CN110563298A - Municipal sludge dewatering treatment method - Google Patents
Municipal sludge dewatering treatment method Download PDFInfo
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- CN110563298A CN110563298A CN201910686143.5A CN201910686143A CN110563298A CN 110563298 A CN110563298 A CN 110563298A CN 201910686143 A CN201910686143 A CN 201910686143A CN 110563298 A CN110563298 A CN 110563298A
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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Abstract
The invention relates to a municipal sludge dewatering treatment method, and belongs to the technical field of environmental protection. The invention takes the mixed straws as the basic raw material, carries out alkali treatment by using sodium hydroxide solution, and reduces the sugar substances on the surfaces of the straws by using the auxiliary agent, the acrylic acid and the mixed monomer react with each other and are mixed with the nutrient solution to fully absorb the nutrient substances in the nutrient solution, therefore, when in use, the modified straw particles are fully combined with municipal sludge, microorganisms in the sludge are attracted by utilizing nutrient substances in the modified straw particles, and metal ions in the sludge are combined by the polymer, the invention solves the problems that municipal sludge is dehydrated by manual or mechanical airing and turning over in the traditional mode at present, the efficiency is low, and the water content of the dehydrated sludge is high.
Description
Technical Field
the invention relates to a municipal sludge dewatering treatment method, and belongs to the technical field of environmental protection.
Background
With the rapid development of economic society and the acceleration of urbanization process, urban population is increasing, domestic sewage is increasing, urban drainage infrastructure is more and more perfect, and the network access rate of sewage is increasing. The contradiction between the continuous increase of the sludge amount generated in the municipal sewage treatment process and the insufficient treatment capacity is increasingly prominent, and the municipal sludge treatment and management work faces serious challenges. Particularly, the planning and design of various municipal sewage treatment plants have the phenomenon of 'heavy water and light sludge', and the investment of the sludge treatment process part matched with the sewage treatment process is seriously insufficient. Although the sludge production amount only accounts for 0.3 to 0.5 percent (volume fraction) of the sewage treatment amount; in the whole capital cost of most sewage treatment plants, the cost for treating the sludge is less than 5 percent, because the sludge is generally only subjected to a simple flow of 'concentration → mechanical dehydration → discharge' during the process design of the sewage treatment plants, and the harmless treatment of the sludge is not considered. When the concentrated sludge is mechanically dewatered by a sewage treatment plant, flocculating agents such as Polyacrylamide (PAM) and the like are often added, the water content of the discharged sludge is as high as about 80 percent, and the discharged sludge is difficult to directly utilize. Because the sludge contains a large amount of toxic and harmful substances, such as parasitic ova, pathogenic microorganisms, bacteria, synthetic organic matters and heavy metal ions, the sludge is not suitable to be used as organic fertilizer of grains, fruits and vegetables, and secondary pollution to the environment can be caused if the sludge is not treated properly, so that the municipal sludge and domestic garbage are listed as dangerous wastes by the environmental protection department, and a municipal sludge treatment method capable of solving large, medium and small cities is needed.
at present, the common methods for treating the municipal sludge comprise a landfill method, a composting method, an anaerobic nitrification method, a pyrolysis method and the like. Although the landfill method is the most used method at present in China, the landfill method is not used in some developed countries in Europe because the environmental pollution is not finally eliminated and is only delayed for a while. The landfill needs to solve the seepage prevention of sludge leachate and the safe disposal of methane gas generated by sludge fermentation, and has very high environmental requirements and technical requirements; recent research shows that the project of sludge disposal by adopting a sanitary landfill mode can not meet the standard requirements, the landfill is carried out according to the standard, the cost is very high, and a large amount of land resources are occupied. The composting takes time, occupies a large area, gives off odor and is easy to cause secondary pollution. The pyrolysis method is still in a experimental research stage at present because the pyrolysis method is complex in reaction condition, limited by the property of the sludge, poor in adaptability of the device and extremely difficult to control the process.
