CN109264916A - A kind of flying dust leaching liquid processing method and its system - Google Patents
A kind of flying dust leaching liquid processing method and its system Download PDFInfo
- Publication number
- CN109264916A CN109264916A CN201811080041.0A CN201811080041A CN109264916A CN 109264916 A CN109264916 A CN 109264916A CN 201811080041 A CN201811080041 A CN 201811080041A CN 109264916 A CN109264916 A CN 109264916A
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- Prior art keywords
- flying dust
- pond
- order reaction
- tank
- reverse osmosis
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- 239000007788 liquid Substances 0.000 title claims abstract description 72
- 238000002386 leaching Methods 0.000 title claims abstract description 71
- 239000000428 dust Substances 0.000 title claims abstract description 63
- 238000003672 processing method Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 43
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 33
- 238000001704 evaporation Methods 0.000 claims abstract description 32
- 230000008020 evaporation Effects 0.000 claims abstract description 32
- 239000013522 chelant Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 24
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000006228 supernatant Substances 0.000 claims abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 7
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 26
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- 238000001556 precipitation Methods 0.000 claims description 19
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 17
- 238000000108 ultra-filtration Methods 0.000 claims description 14
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- 239000011734 sodium Substances 0.000 claims description 13
- 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 claims description 12
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 11
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- OOZZOPQSMSSQDF-UHFFFAOYSA-N [Na].[Na].[Na].N1=CN=CN=C1.S1SSC=C1 Chemical compound [Na].[Na].[Na].N1=CN=CN=C1.S1SSC=C1 OOZZOPQSMSSQDF-UHFFFAOYSA-N 0.000 claims description 7
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
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- 206010067482 No adverse event Diseases 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
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- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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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
- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- 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
- C02F2001/007—Processes including a sedimentation step
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- 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
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- C02F2103/06—Contaminated groundwater or leachate
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention discloses a kind of flying dust leaching liquid processing method and its system, it include: adjusting leaching liquor pH8~11 in first order reaction pond, subsequently into reaction tanks at different levels, it is separately added into heavy metal chelant and flocculant, it is staticly settled after generating alumina blossom particles, pH3~5 are adjusted again, Fenton reagent is added, it staticly settles rear supernatant and is passed through in clarifier-tank and purify, pass through film process unit again, reverse osmosis produced water and reverse osmosis concentrated liquid are obtained after processing, producing water water quality is good, recoverable, reverse osmosis concentrated liquid is using evaporation element evaporative crystallization, recycle salts substances, Nacl can be produced.Treated that liquid may be recovered utilization by the present invention, wastewater zero discharge can be achieved, crystal salt can also be produced, it is environmental protection, safe and efficient processing method, pollution problem of the flying dust leaching liquor for helping to solve to generate after waste incineration to environment, its system operatio is easy, and equipment requirement is simple, and system operating is reliable.
Description
Technical field
The present invention relates to sewage environmental protection treatment technical field, it is related specifically to a kind of flying dust leaching liquid processing method and its is
System.
Background technique
Today's society, as the productivity of the mankind greatly improves, the expansion of urban population and its consuming capacity consume energy
Power is continuously improved, and the amount of generated production and living rubbish is increasing in city, and the mode of process for producing house refuse is main
Garbage disposal is carried out by directly filling or by burning.Rubbish, which directly fills, can occupy excessive land resource, and rubbish is burnt
The bulkiness that can have both reduced rubbish is burnt, can also be generated electricity using the heat for generation of burning away the refuse, is more efficient now
Common trash processing way.It burns at present and has become one of main processing mode of domestic waste.It is produced after waste incineration
Raw flying dust amount is generally the 1-5% of original rubbish gross mass, if along in gas cleaning processing and Refuse Incineration Process
The pharmaceutical quantities such as the calcium hydroxide of addition, flying dust total amount then account for the 3-7% of former quantity of refuse.Heavy metal and salt content are high in flying dust, often
It is filled after carrying out chelation treatment using chelating agent.
The landfill of flying dust is open work, and rainwater, snow etc. flow through flying dust heap body surface face during landfill, i.e. the leaching of generation flying dust
Solution.Untreated flying dust leaching liquor contains heavy metal and inorganic salts of high level etc., if penetrating into soil without processing
In, it will the pollution of unrepairable is caused to soil, can also pollute natural water.The leaching liquor of heavy metals exceeding standard not only will affect
The growth of crops can also influence indirectly people's health by food chain.Therefore, carry out incineration of refuse flyash leaching liquor
Innoxious process for treating has extremely important realistic meaning.
