CN111393002A - System for preparing nutrient soil through harmless biochemical sludge and preparation method of nutrient soil - Google Patents
System for preparing nutrient soil through harmless biochemical sludge and preparation method of nutrient soil Download PDFInfo
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- CN111393002A CN111393002A CN202010209254.XA CN202010209254A CN111393002A CN 111393002 A CN111393002 A CN 111393002A CN 202010209254 A CN202010209254 A CN 202010209254A CN 111393002 A CN111393002 A CN 111393002A
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- 239000010802 sludge Substances 0.000 title claims abstract description 143
- 239000002689 soil Substances 0.000 title claims abstract description 61
- 235000015097 nutrients Nutrition 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 238000003825 pressing Methods 0.000 claims abstract description 39
- 230000018044 dehydration Effects 0.000 claims abstract description 34
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 34
- 238000010335 hydrothermal treatment Methods 0.000 claims abstract description 18
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 17
- 230000007062 hydrolysis Effects 0.000 claims abstract description 14
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 42
- 208000005156 Dehydration Diseases 0.000 claims description 30
- 239000002054 inoculum Substances 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 27
- 241000894006 Bacteria Species 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000005842 biochemical reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 241000589151 Azotobacter Species 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 241000589180 Rhizobium Species 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000011368 organic material Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 230000000243 photosynthetic effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005067 remediation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003337 fertilizer Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
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- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
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- 239000002910 solid waste Substances 0.000 description 1
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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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Pest Control & Pesticides (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a system for preparing nutrient soil by harmless biochemical sludge, which comprises: the system comprises an intelligent control unit, a pretreatment unit, a hydrolysis heat treatment unit, a filter-pressing dehydration unit and a nutrient soil preparation unit; the intelligent control unit is respectively in control connection with the pretreatment unit, the hydrolysis heat treatment unit, the filter-pressing dehydration unit and the nutrient soil preparation unit; the pretreatment unit can be controlled by the intelligent control unit to carry out intelligent homogeneous pretreatment on biochemical sludge to be treated to respectively obtain organic sludge and inorganic garbage; the hydrothermal treatment unit can carry out hydrothermal treatment on the organic sludge to obtain harmless sludge; the filter-pressing dehydration unit can treat harmless sludge to obtain sludge cakes; the filter pressing dehydration unit can convey the obtained mud cakes to the nutrient soil preparation unit for preparing and obtaining the nutrient soil. The system provided by the invention realizes the treatment and comprehensive utilization of the sludge on the premise of safety, environmental protection and economy so as to achieve the purposes of energy conservation, emission reduction and circular economy development.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a system for preparing nutrient soil through harmless biochemical sludge and a preparation method of the nutrient soil.
Background
With the acceleration of the urbanization process in China and the continuous improvement of the sewage treatment rate, the yield of sludge of urban sewage treatment plants is greatly increased, and according to statistics, the amount of sludge generated in China every year exceeds 5000 million (calculated by 80 percent of water content). The proper treatment of municipal sludge has become a difficult problem in every city in China and has become a bottleneck restricting the further development of sewage treatment plants. The municipal sludge is considered as a potential and available energy resource due to the characteristics of high organic matter content, rich nutrient elements and the like. The sludge treatment aims at realizing reduction, stabilization and harmlessness of sludge, encouraging recovery and utilization of energy and resources in the sludge, and realizing treatment and comprehensive utilization of the sludge on the premise of safety, environmental protection and economy so as to achieve the aims of energy conservation, emission reduction and development of circular economy.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a nutrient soil system prepared by harmless biochemical sludge and a nutrient soil preparation method.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a system for harmless preparation of nutrient soil from biochemical sludge comprises: the system comprises an intelligent control unit, a pretreatment unit, a hydrolysis heat treatment unit, a filter-pressing dehydration unit and a nutrient soil preparation unit;
the intelligent control unit is respectively in control connection with the pretreatment unit, the hydrolysis heat treatment unit, the filter-pressing dehydration unit and the nutrient soil preparation unit;
the pretreatment unit can be controlled by the intelligent control unit to carry out intelligent homogeneous pretreatment on biochemical sludge to be treated so as to respectively obtain organic sludge and inorganic garbage;
the pretreatment unit and the hydrothermal treatment unit can convey the obtained organic sludge to the hydrothermal treatment unit;
the hydrothermal treatment unit can carry out hydrothermal treatment on the organic sludge to obtain harmless sludge;
the hydrothermal treatment unit can convey harmless sludge to the filter-pressing dehydration unit;
the filter-pressing dehydration unit can treat harmless sludge to obtain mud cakes and filter residues;
the filter-pressing dehydration unit can convey obtained mud cakes and filter residues to the nutrient soil preparation unit for preparing and obtaining nutrient soil.
