CN108455812B - Method for treating organic matters in excess sludge - Google Patents
Method for treating organic matters in excess sludge Download PDFInfo
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- CN108455812B CN108455812B CN201810266090.7A CN201810266090A CN108455812B CN 108455812 B CN108455812 B CN 108455812B CN 201810266090 A CN201810266090 A CN 201810266090A CN 108455812 B CN108455812 B CN 108455812B
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: fully mixing the excess sludge with 30wt% of hydrogen peroxide and 85% of industrial formic acid in a mixer to obtain an excess sludge mixture; then the residual sludge mixture is sent into a microwave device, the mixture is heated for 4 to 6 minutes under the condition that the microwave frequency is 915MHz, the residual sludge mixture is subjected to oxidation reaction in the microwave device to obtain sludge solution, the sludge solution is sent into a heat exchanger, the sludge solution is cooled in the heat exchanger, finally the cooled sludge solution is sent into a settling tank for solid-liquid separation, the solid is settled to the bottom of the settling tank, 40 to 60 percent of the solid is refluxed into a mixer for circular reaction, 40 to 60 percent of the solid is dehydrated and then is subjected to sanitary landfill, and supernatant in the settling tank is overflowed from an upper side opening and sent into a sewage treatment plant for standard treatment.
Description
Technical Field
The invention relates to a method for treating organic matters in excess sludge generated after domestic sewage is treated by a biological method, which is suitable for a sewage treatment plant for treating sewage by the biological method and belongs to the technical field of sludge and sewage treatment.
Background
The treatment of sewage by the activated sludge process results in a large amount of excess sludge, and the treatment of this portion of sludge presents a significant challenge to sewage treatment plants. The sludge treatment cost accounts for almost 40-60% of the operation cost of sewage treatment plants. The most common treatment and disposal methods for sludge are concentration, anaerobic digestion, mechanical dehydration, drying, composting, incineration, landfill and the like. If not properly treated, these sludges can produce environmentally harmful materials, such as sludge that is rich in nitrogen and phosphorous, which if improperly treated can result in eutrophication of the water. Therefore, the treatment of the sludge has great social and economic significance.
The main component of the organic matter in the sludge is microorganisms. The biggest obstacle for preventing the release of organic matters in the sludge is extracellular polymeric substances of microorganisms, so if organic matters in the sludge are to be reused, sludge cracking needs to be carried out first, and the means for breaking the extracellular polymeric substances comprise a chemical method, a microwave heating method and an ultrasonic method. CN201110217857.5 discloses a sludge treatment method, which comprises the steps of firstly pretreating sludge by ultrasonic waves to break microbial cell walls, and mixing the treated sludge and kitchen waste according to a certain proportion for anaerobic digestion treatment. CN200410034142.6 discloses a method for treating sludge, which uses an autoclave as a reactor, carries out pyrolysis treatment in the temperature range of 110-190 ℃, carries out anaerobic digestion and dehydration in a sequencing batch anaerobic reactor, and obtains sludge cakes which can be used as fertilizer for agriculture and can also be directly used as fuel of a boiler to recover heat energy. CN201010130077.2 discloses a biological sludge reduction method, which comprises adding Tween surfactant into sludge to break cell wall of the sludge, and returning the biological sludge after cell lysis to an anaerobic or anoxic tank for anaerobic digestion. CN 201710667615.3 discloses a surplus sludge treatment process based on carbon source recycling, which comprises the steps of carrying out hot alkali treatment on surplus sludge, decomposing sludge cells, releasing nutrient substances to supernate, hydrolyzing and acidifying the sludge, and carrying out acid start and alkaline fermentation to accumulate VFAs in the solution and provide a carbon source for urban sewage with low C/N ratio. The ultrasonic method for treating the sludge can obtain the dissolved chemical oxygen demand (SCOD) equivalent to that of microwave heating, but the ultrasonic treatment of the sludge has long time and high required energy, and is not economical. The microwave can be combined with other chemical reagents to treat the sludge, such as microwave-hydrogen peroxide, microwave-peracetic acid, microwave-sulfuric acid and microwave-alkali, the dosing cost of alkali treatment is high, the operation cost is increased, the ion concentration in the sludge can be increased, the peracetic acid is a strong oxidant, is extremely unstable and has high danger in the use process, the subsequent anaerobic digestion can be adversely affected by high-concentration sulfate radicals in the sludge, the cell structure of microorganisms gathered by the activated sludge is easy to damage, enzymes in the bacteria deteriorate, and the activity is inhibited and poisoned.