The anaerobic nitrification method can convert organic matters in the sludge into bioenergy and can also meet the increasingly strict environmental requirements. In the first stage of nitration, the high molecular organic matter is decomposed into low molecular intermediate product by the action of facultative anaerobe, the decomposed product and metabolic product produced by flora are mineralized by the action of obligate anaerobe in the second stage, and are decomposed into water-soluble inorganic matter and gas, and through nitration, the volume of sludge can be reduced, methane gas can be produced, foul smell can be eliminated, the dewatering performance of sludge can be improved, and almost all pathogenic bacteria and roundworm ova can be killed, and the toxic and harmful organic residue can be oxidized and decomposed. And enterprises can use the dried sludge for making bricks, thereby bringing better economic benefit to the enterprises. And part of brick and tile production enterprises construct an open type simple workshop to air-dry the sludge naturally, and the sludge is matched with a mode of manual or mechanical airing and turning over the sludge to promote the water content of the sludge to be reduced, so that the sludge and shale and other raw materials are uniformly mixed and then crushed to enter the next brick making process. The method has low drying efficiency, the water content of the dried sludge is more than 40 percent, odor, dust and the like are easily generated in the airing and stack turning processes, the surrounding environment is polluted, the occupied area is large, and the method is difficult to popularize.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: to artifical or mechanical sunning of present traditional mode, turn over the heap and dewater municipal sludge, inefficiency, and the high problem of sludge water content after the dehydration, this application provides a municipal sludge dewatering's method.
in order to solve the technical problems, the invention adopts the following technical scheme:
A treatment method for municipal sludge dehydration comprises the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10: 3-5: 4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring at the temperature of 40-45 ℃;
(2) After the stirring at the heat preservation is finished, naturally ventilating, standing, filtering, collecting filtrate, mixing the filtrate, ferric chloride, additive particles and water according to the mass ratio of 9-10: 2:1:3, standing at 30-35 ℃, and collecting a mixture;
(3) placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the mixture and the potassium permanganate solution at the same volume, standing overnight, supplying power on one side of the anode at the voltage of 30-40V for 2-4 h, removing the power supply, and collecting the mixture in a cement pool;
(4) And filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 1-3 days to finish municipal sludge dewatering.
the preparation method of the modified straw particles in the step (1) comprises the following steps:
A. Crushing rice straws and wheat straws in a mass ratio of 3: 3-7, collecting crushed materials, mixing the crushed materials, a sodium hydroxide solution and an auxiliary agent in a mass ratio of 7:13: 0.3-0.5, stirring and heating, filtering, washing, drying, and collecting dried materials;
B. Taking 120-160 parts of water, 50-60 parts of a dry matter, 10-13 parts of acrylic acid, 8-12 parts of a mixed monomer, 3-5 parts of an additive, 1-2 parts of an initiator and 1-3 parts of a surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, using nitrogen for protection, preheating, adding the initiator and the surfactant, heating, stirring for reaction, discharging, spray-drying, and collecting a spray-dried matter;
C. And mixing the spray-dried product with the nutrient solution according to the mass ratio of 1: 3-5, standing, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
And B, mixing the auxiliary agent in the step A with sodium borohydride and ethanol according to the mass ratio of 1: 4-6 to obtain the composition.
the mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide according to a mass ratio of 3: 2-4.
the additive is formed by mixing sodium carbonate, ammonium nitrate and urea according to the mass ratio of 4-6: 5: 3.
the initiator is any one of potassium persulfate and sodium persulfate.
the surfactant is any one of polyoxyethylene lauryl ether and polyoxyethylene stearate.
And C, mixing 200-300 parts of water, 30-35 parts of beef powder, 10-15 parts of yeast extract, 3-6 parts of amino acid and 1-3 parts of calcium chloride, stirring, mixing, sterilizing and disinfecting to obtain the nutrient solution.
The particles added in the step 2 are formed by mixing carbon nano tubes and titanium dioxide according to the mass ratio of 4: 3-6.
the electrolytic cell is constructed, the cement is separated by a proton exchange membrane, one side is a cathode, the other side is an anode, the two stages are connected by a titanium wire and are connected with a load resistor, and the external resistor is 1960 omega; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7: 16-23: 2: 1.