Preferably, the hydrolysis heat treatment unit comprises: the device comprises a feeding bin, a feeding tank, a heating tank and a steam generator;
the feeding bin is used for storing biochemical sludge and can transmit the internally stored biochemical sludge to the feeding tank according to the requirement;
the feeding tank is used for storing biochemical sludge to be treated and can transmit the internally stored biochemical sludge to the heating tank as required;
the steam generator is used for generating steam and guiding the generated steam into the heating tank according to requirements so as to heat biochemical sludge in the heating tank;
the biochemical sludge in the heating tank can achieve the purpose of harmless treatment through hydrothermal reaction and biochemical reaction;
a feed inlet and a discharge outlet are formed in the feed bin;
the feed inlet is communicated with the pretreatment unit;
the discharge port is communicated with the feeding tank.
Preferably, a first conveying pipeline is arranged between the feeding tank and the heating tank;
a second conveying pipeline is arranged between the steam generator and the heating tank;
the feed tank conveys organic sludge through the first conveying pipe into the heating tank;
the steam generator can deliver steam into the heating tank through the second delivery pipe.
Preferably, the hydrolysis heat treatment unit further comprises: a diaphragm pump;
the diaphragm pump is located on the first conveying pipe between the feed tank and the heating tank;
the feed tank delivers organic sludge into the heating tank by means of the power of the diaphragm pump.
Preferably, the press filtration dewatering unit comprises: plate-and-frame filter presses, hydraulic pumps and air compressors;
a third conveying pipeline is arranged between the heating tank and the plate-and-frame filter press;
the hydraulic pump with the air compressor machine homoenergetic is for the plate and frame filter press provides drive power for accomplish and carry out the filter-pressing to innoxious mud and handle.
Preferably, the nutrient soil preparation unit includes: the device comprises a mud cake conveying device, a mud cake crusher, a biological bacterium blending agent storage device and a mixing and stirring device;
the mud cake conveying device is in butt joint with the plate-and-frame filter press and can convey mud cakes and filter residues prepared in the plate-and-frame filter press to the mud cake crusher;
the mud cake crusher can crush and polish mud cakes and filter residues into mud powder and can convey the mud powder into the mixing and stirring tank;
the biological bacteria blender storage tank can provide a biological bacteria blender for the mixing and stirring device to prepare nutrient soil.
Preferably, a first intelligent control valve, a second intelligent control valve and a third intelligent control valve are respectively arranged on the first conveying pipeline, the second conveying pipeline and the third conveying pipeline;
the first intelligent control valve, the second intelligent control valve and the third intelligent control valve are respectively used for controlling the opening and closing of the first conveying pipeline, the second conveying pipeline and the third conveying pipeline;
the intelligent control unit is also respectively in control connection with the first intelligent control valve, the second intelligent control valve, the third intelligent control valve, the diaphragm pump, the plate-and-frame filter press, the hydraulic pump, the air compressor, the mud cake conveying device, the mud cake crusher, the biological bacterium blending and storing device and the mixing and stirring device.
