entering the conventional screening system. The medium and coarse sand after sorting was tested for loss on ignition and 16 kinds of polycyclic aromatic hydrocarbons. Under these conditions, the organic loss on ignition rate was 5.3% and the total amount of polycyclic aromatic hydrocarbons was 1105ng / kg.

[0040] Example 5 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0041] Chlorine gas was introduced into a saturated sodium hypochlorite solution at a rate of 500 L / min for 4 min. The cutting speed of the cutter head was set to 30,000 r / min and the cutting time was set to 4 min. Other preparation and usage conditions were the same as in Example 2. High-chlorine microbubbles were prepared using sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate monoester as the coating material. The results, measured by a Coulter counter, showed that approximately 83% of the microbubbles had a diameter of less than 7 micrometers. The organic loss on ignition rate of the sorted medium and coarse sand was 0.8%, and the total amount of polycyclic aromatic hydrocarbons was 56 ng / kg.

[0042] Example 6 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0043] Sodium dodecylbenzenesulfonate was dissolved in water and stirred at 30°C for 10 min to prepare a 15% sodium dodecylbenzenesulfonate solution. Chlorine gas was passed into a saturated sodium hypochlorite solution at a rate of 400 L / min for 3 min, with 50 L of chlorine gas passed into each liter of the saturated sodium hypochlorite solution to prepare a chlorine-sodium hypochlorite saturated solution. The shearing head was inserted below the surface of the sodium dodecylbenzenesulfonate solution, and the chlorine-sodium hypochlorite saturated solution was passed through for 20 s (the volume ratio of sodium dodecylbenzenesulfonate solution to chlorine-sodium hypochlorite saturated solution was 1:7.5). The shearing head was then turned on, and the shearing speed was set to 26000 r / min. High-chlorine microbubbles were prepared by setting the shearing time to 3 minutes and using sodium dodecylbenzenesulfonate as the coating material. Detection using a Coulter counter revealed that approximately 82% of the microbubbles had a diameter of less than 7 micrometers. Sludge from urban drainage ditches in Lu'an City was passed through a 100mm sieve to remove large-volume materials such as stones and garbage before being introduced into the prepared microbubbles. 4L of chlorine-containing microbubbles were introduced per kilogram of drainage sludge, and the reaction was carried out at 25℃ for 45 minutes before entering a conventional sieving system. The sorted medium and coarse sand was then tested for loss on ignition and 16 types of polycyclic aromatic hydrocarbons (PAHs). Under these conditions, the organic loss on ignition rate was 2.2%, and the total PAH content was 270 ng / kg.

[0044] Example 7 - A method for preparing and using microbubbles to remove organic components from sewage sludge.

[0045] Disodium lauryl sulfosuccinate was dissolved in water and stirred at 30°C for 10 min to prepare a 15% sodium dodecylbenzenesulfonate solution. Chlorine gas was passed into a saturated sodium hypochlorite solution at a rate of 400 L / min for 3 min, with 50 L of chlorine gas passed into each liter of the saturated sodium hypochlorite solution to prepare a chlorine-sodium hypochlorite saturated solution. The shearing head was inserted below the surface of the sodium dodecylbenzenesulfonate solution, and the chlorine-sodium hypochlorite saturated solution was passed through for 20 s (the volume ratio of sodium dodecylbenzenesulfonate solution to chlorine-sodium hypochlorite saturated solution was 1:7.5). The shearing head was then turned on, and the shearing speed was set to 26000. High-chlorine microbubbles were prepared using sodium dodecylbenzenesulfonate as the coating material at a shearing rate of r / min and a shearing time of 3 min. Detection using a Coulter counter revealed that approximately 79% of the microbubbles had a diameter of less than 7 micrometers. Sludge from urban drainage ditches in Lu'an City was passed through a 100 mm sieve to remove large-volume materials such as stones and garbage before being introduced into the prepared microbubbles. 4 L of chlorine-containing microbubbles were introduced per kilogram of drainage sludge, and the reaction was carried out at 25℃ for 45 min before entering a conventional sieving system. The sorted medium and coarse sand was then tested for loss on ignition and 16 types of polycyclic aromatic hydrocarbons (PAHs). Under these conditions, the organic loss on ignition rate was 2.4%, and the total PAH content was 250 ng / kg.