The zero discharge process of the excess sludge is not that no sludge is generated in the system, but the sludge is treated or self-digested through the combination of processes so as to realize the zero discharge of the sludge. In the endogenous respiration stage of the growth of the microorganisms, most of the increased sludge is oxidized and consumed by the microorganisms, little sludge is generated, a small amount of sludge is brought out along with effluent, and the appearance that no residual sludge is discharged in a sewage treatment system is formed. However, this sludge autodigestion is only suitable for small sewage treatment plants with low concentration. CN201510912322.8 discloses a zero discharge system for wastewater, which comprises a high concentration wastewater treatment system, i.e. an evaporator, for treating wastewater with high concentration of pollutants, and a low concentration wastewater treatment system for treating wastewater with low concentration of pollutants. The high-concentration wastewater is treated by the evaporator to form low-concentration wastewater which is output to the low-concentration wastewater treatment system, only the high-concentration wastewater is evaporated in the method, and the low-concentration wastewater is filtered and ion exchanged to finally obtain pure water. The evaporator is used as evaporation equipment to evaporate high-concentration wastewater to obtain low-concentration wastewater for unified treatment, but the evaporator needs auxiliary heating energy, so that the energy consumption is high and the cost is high. CN201210251611.4 discloses a high-efficiency fecal sewage treatment method, which comprises chelation treatment, facultative treatment and primary and secondary aerobic treatment. Wherein, one part of the excess sludge generated by the primary and secondary aerobic treatments flows back to the facultative tank for organic matter retreatment, and the other part is discharged into the reflux adjusting tank for treatment. CN201210497662.5 discloses a printing and dyeing wastewater treatment process with zero sludge discharge, the invention combines water treatment, sludge reduction and incineration processes, residual sludge generated by aerobic is discharged into a CSTR pool for digestion and reduction, the final residual sludge is treated by a filter press and then is pumped into a fluidized bed furnace to complete incineration, and the process integrally realizes zero discharge of the residual sludge. However, the reduction of the sludge and the incineration process are higher in cost, and are not suitable for medium and small sewage treatment plants because the process is not as economical as the outward transportation and centralized treatment of the residual sludge.
Disclosure of Invention
The invention aims to provide a method for maximally releasing organic matters in excess sludge, wherein the released sludge solution contains higher carbohydrates, fatty acids and proteins and can be reused later, such as providing a carbon source for anaerobic digestion and methane production. The invention provides a method for treating organic matters in excess sludge, which is characterized by comprising the following steps: the sludge is oxidized by a microwave-assisted hydrogen peroxide-formic acid method, the oxidized sludge releases water to form a sludge solution, the sludge solution contains high SCOD, nitrogen and phosphorus, and after the sludge solution is precipitated, the supernatant enters anaerobic digestion equipment in a sewage treatment system to generate energy methane.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: it comprises the following steps:
(a) mixing of excess sludge and oxidizing agent
Fully mixing the excess sludge with 30wt% of hydrogen peroxide and 85% of industrial formic acid in a mixer to obtain an excess sludge mixture, wherein the 30wt% of hydrogen peroxide and the 85% of industrial formic acid respectively account for 4-8% and 2-4% of the total weight of the sludge;
(b) microwave oxidation
Sending the residual sludge mixture in the step (a) into a microwave device, heating for 4-6 minutes under the condition that the microwave frequency is 915MHz, wherein the residual sludge mixture is subjected to oxidation reaction in the microwave device to obtain sludge solution, and the outlet temperature of the sludge solution in the microwave device reaches 115-125 ℃;
(c) cooling down
Feeding the sludge solution obtained in the step (b) into a heat exchanger, cooling the sludge solution in the heat exchanger, wherein the temperature of the cooled sludge solution is 45-55 ℃;
(d) separating by precipitation
