CN117303709A - Preparation method, application and comprehensive utilization method of expanded sludge conditioner for rapid and natural drying of sludge - Google Patents
Preparation method, application and comprehensive utilization method of expanded sludge conditioner for rapid and natural drying of sludge Download PDFInfo
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- CN117303709A CN117303709A CN202311492369.4A CN202311492369A CN117303709A CN 117303709 A CN117303709 A CN 117303709A CN 202311492369 A CN202311492369 A CN 202311492369A CN 117303709 A CN117303709 A CN 117303709A
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- 239000010802 sludge Substances 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000001035 drying Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000002893 slag Substances 0.000 claims abstract description 57
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 9
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010790 dilution Methods 0.000 claims abstract description 6
- 239000012895 dilution Substances 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 230000001143 conditioned effect Effects 0.000 claims abstract description 4
- 238000003860 storage Methods 0.000 claims description 66
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 239000002912 waste gas Substances 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 230000029087 digestion Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 230000001580 bacterial effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 8
- 239000002910 solid waste Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
-
- 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 discloses a preparation method, application and comprehensive utilization method of an expanded sludge conditioner for rapid and natural drying of sludge. The municipal sludge obtained after dilution is evenly sprayed onto high-temperature blast furnace slag through a spraying device, and is rapidly expanded into a sludge conditioner with a porous structure, the spraying device is refitted into a blast furnace slag treatment workshop after the original blast furnace ironmaking/steelmaking process, when the conditioner is applied, municipal sludge to be conditioned is added into sodium hypochlorite solid, and then the expanded sludge conditioner is added, so that rapid and natural drying of the municipal sludge can be realized. The conditioner can quickly change the surface structure of the sludge, destroy the bacterial structure, quickly reduce the water content of the sludge from 95% to below 40%, and is a method for preparing waste by waste without causing secondary pollution.
Description
Technical Field
The invention belongs to the field of sludge treatment and disposal, and particularly relates to a preparation method, application and comprehensive utilization method of an expanded sludge conditioner for rapid and natural drying of sludge.
Background
Steel is a solid solution of elements such as carbon, silicon, manganese and the like in iron, and is used for improving the performance of the steel to meet the requirements of engineering building materials, and other elements such as phosphorus, sulfur, oxygen, hydrogen, nitrogen and the like exist in most of the steel to deteriorate the performance of the steel, so that the impurities are removed through chemical reaction in steelmaking, and the steel is cast into qualified steel ingots.
Blast furnace slag is a solid waste formed from gangue in ores, ash in fuels and non-volatile components in solvents (typically limestone) in blast furnace ironmaking processes. The blast furnace slag mainly contains oxides of calcium, silicon, aluminum, magnesium, iron and a small amount of sulfides. An industrial solid waste of blast furnace slag. Slag discharged during blast furnace ironmaking, also called blast furnace slag, can be classified into steelmaking iron-producing slag, casting iron-producing slag, ferromanganese slag, etc. According to the different ore grades, 0.3-1 ton of slag is discharged from each 1 ton of iron, and the lower the ore grade is, the larger the slag discharge amount is. The steel slag production amount of 707 ten thousand tons is counted in the 1 st month of 2023 issued by China iron and steel industry association, and the steel slag production amount is increased by 0.8% in the same ratio. The production amount of the blast furnace slag is 1907 ten thousand tons, and the same ratio is increased by 3.7 percent. Sulfur exists in slag in a variety of sulfide forms, with several major sulfides ranging from small to large in their stability being FeS, mnS, mgS, caS, with FeS also being soluble in molten iron. The desulfurization reaction of slag is that basic oxides such as CaO and MgO in slag react with sulfur in molten iron to generate stable compounds CaS, mgS and the like which are insoluble in molten iron and soluble in slag, so that the sulfur in molten iron is transferred into slag to be removed. In GB5085 of the colored industrial solid waste pollution control Standard, the pH value is less than or equal to 2.0 or more than or equal to 12.5, and the waste is judged to be harmful. The pH range of the blast furnace slag is 8-12.
