CN106630298A - Method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid - Google Patents
Method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid Download PDFInfo
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- CN106630298A CN106630298A CN201710044436.4A CN201710044436A CN106630298A CN 106630298 A CN106630298 A CN 106630298A CN 201710044436 A CN201710044436 A CN 201710044436A CN 106630298 A CN106630298 A CN 106630298A
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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
- C02F1/52—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
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- 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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Abstract
The invention relates to the field of waste liquid treatment, in particular to a method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid. The method comprises the following steps: adding soluble hydrosulfite or sulfite into the waste liquid, stirring, adjusting the pH value to 7.5-8.0, standing, precipitating, and treating by using a filtering device; sequentially adding soluble sulfate and ferrous sulfate, stirring, standing, precipitating, treating by using the filtering device, and discharging a filtrate; before the filtrate is discharged, adding soluble chlorate into the waste liquid, stirring, standing, precipitating, and treating by using the filtering device. The method has the beneficial effects as follows: by virtue of membrane filtration, tiny suspended particles in a supernatant after precipitation can be effectively removed so as to more effectively remove metal ions in the waste liquid; furthermore, the treatment time of the waste liquid can be shortened, and the treatment efficiency is improved.
Description
Technical field
The present invention relates to field of waste liquid treatment, Ag in more particularly to a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+
Method.
Background technology
Existing liquid waste processing mode is a lot, mainly has redox, active carbon adsorption, pH to adjust method, precipitation neutralisation
Deng.Wherein, redox precipitation fado is applied to containing Cr6+Or the noxious material with reproducibility；Active carbon adsorption is typically made
For the two stage treatment of waste liquid, be used for processing biology, the micro organic matter in dissolved state that physically or chemically method can not be removed,
Heavy metal substance；PH adjusts method makes the pH value for the treatment of fluid reach discharge after 6-8 by adding acid or alkali.
COD (Chemical Oxygen Demand, COD, similarly hereinafter) and ammonia nitrogen analysis are common industry
Acid waste liquid, COD and ammonia nitrogen etc. are wide variety of pollution monitoring indexs in water and tailing water analysis；COD tests are frequently with weight chromium
Sour potassium backflow titration measuring, to make analysis result accurate, accurate in standard method of analysis, need to be with mercury with silver as catalyst
Inhibitor suppresses muriatic interference, but the addition of these chemical agents is in addition to it increased analysis cost, and analysis process is not
When a series of environmental problem is still caused, its harmfulness is its pH low and silver-colored, mercury, chromium concn height, especially mercury can be rapid
Accumulation enters food chain, has very strong bio-toxicity, Ag in COD waste liquids to fish and wildlife+There are about 4g/L, Cr6+About contain
0.8g/L, Hg2+Content is up to 10g/L, and waste liquid is strong acid severe corrosive；Ammonia nitrogen is tested frequently with GB nessler reagent colorimetric
Method, also contains a large amount of Hg in its waste liquid2+；So above-mentioned acid waste liquid is poured into before lower water must deal carefully with, effectively remove
Ag therein+、Cr6+And Hg2+。
For removal Ag+、Cr6+And Hg2+Etc. heavy metal ion when, frequently with " precipitation-neutralization-co-precipitation " mode, for
The process of mercurous waste liquid, generally adds Na2S is sufficiently stirred for generating the HgS of indissoluble；For the process of chrome waste liquid, generally first to molten
Add iron filings, FeSO in liquid4Deng reducing agent, by supervirulent Cr6+It is reduced to the less Cr of toxicity3+, then adjust solution ph left to 7
The right side, makes Cr3+Form Cr (OH)3Precipitate, then standing separation；Can add in solution containing Cl for silver-containing waste water-Reagent, shape
Into AgCl precipitations.For supernatant can adopt the further adsorption filtration of activated carbon after standing.But formed in the method precipitation process
Precipitation particle it is less, staticly settle effect often not ideal enough so that later separation effect is poor, Ag+、Cr6+And Hg2+Deng a huge sum of money
Category ion remaval effect is undesirable.
