CN112723696A - Sludge reduction and recycling treatment process system and treatment method - Google Patents
Sludge reduction and recycling treatment process system and treatment method Download PDFInfo
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- CN112723696A CN112723696A CN202011396129.0A CN202011396129A CN112723696A CN 112723696 A CN112723696 A CN 112723696A CN 202011396129 A CN202011396129 A CN 202011396129A CN 112723696 A CN112723696 A CN 112723696A
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- 239000010802 sludge Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000009467 reduction Effects 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 39
- 238000004064 recycling Methods 0.000 title abstract description 16
- 238000009279 wet oxidation reaction Methods 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000011084 recovery Methods 0.000 claims abstract description 52
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 claims abstract description 48
- 229910052567 struvite Inorganic materials 0.000 claims abstract description 48
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 239000002910 solid waste Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 38
- 238000001556 precipitation Methods 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- 238000004821 distillation Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000000813 microbial effect Effects 0.000 claims description 6
- 239000012024 dehydrating agents Substances 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 34
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- 229910052698 phosphorus Inorganic materials 0.000 description 10
- 239000011574 phosphorus Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 235000015097 nutrients Nutrition 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 229910001425 magnesium ion Inorganic materials 0.000 description 4
- 239000012716 precipitator Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 159000000003 magnesium salts Chemical class 0.000 description 3
- 239000002686 phosphate fertilizer Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
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- 229910001385 heavy metal Inorganic materials 0.000 description 2
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- 239000000047 product Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-M dihydrogenphosphate Chemical compound OP(O)([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-M 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- 239000002689 soil Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
- C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
-
- 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
-
- 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
- C02F2303/10—Energy recovery
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge reduction and recycling treatment process system and a treatment method. The treatment process system comprises a mixing treatment part, a wet oxidation part, a heat recovery part, a gas collection device, a solid waste collection device, a liquid treatment part, a concentration part and the like. The sludge reduction and recycling treatment process system provided by the invention treats the sludge through the mixing treatment part, the wet oxidation part and the liquid treatment part, not only can greatly reduce the total amount and volume of the sludge, but also can obtain organic acid and struvite, has low cost and little pollution, and can realize the reduction and recycling of the sludge. In addition, through energy cycle design, can carry out recovery and reuse to the energy, further reduce cost.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a sludge reduction and recycling treatment process system and a treatment method.
Background
The sludge is organic matters, sediment substances such as microbial colonies and the like generated in the sludge treatment process of a sewage plant and residues such as floating foam floating on the surface of sewage, is a secondary product in the sewage treatment process, and has the characteristics of high water content, large volume and the like. The treatment of sludge is always a difficult problem in the field of garbage treatment, and the treatment cost of excess sludge accounts for 25% -60% of the operation cost of sewage treatment plants, so that the realization of sludge reduction treatment and treatment cost reduction are the research focuses at home and abroad at present. In addition, the sludge contains phosphorus and other useful components (such as aluminum, calcium, potassium, sodium and aromatic compounds), and the phosphorus and the other useful components need to be recovered, and if the phosphorus and the other useful components are not properly treated, nutrient elements flow into the natural environment, so that eutrophication pollution is easily caused.
At present, the common sludge treatment and disposal technologies include landfill method, incineration method, biodegradation method and heat drying method, and the technical methods all have different defects. The emergence of sludge sanitary landfill technology is early, and the technology is one of the main means for early sludge treatment. The method has the characteristics of low requirement on the site, low cost, convenient application, simple whole process and operation and also has some problems, pathogenic microorganisms, pathogenic bacteria and heavy metal elements in the sludge easily permeate and pollute soil and underground water so as to cause harm to human health, and untreated sludge is not subjected to stabilization and harmless treatment, is easy to decompose and smell, and causes greater harm to the local ecological environment. The incineration method directly carbonizes the organic matters in the sludge through high-temperature combustion, kills pathogenic microorganisms and pathogenic bacteria in the organic matters, and can achieve the aims of sludge reduction, harmlessness and stabilization. However, since a certain proportion of organic substances exist in the incineration process, toxic gases such as dioxin, sulfur dioxide and the like can be generated, which causes pollution to residents around the local area and the atmospheric environment, and the treatment of the ash after incineration is also a difficult problem. The biodegradation method needs longer treatment time, occupies large area of process equipment, is easy to generate secondary pollution and influences the surrounding environment. The process of sludge treatment by the heat drying method consumes large energy, generates dust pollution and cannot treat heavy metals completely.
