CN110746061A - Sludge treatment method - Google Patents
Sludge treatment method Download PDFInfo
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- CN110746061A CN110746061A CN201911043254.0A CN201911043254A CN110746061A CN 110746061 A CN110746061 A CN 110746061A CN 201911043254 A CN201911043254 A CN 201911043254A CN 110746061 A CN110746061 A CN 110746061A
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- sludge
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- flocculant
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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
- C02F11/004—Sludge detoxification
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- 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
-
- 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
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
-
- 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
- C02F2303/04—Disinfection
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge treatment method, which comprises the following steps: putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring; carrying out centrifugal concentration, dehydration and filtration on the treated sludge; carrying out thermal hydrolysis and flash evaporation treatment on the obtained filtrate; adding a proper amount of nutrient elements into the treated sludge; and (4) carrying out a drying process on the treated sludge by adopting a fluidized bed to obtain sludge particles. Firstly, treating sludge by using a treating agent to realize stabilization treatment on heavy metal components in the sludge; microorganisms are destroyed in a high-temperature environment of thermal hydrolysis, flash evaporation and fluidized bed drying, and then nutrient substances are added into the microorganisms to be used as organic fertilizers and the like, so that the sludge is harmlessly treated, the cost is low, and the method is suitable for large-batch sludge treatment.
Description
Technical Field
The invention belongs to the technical field of environmental management and relates to a sludge treatment method.
Background
According to statistics, the current urban sewage treatment plant in China discharges about 30 ten thousand tons of dry sludge every year, and the discharge speed is increased by about 10%. The components of the sludge are complex, the sludge is an extremely complex heterogeneous body consisting of organic fragments, bacterial thalli, inorganic particles, colloids and the like, and the sludge contains a large amount of water and also contains refractory organic matters, heavy metals, salts, pathogenic microorganisms, parasites, eggs and the like. If the sludge is not effectively treated, the following hazards can be brought: pathogen contamination, excessive salt contamination, excessive nitrogen and phosphorus contamination, organic polymer contamination, and heavy metal contamination. These pollutions can finally affect water and soil, damage plant root systems, easily accumulate toxicity in crops, animals and human bodies, pollute the environment and the like.
The existing sludge treatment method uses a large amount of chemical agents, further causes the problem of environmental pollution, and does not recycle the treated sludge.
Disclosure of Invention
The invention aims to provide a sludge treatment method which can treat sludge harmlessly.
The technical scheme adopted by the invention is that the sludge treatment method comprises the following steps:
step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
step 2, carrying out centrifugal concentration, dehydration and filtration on the treated sludge;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3;
and 5, drying the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles.
The invention is also characterized in that:
the treating agent comprises inorganic alkaline substances, acidic metal salt and an organic flocculating agent, wherein the inorganic alkaline substances are one or more of trona, dolomite, limestone, soda ash, caustic soda, calcium oxide, magnesium hydroxide, calcium hydroxide, cement and industrial composite alkali; the acidic metal salt is one or more of ferric chloride, ferric nitrate, ferric sulfate, zinc chloride, zinc sulfate, copper chloride, copper nitrate, copper sulfate, manganese chloride, manganese sulfate, aluminum chloride and aluminum sulfate; the organic flocculant is one or more of a macromolecular polyacrylamide flocculant, a macromolecular polycarboxylic acid flocculant, a polyacrylamide modified flocculant, a natural organic macromolecular flocculant and a microbial flocculant.
The step 2 specifically comprises the following steps: and (3) centrifugally concentrating the sludge treated in the step (1), uniformly stirring the concentrated sludge slurry, and then mechanically dehydrating to ensure that the water content of the sludge passes through a filter screen and is subjected to pressure filtration.
The temperature in the thermal hydrolysis and flash evaporation treatment process is 160-180 ℃, and the pressure is 4-5 kpa.
The nutrient elements comprise one or more of mountain mud, river sand, plant ash, animal bone powder and wood dust.
In the step 5, the temperature of the fluidized bed is 200-210 ℃, and the diameter of the obtained sludge particles is 2-4 mm.
The invention has the beneficial effects that:
the sludge treatment method of the invention firstly utilizes the treatment agent to treat the sludge to realize the stabilization treatment of the heavy metal components in the sludge; microorganisms are destroyed in a high-temperature environment of thermal hydrolysis, flash evaporation and fluidized bed drying, and then nutrient substances are added into the microorganisms to be used as organic fertilizers and the like, so that the sludge is harmlessly treated, the cost is low, and the method is suitable for large-batch sludge treatment.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
A sludge treatment method comprises the following steps:
step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
the treating agent comprises inorganic alkaline substances, acidic metal salt and an organic flocculating agent, wherein the inorganic alkaline substances are one or more of trona, dolomite, limestone, soda ash, caustic soda, calcium oxide, magnesium hydroxide, calcium hydroxide, cement and industrial composite alkali; the acidic metal salt is one or more of ferric chloride, ferric nitrate, ferric sulfate, zinc chloride, zinc sulfate, copper chloride, copper nitrate, copper sulfate, manganese chloride, manganese sulfate, aluminum chloride and aluminum sulfate; the organic flocculant is one or more of a macromolecular polyacrylamide flocculant, a macromolecular polycarboxylic acid flocculant, a polyacrylamide modified flocculant, a natural organic macromolecular flocculant and a microbial flocculant.