The content of the invention
It is an object of the invention to provide Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, using film
Filtering function not only can effectively remove the fine particle suspended in supernatant after precipitating, such that it is able to more effectively removal
Metal ion in waste liquid；The process time of waste liquid can also be shortened, treatment effeciency, cost-effective solution prior art is improved
Present in problem.
Concrete technical scheme of the present invention is as follows：
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Solvable bisulfites or sulphite are added in the waste liquid, by Cr6+It is reduced to the less Cr of toxicity3+, stir
After mixing, pH value is adjusted to 7.5～8.0, staticly settled, filter described in Jing is processed, remove Cr3+；
Solvable sulphurizing salt and ferrous sulfate are sequentially added, is staticly settled after stirring, the solvable sulphurizing salt and Hg2+Reaction,
HgS precipitations are generated, the ferrous sulfate generates FeS precipitations, filter described in Jing with unnecessary described solvable sulfuration reactant salt
Process, remove Hg2+, by filtrate discharge；
Before filtrate discharge, solvable chlorate is added in waste liquid, staticly settled after stirring, the solvable chlorate and Ag+Reaction, Jing filters device and processes, and removes Ag+。
Further, the solvable bisulfites is the aqueous solution or solid, addition with molar ratio computing, the solvable Asia
Disulfate is Cr in the commercial acid waste liquid6+1.5～2.5 times.
Further, the solvable sulphite is the aqueous solution or solid, addition with molar ratio computing, the solvable sulfurous
Sour hydrogen salt is Cr in the commercial acid waste liquid6+1.5～2.5 times.
Further, the solvable sulphurizing salt is the aqueous solution or solid, addition with molar ratio computing, the solvable sulphurizing salt
For Hg in the commercial acid waste liquid2+0.25～0.35 times.
Further, the ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is institute to addition
State Hg in commercial acid waste liquid2+0.4～0.6 times.
Further, the solvable chlorate is the aqueous solution or solid, addition with molar ratio computing, the solvable chlorate
For Ag in the commercial acid waste liquid+2～4 times.
Further, the filter includes pulsating pump and filter core；The pulsating pump and the filter core phase
Even, the pulsating pump is used to draw waste liquid, and the filter core is used for filtering precipitate.
Further, the filter core adopts low desalination NF membrane, supermicro filtration membrane filter core, PP filter cores, Wire-wound filter core, titanium
One or more in rod filter core or stainless steel filter core.
Further, the filter core precision is 0.001～100 μm.
The present invention compared with prior art, has the advantages that：
The present invention establishes Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, with reference to the filtration
Device, using the efficient interception capacity of film, not only can effectively remove the precipitation particle for suspending small in solution, it is ensured that Ag+、Cr6+、
Hg2+Deng the removal effect of heavy metal, and time of repose can be shortened, it is poor to solve the problems, such as to staticly settle effect, accelerate waste liquid
Treatment effeciency so that its follow-up separating effect is more preferably；And processing cost is cheap, sewage drainage standard can be reached.
Contain a certain amount of acidic materials in commercial acid waste liquid of the present invention, using this condition, make Cr6+Reduce
Reaction, is reduced to the less Cr of toxicity3+And precipitation is generated, by precipitation and membrane filtration group technology, effectively remove above-mentioned precipitation.
Then not only efficiently reduced due under acid condition, removing Hg by adjusting pH value again2+When, because of introducing sulfide
Reagent and the hydrogen sulfide gas that produce, cause to pollute the problem of environment；And pH value is closely related with the solubility of mercury ion, works as pH
For 7.5～8.0 when, Hg2+Solubility it is minimum, reach optimal removal effect.Whole technological process is rationally quick, green ring
Protect.
Ferrous sulfate easily forms Fe (OH) in water in the present invention2With Fe (OH)3Colloid, these colloids can not only adsorb Hg2 +, and can trap and wrap up in and help HgS, FeS co-precipitation of suspension to get off, play good coagulating sedimentation effect.