The statistics shows that the total sewage treatment amount in China is about 2 hundred million tons/day, the roughly calculated wet sludge generation amount is about 20 ten thousand tons/day, and the yield is remarkable. The annual municipal sludge yield in 2020 reaches 6000 to 9000 kilotons, and the anaerobic digestion sludge accounts for 20 percent.
Blast furnace slag and municipal sludge are large solid wastes to be solved urgently in China, and the realization of resource utilization is the best way for treating the two large solid wastes.
Disclosure of Invention
The invention provides a conditioner for realizing the resource utilization of blast furnace slag and municipal sludge, and aims to provide a conditioner for quickly and naturally drying sludge, and a preparation method and application thereof.
The invention is realized by the following technical scheme:
the preparation method of the expanded sludge conditioner for rapid and natural drying of sludge comprises the following steps:
1) feeding high-temperature blast furnace slag downwards from a slag inlet (1) into a mixing cavity (2), spraying diluted sludge onto the high-temperature blast furnace slag in the mixing cavity (2) through two high-pressure sludge inlets (3) which are respectively communicated with two sides of the mixing cavity (2), and carrying out partial modification on the diluted sludge;
2) The high-temperature blast furnace slag after the sludge is sprayed naturally falls into a product outlet chamber (4);
3) The condensed water is sprayed onto the high-temperature blast furnace slag falling into the product outlet chamber (4) through two condensed water spray ports (6) which are respectively communicated with the two sides of the product outlet chamber (4);
4) And (5) the high-temperature and high-slag falls from an outlet of the product outlet chamber (4) to obtain the expanded sludge conditioner.
In the technical scheme, the unmodified high-temperature blast furnace slag in the expanded sludge conditioner accounts for 3-8% of the expanded sludge conditioner.
In the technical scheme, the sludge is anaerobic sludge with the solid content of 8-12% after being diluted by water or is directly sprayed by using anaerobic digestion liquid.
In the technical scheme, the temperature of the high-temperature high-slag is more than or equal to 500 ℃.
In the above technical scheme, the mass ratio of the sludge dry basis to the high-temperature high-slag before dilution is (0.4-0.6): 5.
In the technical scheme, the injection pressure of the high-pressure sludge inlet (3) is 0.5 Mpa-1.0 Mpa, and the intermittent injection mode is adopted, and the injection is stopped for 2 s-5 s for 1 min.
In the technical scheme, the injection pressure of the condensed water injection port (6) is 0.4 Mpa-0.6 Mpa, continuous injection is adopted, and the pipe diameter of the condensed water injection port (6) is 25 mm-40 mm.
In the technical scheme, the vertical distance between the high-pressure sludge inlet (3) and the condensed water jet orifice (6) on the same side is 2 m-2.5 m.
A comprehensive utilization method of waste gas and waste water generated in the preparation process of an expanded sludge conditioner comprises the following steps:
1) The comprehensive utilization method of the waste gas comprises the following steps:
acid waste gas generated by iron works or steel works processes is discharged to two first condensate water storage chambers (5) positioned at two sides of a production chamber (4) for absorption;
providing two second condensate water storage chambers (7), each second condensate water storage chamber (7) comprising a first storage bin and a second storage bin;
waste gas discharged from the two first condensate water storage chambers (5) and waste gas discharged from the product discharge chambers (4) are respectively conveyed to first storage bins of the two second condensate water storage chambers (7) for absorption;
the waste gas discharged from the two second condensed water storage chambers (7) and the waste gas discharged from the mixing chamber (2) are collected and treated together and then discharged after reaching standards;
2) The comprehensive utilization method of the wastewater comprises the following steps:
the condensed water generated by the two high-pressure sludge inlets (3) is respectively conveyed to the two first condensed water storage chambers (5) and the second storage bins of the two second condensed water storage chambers (7) after being collected;
the condensed water in the product outlet chamber (4) is respectively conveyed to two first condensed water storage chambers (5) after being collected;
the concentrated gas absorption liquid uses two first condensed water storage chambers (5) waste water, when SS reaches 8000-10000mg/L and pH is 6.5-8.5, the concentrated gas absorption liquid can be used as the injection liquid of two high-pressure sludge inlets (3).
