CN114212965B - Treatment process for municipal sludge wall breaking conditioning double-circulation deep dehydration - Google Patents
Treatment process for municipal sludge wall breaking conditioning double-circulation deep dehydration Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 282
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000018044 dehydration Effects 0.000 title claims abstract description 26
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 208000005156 Dehydration Diseases 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 230000001143 conditioned effect Effects 0.000 claims abstract description 18
- 239000003463 adsorbent Substances 0.000 claims abstract description 13
- 239000002351 wastewater Substances 0.000 claims description 35
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 22
- 239000013335 mesoporous material Substances 0.000 claims description 22
- 229910052710 silicon Inorganic materials 0.000 claims description 22
- 239000010703 silicon Substances 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000002041 carbon nanotube Substances 0.000 claims description 17
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 17
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004021 humic acid Substances 0.000 claims description 10
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 10
- NHJVRSWLHSJWIN-UHFFFAOYSA-N 2,4,6-trinitrobenzenesulfonic acid Chemical compound OS(=O)(=O)C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O NHJVRSWLHSJWIN-UHFFFAOYSA-N 0.000 claims description 9
- 239000002738 chelating agent Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 8
- 238000007605 air drying Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical group [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000001223 reverse osmosis Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims 1
- 244000005700 microbiome Species 0.000 abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- 210000004027 cell Anatomy 0.000 description 18
- 210000000170 cell membrane Anatomy 0.000 description 10
- 210000002421 cell wall Anatomy 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000011148 porous material Substances 0.000 description 8
- 230000029087 digestion Effects 0.000 description 7
- 230000000813 microbial effect Effects 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
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- 239000012466 permeate Substances 0.000 description 3
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- 238000011105 stabilization Methods 0.000 description 3
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- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 102000004895 Lipoproteins Human genes 0.000 description 2
- 108090001030 Lipoproteins Proteins 0.000 description 2
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- 239000000706 filtrate Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229920006008 lipopolysaccharide Polymers 0.000 description 2
- 208000030159 metabolic disease Diseases 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
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- 229920000867 polyelectrolyte Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
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- 230000002195 synergetic effect Effects 0.000 description 2
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- 241000282414 Homo sapiens Species 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical group [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009279 wet oxidation reaction Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and in particular relates to a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process, which comprises the following steps: step one: carrying out sludge concentration on the primary municipal sludge in a sludge concentration tank; step two: adding a conditioning agent and a guiding agent into the conditioning pool; step three: lifting the conditioned sludge into a vertical sludge wall breaking device through a sludge lifting pump, adding a breaking aid into the sludge wall breaking device, and introducing high-concentration ozone from the lower end of the sludge wall breaking device; step four: adding an adsorbent into the lower sludge conditioning area; step five: the sludge pump pumps the conditioned sludge into a sludge press filter for mechanical dehydration to obtain sludge cakes with the water content of 30-35 percent, and the municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process disclosed by the invention is used for respectively treating microorganisms, organic matters and heavy metals, so that the sludge cakes subjected to mechanical dehydration are harmless, and the environment is not greatly influenced by landfill or incineration.
Description
Technical Field
The invention relates to a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process. Belongs to the technical field of municipal sludge treatment.
Background
With the increase of total sewage treatment amount and treatment standards, sludge treatment and disposal have become bottlenecks restricting the development of sewage treatment plants. As the sewage treatment rate increases, the sludge yield is also increasing, which makes the problem of sludge treatment and disposal more remarkable. After the sludge which is not properly treated and disposed enters the environment, secondary pollution is directly brought to the water body and the atmosphere, so that the effective treatment capacity of a sewage treatment system is reduced, and serious threat is formed to the ecological environment and the activities of human beings.