Feeding the sludge solution cooled in the step (c) into a settling tank for solid-liquid separation, and settling solids to the bottom of the settling tank, wherein 40-60% of the solids flow back to the mixer in the step (a) for circular reaction, 40-60% of the solids are dewatered and then subjected to sanitary landfill, and supernatant in the settling tank overflows from an upper side port to enter a cylindrical storage tank and then is fed into a sewage treatment plant for standard treatment;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: in step (a); the 30wt% of hydrogen peroxide and 85 wt% of industrial formic acid respectively account for 5% and 2.5% of the total weight of the sludge;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the mixer in the step (a) is respectively connected with a hydrogen peroxide storage tank and an industrial formic acid storage tank through a feeding metering pump, a stirring device is arranged in the mixer, the stirring speed of the stirring device is 60r/min, and the residual sludge, the hydrogen peroxide and the industrial formic acid are stirred in the mixer for 4-6 min;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the stirring device is an anchor stirrer, and the excess sludge, the hydrogen peroxide and the industrial formic acid are stirred in the mixer for 5 min;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the microwave device in step (b) comprises: the method comprises the following steps that (a) a snakelike glass steel tube, a furnace chamber, a furnace door, an electric circuit, a magnetron, a timer, a power distributor, an interlocking microswitch and a thermal breaker are adopted, wherein the residual sludge mixture in the step (a) is fed into the snakelike glass steel tube, the retention time of the mixture in the snakelike glass steel tube is 5min, and the outlet temperature is 120 ℃;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the oxidation reaction is to oxidize extracellular polymeric substances of microorganisms in the residual sludge by utilizing the heat radiation of microwaves and the strong oxidation of the peroxyformic acid, so that the extracellular polymeric substances are cracked and release intracellular organic nutrient substances and water to form sludge solution;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the peroxyformic acid is generated by the reaction of hydrogen peroxide and industrial formic acid in the step (a), and the thermal radiation synergistic effect of the peroxyformic acid and microwaves decomposes macromolecular organic matters in the excess sludge into micromolecular organic matters and carbon dioxide, so that SCOD (Small particle diameter oxygen dioxide) after the excess sludge is oxidized is lower than SCOD after the excess sludge is oxidized by using the hydrogen peroxide alone;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the heat exchanger is a shell-and-tube heat exchanger, sludge solution flows in a pipeline of the shell-and-tube heat exchanger, cooling water flows in a shell outside the pipeline of the shell-and-tube heat exchanger, the shell-and-tube heat exchanger is connected with a side port at the lower part of a settling tank, the sludge solution enters the settling tank and then undergoes solid-liquid separation, wherein 50% of the solids flow back to the mixer in the step (a) through a metering pump and the pipeline, and 50% of the solids are subjected to sanitary landfill after dehydration;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the settling tank consists of a conical bottom and a cylindrical upper part, and a sampling port is further arranged on the side wall of the settling tank and used for sampling and detecting SCOD and NH of the oxidized sludge solution3-N and solubility P;
the invention relates to a method for treating excess sludge in sewage treatment, which comprises the following steps: the pipes, heat exchanger, settling tank, cylindrical tank, hydrogen peroxide tank and industrial formic acid tank in steps (a), (b), (c) and (d) are made of stainless steel material, and the mixer is made of stainless steel material coated with ceramic coating.
The invention has the beneficial effects that:
1) by the method, more than 90% of carbon source and N, P in the residual sludge are dissolved out along with water in microbial cells in the sludge.
2) The sludge solution after the sludge oxidation can enter a sewage treatment plant for generating excess sludge to be treated up to the standard, and can also be used for recovering energy biogas through anaerobic reaction, and the sludge after the sewage treatment or the anaerobic generation can be treated again through the method, so that the zero emission of the sludge can be basically realized, the sludge reduction is realized, and the pollution caused by sludge incineration or landfill is reduced to a certain extent.
3) By the method, 90% of sludge can be treated, only 5% of sludge which is difficult to treat comprises impurities and partial microbial cell walls, the partial sludge is subjected to landfill after dehydration, 5% of sludge can be returned to the mixer for circular treatment, and the amount of residual sludge is greatly reduced.
Drawings
FIG. 1 is a process flow diagram of a method of treating excess sludge in sewage treatment according to the present invention;
FIG. 2 is a comparison of the physical properties of the excess sludge sampled before and after the microwave oxidation.