compared with other methods, the method has the beneficial technical effects that:
(1) The invention takes the mixed straws as the basic raw material, carries out alkali treatment by using sodium hydroxide solution, and reduces the sugar substances on the surfaces of the straws by using the auxiliary agent, the straw particles are reacted with acrylic acid and mixed monomers to form the water-absorbent resin through the reaction, and simultaneously the generated polymer can be well combined with metal ions in sludge, and the modified straw particles are mixed with the nutrient solution to fully absorb the nutrient substances in the nutrient solution, so that the modified straw particles are fully combined with the municipal sludge when in use, by utilizing the nutrient substances in the modified straw particles to attract microorganisms in the sludge and combining metal ions in the sludge through polymers, thereby promoting the rapid propagation of microorganisms in the sludge, improving the utilization effect of water in the sludge and effectively reducing the content of the combined water in the sludge;
(2) The application mixes the additive particles and the ferric chloride, the conductivity of the additive particles is increased through the deposition of metal ions, and the modified straw has good conductivity, so that a complete circuit cycle is formed after the modified straw is placed into an anode, electrons and protons are released through the decomposition of organic matters in the sludge under the action of microorganisms, the electrons depend on a conductive medium in proper electronic sludge, the effective transmission is performed between biological components and the anode, the current is transmitted to a cathode through an external circuit to form current, the water can be effectively combined in the sludge through the transmission of the electrons, meanwhile, the water combined in the sludge is further destroyed by the existence of external voltage, the content of the combined water in the sludge is improved, and finally, the water in the sludge can be well separated through the traditional drying.
Detailed Description
And the auxiliary agent is sodium borohydride and ethanol which are mixed according to the mass ratio of 1: 4-6, and the auxiliary agent is obtained.
the mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide according to a mass ratio of 3: 2-4.
The additive is formed by mixing sodium carbonate, ammonium nitrate and urea according to the mass ratio of 4-6: 5: 3.
the initiator is any one of potassium persulfate and sodium persulfate.
The surfactant is one of polyoxyethylene lauryl ether and polyoxyethylene stearate.
The preparation method of the nutrient solution comprises the following steps of taking 200-300 parts of water, 30-35 parts of beef powder, 10-15 parts of yeast extract, 3-6 parts of amino acid and 1-3 parts of calcium chloride by weight, stirring, mixing, sterilizing and disinfecting to obtain the nutrient solution.
The preparation method of the modified straw particles comprises the following steps:
A. Crushing rice straws and wheat straws in a mass ratio of 3: 3-7, collecting crushed materials, mixing the crushed materials, 1.0mol/L sodium hydroxide solution and auxiliary agent in a mass ratio of 7:13: 0.3-0.5, stirring and heating to 80 ℃, heating for 2 hours, filtering, washing with water, drying, and collecting dried materials;
B. Taking 120-160 parts of water, 50-60 parts of a dry matter, 10-13 parts of acrylic acid, 8-12 parts of a mixed monomer, 3-5 parts of an additive, 1-2 parts of an initiator and 1-3 parts of a surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, using nitrogen for protection, preheating for 50min at 45 ℃, adding the initiator and the surfactant, heating to 80 ℃, stirring for reaction for 9h, discharging, performing spray drying, and collecting the spray-dried matter;
C. Mixing the spray-dried product with a nutrient solution according to a mass ratio of 1: 3-5, standing for 3h, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
the additive particles are formed by mixing carbon nano tubes and titanium dioxide according to the mass ratio of 4: 3-6.
Constructing an electrolytic cell, wherein the cement is separated by a proton exchange membrane, one side of the electrolytic cell is a cathode, the other side of the electrolytic cell is an anode, the two stages are connected by a titanium wire and are connected with a load resistor, and the external resistor is 1960 omega; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7: 16-23: 2: 1.
A treatment method for municipal sludge dehydration comprises the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10: 3-5: 4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring the mixture for 6-8 hours at the temperature of 40-45 ℃;
(2) after the stirring at the heat preservation is finished, naturally ventilating, stirring for 15min at the speed of 400r/min, standing for 2h, filtering, collecting filtrate, mixing the filtrate, ferric chloride, adding particles and water according to the mass ratio of 9-10: 2:1:3, standing for 2h at the temperature of 30-35 ℃, and collecting a mixture;
(3) Placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the mixture and the potassium permanganate solution at the same volume, standing overnight, supplying power on one side of the anode at the voltage of 30-40V for 2-4 h, removing the power supply, and collecting the mixture in a cement pool;
(4) And filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 1-3 days to finish municipal sludge dewatering.
Example 1
and the auxiliary agent is sodium borohydride and ethanol which are mixed according to the mass ratio of 1:6, so that the composition is obtained.
The mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide according to the mass ratio of 3: 4.
The additive is formed by mixing sodium carbonate, ammonium nitrate and urea according to the mass ratio of 6:5: 3.
The initiator is potassium persulfate.