The purpose of the sludge stabilization treatment is to degrade organic matters in the sludge, further reduce the water content of the sludge, kill bacteria and pathogens in the sludge, eliminate the odor of the sludge and the like. The common methods for stabilizing sludge mainly comprise: anaerobic digestion, aerobic digestion, wet oxidation, low-temperature pyrolysis, composting and other new technologies. The technology for reducing the sludge by ozone oxidation can effectively destroy the structure of the sludge, reduce the mass and the volume of the sludge, and is economical, effective and convenient to operate and manage. For example, CN200910234690.6 proposes a method for promoting sludge reduction by ozone, which is to concentrate the residual sludge of a sewage treatment plant and then pass through a sludge pretreatment reactor, wherein the cell walls and cell membranes of microorganisms in the sludge are broken due to the strong oxidizing property of ozone, and a large amount of organic matters are released from the cells; after ozone treatment, the sludge enters an anaerobic digestion reactor and is subjected to anaerobic digestion in a closed anoxic state; the gas generated by digestion can obtain methane through a gas purifying device; the sludge after anaerobic digestion is flocculated and dehydrated to obtain dehydrated sludge, and the dehydrated sludge is finally treated, such as agricultural fertilizer, brick making, ceramsite or auxiliary fuel of fire coal; the anaerobic supernatant is treated by a biological filter bed process to remove organic matters and ammonia nitrogen in the solution, and can be widely applied to a sludge treatment process of a sewage treatment plant. However, in the invention, ozone oxidation is only a means for pretreating sludge, and although the cell wall and the cell membrane of the sludge can be destroyed, anaerobic digestion is required to be carried out later to thoroughly reduce the sludge, the treatment flow is long, and secondary pollution is easy to cause.
Disclosure of Invention
The invention provides a municipal sludge wall breaking conditioning double-circulation deep dehydration treatment process which reduces the water content of sludge from 98-99% to 25-35%, reduces the volume of the sludge by more than one time, meets the requirements of harmlessness, stabilization and reduction, respectively treats microorganisms, organics and heavy metals, ensures the harmlessness of mechanically dehydrated sludge cakes, and can not greatly influence the environment in landfill or incineration, and solves the problems in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process comprises the following steps:
step one: carrying out sludge concentration on the primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, a conditioning agent and a guiding agent are added into the conditioning tank, the mixing and stirring time is 10-20 minutes, the conditioning agent is 4-8 parts of humic acid and 3-6 parts of sulfuric acid, and the guiding agent is 5-6 parts of hydrogen peroxide and 2-3 parts of ferric trichloride;
fe in ferric trichloride 3+ The hydrolysis capability is strong, mononuclear hydroxyl weak ions can be generated by ferric iron under the condition that the pH value is greater than 1, the ions and the sludge generate electrostatic neutralization to form flocs, the flocs formed by ferric chloride are smaller, if the sludge is sent into a mechanical dewatering device such as a box-type membrane filter press at this time, the sludge is difficult to be completely trapped by filter cloth, the filtrate is turbid, the treatment effect is poor, the specific gravity of the flocs formed by ferric salt is larger, so that the sedimentation performance is good, and good conditions are created for sludge-water separation.
The pH value of the sludge is regulated by humic acid and sulfuric acid, and the sludge is regulated to a proper pH value environment, so that the wall breaking treatment of microbial cells in the sludge is facilitated, and the wall breaking and dehydration effects are enhanced; then, the microbial cell in the sludge is subjected to effective wall breaking pretreatment under the synergistic effect of the microbial cell and the hydrogen peroxide with strong oxidability; humic acid has the functions of exchange, adsorption, complexation, chelation and the like with metal ions; the polymer is used as polyelectrolyte in a dispersion system, has the functions of coagulation, peptization, dispersion and the like, and can better promote the decomposition of organic matters in sludge.