Wet oxidation is used as a hydrothermal treatment process, and under the condition of high temperature and high pressure, oxygen is used as an oxidant to oxidize organic pollutants in a sludge/water mixture into low-toxicity or non-toxic substances, so that the reduction treatment of sludge and the release of nutrient elements can be realized at the same time. The wet oxidation treatment of the sludge is short in time consumption and almost free of secondary pollution, and nutrient elements in the sludge solid can be released into a water phase to oxidize organic matters into micromolecular organic acids. However, the high energy consumption and high cost of the wet oxidation method have been important factors that restrict the large-scale application thereof, and for example, patent CN204325095U discloses an apparatus and a method for reducing sludge by the wet oxidation method, but the apparatus and the method also have the problems of high energy consumption and high cost.
Therefore, the development of a low-cost and low-energy-consumption processing device and method has important practical significance and economic value.
Disclosure of Invention
The invention aims to overcome the defects or shortcomings of high energy consumption, high cost, poor treatment effect, easy pollution and the like of the sludge treatment and disposal technology in the prior art, and provides a sludge reduction and recycling treatment process system. The sludge reduction and recycling treatment process system provided by the invention efficiently degrades complex organic matters by utilizing a wet oxidation technology, and simultaneously recovers phosphorus in sludge, thereby greatly reducing the solid amount and volume in activated sludge and realizing sludge reduction; the obtained organic acid can be used as a carbon source in the wastewater treatment process, and the struvite can be used as a phosphate fertilizer, so that resource recovery is realized; in addition, the organic acid and the struvite generate extra income, and the income is used as a cost subsidy for treating the activated sludge, so that the treatment cost can be greatly reduced. Meanwhile, an energy circulation system is arranged in the system, so that the energy can be repeatedly utilized, and the energy consumption is reduced.
The invention also aims to provide a sludge reduction and recycling treatment method.
In order to realize the novel purpose of the use, the invention adopts the following technical scheme:
a sludge reduction and resource treatment process system comprises a mixing treatment component for heating sludge and mixing with a microbial cell dehydrating agent, a wet oxidation component for carrying out wet oxidation reaction on the sludge, a heat recovery component for recovering heat, a gas collection device for collecting gas, a solid waste collection device for collecting solid, a liquid treatment component for carrying out struvite precipitation reaction on liquid and a concentration component;
the mixing processing part is communicated with the wet oxidation part through a conveying structure; the wet oxidation part is respectively communicated with the heat recovery part and the solid waste collection device, the heat recovery part is respectively communicated with the gas collection device and the liquid treatment part, and the liquid treatment part is communicated with the concentration part; the sludge reduction and resource treatment process system also comprises a heat supply component for supplying heat to the conveying structure; the heat recovery part is respectively communicated with the mixing treatment part, the wet oxidation part and the concentration part and is used for providing heat.
The system can realize the reduction and the resource utilization of the sludge, and the specific process is as follows:
(1) dehydrating agent (such as Na) for sludge and microbial cells2CO3Solution) is mixed in the mixing treatment part, thereby promoting the release efficiency of the nutrient elements in the wet oxidation process. The mixture is heated to obtain a homogeneous sludge mixture, and then the homogeneous sludge mixture is conveyed to a wet oxidation part by utilizing a conveying structure, and meanwhile, the homogeneous sludge mixture in the conveying structure is heated by utilizing a heat supply part in the conveying process.
(2) The sludge is subjected to wet oxidation reaction in the mixing treatment part to obtain gas, liquid and residual solid, wherein the gas and the solid are directly recovered, and the liquid contains a large amount of nutrient salts such as phosphorus, ammonia nitrogen and the like, so that the sludge can be further treated and recycled.
The process of the moisture oxidation reaction is as follows:
initiation of the chain:
RH+O2→ R. + HOO. (RH is organic)
2RH+O2→2R·+H2O2
H2O2+ M → 2OH (M is catalyst)
Chain transmission:
RH+·OH→R·+H2O
R·+O2→ROO·
ROO·+RH→ROOH+R·
termination of the chain:
R·+R·→R-R
ROO·+R·→ROOR
ROO·+ROO·+H2O→ROOH+ROH+O2
organic acid is obtained through moisture oxidation reaction and can be used as a carbon source in the wastewater treatment process, so that resource utilization is realized; and meanwhile, certain benefits are brought.
In addition, the amount and volume of sludge are greatly reduced through the moisture oxidation reaction, and the reduction is realized.
