CN115261025A - Recovery system and method for excess sludge treated by high-megahertz electromagnetic waves - Google Patents
Recovery system and method for excess sludge treated by high-megahertz electromagnetic waves Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/20—Vinyl polymers
- C09K17/22—Polyacrylates; Polymethacrylates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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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
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a recovery system and a recovery method for excess sludge treated by high megahertz electromagnetic waves, wherein the method comprises the following steps: adding NaOH and C into a constant-temperature water bath heating reactor 3 H 4 O 2 Solution of formed of C 3 H 4 O 2 And C 3 H 4 O 2 A reaction solution composed of a salt solution;adding C 3 H 5 NO is mixed and stirred; addition (NH) 4 ) 2 S 2 O 8 The solution is stirred and reacts for a period of time; after the reaction is finished, C is added 7 H 10 N 2 O 2 Stirring the solution; treating the residual sludge by high-megahertz electromagnetic waves for a period of time, then adding the treated residual sludge into a constant-temperature water bath heating reactor, reacting for a period of time and adjusting the pH value of the mixed solution; and conveying the mixed solution to a drying oven for drying and forming to obtain the soil conditioner. The invention utilizes the surplus sludge of the domestic sewage plant after being radiated by the high megahertz electromagnetic wave to produce the soil conditioner with high water absorption and high water supply property as the framework, thereby realizing the resource recycling of the surplus sludge of the domestic sewage plant.
Description
Technical Field
The invention relates to the technical field of town sewage treatment, in particular to a system and a method for recovering excess sludge through high megahertz electromagnetic wave treatment.
Background
A soil amendment is a substance mainly used to improve the physical, chemical and biological properties of soil to make it more suitable for plant growth. The traditional soil improvement method, such as adding sandy soil into clay, adding loam into sandy soil and the like, can be called as a natural soil conditioner. At present, organic extracts, natural minerals or artificial high molecular polymers are mostly adopted to synthesize soil conditioners.
The artificial high molecular polymer synthetic soil conditioner is the most applied means at present. The artificially synthesized soil conditioner for domestic and foreign research and application includes Polyacrylamide (PAM), polyvinyl alcohol resin, polyethylene glycol, urea resin, etc. Wherein PAM is the most concerned artificially synthesized soil sample conditioner of researchers, and the artificially synthesized soil conditioner is characterized in that: has a high water-absorbing function of absorbing water several hundred to several thousand times the weight of itself, and is excellent in water-retaining property, and when once water is swollen to form hydrogel, it is difficult to separate water even when pressurized. The artificially synthesized soil modifier is a functional high-molecular material with lots of hydrophilic groups, and its main chain or grafted side chain contains strong hydrophilic functional groups of carboxyl group and hydroxyl group, etc. according to its chemical structureThe affinity of the hydrophilic group with water is the most important factor for its water absorption; from the physical structure, to realize high water absorption, the resin must be a three-dimensional network with low crosslinking degree, and the skeleton of the network can be natural polymers such as starch and fiber, and can also be synthetic resin (such as poly C) 3 H 4 O 2 Class); from the microstructure, the microstructure of the artificially synthesized soil conditioner is also diversified due to different synthetic systems. The artificially synthesized soil conditioner has extremely strong liquid retention property, is non-toxic and non-irritant, does not react with human skin after contacting with the human skin, and does not have great influence on the environment, so the artificially synthesized soil conditioner has very wide application, and covers the industries of medical sanitation, industry, agriculture, building and the like. Wherein, the medical health comprises products such as ice bags, sanitary towels and the like, and industrial agents such as water-soluble paint, thickening agent and the like exist in the industry; in addition, the vegetable preservative can also be used as a vegetable preservative in agriculture. The traditional artificially synthesized soil conditioner is generally a pure petroleum-based product, and with the increasing exhaustion of petroleum resources and the rising of petroleum price, in order to reduce the production cost of the artificially synthesized soil conditioner, ensure the sustainability of the supply of production raw materials and improve the application performance of the product, people add bio-based raw materials or inorganic minerals into the traditional petroleum-based raw materials for copolymerization or blending to prepare the artificially synthesized soil conditioner.