Currently, being all mostly in the prior art about the processing method or equipment to flying dust, about flying dust leaching liquor
Treatment research it is very few, there is no engineering application example, also very it is rare arrive relevant document report.The present invention is to current technology
Deficiency provides the processing method and system of a kind of incineration of refuse flyash leaching liquor.
Summary of the invention
The present invention provides the processing method and its system of a kind of incineration of refuse flyash leaching liquor, it is therefore an objective to provide a kind of economy
Flying dust leaching liquid processing method and system feasible, processing is efficient, environmentally friendly helps to solve pollution of the flying dust leaching liquor to environment
Problem.
The invention is realized by the following technical scheme:
A kind of flying dust leaching liquid processing method, comprising the following steps:
(1) flying dust leaching liquor is passed through in first order reaction pond, acid solution is added and adjusts its pH value to 8~11；PH value is adjusted by adding
HCl is added to realize, in order to which subsequent metal chelatropic reaction provides suitable acid or alkali environment；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, flying dust leaching liquor total weight 0.05~0.2% is added
Heavy metal chelant, be slowly stirred 20~30min, carry out metal-chelating reaction, its is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5~10min, makes metal chelating
Object precipitating convert is closed as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 2~3h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 3~5, adds appropriate
Fenton reagent, stir evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 1~2h, keep its precipitating complete；
(7) by the supernatant in second-level settling pond by strainer, flow into clarifier-tank, adjust pH to 8.8~9.2, go deliming, magnesium,
Iron plasma after being purified, adjusts pH to 6.5~7.5；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, retains a certain amount of COD and total
Nitrogen, obtains the reverse osmosis produced water of reverse osmosis concentrated liquid and processing qualification, and reverse osmosis produced water may be recovered or discharge.
Ultrafiltration membrane is that a kind of aperture specification is consistent, and nominal pore range is 0.01 micron of micropore filtering film below, in film
Side impose appropriate pressure, sift out the solute molecule less than aperture, be greater than with separating molecular weight greater than 500 dalton, partial size
10 nanometers of particle can retain macromolecular substances between 0.002~0.1 micron and protein and bacterium, colloid, iron
Rust, suspended matter, silt, larger molecular organics etc. can be retained down by ultrafiltration membrane, to realize purification process.
Nanofiltration membrane: aperture is to allow solvent molecule or certain low molecular weight solutes or low in 1nm or more, general 1~2nm
A kind of functional semi-permeable membrane that valence ion penetrates.Nanofiltration retaining molecular weight is between reverse osmosis membrane and ultrafiltration membrane, about
200~2000, the ability of retention dissolubility salt is to be lower than high price yin to the desalination of monovalent anion salting liquid between 20~98%
Ion salt solution is generally used for the organic matter in removal surface water and hardness and radium in pigment, underground water, and partially removes molten
Solve salt.
Reverse osmosis membrane is artificial semi-permeable membrane with certain characteristics made of a kind of simulation biological semi-permeable film, is reverse osmosis skill
The core component of art.The membrane aperture of reverse osmosis membrane is very small, and the diameter of surface micropore is generally between 0.5~10nm, therefore energy
Dissolved salts, colloid, microorganism, the organic matter etc. in water removal are enough removed, all dissolution salts of energy effectively catching and molecular weight are greater than
100 organic matter, while hydrone being allowed to pass through.
The present invention uses the film process unit that is composed of ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, have good treatment of water quality,
Consume energy low, simple process, it is easy to operate the advantages that, treatment process without phase-change, has no adverse effects to constituent in material, and
Separation purifies, is in normal temperature state in concentration process always.
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid
It is recycled, can be used as industrial colling or afforestation uses, realize zero-emission；Strong brine is crystallized, and sodium chloride is obtained
Crude salt can be sold directly as Nacl, or refined salt sale is obtained after purification.
In the step (2), heavy metal chelant is prepared from the following raw materials in parts by weight: tri-thiol s-triazine trisodium salt
30~50 parts, 5~10 parts of vulcanized sodium, 5~15 parts of sodium carbonate, 10~20 parts of anionic polyacrylamide, potassium dihydrogen phosphate 10~
20 parts.
Flocculant described in step (3) is composed of PAC and PAM, and wherein the additional amount of PAC is 80~120ppm,
The additional amount of PAM is 1~5ppm.
In the step (5), the Fenton reagent is combined by hydrogen peroxide and ferrous sulfate according to weight ratio 10:2~3
It forms, the mass fraction of the hydrogen peroxide is 0.2~0.8%.