(3) The gas is conveyed into the gas collecting device after the heat is collected by the heat recovery part; the liquid is conveyed to the liquid treatment component after the heat is collected by the heat recovery component, and a precipitator (such as a magnesium source: a magnesium salt reagent, brine, seawater and the like) is added for struvite precipitation reaction, wherein the reaction process is as follows:
Mg2++NH4 ++HnPO4 3-n+6H2O→MgNH4PO4·6H2O+nH+
phosphorus in the sludge can be utilized through struvite precipitation reaction to obtain struvite which can be used as a phosphate fertilizer to realize resource recovery; and meanwhile, certain benefits are brought.
(4) And (4) conveying the liquid subjected to struvite precipitation reaction to a concentration part for concentration.
Therefore, the system provided by the invention can realize reduction and recycling of sludge, has good treatment effect and little pollution, generates additional income by using the obtained organic acid and struvite, and can greatly reduce the treatment cost by using the income as a cost subsidy for treating activated sludge.
Preferably, the mixing treatment part comprises a sludge storage mechanism, a heat exchange mechanism and a mixing reaction mechanism which are sequentially communicated.
The sludge storing mechanism, the heat supplying mechanism and the mixing mechanism which are conventional in the art can be respectively used as the sludge storing mechanism, the heat exchanging mechanism and the mixing reaction mechanism in the invention.
More preferably, the sludge storage mechanism is a sludge storage tank, the heat exchange mechanism is a heat exchanger, and the mixing reaction mechanism is a mixing reactor; the mixing reactor is communicated with the wet oxidation part through a conveying mechanism.
Preferably, the wet oxidation part comprises a wet oxidation reactor and a gas supply tank for supplying gas to the wet oxidation reactor.
The air supply tank provides oxygen for the wet oxidation reactor, so that the sludge is subjected to moisture oxidation reaction.
Preferably, the heat supplying component is a steam generator, and the steam generator is communicated with the conveying mechanism.
The steam generator may be configured to steam heat the homogenous sludge mixture by generating steam.
Preferably, the heat recovery means comprises an energy harvesting device and an energy supply unit; the energy supply unit is respectively communicated with the energy collecting device, the mixing treatment part, the wet oxidation part and the concentration part; the energy harvesting device is in communication with the wet oxidation component.
The energy of gas and liquid is collected through the energy collecting device, and then the energy is supplied to parts needing to be heated in the system through the energy supply unit, so that the recycling of the energy is realized, and the sludge treatment cost is reduced.
More preferably, the energy collecting device comprises a liquid heat recovery unit and a gas heat recovery unit, and the liquid heat recovery unit and the gas heat recovery unit are both communicated with the energy supply unit; the gas heat recovery unit is communicated with the gas collecting device; the liquid heat recovery unit is in communication with the liquid treatment component.
Preferably, the liquid treatment component is a struvite precipitation reaction tower; the concentration part comprises a membrane distillation reactor, a concentrated solution tank and a clear water tank; the outlet of the struvite precipitation reaction tower is communicated with a membrane distillation reactor, and the outlet of the membrane distillation reactor is respectively communicated with a concentrated solution tank and a clear water tank.
The liquid after struvite precipitation reaction is further concentrated.
Preferably, the liquid treatment unit further comprises a precipitant tank for supplying a precipitant to the struvite precipitation reactor and a struvite tank for collecting struvite.
The invention also provides a method for treating the sludge by utilizing the sludge reduction and recycling treatment process system.
A sludge reduction and resource treatment method comprises the following steps:
s1: heating and mixing the sludge in the mixing treatment part to obtain a homogeneous sludge mixture; the mass fraction of the sludge in the homogeneous sludge mixture is 5-20%, and the temperature is 220-280 ℃;
s2: the homogeneous sludge mixture is conveyed to a wet oxidation part through a conveying structure to carry out wet oxidation reaction, so that gas, liquid and reduced sludge solids are obtained;
s3: conveying the sludge solid obtained in the step S2 to a solid waste collection device;
the gas and the liquid obtained in the step S2 are respectively conveyed to a gas collecting device and a liquid processing component after passing through a heat recovery component;
s4: carrying out struvite precipitation reaction on the liquid in the liquid treatment component to obtain struvite and supernatant;
s5: the supernatant is conveyed to a concentration part for concentration;
wherein the heat collected by the heat recovery part is supplied to the mixing treatment part, the wet oxidation part, and the concentration part.