With the development of industry and cities, the yield of residual sludge in domestic sewage plants is increasing. As the 'heavy water and light mud' for a long time in China, the treatment and the disposal of the excess sludge are not synchronously promoted with the sewage treatment, the problem of the treatment and the disposal of the excess sludge is not effectively solved, and the situation is very severe. The excess sludge of the domestic sewage plant is a potential resource with utilization value, and the disposal mode mainly comprises the following steps: anaerobic fermentation, sanitary landfill, aerobic composting, natural drying, incineration, power generation and the like. The sanitary landfill and the incineration power generation are the main treatment modes for treating the dewatered excess sludge at present, and the two treatment modes have the characteristic of large investment capital.
The surface of the excess sludge of the domestic sewage plant contains a large number of groups such as hydroxyl, carboxyl and the like, which is an excellent matrix raw material for preparing the artificially synthesized soil conditioner, so that the resource recycling of the excess sludge can be realized, and the major problem of treatment and disposal of the excess sludge is solved. At present, no relevant literature report that the excess sludge of the domestic sewage plant is used for preparing the artificially synthesized soil conditioner exists.
Disclosure of Invention
The invention aims to provide a recovery system and a recovery method for treating excess sludge by using high-megahertz electromagnetic waves, which solve the problem of resource recycling of the excess sludge in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for recovering excess sludge from high megahertz electromagnetic wave treatment, comprising the steps of:
(1) Adding NaOH with the mass of X and C with the mass of Y into a constant-temperature water bath heating reactor 3 H 4 O 2 Solution of C forming a degree of neutralization 3 H 4 O 2 And C 3 H 4 O 2 A reaction solution composed of a salt solution;
(2) C with the mass of Z is added into the constant-temperature water bath heating reactor 3 H 5 NO is mixed and stirred;
(3) With mass W of (NH) 4 ) 2 S 2 O 8 Adding the solution into a constant-temperature water bath heating reactor, and stirring for reacting for a period of time;
(4) After the reaction is finished, adding C with the mass of V 7 H 10 N 2 O 2 Adding the solution into a constant-temperature water bath heating reactor for stirring;
(5) Adding the residual sludge with the mass A into a high megahertz electromagnetic wave treatment chamber to carry out high megahertz electromagnetic wave treatment for a period of time, then adding the sludge into a constant-temperature water bath to heat a reactor, reacting for a period of time and adjusting the pH of a mixed solution obtained after the reaction;
(6) And finally, conveying the mixed solution to a drying oven for drying and forming to obtain the soil conditioner.
The invention utilizes the surplus sludge of the domestic sewage plant after being radiated by the high megahertz electromagnetic wave to produce the soil conditioner with high water absorption and high water supply property as the framework, thereby realizing the resource recycling of the surplus sludge of the domestic sewage plant.
On the first hand, the residual sludge after being radiated by the high megahertz electromagnetic wave is selected as the main matrix of the soil conditioner, and the residual sludge contains a large amount of hydroxyl, carboxyl and other groups which are used as the main components of the matrix, thereby increasing the hydrophilic performance of the soil conditioner; in the second aspect, the residual sludge after being radiated by the high-megahertz electromagnetic wave can improve the air permeability of the matrix, and the prepared soil conditioner can slowly release a large amount of water required by the growth of plants; in the third aspect, the residual sludge after being treated by the high-megahertz electromagnetic wave radiation is selected as a main substrate of the soil conditioner, and the substrate contains a large amount of trace elements necessary for plant growth, so that harmful germs on the roots of plants can be adsorbed, and the incidence rate of the plants is reduced.
In some specific technical schemes, the temperature of the thermostatic waterbath heating reactor is controlled to be 40-45 ℃.
In some specific technical schemes, the mass of each raw material satisfies the following relational expression: x is more than or equal to 0.278Y and less than or equal to 0.445Y, Z is more than or equal to 0.01Y and less than or equal to 0.1Y, W is more than or equal to 0.002Y and less than or equal to 0.025Y, V is more than or equal to 0.001Y and less than or equal to 0.04Y, and A is more than or equal to 0.3Y and less than or equal to 0.7Y.
In some specific embodiments, in step (1), the compound formed is C 3 H 4 O 2 And C 3 H 4 O 2 The neutralization degree of the reaction solution formed by the salt solution is 50-80%.
In some specific technical schemes, in the step (3), the stirring reaction time is 0.5h.
In some specific technical solutions, in the step (5), the frequency of the high megahertz electromagnetic wave is 915 megahertz, and the processing time of the high megahertz electromagnetic wave is 4min.