Description of the drawings
Fig. 1 is the section of structure of filter of the present invention；
Specific embodiment
The specific embodiment of the present invention is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
In describing the invention, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that
Indicate or imply relative importance；For the ordinary skill in the art, can understand that above-mentioned term exists with concrete condition
Concrete meaning in the present invention.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Solvable bisulfites or sulphite are added in the waste liquid, after stirring, pH value are adjusted to 7.5～8.0,
Staticly settle, filter described in Jing is processed, remove Cr3+；
It is of the present invention, HSO in solvable bisulfites3 -With Cr in the waste liquid2O7 2-Reaction, by Cr6+It is reduced to poison
The less Cr of property3+(2Cr2O7 2-+6HSO3 -+10H+=4Cr3++6SO4 2-+8H2O)；
It is of the present invention, SO in solvable sulphite3 2-With Cr in the waste liquid2O7 2-Reaction, by Cr6+It is reduced to toxicity
Less Cr3+(Cr2O7 2-+3SO3 2-+8H+=2Cr3++3SO4 2-+4H2O)
It is subsequently adding NaOH (NaOH), potassium hydroxide (KOH), sodium carbonate (Na2CO3), potassium carbonate (KCO3), carbonic acid
Hydrogen sodium (NaHCO3) etc. alkaline matter, pH value is adjusted to 7.5～8.0；It is heretofore described, due to NaOH thermal discharges compared with
Greatly, so the present invention is being first added thereto to Na2CO3、NaHCO3, add afterwards as a example by NaOH and illustrate；
When pH is 7.5～8.0, Cr3+Meeting and OH-Generate Cr (OH)3Green coloured viscous are precipitated, by the filter,
Precipitation retention is removed；
The solvable bisulfites can adopt potassium bisulfite (KHSO3), calcium bisulfite [Ca (HSO3)2], sulfurous acid
Hydrogen sodium (NaHSO3) etc. any one or a few in soluble bisulfite；
The solvable sulphite can adopt potassium sulfite (K2SO3), calcium bisulfite (CaSO3), sodium hydrogensulfite
(Na2SO3) etc. any one or a few in soluble sulphite；
The solvable bisulfites is the aqueous solution or solid, addition with molar ratio computing, the solvable bisulfites
For 1.5～2.5 times of the commercial acid chromium from waste chromium ion；
The solvable sulphite is the aqueous solution or solid, and with molar ratio computing, the solvable bisulfites is addition
1.5～2.5 times of the commercial acid chromium from waste chromium ion.
Solvable sulphurizing salt and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, removed
Hg2+, by filtrate discharge；
It is of the present invention, S in solvable sulphurizing salt2-With the Hg in the waste liquid2+Reaction, generates mercuric sulphide (HgS) (Hg2+
+S2-=HgS ↓), the solubility extremely low (2.943 × 10 of HgS-20Mg/L, 20 DEG C), being capable of Precipitation；But HgS can be dissolved in excess
In sulfuration salting liquid, solvable sulfuration mercury complex [(HgS is formed2)2-], it is therefore necessary to the amount for controlling solvable sulphurizing salt can not mistake
It is many；Heretofore described, add ferrous sulfate, ferrous sulfate that Fe (OH) is easily formed in water2With Fe (OH)3Colloid, these glue
Body can not only adsorb mercury ion, and can trap and wrap up in and help the HgS co-precipitations of suspension to get off, and generate FeS precipitation [Fe3++3OH-
=Fe (OH)3↓, 2Fe3++S2-=2Fe2++ S ↓, Fe2++S2-=FeS ↓], by the filter, the retention of above-mentioned precipitation is gone
Remove；
The solvable sulphurizing salt can adopt vulcanized sodium (Na2S), potassium sulfide (K2Any one in soluble sulphurizing salt such as S)
Or it is several；
The solvable sulphurizing salt is the aqueous solution or solid, and with molar ratio computing, the solvable sulphurizing salt is the work to addition
0.25～0.35 times of mercury ion in industry acid waste liquid；
The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is the industrial acids to addition
0.4～0.6 times of mercury ion in property waste liquid.