The invention improves the release efficiency of phosphorus by heating and mixing treatment; the wet oxidation reaction and the struvite precipitation reaction are used for treating the sludge, so that the amount and the volume of the sludge can be greatly reduced, the organic acid and the struvite can be obtained, the cost is low, the pollution is low, and the reduction and the recycling of the sludge can be realized. In addition, the oxygen oxidation capacity can be greatly enhanced by regulating and controlling the temperature, the sludge can be modified, deodorized, detoxified and subjected to pollution reduction treatment within tens of minutes, the degradation time is greatly shortened, and the sludge reduction treatment can be efficiently and rapidly realized.
In addition, through energy cycle design, energy is recycled, and cost is further reduced.
Preferably, the mass fraction of the sludge in the homogeneous sludge mixture in S1 is 4%, and the temperature is 2 ℃.
Preferably, the wet oxidation reaction is performed in S2 under the conditions of 220-240 ℃ and pH 8.0-9.5 of oxygen
Preferably, the step of S4 further comprises the steps of adding a magnesium source (such as magnesium salt reagent, brine, seawater, etc.) and adjusting the pH to 8.0-9.5.
And carrying out struvite precipitation reaction by using magnesium ions, phosphate ions, hydrogen phosphate ions and dihydrogen phosphate ions under the pH condition of 8.0-9.5.
More preferably, the mass-volume ratio of the magnesium source to the liquid in S4 is 20-100 mg/L.
Compared with the prior art, the invention has the following beneficial effects:
the sludge reduction and recycling treatment process system provided by the invention treats the sludge through the mixing treatment part, the wet oxidation part and the liquid treatment part, not only can greatly reduce the amount and the volume of the sludge, but also can obtain organic acid and struvite, has low cost and little pollution, and can realize the reduction and recycling of the sludge. In addition, through energy cycle design, can carry out recovery and reuse to the energy, further reduce cost.
Drawings
FIG. 1 is a schematic structural diagram of a sludge reduction and recycling treatment process system provided in example 1;
wherein, 1 is a sludge storage tank, 2 is a heat exchanger, 3 is a mixing reactor, 4 is a steam generator, 5 is a gas supply tank, 6 is an energy supply unit, 7 is an energy collecting device, 8 is a gas collecting device, 9 is a struvite precipitation reaction tower, 10 is a membrane distillation reactor, 11 is a clear water tank, 12 is a concentrate tank, 13 is a struvite tank, 14 is a precipitant tank, 15 is a solid waste collecting device, 16 is an energy supply unit, 17 is a liquid heat recovery unit, and 18 is a gas heat recovery unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It will be understood that when an element is referred to as being "on" or "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Example 1
The embodiment provides a sludge reduction and resource treatment process system, which comprises a mixing treatment component for heating sludge and uniformly mixing with a microbial cell dehydrating agent, a wet oxidation component for carrying out wet oxidation reaction on the sludge, a heat recovery component for recovering heat, a gas collection device 8 for collecting gas, a solid waste collection device 15 for collecting solid, a liquid treatment component for carrying out struvite precipitation reaction on liquid and a concentration component, as shown in figure 1;
the mixing processing part is communicated with the wet oxidation part through a conveying structure; the wet oxidation part is respectively communicated with a heat recovery part and a solid waste collection device 15, the heat recovery part is respectively communicated with a gas collection device 8 and a liquid treatment part, and the liquid treatment part is communicated with a concentration part; the sludge reduction and resource treatment process system also comprises a heat supply component for supplying heat to the conveying structure; the heat recovery part is respectively communicated with the mixing treatment part, the wet oxidation part and the concentration part and is used for providing heat.
Specifically, the mixing processing component comprises a sludge storage tank 1, a heat exchanger 2 and a mixing reactor 3 which are communicated in sequence; the wet oxidation part comprises a wet oxidation reactor 6 and a gas supply tank 5 for supplying gas to the wet oxidation reactor 6; the heat supplying part is a steam generator 4; the heat recovery part comprises an energy collection device 7 and an energy supply unit 16, the energy collection device 7 comprises a liquid heat recovery unit 17 and a gas heat recovery unit 18; the liquid treatment component comprises a struvite precipitation reaction tower 9, a precipitator tank 14 for conveying a precipitator for the struvite precipitation reaction tower 9 and a struvite tank 13 for collecting struvite, wherein the precipitator tank 14 is communicated with the left side of the struvite precipitation reaction tower 9, and the struvite tank 13 is communicated with the bottom of the struvite precipitation reaction tower 9; the concentration part comprises a membrane distillation reactor 10, a concentrated solution tank 12 and a clean water tank 11, and the outlet of the membrane distillation reactor 10 is respectively communicated with the concentrated solution tank 12 and the clean water tank 11.