The technical scheme also provides a preparation method of nutrient soil of a nutrient soil system prepared by innocent treatment of biochemical sludge based on any one of the schemes, which is characterized by comprising the following steps:
s1, intelligent homogenizing pretreatment: putting biochemical sludge to be treated into a pretreatment unit, and performing impurity removal, crushing, homogenizing and slurrying in an integrated process to obtain organic sludge;
s2, carrying out hydrothermal decomposition treatment: putting the organic sludge in the S1 into a feeding bin, starting an intelligent control unit, and conveying the organic sludge in the feeding bin into a heating tank through a feeding tank for hydrothermal treatment to obtain harmless sludge;
s3, filter pressing dehydration treatment: conveying the harmless sludge to a filter-pressing dehydration unit for filter-pressing dehydration to obtain mud cakes and filter residues, and conveying the obtained mud cakes and filter residues to a mud cake crushing device through a mud cake conveying device;
s4, crushing treatment: the mud cake crushing device crushes and polishes the obtained mud cakes and filter residues into mud powder, and conveys the mud powder into a mixing and stirring tank;
s5, mixing and stirring treatment: the biological bacterium blending agent storage tank is controlled by the intelligent control unit to convey the biological bacterium blending agent into the mixing and stirring tank according to a proper proportion, and the mixing and stirring tank can uniformly stir the mud powder and the biological bacterium blending agent to obtain the nutrient soil.
Preferably, the temperature of the hydrothermolysis reaction in the step S2 is 180-200 ℃;
the cycle of the hydrothermolysis reaction in the step S2 is 4 hours;
the water content of the harmless sludge in the step S2 is 80%;
the step S3 further includes: cooling the sludge input into the filter-pressing dehydration unit to below 90 ℃, then starting a hydraulic pump, pressing a plate frame of a plate-frame filter press to a compact state, and then closing the hydraulic pump; and starting the diaphragm pump, keeping corresponding feeding pressure, pumping the sludge into the filter press, closing the diaphragm pump after the sludge is completely pressed in, starting the air compressor, performing secondary squeezing, starting the hydraulic pump, slowly loosening the filter frame of the filter press, and unloading sludge cakes and filter residues.
Preferably, the biological bacteria blending agent in the step S5 includes: one or more of rhizobium inoculant, azotobacter inoculant, phosphorus dissolving inoculant, silicate inoculant, mycorrhizal inoculant, photosynthetic inoculant, organic material decomposing inoculant, composite inoculant and soil remediation inoculant.
(III) advantageous effects
The invention has the beneficial effects that: the invention provides a system and a method for preparing nutrient soil by harmless biochemical sludge, which have the following beneficial effects:
the sludge is subjected to harmless treatment through hydrothermal reaction and biochemical reaction, solid phase residue is dehydrated and reduced after plate-frame filter pressing dehydration, and the reduced solid waste can achieve deodorization, plant diseases and insect pests killing and pollutant content reduction. Pathogenic microorganisms in the sludge are thoroughly killed under the high-temperature and high-pressure environment; through the dissolution and passivation of heavy metal at high temperature, the content of heavy metal in the dehydrated mud cake can be obviously reduced, so that the resource utilization can be realized.
The nutrient soil prepared by the invention organically combines inorganic nutrient elements, organic matters and microbial bacteria into a whole, embodies the comprehensive effect of inorganic chemical fertilizers, organic fertilizers and microbial fertilizers, and is a first-push fertilizer for dissolving soil hardening phenomenon, repairing and conditioning soil, improving the utilization rate of chemical fertilizers and improving the quality and yield of fruits.
Drawings
FIG. 1 is a schematic structural diagram of a system for harmless preparation of nutrient soil from biochemical sludge provided by the invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1: the embodiment discloses a biochemical sludge treatment system, which comprises: the device comprises an intelligent control unit, a pretreatment unit, a hydrolysis heat treatment unit, a filter-pressing dehydration unit and a nutrient soil preparation unit.
The intelligent control unit is respectively in control connection with the pretreatment unit, the hydrolysis heat treatment unit, the filter-pressing dehydration unit and the nutrient soil preparation unit.
It should be noted that: the intelligent control unit can be a remote PC or other control terminal, such as a remote computer room, and the sensors and monitoring equipment are reasonably arranged in the system plant to collect data.