Detailed Description
As shown in FIG. 1, the method for treating excess sludge in sewage treatment according to the present invention comprises the steps of:
(a) mixing of excess sludge and oxidizing agent
Fully mixing the excess sludge with 30wt% of hydrogen peroxide and 85% of industrial formic acid in a mixer to obtain an excess sludge mixture, wherein the 30wt% of hydrogen peroxide and the 85% of industrial formic acid respectively account for 4-8% and 2-4% of the total weight of the sludge, and the optimal use amounts of the 30wt% of hydrogen peroxide and the 85% of industrial formic acid respectively account for 5% and 2.5% of the total weight of the sludge, the mixer is respectively connected with a hydrogen peroxide storage tank and an industrial formic acid storage tank through a feeding metering pump, the mixing process is continuous, the effective volume of the mixer is 55L, a stirring device is arranged in the mixer, the stirring device is an anchor type stirrer, the stirring speed of the stirring device is 60r/min, the excess sludge, the hydrogen peroxide and the industrial formic acid are stirred in the mixer for 4-6min, and the optimal stirring time is 5 min;
(b) microwave oxidation
Feeding the residual sludge mixture obtained in the step (a) into a microwave device, heating for 4-6 minutes under the condition that the microwave frequency is 915MHz, wherein the optimal heating time is 5 minutes, the residual sludge mixture is subjected to oxidation reaction in the microwave device to obtain a sludge solution, the outlet temperature of the sludge solution in the microwave device reaches 115-125 ℃, the optimal temperature reaches 120 ℃, and the microwave device comprises: the method comprises the following steps that a snakelike glass steel tube, a furnace chamber, a furnace door, an electric circuit, a magnetron, a timer, a power distributor, an interlocking microswitch and a thermal breaker are adopted, the residual sludge mixture obtained in the step (a) is fed into the snakelike glass steel tube, the inner diameter of the pipeline is 50mm, the length of the pipeline is 30m, the flow rate of a mixed solution is 10kg/min, the oxidation reaction generated by the residual sludge mixture is the strong oxidation synergistic effect of the heat radiation of microwaves and peroxyformic acid generated by the reaction of hydrogen peroxide and industrial formic acid in the step (a) to oxidize extracellular polymers of microorganisms in the residual sludge, so that the extracellular polymers are broken and release intracellular organic nutrients and moisture, macromolecular organic matters are decomposed into micromolecular organic matters and carbon dioxide to form a sludge solution, and the SCOD obtained by oxidizing the residual sludge is lower than the SCOD obtained by independently using hydrogen peroxide;
(c) cooling down
Sending the sludge solution in the step (b) into a heat exchanger, cooling the sludge solution in the heat exchanger, wherein the temperature of the cooled sludge solution is 45-55 ℃, the heat exchanger is a tube-in-tube heat exchanger, the sludge solution flows in a pipeline of the tube-in-tube heat exchanger, the flow rate is 10kg/min, cooling water flows in a shell outside the pipeline of the tube-in-tube heat exchanger, the initial temperature of the cooling water is 0 ℃, the flow rate is 20L/min, and the tube-in-tube heat exchanger is connected with a side port at the lower part of a precipitation tank;
(d) separating by precipitation
Feeding the sludge solution cooled in the step (c) into a settling tank for solid-liquid separation, wherein the settling tank consists of a conical bottom and a cylindrical upper part, the solid sinks to the bottom of the settling tank, the settled solid accounts for about 10% of the amount of the fed residual sludge, namely 90% of the amount of the fed residual sludge is dissolved after microwave oxidation reaction, 40-60% (optimally 50%) of the solid flows back into the mixer in the step (a) through a pump and a pipeline for circular reaction, 40-60% (optimally 50%) of the solid is subjected to sanitary landfill after dehydration, supernatant in the settling tank overflows from an upper side port into a cylindrical storage tank and then is fed into a sewage treatment plant for standard treatment, and a sampling port is further arranged on the side wall of the settling tank and used for sampling and detecting SCOD (sulfur dioxide) and NH (NH) of the oxidized sludge solution3-N and solubility P, precipitation tankAnd carrying out the downward slope cultivation on the cylindrical storage tank by the volume of 1m respectively.
The pipes, heat exchanger, settling tank, cylindrical tank, hydrogen peroxide tank and industrial formic acid tank in steps (a), (b), (c) and (d) are made of stainless steel material, and the mixer is made of stainless steel material coated with ceramic coating.