The mixing reactor 3 and the wet oxidation reactor 6 are communicated through a conveying mechanism (such as a conveying pipeline), and the steam generator 4 is communicated with the conveying mechanism; the liquid outlet of the wet oxidation reactor 6, the liquid heat recovery unit 17 and the struvite precipitation reaction tower 9 are communicated in sequence; the gas outlet of the wet oxidation reactor 6, the gas heat recovery unit 18 and the gas collection device 8 are communicated in sequence; the solid outlet of the wet oxidation reactor 6 is communicated with a solid waste collection device 15; the liquid heat recovery unit 17 and the gas heat recovery unit 18 are both communicated with the power supply unit 16, and the power supply unit 16 is respectively communicated with the heat exchanger 2, the wet oxidation reactor 6 and the membrane distillation reactor 10.
The processing procedure of the system is as follows:
(1) heating sludge (the temperature is 20 ℃ and 10L) stored in a sludge storage tank by a heat exchanger, conveying the heated sludge into a mixing reactor, and regulating the temperature of the mixing reactor and the sludge to be 60 ℃ to obtain a homogeneous sludge mixture, wherein the mass fraction of the sludge in the homogeneous sludge mixture is about 10%.
(2) And conveying the homogeneous sludge mixture to a wet oxidation reactor through a conveying pipeline, utilizing a steam generator to generate steam, conveying the steam to the conveying pipeline, and carrying out steam heating treatment on the homogeneous sludge mixture. And introducing nitrogen to exhaust air in the wet oxidation reactor, introducing oxygen, regulating the temperature of the wet oxidation reactor to 240 ℃, and stopping the reaction after the homogeneous sludge mixture undergoes a wet oxidation reaction in the wet oxidation reactor for 90 min. The reaction process is as follows:
initiation of the chain:
RH+O2→ R. + HOO. (RH is organic)
2RH+O2→2R·+H2O2
H2O2+ M → 2OH (M is catalyst)
Chain transmission:
RH+·OH→R·+H2O
R·+O2→ROO·
ROO·+RH→ROOH+R·
termination of the chain:
R·+R·→R-R
ROO·+R·→ROOR
ROO·+ROO·+H2O→ROOH+ROH+O2
according to the reaction, organic acid is obtained after wet oxidation reaction, and can be used as a carbon source in the wastewater treatment process to realize resource utilization; and meanwhile, certain benefits are brought. In addition, the liquid also contains a certain amount of phosphorus (80-120 mg/L).
(3) The gas enters a gas collecting device after absorbing heat through a gas heat recovery unit; the liquid enters a struvite precipitation reaction tower after absorbing heat through a liquid heat recovery unit; and the gas heat recovery unit absorbs the heat and the liquid heat recovery unit absorbs the heat and then transfers the heat to the energy supply unit and is used for supplying heat to the heat exchanger, the wet oxidation reactor and the membrane distillation reactor.
Adding magnesium salt (magnesium chloride) into a struvite precipitation reaction tower by using a precipitant box, introducing oxygen into an air supply tank to empty air in the struvite precipitation reaction tower, regulating and controlling the reaction temperature to be 280 ℃, the pH value to be 8, and the adding amount of a magnesium source to be 40mg/L, wherein the magnesium ion meter is used for carrying out the following reactions:
Mg2++NH4 ++HnPO4 3-n+6H2O→MgNH4PO4·6H2O+nH+
9.5g of struvite can be obtained by utilizing phosphorus in sludge through struvite precipitation reaction and can be used as a phosphate fertilizer to realize resource recovery; and meanwhile, certain benefits are brought.
(4) After struvite precipitation reaction, standing to separate solid and liquid, allowing the product struvite to enter a struvite box, allowing the supernatant to enter a membrane distillation reactor, performing evaporation concentration treatment, allowing the concentrated solution to enter a concentrated solution box, and allowing clear water to enter a clear water box for storage.
Through the operation steps, the sludge volume can be reduced by more than 85%, and the recovery rate of phosphorus in the water phase can be up to more than 92.20%.