The pretreatment unit can be controlled by the intelligent control unit to carry out intelligent homogeneous pretreatment on biochemical sludge to be treated so as to respectively obtain organic sludge and inorganic garbage;
specifically, the pretreatment unit and the device can convey the obtained organic sludge to the hydrothermolysis treatment unit.
The hydrothermal treatment unit can carry out hydrothermal treatment on the organic sludge to obtain harmless sludge.
The hydrothermal treatment unit can convey harmless sludge to the filter-pressing dehydration unit.
The filter-pressing dehydration unit can treat innoxious sludge to obtain mud cakes and filter residues.
The filter-pressing dehydration unit can convey obtained mud cakes and filter residues to the nutrient soil preparation unit for preparing and obtaining nutrient soil.
The hydrolysis heat treatment unit described in this embodiment includes: feed bin, feed tank, heating jar and steam generator.
The feeding bin is used for storing biochemical sludge and can transmit the internally stored biochemical sludge to the feeding tank according to the requirement.
The feeding tank is used for storing biochemical sludge to be treated and can transmit the internally stored biochemical sludge to the heating tank as required;
the steam generator is used for generating steam and guiding the generated steam into the heating tank according to requirements so as to heat biochemical sludge in the heating tank.
It should be noted that: the steam generator is controlled by the intelligent control unit to generate the required steam for heating the sludge in the heating tank.
The biochemical sludge in the heating tank can achieve the purpose of harmless treatment through hydrothermal reaction and biochemical reaction.
The hydrothermal reaction is a technology that sludge is placed in a closed reaction kettle and heated to a certain temperature for hydrolysis reaction, colloid structures in microbial cells in the sludge are destroyed and viscous organic matters are hydrolyzed under the combined action of the process and pressure, the binding effect of sludge particles on water molecules is reduced, the water distribution in the sludge is fundamentally changed, and therefore the dehydration performance and the anaerobic digestion performance are improved, and the technology is also called thermal conditioning.
The feeding bin is provided with a feeding hole and a discharging hole.
The feed inlet is communicated with the pretreatment unit; the discharge port is communicated with the feeding tank.
In detail, a first conveying pipeline is arranged between the feeding tank and the heating tank; a second conveying pipeline is arranged between the steam generator and the heating tank; the feed tank delivers organic sludge to the heating tank through the first delivery conduit.
The steam generator can deliver steam into the heating tank through the second delivery pipe.
The hydrolysis heat treatment unit in this embodiment further includes: a diaphragm pump.
The diaphragm pump is located on the first conveying pipe between the feed tank and the heating tank;
the feed tank delivers organic sludge into the heating tank by means of the power of the diaphragm pump.
The press filtration dewatering unit described in this embodiment comprises: plate and frame filter press, hydraulic pump and air compressor machine.
And a third conveying pipeline is arranged between the heating tank and the plate-and-frame filter press. The hydraulic pump with the air compressor machine homoenergetic is for the plate and frame filter press provides drive power for accomplish and carry out the filter-pressing to innoxious mud and handle.
The nutrient soil preparation unit in this embodiment includes: the device comprises a mud cake conveying device, a mud cake crusher, a biological bacterium blending agent storage device and a mixing and stirring device;
the mud cake conveying device is in butt joint with the plate-and-frame filter press and can convey mud cakes and filter residues prepared in the plate-and-frame filter press to the mud cake crusher;
the mud cake crusher can crush and polish mud cakes and filter residues into mud powder and can convey the mud powder into the mixing and stirring tank;
the biological bacteria blender storage tank can provide a biological bacteria blender for the mixing and stirring device to prepare nutrient soil.
In this embodiment, the first conveying pipeline, the second conveying pipeline and the third conveying pipeline are respectively provided with a first intelligent control valve, a second intelligent control valve and a third intelligent control valve.
The first intelligent control valve, the second intelligent control valve and the third intelligent control valve are respectively used for controlling the opening and closing of the first conveying pipeline, the second conveying pipeline and the third conveying pipeline.