The surfactant is polyoxyethylene lauryl ether.
the nutrient solution is prepared by taking 300 parts of water, 35 parts of beef powder, 15 parts of yeast extract, 6 parts of amino acid and 3 parts of calcium chloride by weight, stirring, mixing, sterilizing and disinfecting to obtain the nutrient solution.
The preparation method of the modified straw particles comprises the following steps:
A. crushing rice straws and wheat straws according to the mass ratio of 3:7, collecting crushed materials, mixing the crushed materials, 1.0mol/L sodium hydroxide solution and auxiliary agent according to the mass ratio of 7:13:0.5, stirring and heating to 80 ℃, heating for 2 hours, filtering, washing with water, drying, and collecting dried materials;
B. taking 160 parts of water, 60 parts of dry matter, 13 parts of acrylic acid, 12 parts of mixed monomer, 5 parts of additive, 2 parts of initiator and 3 parts of surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, preheating for 50min at 45 ℃ under the protection of nitrogen, then adding the initiator and the surfactant, heating to 80 ℃, stirring for reaction for 9h, discharging, spray-drying, and collecting spray-dried matter;
C. Mixing the spray-dried product with the nutrient solution according to the mass ratio of 1:5, standing for 3h, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
The additive particles are formed by mixing carbon nano tubes and titanium dioxide according to the mass ratio of 4: 6.
constructing an electrolytic cell, wherein the cement is separated by a proton exchange membrane, one side of the electrolytic cell is a cathode, the other side of the electrolytic cell is an anode, the two stages are connected by a titanium wire and are connected with a load resistor, and the external resistor is 1960 omega; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7:23:2: 1.
A treatment method for municipal sludge dehydration comprises the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10:5:4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring for 8 hours at 45 ℃ while keeping the temperature;
(2) after the stirring at the temperature is finished, naturally ventilating, stirring for 15min at 400r/min, standing for 2h, filtering, collecting filtrate, mixing the filtrate, ferric chloride, additive particles and water according to the mass ratio of 10:2:1:3, standing for 2h at 35 ℃, and collecting a mixture;
(3) Placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the volume of the mixture equal to that of the potassium permanganate solution, standing overnight, supplying power to one side of the anode at a voltage of 40V for 4 hours, removing the power supply, and collecting the mixture in a cement pool;
(4) And filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 3 days to finish municipal sludge dewatering.
example 2
And the auxiliary agent is sodium borohydride and ethanol which are mixed according to the mass ratio of 1:5, so that the composition is obtained.
The mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide according to the mass ratio of 3: 3.
The additive is formed by mixing sodium carbonate, ammonium nitrate and urea according to the mass ratio of 5:5: 3.
The initiator is potassium persulfate.
The surfactant is polyoxyethylene stearate.
The nutrient solution is prepared by taking 250 parts of water, 33 parts of beef powder, 13 parts of yeast extract, 5 parts of amino acid and 2 parts of calcium chloride by weight, stirring, mixing, sterilizing and disinfecting to obtain the nutrient solution.
The preparation method of the modified straw particles comprises the following steps:
A. Crushing rice straws and wheat straws according to the mass ratio of 3:5, collecting crushed materials, mixing the crushed materials, 1.0mol/L sodium hydroxide solution and auxiliary agent according to the mass ratio of 7:13:0.4, stirring and heating to 80 ℃, heating for 2 hours, filtering, washing with water, drying, and collecting dried materials;
B. taking 140 parts of water, 55 parts of dry matter, 12 parts of acrylic acid, 10 parts of mixed monomer, 4 parts of additive, 1.5 parts of initiator and 2 parts of surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, preheating for 50min at 45 ℃ under the protection of nitrogen, adding the initiator and the surfactant, heating to 80 ℃, stirring for reaction for 9h, discharging, spray-drying, and collecting spray-dried matter;
C. Mixing the spray-dried product with the nutrient solution according to the mass ratio of 1:4, standing for 3h, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
The additive particles are formed by mixing carbon nano tubes and titanium dioxide according to the mass ratio of 4: 5.
constructing an electrolytic cell, wherein the cement is separated by a proton exchange membrane, one side of the electrolytic cell is a cathode, the other side of the electrolytic cell is an anode, the two stages are connected by a titanium wire and are connected with a load resistor, and the external resistor is 1960 omega; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7:20:2: 1.