In some specific technical schemes, in the step (5), the residual sludge treated by the high megahertz electromagnetic wave radiation is added into a constant temperature water bath heating reactor for reaction for 2 to 3 hours.
In some specific technical schemes, in the step (5), the pH of the mixed solution is adjusted by NaOH and C 3 H 4 O 2 The addition of the solution is controlled, and the pH range is 4.5-5.5.
In some specific technical schemes, in the step (6), the drying temperature of the drying oven is 80-95 ℃, and the drying treatment time of the mixed solution in the drying oven is 12-24 h.
In a second aspect, the present invention further provides a high mhz electromagnetic wave processing surplus sludge recycling system, which is used for implementing the above high mhz electromagnetic wave processing surplus sludge recycling method and preparing a soil conditioner, and includes:
a constant temperature water bath heating reactor, the top of which is provided with a feed inlet, the bottom of the constant-temperature water bath heating reactor is provided with a discharge hole, and the constant-temperature water bath heating reactor is also provided with a pH meter, a thermometer and a stirrer;
the storage system comprises a NaOH material bin and a NaOH material bin, wherein the NaOH material bin and the NaOH material bin are respectively connected with the feeding hole through pipelines 3 H 5 NO Material storehouse, C 3 H 4 O 2 Solution storage tank, (NH) 4 ) 2 S 2 O 8 Solution storage tank and C 7 H 10 N 2 O 2 A solution storage tank; the pipeline connected with the NaOH material bin is provided with a first powder batch feeder and a first powder batch feeder C 3 H 5 The pipeline connected with the NO material bin is provided with a second powder batch feeder and C 3 H 4 O 2 The pipeline connected with the solution storage tank is provided with a first metering pump and (NH) 4 ) 2 S 2 O 8 The pipeline connected with the solution storage tank is provided with a second metering pump connected with the pump C 7 H 10 N 2 O 2 A peristaltic pump is arranged on a pipeline connected with the solution storage tank;
the system comprises a surplus sludge pretreatment system, a sludge storage bin and a high-megahertz electromagnetic wave treatment chamber, wherein the high-megahertz electromagnetic wave treatment chamber generates electromagnetic waves with certain frequency inside, a surplus sludge conveying belt capable of conveying surplus sludge to a feeding hole is arranged in the high-megahertz electromagnetic wave treatment chamber, and the surplus sludge storage bin is connected to the surplus sludge conveying belt through a powder feeding machine;
the drying system comprises a drying box connected with the discharge port through a pipeline; and a third metering pump is arranged on a pipeline connected with the drying box.
Compared with the prior art, the invention provides a system and a method for treating and recovering excess sludge by using high megahertz electromagnetic waves, which have the following beneficial effects:
the invention utilizes the surplus sludge of the domestic sewage plant after being radiated by the high megahertz electromagnetic wave as a framework to produce and prepare the functional polymer material soil conditioner with a three-dimensional cross-linked network structure, which has multiple hydrophilic groups and proper cross-linking or partial crystallization, has higher gel strength, high water absorption and slow and continuous water release properties, has good water absorption and water retention performance, and can improve the water retention and heat preservation performance of soil by combining with the soil, thereby improving the yield of crops and saving irrigation water; meanwhile, the method has the potential of reducing the plant diseases and is beneficial to the growth of plants. Because the excess sludge is derived from organisms, has the advantages of reproducibility, waste utilization, energy conservation and environmental protection, the material synthesized by taking the excess sludge as the chemical raw material is superior to common petroleum-based products in the aspect of environmental compatibility, and has good application prospect.
In addition, the method is easy to operate, the process is simple, the industrial and agricultural wastes are greatly utilized as raw materials, the concept of 'treating wastes with wastes against one another' is met, and the method has high practical value and application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph showing the change of the moisture content of the soil without plants;
FIG. 3 is a diagram showing the change of water content of soil with plants;
FIG. 4 is a plant height variation diagram of a Chinese rose plant.