[0046] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0047] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0048] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this specification are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0049] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A method for preparing chlorine-containing microbubbles, comprising: Chlorine-containing microbubbles were prepared by passing chlorine gas into a sodium dodecylbenzene sulfonate-disodium lauryl sulfosuccinate solution and a saturated sodium hypochlorite solution. The specific preparation steps of the chlorine-containing microbubbles are as follows: the shearing head is inserted below the surface of the sodium dodecylbenzenesulfonate-lauryl sulfonated succinate disodium solution. After chlorine gas and sodium hypochlorite saturated solution are introduced into the sodium dodecylbenzenesulfonate-lauryl sulfonated succinate disodium solution for 15s to 30s, the shearing head is turned on. The shearing speed is 24000r / min to 30000r / min, and the shearing time is 2 to 4min. The concentration of the solute in the sodium dodecylbenzenesulfonate-lauryl sulfosuccinate disodium solution is 20%–40% (w / v). In the solute, the mass ratio of sodium dodecylbenzenesulfonate to disodium lauryl sulfosuccinate monoester is 2:1 to 4:1; The volume ratio of the sodium dodecylbenzenesulfonate-lauryl sulfonate monoester disodium solution to the chlorine-sodium hypochlorite saturated solution is (1:5) to (1:10). The chlorine-containing microbubbles are coated with sodium dodecylbenzenesulfonate-disodium lauryl sulfosuccinate monoester as the coating material.

2. The preparation method according to claim 1, characterized in that, The concentration of the solute in the sodium dodecylbenzenesulfonate-lauryl sulfosuccinate monosodium solution is 20% (w / v).

3. The preparation method according to claim 1, characterized in that, The chlorine-sodium hypochlorite saturated solution is prepared by passing chlorine gas into a sodium hypochlorite saturated solution.

4. The preparation method according to claim 3, characterized in that, 10–50 L of chlorine gas is passed through each liter of saturated sodium hypochlorite solution.

5. The preparation method according to claim 3, characterized in that, The chlorine gas is introduced for 2 to 4 minutes.

6. The preparation method according to claim 3, characterized in that, The chlorine gas flow rate is 300-500 L / min.

7. The preparation method according to claim 1, characterized in that, The diameter of the chlorine-containing microbubbles is less than 7 micrometers.

8. A method for removing organic components from sewage sludge, comprising introducing chlorine-containing microbubbles prepared by the preparation method according to any one of claims 1 to 7 into the sewage sludge, reacting, and then sieving.

9. The removal method as described in claim 8, characterized in that, The drain sludge is the drain sludge after removing large-volume materials.

10. The removal method as described in claim 8, characterized in that, The sludge from the drainage ditch is sieved to remove large volumes of material.

11. The removal method as described in claim 10, characterized in that, The mesh size of the screen is 80–120 mm.

12. The removal method as described in claim 10, characterized in that, The mesh size of the screen is 100 mm.

13. The removal method as described in claim 9, characterized in that, The large-volume material refers to a material with a diameter ≥ 100 mm.

14. The removal method as described in claim 8, characterized in that, The reaction temperature is 20–30°C, and the reaction time is 40–50 min. And / or, introduce 4L of chlorine-containing microbubbles into each kilogram of sludge in the drainage ditch.

15. The removal method as described in claim 8, characterized in that, The reaction temperature was 25°C and the reaction time was 40 min.

16. The application of the preparation method according to any one of claims 1 to 7 or the removal method according to any one of claims 8 to 15 in the following aspects: Kill microorganisms and bacteria in the sludge from the drainage ditch; And / or, disrupt the intracellular polymers of organic flocs attached to inorganic sand and gravel in the sludge of the drainage ditch, reduce the particle size of the flocs, reduce their irregularity, and change their surface potential trapping ability. And / or, improve the stripping efficiency of organic components in sewage sludge from drainage ditches; And / or, reduce the organic loss on ignition rate of inorganic components in sludge from drainage ditches.

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