A treatment method for municipal sludge dehydration comprises the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10:4:4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring for 7 hours at 43 ℃;
(2) After the stirring at the temperature is finished, naturally ventilating, stirring for 15min at 400r/min, standing for 2h, filtering, collecting filtrate, mixing the filtrate, ferric chloride, additive particles and water according to the mass ratio of 9.5:2:1:3, standing for 2h at 33 ℃, and collecting a mixture;
(3) Placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the volume of the mixture equal to that of the potassium permanganate solution, standing overnight, supplying power on one side of the anode at 35V for 3 hours, removing the power supply, and collecting the mixture in a cement pool;
(4) and filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 2 days to finish municipal sludge dewatering.
Example 3
And the auxiliary agent is sodium borohydride and ethanol which are mixed according to the mass ratio of 1:4, so that the composition is obtained.
The mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide according to the mass ratio of 3: 2.
the additive is formed by mixing sodium carbonate, ammonium nitrate and urea according to the mass ratio of 4:5: 3.
The initiator is potassium persulfate.
The surfactant is polyoxyethylene lauryl ether.
the nutrient solution is prepared by taking 200 parts of water, 30 parts of beef powder, 10 parts of yeast extract, 3 parts of amino acid and 1 part of calcium chloride by weight, stirring, mixing, sterilizing and disinfecting to obtain the nutrient solution.
The preparation method of the modified straw particles comprises the following steps:
A. crushing rice straws and wheat straws according to the mass ratio of 3:3, collecting crushed materials, mixing the crushed materials, 1.0mol/L sodium hydroxide solution and auxiliary agent according to the mass ratio of 7:13:0.3, stirring and heating to 80 ℃, heating for 2 hours, filtering, washing with water, drying, and collecting dried materials;
B. Taking 120 parts of water, 50 parts of dry matter, 10 parts of acrylic acid, 8 parts of mixed monomer, 3 parts of additive, 1 part of initiator and 1 part of surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, preheating for 50min at 45 ℃ under the protection of nitrogen, then adding the initiator and the surfactant, heating to 80 ℃, stirring for reaction for 9h, discharging, spray-drying, and collecting spray-dried matter;
C. Mixing the spray-dried product with the nutrient solution according to the mass ratio of 1:3, standing for 3h, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
the additive particles are formed by mixing carbon nano tubes and titanium dioxide according to the mass ratio of 4: 3.
Constructing an electrolytic cell, wherein the cement is separated by a proton exchange membrane, one side of the electrolytic cell is a cathode, the other side of the electrolytic cell is an anode, the two stages are connected by a titanium wire and are connected with a load resistor, and the external resistor is 1960 omega; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7:16:2: 1.
A treatment method for municipal sludge dehydration comprises the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10:3:4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring for 6 hours at 40 ℃;
(2) after the stirring at the temperature is finished, naturally ventilating, stirring for 15min at 400r/min, standing for 2h, filtering, collecting filtrate, mixing the filtrate, ferric chloride, additive particles and water according to the mass ratio of 9:2:1:3, standing for 2h at 30 ℃, and collecting a mixture;
(3) placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the volume of the mixture equal to that of the potassium permanganate solution, standing overnight, supplying power on one side of the anode at the voltage of 30V for 2 hours, removing the power supply, and collecting the mixture in a cement pool;
(4) And filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 1 day to finish municipal sludge dewatering.
comparative example 1
Essentially the same as in example 2, except that modified straw particles were absent in step (1).
comparative example 2
the municipal sludge is dewatered by traditional manual or mechanical airing and turning.
The municipal sludge dewatering method was examined by using the above examples and comparative examples, and the results are shown in table 1, wherein sludge was collected from a concentration tank of a sewage treatment plant of Changzhou city, the moisture content of the original sludge was examined, and dewatering was carried out by using the methods of examples 1 to 3 and comparative examples 1 to 2, respectively, and the moisture content of the dewatered sludge was examined.