And (d) pumping the supernatant in the storage tank in the step (d) into an anaerobic reactor for digestion treatment, wherein the anaerobic reactor is a product (ZL 201210031323.8) independently developed by the company. Anaerobic sludge which accounts for one fourth to one third of the volume of the anaerobic reactor is filled in the anaerobic reactor, the mixture is fermented in the anaerobic reactor for 15 to 25 days at the high temperature of 55 +/-2 ℃, 75 to 85 percent of organic matters in the mixture are degraded and converted into methane, the methane enters a gas storage cabinet for storage after dehydration and desulfurization, the mixture in the anaerobic reactor is detected every day, when the removal rate of TS is more than 60 percent, sewage is sent into a storage tank, the retention time of the sewage in the storage tank is 2 to 4 hours, and a stirrer is arranged in the storage tank. And (2) feeding the sewage treated by the anaerobic reactor into a denitrification tank through a mesh grid with the diameter of 0.5mm for denitrification treatment, wherein the denitrification tank is filled with facultative sludge and an autotrophic denitrification device, the content of the facultative sludge in the sewage is 8-12 g/L, the dissolved oxygen in the sewage is less than 0.5mg/L, and the sewage stays in the denitrification tank for 3-8 hours to remove more than 97% of nitrite and nitrate in the sewage. The sewage after denitrification treatment is sent into an aerobic tank, the temperature of the sewage in the aerobic tank is controlled to be 20-30 ℃, aerobic sludge with the content of 8-12 g/L is filled in the aerobic tank, the pH of the sewage in the aerobic tank is 7-8.5, the oxygen content in the sewage in the aerobic tank is controlled to be 2-6 mg/L, the sewage stays in the aerobic tank for 8-15 hours, more than 98% of organic matters in the sewage are degraded, and the discharged water meets the sewage standard of municipal sewage unified treatment in DB 11/307-2005 water pollutant discharge Standard.
From the comparison of the physical properties of the excess sludge before microwave oxidation and the physical properties of the sewage after microwave oxidation in fig. 2, it can be clearly seen that: SCOD and NH of sludge solution3N and solubility P vs. SCOD, NH of excess sludge3the-N and the solubility P are obviously improved, almost all organic matters in the sludge can be dissolved by using the method, and the dissolved solution can be used as a carbon source and a nitrogen source for reutilization, so that the zero emission of the sludge is basically realized, and the pollution caused by incineration or landfill of the sludge is greatly reduced.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the spirit of the invention.
Claims (10)
1. A method for treating organic matters in excess sludge is characterized by comprising the following steps: it comprises the following steps:
(a) mixing of excess sludge and oxidizing agent
Fully mixing the excess sludge with 30wt% of hydrogen peroxide and 85% of industrial formic acid in a mixer to obtain an excess sludge mixture, wherein the 30wt% of hydrogen peroxide and the 85% of industrial formic acid respectively account for 4-8% and 2-4% of the total weight of the sludge;
(b) microwave oxidation
Sending the residual sludge mixture in the step (a) into a microwave device, heating for 4-6 minutes under the condition that the microwave frequency is 915MHz, wherein the residual sludge mixture is subjected to oxidation reaction in the microwave device to obtain sludge solution, and the outlet temperature of the sludge solution in the microwave device reaches 115-125 ℃;
(c) cooling down
Feeding the sludge solution obtained in the step (b) into a heat exchanger, cooling the sludge solution in the heat exchanger, wherein the temperature of the cooled sludge solution is 45-55 ℃;
(d) separating by precipitation
And (c) feeding the sludge solution cooled in the step (c) into a settling tank for solid-liquid separation, precipitating the solid to the bottom of the settling tank, refluxing 40-60% of the solid into the mixer in the step (a) for circular reaction, dehydrating 40-60% of the solid, performing sanitary landfill, overflowing the supernatant in the settling tank into a cylindrical storage tank through an upper side opening, and feeding the supernatant into a sewage treatment plant for standard treatment.
2. The method for treating organic matter in excess sludge according to claim 1, wherein: in step (a); the 30wt% hydrogen peroxide and 85% industrial formic acid account for 5% and 2.5% of the total weight of the sludge respectively.