Step three: lifting conditioned sludge into vertical sludge wall breaking equipment through a sludge lifting pump, adding a breaking aid into the sludge wall breaking equipment, and introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 20mg/L-25mg/L, the inlet air flow is 1.8L/min-2L/min, the wall breaking time is 5-8 minutes, and the breaking aid comprises 2-4 parts of metal chelating agent and 3-6 parts of trinitrobenzene sulfonic acid;
the water content of municipal sludge is about 99%, a viscose phase region is formed between microorganism cells in the municipal sludge and the organic colloid, a large amount of interstitial water can be wrapped, and a large amount of cell water is contained in the microorganism cells. The water is difficult to extrude in a mechanical dehydration mode, the metal chelating agent and the trinitrobenzene sulfonic acid are added into the sludge, so that the cell wall and the cell membrane permeability can be increased, the cell wall and the cell membrane are expanded, the volume is enlarged, expansion is formed, then high-concentration ozone is introduced, the ozone acts on the cell wall and the cell membrane, the action area is wider, the effect is better, the components of the ozone are damaged to cause metabolic disorder, the ozone continuously permeates, the membrane is penetrated to destroy the lipoprotein and the lipopolysaccharide in the membrane to cause cell dissolution and death, and interstitial water and cell water are released to form free water which is easy to remove;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 15-30 minutes, wherein the adsorbent is 1-2 parts of silicon-based mesoporous material attached with carbon nanotubes;
the single-wall carbon nano-tube has the advantages of dispersing and presenting a three-dimensional reticular three-dimensional structure, enriching micropores, small pore diameter, narrow pore diameter distribution, special hollow structure, high specific surface area, low resistivity and the like, the silicon-based mesoporous material has larger specific surface area, ordered pore canal and adjustable pore diameter size, and the silicon-based mesoporous material attached with the carbon nano-tube fully combines the excellent performances of the two materials and improves the adsorption performance of the silicon-based mesoporous material on heavy metals in sludge.
Step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 25-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating the sludge.
And in the fourth step, the sludge conditioned in the lower sludge conditioning area can be lifted to the upper sludge conditioning area by a sludge lifting pump, and the second and third steps are repeated to perform double circulation of sludge wall breaking conditioning.
And in the fifth step, waste water is subjected to reverse osmosis device to collect waste water concentrated solution, the waste water concentrated solution is conveyed to the upper part of the evaporator, is sprayed to the lower part of the evaporator through a material nozzle to be circularly sprayed and concentrated, waste water clear liquid in the waste water concentrated solution is conveyed to a steam cooling pipe through a pipeline and a check valve by adopting negative pressure evaporation, and the steam cooling pipe is circumferentially arranged on the outer wall of the upper sludge conditioning area. And (3) carrying out circulating concentration on the wastewater concentrated solution, and carrying out evaporation crystallization treatment after the wastewater concentrated solution is formed into a high-concentration concentrated solution. The clear liquid is collected by heating the wastewater concentrated solution, steam can provide heat for an upper sludge conditioning area, the treatment effect of a conditioner and a guiding agent on sludge is improved, and the heat is provided to form the clear liquid of wastewater.
In the fifth step, the sludge press filtration is carried out in two steps, wherein the press filtration pressure is controlled to be 15 kg-17 kg in the first step, the time is controlled to be 25-30 minutes, the press filtration pressure is controlled to be 20-25 kg in the second step, and the time is controlled to be 55-60 minutes.
The silicon-based mesoporous material with the attached carbon nano-tubes is obtained by pressurizing flowing carbon nano-tube liquid and the silicon-based mesoporous material to 50-200MPA through a high-pressure pump, performing jet collision through a multi-pipeline jet nozzle, and performing cyclic processing after the flowing carbon nano-tube liquid and the silicon-based mesoporous material collide under high pressure.
The invention has the following advantages and beneficial effects:
the invention relates to a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process, which can reduce the water content of sludge from 98-99% to 25-35%, reduce the volume of sludge by more than one time, meet the requirements of innocuity, stabilization and reduction, regulate the pH value of the sludge, promote the decomposition of organic matters in the sludge at the same time, increase the permeability of cell walls and cell membranes by adding a breaking aid, expand the cell walls and cell membranes, enlarge the volume, form expansion, simultaneously add high-concentration ozone, fully permeate the high-concentration ozone, release interstitial water and cell water, reduce the water content of the sludge, adsorb heavy metals in the sludge by adding silicon-based mesoporous materials, and treat substances in municipal sludge mainly including microorganisms, organic matters and heavy metals.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a process flow chart of a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to a process flow chart of a municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process shown in fig. 1, the municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process comprises the following steps:
step one: carrying out sludge concentration on the primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank (with the effective volume of 40m & lt/EN & gt) comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, conditioning agent and guiding agent are added into the conditioning tank, mixing and stirring time is 10-20 minutes, the conditioning agent is 4-8 parts of humic acid and 3-6 parts of sulfuric acid, and the guiding agent is 5-6 parts of hydrogen peroxide and 2-3 parts of ferric trichloride;
fe in ferric trichloride 3+ The hydrolysis capability is strong, when the pH value is more than 1, ferric iron can generate mononuclear hydroxyl weak ions, the ions and the sludge generate electrostatic neutralization to form flocs, and the flocs formed by ferric chloride are smaller, for example, the sludge is sent into a mechanical dewatering device such as a box type diaphragm to be pressedThe filter cloth is difficult to completely intercept the sludge, the filtrate is turbid, the treatment effect is poor, and the specific gravity of the floccule formed by adopting ferric salt is large, so that the sedimentation performance is good, and a good condition is created for mud-water separation.