In the technical scheme, when the pH value of the condensed water in the two first storage bins is smaller than 6, the condensed water in the two first storage bins is respectively conveyed to the two first condensed water storage chambers (5), and meanwhile, the second storage bins supplement the condensed water to the first storage bins; and when the pH value of the condensed water in the second storage bin reaches 6-9, discharging.
In the technical scheme, the volume ratio of the condensed water in the first storage bin to the condensed water in the second storage bin is 1:4.
The application of the expanded sludge conditioner is characterized in that sodium hypochlorite solid is added into municipal sludge to be conditioned, and then the expanded sludge conditioner prepared by the preparation method is added, so that the municipal sludge is dried quickly and naturally.
In the technical scheme, the adding mass of sodium hypochlorite solid in municipal sludge is 5-7% of the dry basis mass of municipal sludge, and the adding amount of the expanded sludge conditioner is 1.5-5% of the dry basis mass of municipal sludge.
The working principle of the invention is as follows:
the blast furnace slag comprises substances such as calcium oxide, calcium sulfite and the like, belongs to a large amount of industrial solid waste, has high annual disposal cost, and has the pH value of 11-13. Municipal sludge has high organic matter content, difficult wall breaking of the sludge, and the sludge treatment process method mostly generates odor and nondegradable wastewater, namely, the generated secondary pollution is large. The high-temperature blast furnace slag and municipal sludge are mixed and then quickly expanded into a porous structure, and the high solid content and the tiny bacterial structure of the sludge just have the advantage that the high-temperature blast furnace slag forms the porous structure, so that the method is suitable for preparing the sludge conditioner. In addition, the generated waste water and waste gas can intercept solid matters according to the process characteristics, so that the waste water and waste gas which are difficult to treat can be reduced as much as possible, particles in the waste gas and suspended matters in the waste water are completely mixed into the preparation of the sludge conditioner through the transformation of the process flow, the whole process flow is light in pollution, the waste water accords with the nano tube standard, and the waste gas particles, gas indexes with acid-base indexes and odor indexes are possibly absorbed in the process flow; the viscosity of the sludge is greatly improved along with the increase of the solid content, and the solid content is generally higher than 12 percent, so that the sludge is not in a flowing state. The high-temperature high-slag is directly prepared by using sludge slurry (also can dilute the sludge), so that the problem that the sludge slurry is difficult to treat can be solved, and the gas and part of water vapor in the slag are fixed, thereby being beneficial to preparing the expanded porous sludge conditioner.
When the method is applied, sodium hypochlorite solid is added into sludge to pre-modify protein hydrophilicity, and the expanded sludge conditioner can be used as a sludge dispersing agent, so that the sludge is directly dried and stabilized in situ, the drying and stabilizing speed is very high, meanwhile, blast furnace slag is consumed, and the recycling utilization among large amounts of solid waste is realized.
The beneficial effects of the invention are as follows:
the invention provides a conditioning agent for quick and natural drying of sludge, a preparation method and application thereof, wherein the conditioning agent can quickly change the surface structure of the sludge, destroy the bacterial structure, and quickly reduce the water content of the sludge from 95% to below 40%, thereby being a method for preparing waste by waste and simultaneously not causing secondary pollution.
Drawings
Fig. 1 is a schematic view of a structure of a spraying device in the present invention.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be further described below by means of specific embodiments in combination with the accompanying drawings of the specification.