Step 2, performing centrifugal concentration on the sludge treated in the step 1, uniformly stirring the concentrated sludge slurry, and then dehydrating by using a machine to ensure that the water content of the sludge passes through a filter screen and is filtered under pressure;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2, so that extracellular polymers and macromolecular organic matters in the sludge are hydrolyzed again, and cell walls of microorganisms in the sludge are broken again; the temperature in the thermal hydrolysis and flash evaporation treatment process is 160-180 ℃, and the pressure is 4-5 kpa;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3, wherein the nutrient elements comprise one or a composition of more of mountain mud, river sand, plant ash, animal bone meal and wood dust;
step 5, drying the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles with the diameter of 2-4 mm; the temperature of the fluidized bed is 200-210 ℃, pathogens and parasitic ova in the sludge are removed again by using high temperature, the sludge is dried completely, and the sludge particles of the final product are distributed uniformly. The obtained sludge particles can be used as organic fertilizer for agricultural planting.
Through the mode, the sludge treatment method disclosed by the invention has the advantages that the sludge is treated by the treating agent to realize the stabilization treatment of heavy metal components in the sludge; the method is environment-friendly, pollution-free, low in cost and suitable for large-batch sludge treatment.
Example 1
Step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
the treating agent is a mixture consisting of dolomite, calcium oxide, magnesium hydroxide, ferric chloride, copper nitrate, aluminum chloride, aluminum sulfate, a high-molecular polyacrylamide flocculant and a polyacrylamide modified flocculant;
step 2, performing centrifugal concentration on the sludge treated in the step 1, uniformly stirring the concentrated sludge slurry, and then dehydrating by using a machine to ensure that the water content of the sludge passes through a filter screen and is filtered under pressure;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2, so that extracellular polymers and macromolecular organic matters in the sludge are hydrolyzed again, and cell walls of microorganisms in the sludge are broken again; the temperature in the thermal hydrolysis and flash evaporation treatment process is 160 ℃, and the pressure is 5 kpa;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3, wherein the nutrient elements comprise mountain mud, river sand, plant ash and wood dust;
step 5, carrying out a drying process on the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles with the diameter of 2 mm; the temperature of the fluidized bed is 200 ℃, pathogens and parasitic ova in the sludge are removed again by using high temperature, the sludge is completely dried, and the sludge particles of the final product are distributed uniformly.
Example 2
Step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
the treating agent is a mixture consisting of natural alkali, limestone, caustic soda, magnesium oxide, cement, ferric nitrate, zinc sulfate, copper nitrate, manganese chloride, aluminum sulfate and a high-molecular polycarboxylic acid flocculating agent;
step 2, performing centrifugal concentration on the sludge treated in the step 1, uniformly stirring the concentrated sludge slurry, and then dehydrating by using a machine to ensure that the water content of the sludge passes through a filter screen and is filtered under pressure;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2, so that extracellular polymers and macromolecular organic matters in the sludge are hydrolyzed again, and cell walls of microorganisms in the sludge are broken again; the temperature in the thermal hydrolysis and flash evaporation treatment process is 170 ℃, and the pressure is 4.5 kpa;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3, wherein the nutrient elements comprise river sand, animal bone powder and wood dust;
step 5, carrying out a drying process on the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles with the diameter of 3 mm; the temperature of the fluidized bed is 205 ℃, pathogens and parasitic ova in the sludge are removed again by using high temperature, the sludge is dried completely, and the sludge particles of the final product are distributed uniformly.
Example 3
Step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
the treating agent is a mixture consisting of limestone, soda ash, calcium oxide, ferric sulfate, zinc sulfate, copper nitrate, aluminum chloride natural organic polymeric flocculant and microbial flocculant.
Step 2, performing centrifugal concentration on the sludge treated in the step 1, uniformly stirring the concentrated sludge slurry, and then dehydrating by using a machine to ensure that the water content of the sludge passes through a filter screen and is filtered under pressure;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2, so that extracellular polymers and macromolecular organic matters in the sludge are hydrolyzed again, and cell walls of microorganisms in the sludge are broken again; the temperature in the thermal hydrolysis and flash evaporation treatment process is 180 ℃, and the pressure is 4 kpa;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3, wherein the nutrient elements comprise mountain mud, river sand, plant ash, animal bone meal and wood dust;
step 5, drying the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles with the diameter of 4 mm; the temperature of the fluidized bed is 210 ℃, pathogens and parasitic ova in the sludge are removed again by using high temperature, the sludge is dried completely, and the sludge particles of the final product are distributed uniformly.