A kind of flying dust leaching liquid treating system, including first order reaction pond, second order reaction pond, third-order reaction pond, level-one precipitating
Pond, fourth-order reaction pond, second-level settling pond, clarifier-tank and evaporation element are connected between each pond by the pipeline with water pump；Its
In, between first stage precipitation tank and fourth-order reaction pond, filter device, second order reaction are respectively set between second-level settling pond and clarifier-tank
Charging device and mixing plant, the circulation line of charging device and pond is respectively set in pond, third-order reaction pond and fourth-order reaction pond
It is connected, film process unit is set between clarifier-tank and evaporation element, film process unit includes ultrafiltration membrane, nanofiltration membrane and reverse osmosis
Film, evaporation element include evaporator and heater, and evaporation element is also connect with power generator.
Several regions are arranged according to water flowing direction in the clarifier-tank, and active carbon interlayer, active carbon interlayer is arranged between region
It is provided with active carbon particle, for purifying water.
The mixing plant is the position for being set to pond middle and lower part, can carry out rotation stirring around axis, mixing plant has
Waveform paddle, mixing plant can set whether open and adjust mixing speed according to specific needs.
In the second order reaction pond, third-order reaction pond and fourth-order reaction pond, circulation line is respectively set, in pond body middle and lower part
Connection pool circumference tangentially goes out water-circulating pipe, and setting water pump draws water on circulation pipe, and circulation pipe water inlet is arranged above pond body,
It is connected with charging device, system can be according to the use for specifically needing situation to decide whether unlatching circulation pipe；When liquid circulation
The effect that the stirring that is vortexed can be formd in pond promotes in each reaction tank reaction to accelerate and thoroughly, and saves the reaction time；It follows
Strainer is arranged in endless tube water outlet periphery, enters circulation pipe to prevent the deposit in pond, influences circulation pipe normal operation.
The charging device includes several solvent tanks, and each solvent tank parallel connection passes through the circulation of the piping connection circulatory system
Line entry, is arranged water pump and flow control valve on pipeline, charging device can be used for launching heavy metal chelant, flocculant and
Fenton reagent etc., is first dissolved in solvent tank when feeding intake, and then passes through flow control valve, by suitable material and circulation
Circulating liquid in pipe is put into together in corresponding pond.
The flow control valve is accompanied with flow sensor, and for measuring the fluid flow passed through, flow sensor can
To carry out automatically controlling closing flow control valve according to the dosage set, accurate quantification addition can be played the role of.
The evaporation element is equipped with multi-effect evaporator, by several evaporator series, adds secondary steam as next effect
Hot steam.The heater provides origin of heat for evaporation element, and evaporator is the place of solution evaporation.
The power generator is that mixing plant and whole system are powered.
Applicant it has been investigated that, flying dust leaching liquor mainly has following characteristics: a) strong alkaline water, pH value be 12~13；B)
High salt, TDS reach 37000~50000mg/L；C) contain organic matter, in total nitrogen mainly based on organic nitrogen, organic matter after solidification
Increase；D) contain calcium, sulfate, hardness number is higher.The suitable environmental pH of microorganism is generally between 6~9, when pH is greater than 9
Afterwards, the metabolic rate of microorganism will can be disintegrated by strong influence, zoogloea, can also generate sludge bulking phenomenon；Generally
Biochemical system is 20000 mg/L to the permission upper limit of salinity, and the salt tolerant of the salinity in leaching liquor considerably beyond microorganism bears energy
Power.Therefore, biological treatment is not suitable for flying dust leaching liquor.
Fenton reagent of the present invention, also known as Fenton reagent refer to the tool being made of hydrogen peroxide and ferrous ion
There is the system of strong oxidizing property.Fenton reagent has very strong oxidisability, and its oxidisability adapts to various useless without selectivity
The processing of water.Fenton method has unique advantage, H when handling persistent organic pollutants2O2In Fe2+Catalytic action under
It decomposes and generates OH, oxidizing potential reaches 2.8V, and oxidation operation is resolved into small molecule by approach such as electronics transfers by it.
Meanwhile Fe2+It is oxidized to Fe3+Coagulating sedimentation is generated, large amount of organic is removed.Fenton reagent oxidisability is strong, in reaction process
Can be thoroughly innoxious by pollutant, and oxidant H2O2Residue after participating in reaction can be decomposed voluntarily, not stayed residual
It is remaining, while being also good flocculant, effect is good.The main function for the Fenton reagent that the present invention is added is to reduce flying dust leaching
COD and organic molecule in liquid.