The pH value of the sludge is regulated by humic acid and sulfuric acid, and the sludge is regulated to a proper pH value environment, so that the wall breaking treatment of microbial cells in the sludge is facilitated, and the wall breaking and dehydration effects are enhanced; then, the microbial cell in the sludge is subjected to effective wall breaking pretreatment under the synergistic effect of the microbial cell and the hydrogen peroxide with strong oxidability; humic acid has the functions of exchange, adsorption, complexation, chelation and the like with metal ions; the polymer is used as polyelectrolyte in a dispersion system, has the functions of coagulation, peptization, dispersion and the like, and can better promote the decomposition of organic matters in sludge.
Step three: lifting conditioned sludge into vertical sludge wall breaking equipment (the installed capacity is 11.0kw, the total weight of the equipment is about 2 tons, the daily water consumption is 2 tons), adding a breaking aid into the sludge wall breaking equipment, introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 20mg/L-25mg/L, the inlet air flow is 1.8L/min-2L/min, the wall breaking time is 5-8 minutes, and the breaking aid comprises 2-4 parts of metal chelating agent and 3-6 parts of trinitrobenzene sulfonic acid;
the water content of municipal sludge is about 99%, a viscose phase region is formed between microorganism cells in the municipal sludge and the organic colloid, a large amount of interstitial water can be wrapped, and a large amount of cell water is contained in the microorganism cells. The water is difficult to extrude in a mechanical dehydration mode, the metal chelating agent and the trinitrobenzene sulfonic acid are added into the sludge, so that the cell wall and the cell membrane permeability can be increased, the cell wall and the cell membrane are expanded, the volume is enlarged, expansion is formed, then high-concentration ozone is introduced, the ozone acts on the cell wall and the cell membrane, the action area is wider, the effect is better, the components of the ozone are damaged to cause metabolic disorder, the ozone continuously permeates, the membrane is penetrated to destroy the lipoprotein and the lipopolysaccharide in the membrane to cause cell dissolution and death, and interstitial water and cell water are released to form free water which is easy to remove;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 15-30 minutes, wherein the adsorbent is 1-2 parts of silicon-based mesoporous material attached with carbon nanotubes;
the single-wall carbon nano-tube has the advantages of dispersing and presenting a three-dimensional reticular three-dimensional structure, enriching micropores, small pore diameter, narrow pore diameter distribution, special hollow structure, high specific surface area, low resistivity and the like, the silicon-based mesoporous material has larger specific surface area, ordered pore canal and adjustable pore diameter size, and the silicon-based mesoporous material attached with the carbon nano-tube fully combines the excellent performances of the two materials and improves the adsorption performance of the silicon-based mesoporous material on heavy metals in sludge.
Step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 25-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating the sludge.