Reference numerals: 101. a residual sludge material bin; 102. NaOH material bin; 103.C 3 H 5 an NO material bin; 104. c 3 H 4 O 2 A solution storage tank; 105. (NH) 4 ) 2 S 2 O 8 A solution storage tank; 106. c 7 H 10 N 2 O 2 A solution storage tank; 201. a powder feeder; 202. a residual sludge conveyer belt; 203. a first powder batch feeder; 204. a second powder batch feeder; 205. a first metering pump; 206. a second metering pump; 207. a peristaltic pump; 208. a third metering pump; 301. a high megahertz electromagnetic wave processing chamber; 302. a drying oven; 401. heating the reactor in a constant-temperature water bath; 402. a stirrer; 403. a pH meter; 404. a thermometer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the embodiment provides a high megahertz electromagnetic wave treatment excess sludge recycling system, which is used for recycling excess sludge of a domestic sewage plant to prepare a soil conditioner, wherein the obtained soil conditioner has the characteristics of high water absorption and high water supply, so that the resource recycling of the excess sludge of the domestic sewage plant is realized. Specifically, the high-megahertz electromagnetic wave treatment excess sludge recovery system comprises a constant temperature water bath heating reactor 401, a storage system, an excess sludge pretreatment system and a drying system.
The top of the constant-temperature water bath heating reactor 401 is provided with a feed inlet, the bottom of the constant-temperature water bath heating reactor 401 is provided with a discharge outlet, and the constant-temperature water bath heating reactor 401 is further provided with a pH meter 403, a thermometer 404 and a stirrer 402.
The storage system comprises NaOH material bins 102 and C which are respectively connected with the feed inlet through pipelines 3 H 5 NO Material storehouse 103, C 3 H 4 O 2 Solution storage tank 104, (NH) 4 ) 2 S 2 O 8 Solution storage tanks 105 and C 7 H 10 N 2 O 2 A solution storage tank 106; the pipeline connected with the NaOH material bin 102 is provided with a first powder batch feeder 203 and a first powder batch feeder C 3 H 5 The pipeline connected with the NO material bin 103 is provided with a second powder batch feeder 204 connected with the C 3 H 4 O 2 The pipe connected to the solution storage tank 104 is provided with a first metering pump 205, and (NH) 4 ) 2 S 2 O 8 The pipe connecting the solution storage tank 105 is provided with a second metering pump 206, which is connected with C 7 H 10 N 2 O 2 The tubing connected to the solution storage tank 106 is provided with a peristaltic pump 207.
The excess sludge pretreatment system comprises an excess sludge material bin 101 and a high megahertz electromagnetic wave treatment chamber 301 which generates electromagnetic waves with certain frequency inside, wherein an excess sludge conveying belt 202 which can convey excess sludge to a feeding hole is arranged in the high megahertz electromagnetic wave treatment chamber 301, and the excess sludge material bin 101 is connected to the excess sludge conveying belt 202 through a powder feeding machine 201.
The drying system comprises a drying box 302 connected with a discharge port through a pipeline; the piping connected to the drying box 302 is provided with a third metering pump 208.
Example 2
The embodiment provides a method for recovering surplus sludge processed by high megahertz electromagnetic wave, which adopts the system for recovering surplus sludge processed by high megahertz electromagnetic wave in the embodiment 1, and specifically comprises the following steps:
(1) Setting the temperature of a constant-temperature water bath heating reactor to be controlled at 40-45 ℃, feeding 0.307kg of NaOH in a NaOH material bin into the constant-temperature water bath heating reactor through a first powder feeder, and feeding C through a first metering pump 3 H 4 O 2 1kg of C in solution storage tank 3 H 4 O 2 Solution (C) 3 H 4 O 2 85 percent by mass) is added into a constant-temperature water bath heating reactor to form C with the neutralization degree of about 65 percent 3 H 4 O 2 And C 3 H 4 O 2 A salt solution.
(2) Feeding C through a second material feeder 3 H 5 0.085kg of C in NO material bin 3 H 5 Adding NO into the reactor heated by the constant temperature water bath for mixing and stirring.
(3) (NH) is fed by a second metering pump 4 ) 2 S 2 O 8 1L of (NH) in solution storage tank 4 ) 2 S 2 O 8 The solution (concentration: 0.0085 kg/L) was added to a constant temperature water bath heated reactor and stirred for 0.5h.
(4) After the reaction is finished, C is pumped by a peristaltic pump 7 H 10 N 2 O 2 1L of C in solution storage tank 7 H 10 N 2 O 2 The solution (concentration: 0.0085 kg/L) was stirred in a constant temperature water bath heating reactor.