Heavy metal chelant is usually also designated as heavy metal ion releasing agent, heavy metal chelating agent etc..Heavy metal chelant
Heavy metal ion is chelated by a variety of chelation groups, hydrophobic structure is generated and forms precipitating, then removed by flocculant
It goes, to achieve the purpose that removing heavy metals.
Tri-thiol s-triazine trisodium salt (abbreviation TMT), molecular formula Na3C3N3S3.It is the divalent in chelating precipitation water body
Agent for capturing is often used with monovalent heavy metal ion, can chelate to form extremely difficult molten object with various heavy such as mercury, cadmium, lead, chromium plasma
Matter, and the water chelate with very good chemical stability.The aqueous solution that TMT common commercial form is 15%, is commonly called as
TMT-15.TMT will not be to environmental danger, still will not be to fish when in every cubic metre of waste water containing up to 12000mL
Deng existence cause adverse effect, therefore, TMT is a kind of environmentally friendly organic sulfur medicament.TMT is formed with heavy metal ion
Precipitate particles it is smaller, the effects of being caught by PAC and PAM adsorption bridging and net, can make precipitate particles be condensed into compared with
Big flocky precipitate is conducive to the separation removal of sediment.
Vulcanized sodium is also known as smelly alkali, smelly soda, yellow alkali, akali sulphide.Vulcanized sodium is inorganic compound, and pure vulcanized sodium is colourless knot
Crystalline flour end, moisture absorption is strong, soluble easily in water.Vulcanized sodium is in the treatment of waste water derived from the mechanism of action of heavy metal, the sulphur after hydrolysis
Ion and metal ion have very strong binding ability, and are formed by metal sulfide solubility product constant compared with metal hydroxides
It is much smaller with complex compound.The present invention adds going for the alkali solubility heavy metal that suitable vulcanized sodium can help in flying dust leaching liquor
It removes.
Sodium carbonate, molecular formula Na2CO3, it is the powder or particle of white odorless under room temperature, there is water imbibition.Carbonate
Ion can generate difficulty soluble salt precipitating, such as copper carbonate, zinc carbonate, manganese carbonate with heavy metal ion most in water, use carbon
Sour sodium goes removing heavy metals to have the advantages that economically cheap, easy, quick, environmentally friendly, harm to the human body is few.
Anionic polyacrylamide (APAM) is water-soluble high molecular polymer, is mainly used for various industrial wastewaters
Flocculating setting precipitates clarifying treatment, such as steel plant wastewater, waste water from plating plant, Metallurgical Waste Water, the sewage treatments such as coal washing waste water, dirt
Mud dehydration etc., it may also be used for drinking water clarification and purified treatment.Due to containing a certain number of polar groups in its strand, it
It can make to build bridge between particle or so that particle coacervation is formed big flocculation by charging neutrality by the solids that suspend in absorption water
Object, therefore the sedimentation of particle in suspension can be accelerated, have and obviously accelerate solution clarification, promotes filtering and other effects.The present invention
Heavy metal chelant in anionic polyacrylamide is added the ability of heavy metal chelant bind metal ion can be enhanced, have
Particle is precipitated conducive to the quick metallo-chelate that generates.
Potassium dihydrogen phosphate, chemical formula KH2PO4, it is stable in the air, it is dissolved in water, does not dissolve in ethyl alcohol.It is added in the present invention
Potassium dihydrogen phosphate can combine with heavy metal ion as solution stabilizer and adjuvant, help speed up heavy metal precipitation
Formation.
PAC, the English abbreviation of aluminium polychloride, the entitled Polyaluminium Chloride of foreign language, also referred to as alkali formula chlorination
Aluminium is between AlCl3With Al (OH)3 Between a kind of water-soluble inorganic high molecular polymer, chemical general formula be [Al2(OH)
nCl6-N] m, wherein m represents extent of polymerization, is commonly used for water purification agent or coagulant.Aluminium polychloride has a wide range of application, and adapts to aqueous
Extensively, big alumen ustum is easily quickly formed, sedimentation function is good, when water temperature is low, can still keep stable sedimentation effect.
PAM is the abbreviation of Polyacrylamide, and Chinese is polyacrylamide, is common non-ionic high score
Sub- flocculant, molecular weight 150-2000 ten thousand.Polyacrylamide amine molecule can build bridge with the suspended particles being scattered in solution and adsorb,
There is extremely strong flocculation.PAC and PAM is used cooperatively in the processing of flying dust leaching liquor of the present invention, makes its flocculating effect more preferably.
The medicine have the advantages that
1, the processing method of flying dust leaching liquor of the present invention may be implemented after evaporation process to salt in leaching liquor
Point recycling realize wastewater zero discharge by system treated liquid may be recovered utilizations, be environmental protection, safe
Processing method.The leaching liquor that processing method of the present invention helps to solve to generate after incineration of refuse flyash landfill asks the pollution of environment
Topic, the processing for the flying dust leaching liquor in China provide good solution.