It will be appreciated by those of ordinary skill in the art that the examples provided herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited examples and embodiments. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (10)
1. A sludge reduction and resource treatment process system is characterized by comprising a mixing treatment component for heating sludge and uniformly mixing the sludge with a microbial cell dehydrating agent, a wet oxidation component for carrying out wet oxidation reaction on the sludge, a heat recovery component for recovering heat, a gas collection device (8) for collecting gas, a solid waste collection device (15) for collecting solid, a liquid treatment component for carrying out struvite precipitation reaction on liquid and a concentration component;
the mixing processing part is communicated with the wet oxidation part through a conveying structure; the wet oxidation part is respectively communicated with a heat recovery part and a solid waste collection device 15, the heat recovery part is respectively communicated with a gas collection device 8 and a liquid treatment part, and the liquid treatment part is communicated with a concentration part; the sludge reduction and resource treatment process system also comprises a heat supply component for supplying heat to the conveying structure; the heat recovery part is respectively communicated with the mixing treatment part, the wet oxidation part and the concentration part and is used for providing heat.
2. The sludge reduction and resource treatment process system according to claim 1, wherein the mixing treatment component comprises a sludge storage mechanism, a heat exchange mechanism and a mixing reaction mechanism which are sequentially communicated.
3. The sludge reduction and resource treatment process system according to claim 2, wherein the sludge storage mechanism is a sludge storage tank (1), the heat exchange mechanism is a heat exchanger (2), and the mixing reaction mechanism is a mixing reactor (3); the mixing reactor (3) is communicated with the wet oxidation part through a conveying mechanism.
4. A sludge reduction and resource treatment process system according to claim 1, wherein said wet oxidation unit comprises a wet oxidation reactor (6) and a gas supply tank (5) for feeding gas to the wet oxidation reactor (6).
5. A sludge reduction and resource treatment process system according to claim 1, wherein said heat supplying component is a steam generator (4), and said steam generator (4) is in communication with a conveying mechanism.
6. A sludge reduction and resource treatment process system according to claim 1, wherein said heat recovery means comprises an energy collection device (7) and an energy supply unit (16); the energy supply unit (16) is respectively communicated with the energy collecting device (7), the mixing processing part, the wet oxidation part and the concentration part; the energy collecting device (7) is communicated with the wet oxidation part.
7. The sludge reduction and resource treatment process system according to claim 6, wherein the energy collecting device (7) comprises a liquid heat recovery unit (17) and a gas heat recovery unit (18), and the liquid heat recovery unit (17) and the gas heat recovery unit (18) are both communicated with the energy supply unit (16); the gas heat recovery unit (18) is communicated with the gas collecting device (8); the liquid heat recovery unit (17) is in communication with the liquid treatment component.
8. A sludge reduction and resource treatment process system according to claim 1, wherein said liquid treatment unit comprises a struvite precipitation reaction tower (9); the concentration component comprises a membrane distillation reactor (10), a concentrated solution tank (12) and a clear water tank (11); the outlet of the struvite precipitation reaction tower (9) is communicated with a membrane distillation reactor (10), and the outlet of the membrane distillation reactor (10) is respectively communicated with a concentrated solution tank (12) and a clear water tank (11).
9. A process system for sludge reduction and resource treatment according to claim 1, wherein said liquid treatment section further comprises a precipitant tank (14) for feeding a precipitant to the struvite precipitation reaction tower (9) and a struvite tank (13) for collecting struvite.
10. A sludge reduction and resource treatment method is characterized by comprising the following steps:
s1: heating and mixing the sludge and the microbial cell dehydrating agent in the mixing treatment part to obtain a homogeneous sludge mixture; the mass fraction of the sludge in the homogeneous sludge mixture is 5-20%, and the temperature is 220-280 ℃;
s2: the homogeneous sludge mixture is conveyed to a wet oxidation part through a conveying structure to carry out wet oxidation reaction, so that gas, liquid and reduced sludge solids are obtained;
s3: conveying the sludge solid obtained in the step S2 to a solid waste collection device;
the gas and the liquid obtained in the step S2 are respectively conveyed to a gas collecting device and a liquid processing component after passing through a heat recovery component;
s4: carrying out struvite precipitation reaction on the liquid in the liquid treatment component to obtain struvite and supernatant;
s5: the supernatant is conveyed to a concentration part for concentration;
wherein the heat collected by the heat recovery part is supplied to the mixing treatment part, the wet oxidation part, and the concentration part.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114835354A (en) * | 2022-06-30 | 2022-08-02 | 北京博泰至淳生物科技有限公司 | Recycling treatment process for brewing wastewater |
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