Example 1
The embodiment provides a preparation method of an expanded sludge conditioner for rapid and natural drying of sludge, which is shown in combination with fig. 1 and comprises the following steps:
1) The high-temperature blast furnace slag is sent downwards into a mixing cavity 2 from a slag inlet 1, diluted sludge is sprayed onto the high-temperature blast furnace slag in the mixing cavity 2 through two high-pressure sludge inlets 3 which are respectively communicated with two sides of the mixing cavity 2, and partial modification is carried out on the diluted sludge;
2) The high-temperature blast furnace slag after the sludge is sprayed naturally falls into a product outlet chamber 4;
3) The condensed water is sprayed onto the high-temperature blast furnace slag falling to the product outlet chamber 4 through two condensed water spray ports 6 respectively communicated with the two sides of the product outlet chamber 4;
4) And (5) the high-temperature and high-slag falls from the outlet of the product outlet chamber 4 to obtain the expanded sludge conditioner.
The expanded sludge conditioner is mainly applied to sludge drying with pH value being more than 4 and less than or equal to 8.
The diluted sludge used in the step 1) is anaerobic sludge with solid content of 8-12% after being diluted by water or is directly sprayed by using anaerobic digestion liquid. In this example, a municipal sludge treatment plant with a solids content of 8% was dewatered and left with an intractable sludge slurry. The mass ratio of the sludge dry basis to the high-temperature high-slag before dilution is (0.4-0.6): 5.
In this example, the temperature of the high-temperature blast furnace slag is not less than 500 ℃.
The injection pressure of the high-pressure sludge inlet 3 sludge is 0.5 Mpa-1.0 Mpa, and the intermittent injection mode is adopted, and the injection is stopped for 2 s-5 s for 1 min. The injection pressure of the condensed water from the condensed water injection port 6 is 0.4 Mpa-0.6 Mpa, continuous injection is adopted, and the pipe diameter of the condensed water injection port 6 is 25 mm-40 mm. In this embodiment, the injection pressure of the high-pressure sludge inlet 3 sludge is 0.8Mpa, the intermittent injection mode is to perform injection for 1min and pause for 5s, and the internal structures on two sides realize jet flow through pipeline contraction.
In the present embodiment, the vertical distance between the high pressure sludge inlet 3 and the condensed water injection port 6 on the same side is 2m to 2.5m.
In the embodiment, a water truck skip bucket structure is arranged in the product outlet chamber 4, and the impurity content in the expanded sludge conditioner falling from the outlet of the product outlet chamber 4 is 3-8wt%, wherein the impurity is mainly unmodified high-temperature blast furnace slag.
It can be understood that the injection device for sludge injection of the invention can be modified in the blast furnace slag treatment workshop after the original blast furnace ironmaking/steelmaking process, the blast furnace slag falls into the mixing cavity 2 through inlet gravity/pressurization, and the high-pressure sludge inlet 3 and the inlet 1 on both sides are simultaneously started and stopped, and simultaneously pressurized and injected to high-temperature blast furnace slag.
Example 2
The present embodiment also provides an application of the expanded sludge conditioner of embodiment 1, specifically: and adding sodium hypochlorite solid into municipal sludge to be conditioned, and then adding the expanded sludge conditioner prepared in the embodiment 1 to realize rapid and natural drying of municipal sludge.
Wherein the adding mass of sodium hypochlorite solid in municipal sludge is 5-7% of the dry mass of municipal sludge, and the adding amount of the expanded sludge conditioner is 1.5-5% of the dry mass of municipal sludge.
The specific application is as follows:
and adding 5% of sodium hypochlorite solid into municipal sludge, and then adding 5% of expanded sludge conditioner to realize rapid natural drying of municipal sludge (the adding proportion is calculated on a dry basis of sludge). The drying effect is that the original 98 percent is rapidly dehydrated, the water content of the sludge cake can reach 38 percent after solid-liquid separation, and the sludge cake can be obtained after the sludge cake is uniformly stirred in the application process for 25 minutes.
Example 3
This example is substantially the same as example 2, except that the expanded sludge conditioner of this example is mainly applied to the field of industrial sludge having pH 4 or less. The drying effect is that the original 98 percent is rapidly dehydrated, the water content of the sludge cake can reach 37 percent after solid-liquid separation, and the sludge cake can be obtained after the sludge cake is uniformly stirred in the application process and the total time is 20 minutes.