(5) Conveying 0.34kg of excess sludge in an excess sludge material bin to an excess sludge conveying belt in a high-megahertz electromagnetic wave treatment chamber through a powder feeder, and staying for high-megahertz electromagnetic wave treatment for 4min, wherein the frequency of the high-megahertz electromagnetic wave is 915 megahertz; then, the mixture is conveyed and fed into a constant temperature water bath heating reactor along with the movement of a residual sludge conveyer belt, the reaction is carried out for 2 hours, and the pH value of the mixed liquid obtained after the reaction is adjusted to 5.5.
(6) And finally, conveying the mixed solution in the constant-temperature water bath heating reactor to a drying box through a third metering pump, wherein the drying temperature of the drying box is 80-95 ℃, and drying and forming for 12 hours to obtain the soil conditioner which has the characteristics of high water absorbability and high water supply performance.
To verify the beneficial effects of the present invention, the soil conditioner prepared in example 2 was subjected to the following tests.
Experiment (1): mixing the soil conditioner into the soil matrix according to the proportion of 0, 1: 250. 1: 500. 1: no plant experiments were performed at 1000 and are represented by A1, A2, A3, A4, respectively.
Experiment (2): mixing the soil conditioner into the soil matrix according to the proportion of 0, 1: 250. 1: 500. 1:1000 plant experiments are synchronously carried out by taking single Chinese rose as a vegetation representative, and are respectively represented by B1, B2, B3 and B4.
Specifically, nutrient soil and 5kg of equivalent soil are added into a flowerpot, and soil conditioners are respectively added according to the proportion of the experiments (1) and (2) and are fully mixed. Filling soil to the edge of the basin, and watering thoroughly. The indexes are measured from 0d after the experiment is started, and the indexes comprise the water content (%) of a soil sample, the plant height (cm), the pH of the soil sample, and the contents of metals such as cadmium (mg/kg), mercury (mg/kg), arsenic (mg/kg), copper (mg/kg), lead (mg/kg), chromium (mg/kg), zinc (mg/kg), nickel (mg/kg) and the like. The soil sampling dates are 1d, 4d, 7d, 10d and 13d, and the measurement is repeated for 3 times every 3 d. The test pieces were placed in the garden at a temperature of 20 ℃ to 25 ℃ and an air humidity of about 60%, and 3 pots were used for each test group. The change of the soil moisture content is shown in figures 2 and 3; the plant height variation of the Chinese rose plants is shown in FIG. 4; the soil pollution detection results are shown in the following table 1, wherein the standard requirements are standard values of GB 15618-1995 soil pollution risk control standard.
TABLE 1 soil pollution test results
As can be seen from table 1 and fig. 2 to 4: (1) The soil conditioner prepared by the invention can reduce the rate of soil moisture reduction and can also promote plant growth. (2) The soil pollution content of the soil conditioner prepared by the invention meets the requirements of GB 15618-1995 soil pollution risk control standard, and can be applied to actual production.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A method for recovering excess sludge through high megahertz electromagnetic wave treatment is characterized by comprising the following steps:
(1) Adding NaOH with the mass of X and C with the mass of Y into a constant-temperature water bath heating reactor 3 H 4 O 2 Solution of a certain degree of neutralization C 3 H 4 O 2 And C 3 H 4 O 2 A reaction solution composed of a salt solution;
(2) C with the mass of Z is added into a constant-temperature water bath heating reactor 3 H 5 NO is mixed and stirred;
(3) Will be of mass W (NH) 4 ) 2 S 2 O 8 Adding the solution into a constant-temperature water bath heating reactor, and stirring for reacting for a period of time;
(4) After the reaction is finished, adding C with the mass of V 7 H 10 N 2 O 2 Adding the solution into a constant-temperature water bath heating reactor for stirring;
(5) Adding the residual sludge with the mass A into a high megahertz electromagnetic wave treatment chamber to carry out high megahertz electromagnetic wave treatment for a period of time, then adding the sludge into a constant-temperature water bath to heat a reactor, reacting for a period of time and adjusting the pH of a mixed solution obtained after the reaction;
(6) And finally, conveying the mixed solution to a drying oven for drying and forming to obtain the soil conditioner.
2. The method for recovering excess sludge through high megahertz electromagnetic wave treatment as claimed in claim 1, wherein: the temperature of the constant-temperature water bath heating reactor is controlled to be 40-45 ℃.