The intelligent control unit is also respectively in control connection with the first intelligent control valve, the second intelligent control valve, the third intelligent control valve, the diaphragm pump, the plate-and-frame filter press, the hydraulic pump, the air compressor, the mud cake conveying device, the mud cake crusher, the biological bacterium blending and storing device and the mixing and stirring device.
The embodiment also provides a method for preparing nutrient soil based on the nutrient soil system prepared by harmless biochemical sludge in the embodiment, which comprises the following steps:
s1, intelligent homogenizing pretreatment: putting biochemical sludge to be treated into a pretreatment unit, and performing impurity removal, crushing, homogenizing and slurrying in an integrated process to obtain organic sludge;
s2, carrying out hydrothermal decomposition treatment: putting the organic sludge in the S1 into a feeding bin, starting an intelligent control unit, and conveying the organic sludge in the feeding bin into a heating tank through a feeding tank for hydrothermal treatment to obtain harmless sludge;
s3, filter pressing dehydration treatment: conveying the harmless sludge to a filter-pressing dehydration unit for filter-pressing dehydration to obtain mud cakes and filter residues, and conveying the obtained mud cakes and filter residues to a mud cake crushing device through a mud cake conveying device;
s4, crushing treatment: the mud cake crushing device crushes and polishes the obtained mud cakes and filter residues into mud powder, and conveys the mud powder into a mixing and stirring tank;
s5, mixing and stirring treatment: the biological bacterium blending agent storage tank is controlled by the intelligent control unit to convey the biological bacterium blending agent into the mixing and stirring tank according to a proper proportion, and the mixing and stirring tank can uniformly stir the mud powder and the biological bacterium blending agent to obtain the nutrient soil.
The temperature of the hydrothermal hydrolysis reaction in the step S2 in this example is 180 ℃ to 200 ℃;
the cycle of the hydrothermolysis reaction in the step S2 is 4 hours;
the water content of the detoxified sludge in the step S2 is 80%.
In this embodiment, the step S3 further includes:
cooling the sludge input into the filter-pressing dehydration unit to below 90 ℃, then starting a hydraulic pump, pressing a plate frame of a plate-frame filter press to a compact state, and then closing the hydraulic pump;
and starting the diaphragm pump, keeping corresponding feeding pressure, pumping the sludge into the filter press, closing the diaphragm pump after the sludge is completely pressed in, starting the air compressor, performing secondary squeezing, starting the hydraulic pump, slowly loosening the filter frame of the filter press, and unloading sludge cakes and filter residues.
The biological bacteria blending agent in step S5 in this embodiment includes: one or more of rhizobium inoculant, azotobacter inoculant, phosphorus dissolving inoculant, silicate inoculant, mycorrhizal inoculant, photosynthetic inoculant, organic material decomposing inoculant, composite inoculant and soil remediation inoculant.
In this example, 3 batches of sludge (water content of 80%) of about 0.6t were selected for system debugging. The system parameters are adjusted by detecting the change of the water content before and after the sludge treatment, and finally, the optimized process parameters under the stable and efficient operation condition of the system are obtained.
The best operating parameters of the system are obtained by the debugging: (1) the water content of the sludge is about 80%, the sludge is uniform, the sludge enters a heating tank after mechanical homogenization, and the sludge is kept for a certain time after the steam valve parameters are set and the sludge is automatically heated to the set temperature; (2) cooling the sludge to below 90 ℃; (3) the hydraulic pump is started, the plate frame of the plate-and-frame filter press is pressed to a compact state, the hydraulic pump is closed, the diaphragm pump is started, corresponding feeding pressure is kept, the sludge is pumped into the filter press, after the sludge is completely pressed in, the diaphragm pump is closed, the air compressor is started, secondary squeezing is carried out, the hydraulic pump is started, and the filter frame of the filter press is slowly loosened and the sludge cake is discharged.
Sludge reduction and resource effect
A total of 7 batches of sludge were reduced. The test data are shown in the table.