2, heavy metal chelant used in the present invention tests the formula obtained after study, by organic sequestering agent with it is inorganic
Chelating agent combines, and sequestering power is strong, and heavy metal removing rate is high, and cost of material is lower, and at a wider pH range in can send out
Good effect is waved, with the Cu in waste water2+、Cd2+、Hg2+、Pb2+、Mn2+、Ni2+、Zn2+、Cr3+It is carried out etc. various heavy metal ion
Chemical reaction, and the flocculent deposit for being quickly generated insoluble, low water content in a short time, being easy filtering removal, to reach
The effect of heavy-metal ion removal, makes waste water reach discharge standard.
3, processing system pollutants removal rate of the invention is high, and dispensing preparation is accurately reliable, can prevent flying dust leaching liquor pair
Environment causes secondary pollution, easy to operate, high degree of automation, and operating is reliable, and processing efficiently, can also realize the money of crystal salt
Sourceization utilizes.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is system structure connection schematic diagram of the invention；
Figure label explanation:
1, first order reaction pond；2, water pump；3, second order reaction pond；4, charging device；5, mixing plant；6, circulation line；7, three-level
Reaction tank；8, flow control valve；9, strainer；10, first stage precipitation tank；11, filter device；12, fourth-order reaction pond；13, second level is heavy
Shallow lake pond；14, active carbon interlayer；15, clarifier-tank；16, film process unit；17, ultrafiltration membrane；18, nanofiltration membrane；19, reverse osmosis membrane；
20, evaporation element；21, generating equipment.
Specific embodiment
A kind of flying dust leaching liquid treating system, including first order reaction pond 1, second order reaction pond 3, third-order reaction pond 7, level-one are heavy
Shallow lake pond 10, fourth-order reaction pond 12, second-level settling pond 13, clarifier-tank 15 and evaporation element 20, by with water pump 2 between each pond
Pipeline is connected；Wherein, it is set respectively between first stage precipitation tank 1 and fourth-order reaction pond 12, between second-level settling pond 3 and clarifier-tank 15
Filter device 11 is set, charging device 4 and mixing plant is respectively set in second order reaction pond 3, third-order reaction pond 7 and fourth-order reaction pond 12
5, charging device 4 is connected with the circulation line 6 in pond, and film process unit 16 is arranged between clarifier-tank 15 and evaporation element 20,
Film process unit 16 includes ultrafiltration membrane 17, nanofiltration membrane 18 and reverse osmosis membrane 19, and evaporation element 20 includes evaporator and heater, is steamed
Bill member 20 is also connect with power generator 21.
Several regions are arranged according to water flowing direction in the clarifier-tank 15, and active carbon interlayer 14, active carbon is arranged between region
Interlayer is provided with active carbon particle, for purifying water.
The mixing plant 5 is the position for being set to pond middle and lower part, can carry out rotation stirring around axis, mixing plant has
Waveform paddle, mixing plant can set whether open and adjust mixing speed according to specific needs.
In the second order reaction pond 3, third-order reaction pond 7 and fourth-order reaction pond 12, circulation line 6 is respectively set, in pond body
Middle and lower part connection pool circumference tangentially goes out water-circulating pipe, and setting water pump draws water on circulation pipe, and circulation pipe water inlet is arranged in pond
Above body, it is connected with charging device, strainer 9 is arranged in circulation pipe water outlet periphery.
The charging device 4 includes several solvent tanks, and each solvent tank parallel connection is followed by the piping connection circulatory system
Water pump and flow control valve are arranged on pipeline for 6 entrance of endless tube road.
The evaporation element 20 is equipped with multi-effect evaporator, by several evaporator series, using secondary steam as next effect
Heat steam.The heater provides origin of heat for evaporation element, and evaporator is the place of solution evaporation.
The power generator 21 is that mixing plant and whole system are powered.
The flow control valve 8 is accompanied with flow sensor, and for measuring the fluid flow passed through, flow sensor can
To carry out automatically controlling closing flow control valve according to the dosage set, accurate quantification addition can be played the role of.