3. The method of claim 1, wherein the method comprises the steps of: the mass of each raw material satisfies the following relational expression: x is more than or equal to 0.278Y and less than or equal to 0.445Y, Z is more than or equal to 0.01Y and less than or equal to 0.1Y, W is more than or equal to 0.002Y and less than or equal to 0.025Y, V is more than or equal to 0.001Y and less than or equal to 0.04Y, and A is more than or equal to 0.3Y and less than or equal to 0.7Y.
4. The method of claim 1, wherein the method comprises the steps of: in step (1), the resultant polymer is composed of C 3 H 4 O 2 And C 3 H 4 O 2 The neutralization degree of the reaction solution formed by the salt solution is 50-80%.
5. The method for recovering excess sludge through high megahertz electromagnetic wave treatment as claimed in claim 1, wherein: in step (3), the reaction time was stirred for 0.5h.
6. The method of claim 1, wherein the method comprises the steps of: in the step (5), the frequency of the high megahertz electromagnetic wave is 915 megahertz, and the processing time of the high megahertz electromagnetic wave is 4min.
7. The method of claim 1, wherein the method comprises the steps of: in the step (5), the excess sludge treated by the high-megahertz electromagnetic wave radiation is added into a constant-temperature water bath heating reactor for reaction for 2 to 3 hours.
8. The method for recovering excess sludge through high megahertz electromagnetic wave treatment as claimed in claim 1, wherein: in the step (5), the pH of the mixed solution is adjusted by NaOH and C 3 H 4 O 2 The adding of the solution is controlled, and the pH range is 4.5-5.5.
9. The method of claim 1, wherein the method comprises the steps of: in the step (6), the drying temperature of the drying oven is 80-95 ℃, and the drying time of the mixed solution in the drying oven is 12-24 h.
10. A high mhz emfs sludge recycling system for implementing the high mhz emfs sludge recycling method of claim 1 and preparing a soil amendment, comprising:
a constant temperature water bath heating reactor, wherein the top of the constant temperature water bath heating reactor is provided with a feeding hole, the bottom of the constant-temperature water bath heating reactor is provided with a discharge hole, and the constant-temperature water bath heating reactor is also provided with a pH meter, a thermometer and a stirrer;
a storage system including a NaOH material bin and a C connected with the feed inlet via pipelines 3 H 5 NO Material storehouse, C 3 H 4 O 2 Solution storage tank, (NH) 4 ) 2 S 2 O 8 Solution storage tank and C 7 H 10 N 2 O 2 A solution storage tank; the pipeline connected with the NaOH material bin is provided with a first powder feeding machine and a first powder feeding machine C 3 H 5 The pipeline connected with the NO material bin is provided with a second powder feeding machine and a C 3 H 4 O 2 The pipeline connected with the solution storage tank is provided with a first metering pump and (NH) 4 ) 2 S 2 O 8 The pipeline connected with the solution storage tank is provided with a second metering pump connected with the C 7 H 10 N 2 O 2 A peristaltic pump is arranged on a pipeline connected with the solution storage tank;
the system comprises a surplus sludge pretreatment system, a sludge storage bin and a high megahertz electromagnetic wave treatment chamber, wherein the high megahertz electromagnetic wave treatment chamber generates electromagnetic waves with certain frequency, a surplus sludge conveying belt capable of conveying surplus sludge to a feed inlet is arranged in the high megahertz electromagnetic wave treatment chamber, and the surplus sludge storage bin is connected to the surplus sludge conveying belt through a powder feeding machine;
the drying system comprises a drying box connected with the discharge port through a pipeline; and a third metering pump is arranged on a pipeline connected with the drying box.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076515A (en) * | 1975-07-09 | 1978-02-28 | Rickard M David | Method for treatment of digester supernatant and other streams in wastewater treatment facilities |
| CN110776925A (en) * | 2019-11-20 | 2020-02-11 | 榆林学院 | Water-retaining agent prepared from excess sludge, and preparation method and application method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076515A (en) * | 1975-07-09 | 1978-02-28 | Rickard M David | Method for treatment of digester supernatant and other streams in wastewater treatment facilities |
| CN110776925A (en) * | 2019-11-20 | 2020-02-11 | 榆林学院 | Water-retaining agent prepared from excess sludge, and preparation method and application method thereof |
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