Example 4
The embodiment also provides a comprehensive utilization method of waste gas and waste water generated in the preparation process of the expanded sludge conditioner, and the method is continuously combined with fig. 1, and comprises the following steps:
1) The comprehensive utilization method of the waste gas comprises the following steps:
acid waste gas containing acid substances such as hydrogen sulfide generated by iron works or steel works processes is discharged to two first condensate water storage chambers 5 positioned at two sides of the product chamber 4 for absorption;
providing two second condensate water storage chambers 7, each second condensate water storage chamber 7 comprising a first storage bin and a second storage bin;
the waste gas discharged from the two first condensate water storage chambers 5 and the waste gas discharged from the product discharge chamber 4 are respectively conveyed to the first storage bins of the two second condensate water storage chambers 7 for absorption;
the waste gas discharged from the two second condensed water storage chambers 7 and the waste gas discharged from the mixing chamber 2 are collected and treated together to reach the standard and then discharged;
2) The comprehensive utilization method of the wastewater comprises the following steps:
the condensed water generated by the two high-pressure sludge inlets 3 is respectively conveyed to the two first condensed water storage chambers 5 and the second storage bins of the two second condensed water storage chambers 7 after being collected;
the condensed water in the product outlet chamber 4 is collected and then is respectively conveyed to two first condensed water storage chambers 5.
When the pH value of the condensed water in the two first storage bins is smaller than 6, the condensed water in the two first storage bins is respectively conveyed to the two first condensed water storage chambers 5, and meanwhile, the second storage bins supplement the condensed water to the first storage bins; and when the pH value of the condensed water in the second storage bin reaches 6-9, discharging.
Wherein, the volume ratio of the condensed water in the first storage bin to the second storage bin is 1:4.
Wherein, the condensed water of the two first condensed water storage chambers 5 is derived from the condensed water generated at the inlet of the high-pressure sludge, and is alkaline, and hydrogen sulfide and particulate matters are trapped in the two first condensed water storage chambers 5; the hydrogen sulfide and the particulate matters are sprayed in the first condensed water storage chamber 5, the pH value in water is between 4 and 6, if the pH value is less than 4, the water is sprayed after dilution, and if the pH value is greater than 6, the supernatant liquid after precipitation is taken to the second storage bin for direct discharge.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (10)
1. The preparation method of the expanded sludge conditioner for rapid and natural drying of sludge is characterized by comprising the following steps:
1) feeding high-temperature blast furnace slag downwards from a slag inlet (1) into a mixing cavity (2), spraying diluted sludge onto the high-temperature blast furnace slag in the mixing cavity (2) through two high-pressure sludge inlets (3) which are respectively communicated with two sides of the mixing cavity (2), and carrying out partial modification on the diluted sludge;
2) The high-temperature blast furnace slag after the sludge is sprayed naturally falls into a product outlet chamber (4);
3) The condensed water is sprayed onto the high-temperature blast furnace slag falling into the product outlet chamber (4) through two condensed water spray ports (6) which are respectively communicated with the two sides of the product outlet chamber (4);
4) And (5) the high-temperature and high-slag falls from an outlet of the product outlet chamber (4) to obtain the expanded sludge conditioner.
2. The method for preparing the expanded sludge conditioner according to claim 1, wherein the content of impurities in the expanded sludge conditioner is 3% -8%.
3. The method for preparing the expanded sludge conditioner according to claim 1, wherein the sludge is anaerobic sludge with a solid content of 8% -12% after dilution with water or is directly sprayed with an anaerobic digestion solution.
4. The method of producing an expanded sludge conditioner according to claim 1, wherein a mass ratio of the sludge dry matter to the high-temperature and high-slag before dilution is (0.4 to 0.6): 5.
5. The method for preparing the expanded sludge conditioner according to claim 1, wherein the injection pressure of the high-pressure sludge inlet (3) is 0.5Mpa to 1.0Mpa, and the intermittent injection mode is adopted, and the injection is suspended for 1min for 2s to 5s.