Claims (6)
1. A sludge treatment method is characterized by comprising the following steps:
step 1, putting sludge to be treated into a stirring tank, stirring, and adding an equivalent treating agent while stirring;
step 2, carrying out centrifugal concentration, dehydration and filtration on the treated sludge;
step 3, carrying out thermal hydrolysis and flash evaporation treatment on the filtrate obtained in the step 2;
step 4, adding a proper amount of nutrient elements into the sludge treated in the step 3;
and 5, drying the sludge treated in the step 4 by adopting a fluidized bed to obtain sludge particles.
2. The sludge treatment method according to claim 1, wherein the treatment agent comprises inorganic alkaline substances, acidic metal salt and organic flocculant, the inorganic alkaline substances are one or more of trona, dolomite, limestone, soda ash, caustic soda, calcium oxide, magnesium hydroxide, calcium hydroxide, cement and industrial complex alkali; the acidic metal salt is one or more of ferric chloride, ferric nitrate, ferric sulfate, zinc chloride, zinc sulfate, copper chloride, copper nitrate, copper sulfate, manganese chloride, manganese sulfate, aluminum chloride and aluminum sulfate; the organic flocculant is one or more of a macromolecular polyacrylamide flocculant, a macromolecular polycarboxylic acid flocculant, a polyacrylamide modified flocculant, a natural organic macromolecular flocculant and a microbial flocculant.
3. The sludge treatment method according to claim 1, wherein the step 2 is specifically: and (3) centrifugally concentrating the sludge treated in the step (1), uniformly stirring the concentrated sludge slurry, and then mechanically dehydrating to ensure that the water content of the sludge passes through a filter screen and is subjected to pressure filtration.
4. The sludge treatment method according to claim 1, wherein the temperature in the thermal hydrolysis and flash evaporation treatment process is 160-180 ℃ and the pressure is 4-5 kpa.
5. The method as claimed in claim 1, wherein the nutrient elements include one or more of mountain mud, river sand, plant ash, animal bone meal, and wood dust.
6. The method of claim 1, wherein the fluidized bed temperature in step 5 is 200 ℃ to 210 ℃ to obtain sludge particles with a diameter of 2mm to 4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911043254.0A CN110746061A (en) | 2019-10-30 | 2019-10-30 | Sludge treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911043254.0A CN110746061A (en) | 2019-10-30 | 2019-10-30 | Sludge treatment method |
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| CN110746061A true CN110746061A (en) | 2020-02-04 |
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| CN201911043254.0A Pending CN110746061A (en) | 2019-10-30 | 2019-10-30 | Sludge treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461284A (en) * | 2021-07-30 | 2021-10-01 | 北京石油化工学院 | Municipal sludge treatment method for nitrate-enhanced pyrohydrolysis |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131200A (en) * | 1982-01-29 | 1983-08-04 | Unitika Ltd | Treatment of sludge |
| CN102674657A (en) * | 2012-06-11 | 2012-09-19 | 安徽国祯环保节能科技股份有限公司 | Sludge dewatering method for urban sewage plant |
| CN104229957A (en) * | 2013-06-24 | 2014-12-24 | 张家领 | Compound flocculant taking natural minerals as main components |
| CN104628233A (en) * | 2014-12-30 | 2015-05-20 | 浙江海亮固废处理科技有限公司 | Deep dehydration device and deep dehydration method for organic materials |
| CN104944732A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Energy-saving recycling treatment disposal system and energy-saving recycling treatment disposal process for organic solid waste |
| CN105254149A (en) * | 2015-10-28 | 2016-01-20 | 李文锋 | Recycling technology for sludge generated after sewage treatment |
| CN109626783A (en) * | 2019-02-18 | 2019-04-16 | 苏州高新北控中科成环保产业有限公司 | A kind of sludge treatment technique of the biological dewatered coupling fluidized bed burning of superhigh temperature |
-
2019
- 2019-10-30 CN CN201911043254.0A patent/CN110746061A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131200A (en) * | 1982-01-29 | 1983-08-04 | Unitika Ltd | Treatment of sludge |
| CN102674657A (en) * | 2012-06-11 | 2012-09-19 | 安徽国祯环保节能科技股份有限公司 | Sludge dewatering method for urban sewage plant |
| CN104229957A (en) * | 2013-06-24 | 2014-12-24 | 张家领 | Compound flocculant taking natural minerals as main components |
| CN104628233A (en) * | 2014-12-30 | 2015-05-20 | 浙江海亮固废处理科技有限公司 | Deep dehydration device and deep dehydration method for organic materials |
| CN104944732A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Energy-saving recycling treatment disposal system and energy-saving recycling treatment disposal process for organic solid waste |
| CN105254149A (en) * | 2015-10-28 | 2016-01-20 | 李文锋 | Recycling technology for sludge generated after sewage treatment |
| CN109626783A (en) * | 2019-02-18 | 2019-04-16 | 苏州高新北控中科成环保产业有限公司 | A kind of sludge treatment technique of the biological dewatered coupling fluidized bed burning of superhigh temperature |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461284A (en) * | 2021-07-30 | 2021-10-01 | 北京石油化工学院 | Municipal sludge treatment method for nitrate-enhanced pyrohydrolysis |
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Application publication date: 20200204 |