And in the fourth step, the sludge conditioned in the lower sludge conditioning area can be lifted to the upper sludge conditioning area by a sludge lifting pump, and the second and third steps are repeated to perform double circulation of sludge wall breaking conditioning. And in the fifth step, waste water is subjected to reverse osmosis device to collect waste water concentrated solution, the waste water concentrated solution is conveyed to the upper part of the evaporator, is sprayed to the lower part of the evaporator through a material nozzle to be circularly sprayed and concentrated, waste water clear liquid in the waste water concentrated solution is conveyed to a steam cooling pipe through a pipeline and a check valve by adopting negative pressure evaporation, and the steam cooling pipe is circumferentially arranged on the outer wall of the upper sludge conditioning area. And (3) carrying out circulating concentration on the wastewater concentrated solution, and carrying out evaporation crystallization treatment after the wastewater concentrated solution is formed into a high-concentration concentrated solution. The clear liquid is collected by heating the wastewater concentrated solution, steam can provide heat for an upper sludge conditioning area, the treatment effect of a conditioner and a guiding agent on sludge is improved, and the heat is provided to form the clear liquid of wastewater. In the fifth step, the sludge press filtration is carried out in two steps, wherein the press filtration pressure is controlled to be 15 kg-17 kg in the first step, the time is controlled to be 25-30 minutes, the press filtration pressure is controlled to be 20-25 kg in the second step, and the time is controlled to be 55-60 minutes. The silicon-based mesoporous material with the attached carbon nano-tubes is obtained by pressurizing flowing carbon nano-tube liquid and the silicon-based mesoporous material to 50-200MPA through a high-pressure pump, performing jet collision through a multi-pipeline jet nozzle, and performing cyclic processing after the flowing carbon nano-tube liquid and the silicon-based mesoporous material collide under high pressure.
Example 1:
step one: carrying out sludge concentration on 100 parts of primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, a conditioner and a guiding agent are added into the conditioning tank, the mixing and stirring time is 10 minutes, the conditioner comprises 4 parts of humic acid and 3 parts of sulfuric acid, and the guiding agent comprises 5 parts of hydrogen peroxide and 2 parts of ferric trichloride;
step three: lifting conditioned sludge into vertical sludge wall breaking equipment through a sludge lifting pump, adding a breaking aid into the sludge wall breaking equipment, and introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 25mg/L, the inlet air flow is 2L/min, and the wall breaking time is 8 minutes, and the breaking aid comprises 4 parts of metal chelating agent and 6 parts of trinitrobenzene sulfonic acid;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 30 minutes, wherein the adsorbent is 2 parts of silicon-based mesoporous material attached with carbon nanotubes;
step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 25-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating the sludge.
Example 2:
step one: carrying out sludge concentration on 100 parts of primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, a conditioner and a guiding agent are added into the conditioning tank, the mixing and stirring time is 120 minutes, the conditioner comprises 8 parts of humic acid and 6 parts of sulfuric acid, and the guiding agent comprises 6 parts of hydrogen peroxide and 3 parts of ferric trichloride;
step three: lifting conditioned sludge into vertical sludge wall breaking equipment through a sludge lifting pump, adding a breaking aid into the sludge wall breaking equipment, and introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 20mg/L, the inlet air flow is 1.8L/min, and the wall breaking time is 5 minutes, and the breaking aid comprises 2 parts of metal chelating agent and 3 parts of trinitrobenzene sulfonic acid;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 15 minutes, wherein the adsorbent is 1 part of silicon-based mesoporous material attached with carbon nanotubes;
step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 25-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating the sludge.
Example 3:
step one: carrying out sludge concentration on 100 parts of primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, a conditioner and a guiding agent are added into the conditioning tank, the mixing and stirring time is 15 minutes, the conditioner comprises 6 parts of humic acid and 5 parts of sulfuric acid, and the guiding agent comprises 5.5 parts of hydrogen peroxide and 2.5 parts of ferric trichloride;
step three: lifting conditioned sludge into vertical sludge wall breaking equipment through a sludge lifting pump, adding a breaking aid into the sludge wall breaking equipment, and introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 22mg/L, the inlet air flow is 1.9L/min, and the wall breaking time is 7 minutes, and the breaking aid comprises 3 parts of metal chelating agent and 4 parts of trinitrobenzene sulfonic acid;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 20 minutes, wherein the adsorbent is 2 parts of silicon-based mesoporous material attached with carbon nanotubes;
step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 25-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating the sludge.