According to above-mentioned processing system, the place of following example 1~4 is carried out to the flying dust leaching liquor of two kinds of different quality situations
Reason:
Embodiment 1
A kind of flying dust leaching liquid processing method, comprising the following steps:
(1) flying dust leaching liquor is passed through in first order reaction pond, hydrochloric acid is added and adjusts its pH value to 10；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, a huge sum of money for flying dust leaching liquor total weight 0.08% is added
Belong to chelating agent, be slowly stirred 20min, carry out metal-chelating reaction, it is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5min, makes metallo-chelate
Convert is precipitated as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 2h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 3.5, adds suitable
Fenton reagent stirs evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 1h, keep its precipitating complete；
(7) supernatant in second-level settling pond is flowed into clarifier-tank by strainer, adjusts pH to 8.8, after being purified, adjust pH
To 6.5；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, obtains reverse osmosis concentrated liquid and place
Qualified reverse osmosis produced water is managed, reverse osmosis produced water may be recovered or discharge；
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid carries out
Recycling, strong brine are crystallized, and sodium chloride crude salt is obtained.
In the step (2), heavy metal chelant is prepared from the following raw materials in parts by weight: tri-thiol s-triazine trisodium salt
50 parts, 6 parts of vulcanized sodium, 15 parts of sodium carbonate, 12 parts of anionic polyacrylamide, 15 parts of potassium dihydrogen phosphate.
Flocculant described in step (3) is composed of PAC and PAM, and wherein the additional amount of PAC is 85ppm, PAM's
Additional amount is 2ppm.
In the step (5), the Fenton reagent combined by hydrogen peroxide and ferrous sulfate according to weight ratio 10:2 and
At the mass fraction of the hydrogen peroxide is 0.3%.
Embodiment 2
A kind of flying dust leaching liquid processing method, comprising the following steps:
(1) flying dust leaching liquor is passed through in first order reaction pond, hydrochloric acid is added and adjusts its pH value to 10.5；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, a huge sum of money for flying dust leaching liquor total weight 0.10% is added
Belong to chelating agent, be slowly stirred 25min, carry out metal-chelating reaction, it is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5min, makes metallo-chelate
Convert is precipitated as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 2.5h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 4, adds suitable
Fenton reagent stirs evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 1.5h, keep its precipitating complete；
(7) supernatant in second-level settling pond is flowed into clarifier-tank by strainer, adjusts pH to 9.0, after being purified, adjust pH
To 7.0；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, obtains reverse osmosis concentrated liquid and place
Qualified reverse osmosis produced water is managed, reverse osmosis produced water may be recovered or discharge；
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid carries out
Recycling, strong brine are crystallized, and sodium chloride crude salt is obtained.
In the step (2), heavy metal chelant is prepared from the following raw materials in parts by weight: tri-thiol s-triazine trisodium salt
40 parts, 8 parts of vulcanized sodium, 13 parts of sodium carbonate, 15 parts of anionic polyacrylamide, 20 parts of potassium dihydrogen phosphate.
Flocculant described in step (3) is composed of PAC and PAM, and wherein the additional amount of PAC is 100ppm, PAM's
Additional amount is 2.5ppm.
In the step (5), the Fenton reagent combined by hydrogen peroxide and ferrous sulfate according to weight ratio 10:2 and
At the mass fraction of the hydrogen peroxide is 0.4%.
Embodiment 3
A kind of flying dust leaching liquid processing method, comprising the following steps:
(1) flying dust leaching liquor is passed through in first order reaction pond, hydrochloric acid is added and adjusts its pH value to 8；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, a huge sum of money for flying dust leaching liquor total weight 0.12% is added
Belong to chelating agent, be slowly stirred 20~30min, carry out metal-chelating reaction, it is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5min, makes metallo-chelate
Convert is precipitated as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 2h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 4, adds suitable
Fenton reagent stirs evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 2h, keep its precipitating complete；
(7) supernatant in second-level settling pond is flowed into clarifier-tank by strainer, adjusts pH to 9.2, after being purified, adjust pH
To 7.5；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, obtains reverse osmosis concentrated liquid and place
Qualified reverse osmosis produced water is managed, reverse osmosis produced water may be recovered or discharge；
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid carries out
Recycling, strong brine are crystallized, and sodium chloride crude salt is obtained.
In the step (2), heavy metal chelant is prepared from the following raw materials in parts by weight: tri-thiol s-triazine trisodium salt
45 parts, 5 parts of vulcanized sodium, 10 parts of sodium carbonate, 20 parts of anionic polyacrylamide, 16 parts of potassium dihydrogen phosphate.
Flocculant described in step (3) is composed of PAC and PAM, and wherein the additional amount of PAC is 100ppm, PAM's
Additional amount is 3ppm.
In the step (5), the Fenton reagent is combined by hydrogen peroxide and ferrous sulfate according to weight ratio 10:2.5
It forms, the mass fraction of the hydrogen peroxide is 0.5%.