6. The preparation method of the expanded sludge conditioner according to claim 1, wherein the injection pressure of the condensed water injection port (6) is 0.4Mpa to 0.6Mpa, continuous injection is adopted, and the pipe diameter of the condensed water injection port (6) is 25mm to 40mm.
7. The comprehensive utilization method of waste gas and waste water generated in the preparation process of the expanded sludge conditioner according to claim 1, comprising the following steps:
1) The comprehensive utilization method of the waste gas comprises the following steps:
acid waste gas generated by iron works or steel works processes is discharged to two first condensate water storage chambers (5) positioned at two sides of a production chamber (4) for absorption;
providing two second condensate water storage chambers (7), each second condensate water storage chamber (7) comprising a first storage bin and a second storage bin;
waste gas discharged from the two first condensate water storage chambers (5) and waste gas discharged from the product discharge chambers (4) are respectively conveyed to first storage bins of the two second condensate water storage chambers (7) for absorption;
the waste gas discharged from the two second condensed water storage chambers (7) and the waste gas discharged from the mixing chamber (2) are collected and treated together and then discharged after reaching standards;
2) The comprehensive utilization method of the wastewater comprises the following steps:
the condensed water generated by the two high-pressure sludge inlets (3) is respectively conveyed to the two first condensed water storage chambers (5) and the second storage bins of the two second condensed water storage chambers (7) after being collected;
the condensed water in the product outlet chamber (4) is respectively conveyed to two first condensed water storage chambers (5) after being collected.
8. The comprehensive utilization method according to claim 7, wherein when the pH value of the condensed water in the two first storage bins is less than 6, the condensed water in the two first storage bins is respectively transported to the two first condensed water storage chambers (5), and the second storage bins supply the condensed water to the first storage bins; and when the pH value of the condensed water in the second storage bin reaches 6-9, discharging.
9. The use of the expanded sludge conditioner according to claim 1, wherein the rapid natural drying of municipal sludge is achieved by adding sodium hypochlorite solids to the municipal sludge to be conditioned and then adding the expanded sludge conditioner prepared by the preparation method according to any one of claims 1 to 6.
10. The use according to claim 9, wherein the mass of sodium hypochlorite solids added to municipal sludge is 5-7% of the mass of municipal sludge dry basis, and the mass of the expanded sludge conditioner is 1.5-5% of the mass of municipal sludge dry basis.
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| JPH06170398A (en) * | 1992-12-10 | 1994-06-21 | Nippon Steel Corp | Treatment of sludge containing blast furnace water slag in activated sludge treatment |
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| CN106220219A (en) * | 2016-07-27 | 2016-12-14 | 北京大学 | With environment friendly pervious brick that blast furnace slag and mud are prepared for major ingredient and preparation method thereof |
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| CN116636439A (en) * | 2023-06-06 | 2023-08-25 | 中原环保股份有限公司 | Greening soil prepared from sludge incinerator slag and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06170398A (en) * | 1992-12-10 | 1994-06-21 | Nippon Steel Corp | Treatment of sludge containing blast furnace water slag in activated sludge treatment |
| KR20090032602A (en) * | 2007-09-28 | 2009-04-01 | 주식회사 제원에이스산업 | The method that drying sludge of the type of ventury ejector using difference between air current and atmospheric pressure |
| CN103014201A (en) * | 2013-01-18 | 2013-04-03 | 北京科技大学 | Device and method for gas-solid ejection and granulation of molten blast furnace slags |
| CN106220219A (en) * | 2016-07-27 | 2016-12-14 | 北京大学 | With environment friendly pervious brick that blast furnace slag and mud are prepared for major ingredient and preparation method thereof |
| TW202206606A (en) * | 2020-07-31 | 2022-02-16 | 中國商寶山鋼鐵股份有限公司 | Integrated drying process and device for dry granulated slag and sludge |
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