3. The method for treating organic matter in excess sludge according to claim 2, wherein: the mixer in the step (a) is respectively connected with a hydrogen peroxide storage tank and an industrial formic acid storage tank through a feeding metering pump, a stirring device is arranged in the mixer, the stirring speed of the stirring device is 60r/min, and the residual sludge, the hydrogen peroxide and the industrial formic acid are stirred in the mixer for 4-6 min.
4. The method for treating organic matter in excess sludge according to claim 3, wherein: the stirring device is an anchor stirrer, and the residual sludge, the hydrogen peroxide and the industrial formic acid are stirred in the mixer for 5 min.
5. The method for treating organic matter in excess sludge according to claim 1, wherein: the microwave device in step (b) comprises: the method comprises the following steps of (a) feeding the residual sludge mixture into a snakelike glass steel tube, wherein the remaining sludge mixture is kept in the snakelike glass steel tube for 5min, and the outlet temperature is 120 ℃.
6. The method for treating organic matter in excess sludge according to claim 5, wherein: the oxidation reaction is to oxidize extracellular polymeric substances of microorganisms in the residual sludge by utilizing the heat radiation of microwaves and the strong oxidation of the peroxyformic acid, so that the extracellular polymeric substances are cracked and release intracellular organic nutrient substances and water to form a sludge solution.
7. The method for treating organic matter in excess sludge according to claim 6, wherein: the peroxyformic acid is generated by the reaction of hydrogen peroxide and industrial formic acid in the step (a), and the thermal radiation synergistic effect of the peroxyformic acid and microwaves decomposes macromolecular organic matters in the excess sludge into micromolecular organic matters and carbon dioxide, so that SCOD (Small particle diameter oxygen dioxide) after the excess sludge is oxidized is lower than SCOD after the excess sludge is oxidized by using the hydrogen peroxide alone.
8. The method for treating organic matter in excess sludge according to claim 1, wherein: the heat exchanger is a shell-and-tube heat exchanger, the sludge solution flows in the pipeline of the shell-and-tube heat exchanger, the cooling water flows in the shell outside the pipeline of the shell-and-tube heat exchanger, the shell-and-tube heat exchanger is connected with a side port at the lower part of the settling tank, the sludge solution enters the settling tank and then undergoes solid-liquid separation, wherein 50% of the solids flow back to the mixer in the step (a) through the metering pump and the pipeline, and 50% of the solids undergo sanitary landfill after dehydration.
9. The method for treating organic matter in excess sludge according to claim 8, wherein: the settling tank consists of a conical bottom and a cylindrical upper part, and a sampling port is further arranged on the side wall of the settling tank and used for sampling and detecting SCOD and NH of the oxidized sludge solution3-N and solubility P.
10. The method for treating organic matter in excess sludge according to any one of claims 1 to 9, wherein: the pipes, heat exchanger, settling tank, cylindrical tank, hydrogen peroxide tank and industrial formic acid tank in steps (a), (b), (c) and (d) are made of stainless steel material, and the mixer is made of stainless steel material coated with ceramic coating.
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| CN1405103A (en) * | 2001-09-20 | 2003-03-26 | 中国石化集团齐鲁石油化工公司 | Sludge treatment method |
| CN102190417A (en) * | 2010-03-10 | 2011-09-21 | 中国科学院生态环境研究中心 | Microwave-hydrogen peroxide synergism-based method and device for treating residual sludge |
| CN103319066A (en) * | 2012-03-23 | 2013-09-25 | 宇星科技发展(深圳)有限公司 | Sludge deep dehydration method |
| CN105948436A (en) * | 2016-06-29 | 2016-09-21 | 崔恩喜 | System and method for stabilizing and recycling excess sludge of sewage treatment plant |
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| CN1405103A (en) * | 2001-09-20 | 2003-03-26 | 中国石化集团齐鲁石油化工公司 | Sludge treatment method |
| CN102190417A (en) * | 2010-03-10 | 2011-09-21 | 中国科学院生态环境研究中心 | Microwave-hydrogen peroxide synergism-based method and device for treating residual sludge |
| CN103319066A (en) * | 2012-03-23 | 2013-09-25 | 宇星科技发展(深圳)有限公司 | Sludge deep dehydration method |
| CN105948436A (en) * | 2016-06-29 | 2016-09-21 | 崔恩喜 | System and method for stabilizing and recycling excess sludge of sewage treatment plant |
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