Embodiment 4
A kind of flying dust leaching liquid processing method, comprising the following steps:
(1) flying dust leaching liquor is passed through in first order reaction pond, hydrochloric acid is added and adjusts its pH value to 11；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, a huge sum of money for flying dust leaching liquor total weight 0.05% is added
Belong to chelating agent, be slowly stirred 20min, carry out metal-chelating reaction, it is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5min, makes metallo-chelate
Convert is precipitated as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 3h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 3, adds suitable
Fenton reagent stirs evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 1h, keep its precipitating complete；
(7) supernatant in second-level settling pond is flowed into clarifier-tank by strainer, adjusts pH to 9.0, after being purified, adjust pH
To 6.8；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, obtains reverse osmosis concentrated liquid and place
Qualified reverse osmosis produced water is managed, reverse osmosis produced water may be recovered or discharge；
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid carries out
Recycling, strong brine are crystallized, and sodium chloride crude salt is obtained.
In the step (2), heavy metal chelant is prepared from the following raw materials in parts by weight: tri-thiol s-triazine trisodium salt
30 parts, 5 parts of vulcanized sodium, 8 parts of sodium carbonate, 10 parts of anionic polyacrylamide, 10 parts of potassium dihydrogen phosphate.
Flocculant described in step (3) is composed of PAC and PAM, and wherein the additional amount of PAC is 110ppm, PAM's
Additional amount is 2ppm.
In the step (5), the Fenton reagent combined by hydrogen peroxide and ferrous sulfate according to weight ratio 10:3 and
At the mass fraction of the hydrogen peroxide is 0.4%.
The flying dust leaching liquor different to two parts of pollutant loads carries out in the way of above-mentioned four kinds of Examples 1 to 4 respectively
The water for the qualified film process permeate that processing, the water quality parameter of flying dust leaching liquor before handling, and processing to step (8) obtain
Matter parameter, as shown in the following table 1, table 2:
Table 1
Note: ND expression is not detected.
Table 2
Note: ND expression is not detected.
It is above-mentioned as it can be seen that can reach discharge standard, each gold by the qualified reverse osmosis produced water that processing to step (8) obtains
The content of category is lower or is not detected, and illustrates that this system is good to the copper in flying dust leaching liquor, zinc, the removal effect of lead；Place
Chemical requirement is low after reason, and total nitrogen content is low, directly externally can discharge or be recycled.
Claims (10)
1. a kind of flying dust leaching liquid processing method, it is characterised in that: the following steps are included:
(1) flying dust leaching liquor is passed through in first order reaction pond, acid solution is added and adjusts its pH value to 8~11；
(2) it adjusts pH value and flying dust leaching liquor is led into second order reaction pond later, flying dust leaching liquor total weight 0.05~0.2% is added
Heavy metal chelant, be slowly stirred 20~30min, carry out metal-chelating reaction, its is made to generate metallo-chelate precipitating particle；
(3) leaching liquor in step (2) is led into third-order reaction pond, flocculant is added, is slowly stirred 5~10min, makes metal chelating
Object precipitating convert is closed as alumina blossom particles precipitating；
(4) mixing liquid in step (3) is led into first stage precipitation tank, carries out staticly settling 2~3h, keep its precipitating complete；
(5) supernatant in first stage precipitation tank is led into fourth-order reaction pond by strainer, adjusts pH value to 3~5, adds appropriate
Fenton reagent, stir evenly；
(6) mixing liquid obtained in step (5) is led into second-level settling pond, stands 1~2h, keep its precipitating complete；
(7) supernatant in second-level settling pond is flowed into clarifier-tank by strainer, adjusts pH to 8.8~9.2, after being purified,
Adjust pH to 6.5~7.5；
(8) liquid is flowed through into the film process unit including ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, obtains reverse osmosis concentrated liquid and place
Qualified reverse osmosis produced water is managed, reverse osmosis produced water may be recovered or discharge；
(9) reverse osmosis concentrated liquid is led into evaporation element, carries out heating evaporation, generate condensate liquid and strong brine, condensate liquid carries out
Recycling, strong brine are crystallized, and sodium chloride crude salt is obtained.
2. flying dust leaching liquid processing method according to claim 1, it is characterised in that: in the step (2), heavy metal chela
Mixture is prepared from the following raw materials in parts by weight: 30~50 parts of tri-thiol s-triazine trisodium salt, and 5~10 parts of vulcanized sodium, sodium carbonate 5
~15 parts, 10~20 parts of anionic polyacrylamide, 10~20 parts of potassium dihydrogen phosphate.