Example 4:
compared with example 3, the following steps are added:
and in the fourth step, the sludge conditioned in the lower sludge conditioning area can be lifted to the upper sludge conditioning area by a sludge lifting pump, and the second and third steps are repeated to perform double circulation of sludge wall breaking conditioning.
Comparative example 1:
compared to example 3, the following steps are fewer: 3 parts of metal chelating agent is added into the sludge wall breaking equipment.
Comparative example 2:
compared to example 3, the following steps are fewer: 4 parts of trinitrobenzene sulfonic acid is added into sludge wall breaking equipment.
Recording of key steps and key parameters and determination of final sludge water content were performed for examples 1 to 4 and comparative examples 1 to 2, and an operation record table was formed.
Operation record table
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (3)
1. A municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process is characterized in that: the method comprises the following steps:
step one: carrying out sludge concentration on the primary sedimentation municipal sludge with the water content of 98-99.5% in a sludge concentration tank by adopting a centrifugal concentration method;
step two: the fully-closed sludge conditioning tank comprises an upper sludge conditioning area and a lower sludge conditioning area, concentrated sludge is lifted to the upper sludge conditioning area through a sludge lifting pump, a conditioning agent and a guiding agent are added into the conditioning tank, the mixing and stirring time is 10-20 minutes, the conditioning agent is 4-8 parts of humic acid and 3-6 parts of sulfuric acid, and the guiding agent is 5-6 parts of hydrogen peroxide and 2-3 parts of ferric trichloride;
step three: lifting conditioned sludge into vertical sludge wall breaking equipment through a sludge lifting pump, adding a breaking aid into the sludge wall breaking equipment, and introducing high-concentration ozone from the lower end of the sludge wall breaking equipment, wherein the ozone inlet concentration is 20mg/L-25mg/L, the inlet air flow is 1.8L/min-2L/min, the wall breaking time is 5-8 minutes, and the breaking aid comprises 2-4 parts of metal chelating agent and 3-6 parts of trinitrobenzene sulfonic acid;
step four: conveying the wall-broken sludge to a lower sludge conditioning area, adding an adsorbent into the lower sludge conditioning area, and mixing and stirring for 15-30 minutes, wherein the adsorbent is 1-2 parts of silicon-based mesoporous material attached with carbon nanotubes;
step five: pumping the conditioned sludge into a sludge press filter by a sludge pump for mechanical dehydration to obtain sludge cakes with the water content of 30-35%, collecting wastewater into a wastewater tank, dropping the squeezed sludge cakes from a plate frame machine, conveying the sludge to a sludge crushing device by a screw conveyor, crushing and air-drying the sludge, and then transporting the sludge to landfill or incinerating;
in the fifth step, waste water is subjected to waste water concentrate collection through a reverse osmosis device, the waste water concentrate is conveyed to the upper part of an evaporator, is sprayed to the lower part of the evaporator through a material nozzle and is subjected to circulating spray concentration, waste water clear liquid in the waste water concentrate is conveyed to a steam cooling pipe through a pipeline and a check valve by adopting negative pressure evaporation, and the steam cooling pipe is circumferentially arranged on the outer wall of the upper sludge conditioning area;
the silicon-based mesoporous material with the attached carbon nano-tubes is obtained by pressurizing flowing carbon nano-tube liquid and the silicon-based mesoporous material to 50-200MPA through a high-pressure pump, performing jet collision through a multi-pipeline jet nozzle, and performing cyclic processing after the flowing carbon nano-tube liquid and the silicon-based mesoporous material collide under high pressure.
2. The municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process according to claim 1, which is characterized in that: and in the fourth step, the sludge conditioned in the lower sludge conditioning area can be lifted to the upper sludge conditioning area by a sludge lifting pump, and the second and third steps are repeated to perform double circulation of sludge wall breaking conditioning.
3. The municipal sludge wall-breaking conditioning double-circulation deep dehydration treatment process according to claim 1, which is characterized in that: in the fifth step, the sludge press filtration is carried out in two steps, wherein the press filtration pressure is controlled to be 15 kg-17 kg in the first step, the time is controlled to be 25-30 minutes, the press filtration pressure is controlled to be 20-25 kg in the second step, and the time is controlled to be 55-60 minutes.
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