TABLE 1 sludge weight change of moisture content and contaminant content before and after sludge treatment in 7-family sewage plant in test stage
As can be seen from Table 1, the sludge treatment technique is widely applicable to the direct treatment of dewatered sludge in large-scale Foshan sewage plants. The water content of the treated sludge is reduced to below 50 percent, and the dewatering decrement proportion is 70 to 80 percent. The concentration of the sludge residue pollutants reaches the corresponding regulation of GB4284-2018, and the requirements of sludge stabilization treatment are met. The dewatering and reducing effects of the four municipal sludge and the two printing and dyeing mill sludge are very obvious.
According to the initial data detected by a third party, all the pollutants of the sludge residue reach the GB 4284-2018A-level argillaceous requirement for removing arsenic.
The nutrient soil prepared in the embodiment can be applied to flowers, lawns and the like, can be far away from a food chain, can digest biochemical sludge nearby, and can reduce the dosage of chemical fertilizers. The nutrient soil can also be used for application of forest land, and experiments show that: after a period of application, the height and diameter of the forest trees increase with the amount of the nutrient soil applied.
Claims (10)
1. A nutrient soil system is prepared in innoxious of biochemical mud, its characterized in that includes: the system comprises an intelligent control unit, a pretreatment unit, a hydrolysis heat treatment unit, a filter-pressing dehydration unit and a nutrient soil preparation unit;
the intelligent control unit is respectively in control connection with the pretreatment unit, the hydrolysis heat treatment unit, the filter-pressing dehydration unit and the nutrient soil preparation unit;
the pretreatment unit can be controlled by the intelligent control unit to carry out intelligent homogeneous pretreatment on biochemical sludge to be treated so as to respectively obtain organic sludge and inorganic garbage;
the pretreatment unit and the hydrothermal treatment unit can convey the obtained organic sludge to the hydrothermal treatment unit;
the hydrothermal treatment unit can carry out hydrothermal treatment on the organic sludge to obtain harmless sludge;
the hydrothermal treatment unit can convey harmless sludge to the filter-pressing dehydration unit;
the filter-pressing dehydration unit can treat harmless sludge to obtain mud cakes and filter residues;
the filter-pressing dehydration unit can convey obtained mud cakes and filter residues to the nutrient soil preparation unit for preparing and obtaining nutrient soil.
2. The nutrient soil system for harmless preparation of biochemical sludge according to claim 1, wherein the hydrolysis heat treatment unit comprises: the device comprises a feeding bin, a feeding tank, a heating tank and a steam generator;
the feeding bin is used for storing biochemical sludge and can transmit the internally stored biochemical sludge to the feeding tank according to the requirement;
the feeding tank is used for storing biochemical sludge to be treated and can transmit the internally stored biochemical sludge to the heating tank as required;
the steam generator is used for generating steam and guiding the generated steam into the heating tank according to requirements so as to heat biochemical sludge in the heating tank;
the biochemical sludge in the heating tank can achieve the purpose of harmless treatment through hydrothermal reaction and biochemical reaction;
a feed inlet and a discharge outlet are formed in the feed bin;
the feed inlet is communicated with the pretreatment unit;
the discharge port is communicated with the feeding tank.
3. The nutrient soil system for harmless production of biochemical sludge according to claim 2,
a first conveying pipeline is arranged between the feeding tank and the heating tank;
a second conveying pipeline is arranged between the steam generator and the heating tank;
the feed tank conveys organic sludge through the first conveying pipe into the heating tank;
the steam generator can deliver steam into the heating tank through the second delivery pipe.
4. The nutrient soil system for harmless production of biochemical sludge according to claim 3,
the hydrolysis heat treatment unit further includes: a diaphragm pump;
the diaphragm pump is located on the first conveying pipe between the feed tank and the heating tank;
the feed tank delivers organic sludge into the heating tank by means of the power of the diaphragm pump.
5. The nutrient soil system prepared by innocent treatment of biochemical sludge according to claim 4,
the filter-pressing dehydration unit comprises: plate-and-frame filter presses, hydraulic pumps and air compressors;
a third conveying pipeline is arranged between the heating tank and the plate-and-frame filter press;
the hydraulic pump with the air compressor machine homoenergetic is for the plate and frame filter press provides drive power for accomplish and carry out the filter-pressing to innoxious mud and handle.