Table 1:
| Detecting items | Example 1 | example 2 | example 3 | comparative example 1 | Comparative example 2 |
| Water content/% before treatment | 98 | 98 | 98 | 98 | 98 |
| water content after treatment/% | 34.6 | 33.9 | 35.2 | 56.3 | 65.4 |
from the above, it can be seen from table 1 that the municipal sludge dewatering treatment method of the present invention is more effective and is worth popularizing, and the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A municipal sludge dewatering treatment method is characterized by comprising the following steps:
(1) Filtering municipal sludge, collecting filter residues, mixing the filter residues, modified straw particles and ammonium bicarbonate according to the mass ratio of 10: 3-5: 4, putting the mixture into a cement pool, discharging air in the cement pool by using carbon dioxide, and stirring at the temperature of 40-45 ℃;
(2) After the stirring at the heat preservation is finished, naturally ventilating, standing, filtering, collecting filtrate, mixing the filtrate, ferric chloride, additive particles and water according to the mass ratio of 9-10: 2:1:3, standing at 30-35 ℃, and collecting a mixture;
(3) Placing the mixture on one side of an anode in an electrolytic cell, adding the mixed solution on one side of a cathode, keeping the mixture and the potassium permanganate solution at the same volume, standing overnight, supplying power on one side of the anode at the voltage of 30-40V for 2-4 h, removing the power supply, and collecting the mixture in a cement pool;
(4) And filtering the mixture in the cement pond, collecting the filtered residues, and naturally airing and drying the filtered residues for 1-3 days to finish municipal sludge dewatering.
2. the municipal sludge dewatering treatment method according to claim 1, wherein the modified straw particles in the step (1) are prepared by the following steps:
A. crushing rice straws and wheat straws in a mass ratio of 3: 3-7, collecting crushed materials, mixing the crushed materials, a sodium hydroxide solution and an auxiliary agent in a mass ratio of 7:13: 0.3-0.5, stirring and heating, filtering, washing, drying, and collecting dried materials;
B. taking 120-160 parts of water, 50-60 parts of a dry matter, 10-13 parts of acrylic acid, 8-12 parts of a mixed monomer, 3-5 parts of an additive, 1-2 parts of an initiator and 1-3 parts of a surfactant according to parts by weight, firstly putting the water, the dry matter, the acrylic acid and the additive into a reaction kettle, using nitrogen for protection, preheating, adding the initiator and the surfactant, heating, stirring for reaction, discharging, spray-drying, and collecting a spray-dried matter;
C. And mixing the spray-dried product with the nutrient solution according to the mass ratio of 1: 3-5, standing, freeze-drying, and collecting the freeze-dried product to obtain the modified straw particles.
3. The municipal sludge dewatering treatment method according to claim 2, wherein the auxiliary agent in the step A is sodium borohydride and ethanol which are mixed according to a mass ratio of 1: 4-6.
4. the municipal sludge dewatering treatment method according to claim 2, wherein the mixed monomer is formed by mixing acrylamide and N, N-methylene bisacrylamide in a mass ratio of 3: 2-4.
5. The municipal sludge dewatering treatment method according to claim 2, wherein the additive is a mixture of sodium carbonate, ammonium nitrate and urea in a mass ratio of 4-6: 5: 3.
6. the municipal sludge dewatering treatment method according to claim 2, wherein the initiator is any one of potassium persulfate and sodium persulfate.
7. The municipal sludge dewatering treatment method according to claim 2, wherein the surfactant is any one of polyoxyethylene lauryl ether and polyoxyethylene stearate.
8. The municipal sludge dewatering treatment method according to claim 2, wherein the nutrient solution in the step C is prepared by taking 200-300 parts of water, 30-35 parts of beef powder, 10-15 parts of yeast extract, 3-6 parts of amino acid and 1-3 parts of calcium chloride by weight, stirring, mixing, and sterilizing to obtain the nutrient solution.
9. the municipal sludge dewatering treatment method according to claim 1, wherein the particles added in step 2 are carbon nanotubes and titanium dioxide mixed in a mass ratio of 4: 3-6.
10. The municipal sludge dewatering treatment method according to claim 1, wherein the electrolytic cell is constructed by separating the cement with a proton exchange membrane, one side is a cathode, one side is an anode, and the two stages are connected by using titanium wires and connected with a load resistor, and the external resistor is 1960 Ω; the mixed solution is formed by mixing manganese dioxide, water, vermiculite and zinc chloride according to the mass ratio of 7: 16-23: 2: 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111253046A (en) * | 2020-03-13 | 2020-06-09 | 成理科技(成都)股份有限公司 | Treatment method of foundation pit hydrous rock soil |
| CN112592633A (en) * | 2021-01-15 | 2021-04-02 | 赵朵 | Preparation method of heat insulation coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111253046A (en) * | 2020-03-13 | 2020-06-09 | 成理科技(成都)股份有限公司 | Treatment method of foundation pit hydrous rock soil |
| CN112592633A (en) * | 2021-01-15 | 2021-04-02 | 赵朵 | Preparation method of heat insulation coating |
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