3. flying dust leaching liquid processing method according to claim 1, it is characterised in that: flocculant described in step (3)
It is composed of PAC and PAM, wherein the additional amount of PAC is 80~120ppm, and the additional amount of PAM is 1~5ppm.
4. flying dust leaching liquid processing method according to claim 1, it is characterised in that: described in the step (5)
Fenton reagent is composed of hydrogen peroxide and ferrous sulfate according to weight ratio 10:2~3, and the mass fraction of the hydrogen peroxide is
0.2~0.8%.
5. a kind of flying dust leaching liquid treating system, it is characterised in that: including first order reaction pond (1), second order reaction pond (3), three-level
Reaction tank (7), first stage precipitation tank (10), fourth-order reaction pond (12), second-level settling pond (13), clarifier-tank (15) and evaporation element
(20), it is connected between each pond by the pipeline with water pump (2)；Wherein, first stage precipitation tank (1) and fourth-order reaction pond (12) it
Between, be respectively set filter device (11) between second-level settling pond (3) and clarifier-tank (15), second order reaction pond (3), third-order reaction pond
(7) and charging device (4) and mixing plant (5), the circulation pipe of charging device (4) and pond is respectively set in fourth-order reaction pond (12)
Road (6) is connected, and film process unit (16) are arranged between clarifier-tank (15) and evaporation element (20), and film process unit (16) includes
Ultrafiltration membrane (17), nanofiltration membrane (18) and reverse osmosis membrane (19), evaporation element (20) include evaporator (18) and heater (19), are steamed
Bill member (20) is also connect with power generator (21).
6. flying dust leaching liquid treating system according to claim 5, it is characterised in that: the clarifier-tank (15) is according to water flowing
Several regions are arranged in direction, and active carbon interlayer (14) are arranged between region.
7. flying dust leaching liquid treating system according to claim 5, it is characterised in that: the mixing plant (5) is setting
In the position of pond middle and lower part, rotation stirring can be carried out around axis, mixing plant has waveform paddle.
8. flying dust leaching liquid treating system according to claim 5, it is characterised in that: the second order reaction pond (3), three-level
In reaction tank (7) and fourth-order reaction pond (12), circulation line (6) are respectively set, connection pool circumference tangentially goes out in pond body middle and lower part
Water-circulating pipe, setting water pump draws water on circulation pipe, and circulation pipe water inlet is arranged above pond body, is connected with charging device,
Strainer (9) are arranged in circulation pipe water outlet periphery.
9. flying dust leaching liquid treating system according to claim 5, it is characterised in that: the charging device (4) is if include
Dry solvent tank, each solvent tank parallel connection pass through circulation line (6) entrance of the piping connection circulatory system, water pump are arranged on pipeline
And flow control valve；The flow control valve is accompanied with flow sensor, for measuring the fluid flow passed through.
10. flying dust leaching liquid treating system according to claim 5, it is characterised in that: the evaporation element (20) is equipped with
Multi-effect evaporator heats steam for secondary steam as next effect by several evaporator series.
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| CN112960842A (en) * | 2021-02-08 | 2021-06-15 | 四川环科美能环保科技有限公司 | Treatment method of hazardous waste incineration wastewater |
| CN113843255A (en) * | 2021-09-13 | 2021-12-28 | 生态环境部华南环境科学研究所 | Sectional type stabilization treatment method and system for household garbage incineration fly ash |
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| CN109824183A (en) * | 2019-02-28 | 2019-05-31 | 苏州希图环保科技有限公司 | A kind of high concentrated organic waste liquid zero-emission efficient treatment process with high salt |
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| CN113843255A (en) * | 2021-09-13 | 2021-12-28 | 生态环境部华南环境科学研究所 | Sectional type stabilization treatment method and system for household garbage incineration fly ash |
| CN113843255B (en) * | 2021-09-13 | 2023-10-27 | 生态环境部华南环境科学研究所 | Sectional type stabilization treatment method and system for household garbage incineration fly ash |
| CN115106373A (en) * | 2022-06-14 | 2022-09-27 | 光大环境科技（中国）有限公司 | Treatment process of secondary fly ash in plasma melting of household garbage incineration fly ash |
| CN115106373B (en) * | 2022-06-14 | 2023-05-02 | 光大环境科技（中国）有限公司 | Disposal process for secondary fly ash in plasma melting of household garbage incineration fly ash |
| CN115477415A (en) * | 2022-09-23 | 2022-12-16 | 深圳能源环保股份有限公司 | Method for cooperatively treating phosphorus-containing wastewater by using waste incineration fly ash |
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