6. The nutrient soil system prepared by innocent treatment of biochemical sludge according to claim 5,
the nutrient soil preparation unit comprises: the device comprises a mud cake conveying device, a mud cake crusher, a biological bacterium blending agent storage device and a mixing and stirring device;
the mud cake conveying device is in butt joint with the plate-and-frame filter press and can convey mud cakes and filter residues prepared in the plate-and-frame filter press to the mud cake crusher;
the mud cake crusher can crush and polish mud cakes and filter residues into mud powder and can convey the mud powder into the mixing and stirring tank;
the biological bacteria blender storage tank can provide a biological bacteria blender for the mixing and stirring device to prepare nutrient soil.
7. The nutrient soil system prepared by innocent treatment of biochemical sludge according to claim 6,
a first intelligent control valve, a second intelligent control valve and a third intelligent control valve are respectively arranged on the first conveying pipeline, the second conveying pipeline and the third conveying pipeline;
the first intelligent control valve, the second intelligent control valve and the third intelligent control valve are respectively used for controlling the opening and closing of the first conveying pipeline, the second conveying pipeline and the third conveying pipeline;
the intelligent control unit is also respectively in control connection with the first intelligent control valve, the second intelligent control valve, the third intelligent control valve, the diaphragm pump, the plate-and-frame filter press, the hydraulic pump, the air compressor, the mud cake conveying device, the mud cake crusher, the biological bacterium blending and storing device and the mixing and stirring device.
8. A method for preparing nutrient soil based on a nutrient soil system prepared by innocent treatment of biochemical sludge according to any one of claims 1 to 7, comprising the steps of:
s1, intelligent homogenizing pretreatment: putting biochemical sludge to be treated into a pretreatment unit, and performing impurity removal, crushing, homogenizing and slurrying in an integrated process to obtain organic sludge;
s2, carrying out hydrothermal decomposition treatment: putting the organic sludge in the S1 into a feeding bin, starting an intelligent control unit, and conveying the organic sludge in the feeding bin into a heating tank through a feeding tank for hydrothermal treatment to obtain harmless sludge;
s3, filter pressing dehydration treatment: conveying the harmless sludge to a filter-pressing dehydration unit for filter-pressing dehydration to obtain mud cakes and filter residues, and conveying the obtained mud cakes and filter residues to a mud cake crushing device through a mud cake conveying device;
s4, crushing treatment: the mud cake crushing device crushes and polishes the obtained mud cakes and filter residues into mud powder, and conveys the mud powder into a mixing and stirring tank;
s5, mixing and stirring treatment: the biological bacterium blending agent storage tank is controlled by the intelligent control unit to convey the biological bacterium blending agent into the mixing and stirring tank according to a proper proportion, and the mixing and stirring tank can uniformly stir the mud powder and the biological bacterium blending agent to obtain the nutrient soil.
9. The method for preparing nutrient soil according to claim 8,
the temperature of the hydrothermal hydrolysis reaction in the step S2 is 180-200 ℃;
the cycle of the hydrothermolysis reaction in the step S2 is 4 hours;
the water content of the harmless sludge in the step S2 is 80%;
the step S3 further includes: cooling the sludge input into the filter-pressing dehydration unit to below 90 ℃, then starting a hydraulic pump, pressing a plate frame of a plate-frame filter press to a compact state, and then closing the hydraulic pump; and starting the diaphragm pump, keeping corresponding feeding pressure, pumping the sludge into the filter press, closing the diaphragm pump after the sludge is completely pressed in, starting the air compressor, performing secondary squeezing, starting the hydraulic pump, slowly loosening the filter frame of the filter press, and unloading sludge cakes and filter residues.
10. The method for preparing nutrient soil according to claim 8,
the biological bacteria blending agent in the step S5 comprises: one or more of rhizobium inoculant, azotobacter inoculant, phosphorus dissolving inoculant, silicate inoculant, mycorrhizal inoculant, photosynthetic inoculant, organic material decomposing inoculant, composite inoculant and soil remediation inoculant.
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