Before filtrate discharge, solvable chlorate is added in waste liquid, staticly settled after stirring, Jing filters device and processes, and removes
Remove Ag+；
It is of the present invention, Cl in solvable chlorate-With Ag in the waste liquid+Reaction, generates silver chlorate (AgCl) (Ag++
Cl-=AgCl ↓), the solubility relatively low (1.93mg/L, 20 DEG C) of AgCl, can Precipitation, by the filter, will
Precipitation retention is removed；
The solvable chlorate can adopt sodium chloride (NaCl), potassium chloride (KCl), calcium chloride (CaCl2), magnesium chloride
(MgCl2) etc. any one or a few in soluble chlorine salt dissolving；
The solvable chlorate is the aqueous solution or solid, and with molar ratio computing, the solvable chlorate is the work to addition
2～4 times of silver ion in industry acid waste liquid.
As shown in figure 1, a kind of heretofore described, filter, including pulsating pump and filter core；The suction
Water pump is used to draw waste liquid；
The pulsating pump can adopt Domestic water purifying pump, suction pump or booster pump；The present invention is illustrated by taking suction pump as an example
Explanation；
The filter core using low desalination NF membrane, supermicro filtration membrane filter core, PP filter cores, Wire-wound filter core, titanium rod filter core or
Stainless steel filter core；
The filter core precision is 0.001～100 μm.
It is of the present invention preferred, using supermicro filtration membrane filter core；The supermicro filtration membrane filter core precision is 0.002 μm.
Ag in quick process commercial acid waste liquid of the present invention+、Cr6+、Hg2+Method, single work not only can be processed
Heavy metal ion in industry acid waste liquid, can also process mixed waste liquor or other contain Ag+、Cr6+、Hg2+Etc. heavy metal ion
Solution；It is of the present invention, to process COD waste liquids and COD, ammonia nitrogen mixed waste liquor as a example by be illustrated.
Embodiment 1
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Sodium chloride is added in COD waste liquids, is staticly settled after stirring, Jing filters device and processes；The sodium chloride is water-soluble
Liquid or solid, with molar ratio computing, the sodium chloride is Ag in the COD waste liquids to addition+2 times.
Sodium hydrogensulfite is subsequently adding, after stirring, Na is added thereto to2CO3、NaHCO3, NaOH is added afterwards, by pH
Value is adjusted to 7.5～8.0, is staticly settled, and filter described in Jing is processed；The sodium hydrogensulfite is the aqueous solution or solid, is added
With molar ratio computing, the sodium hydrogensulfite is Cr in the COD waste liquids to dosage6+1.5 times.
Vulcanized sodium and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, directly discharged；
The vulcanized sodium is the aqueous solution or solid, and with molar ratio computing, the vulcanized sodium is Hg in the COD waste liquids to addition2+0.25
Times；The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the COD waste liquids to addition2+
0.4 times.
As shown in figure 1, described in the present embodiment, filter includes pulsating pump 1 and filter core 2；The pulsating pump with
The filter core is connected；Filter described in the present embodiment also includes water inlet pipe 3, outlet pipe 4, waste liquid cylinder 5 and Filter Liquor Cylinders 6；
The pulsating pump draws the waste liquid 7 containing sediment by the water inlet pipe from the waste liquid cylinder, and the filter core is used for
Filtering precipitate, the Filter Liquor Cylinders are used to hold the filtrate 8 that filter core described in Jing is filtered；When using, the filtrate is placed in
Multiple times of filtration process is carried out in the waste liquid cylinder.
Embodiment 2
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Potassium bisulfite is added in COD waste liquids, after stirring, Na is added thereto to2CO3、NaHCO3, add afterwards
NaOH, pH value is adjusted to 7.5～8.0, is staticly settled, and filter described in Jing is processed；The potassium bisulfite is the aqueous solution
Or solid, with molar ratio computing, the potassium bisulfite is Cr in the COD waste liquids to addition6+2.5 times.
Potassium chloride is added, is staticly settled after stirring, Jing filters device and processes；The potassium chloride is the aqueous solution or solid, is added
With molar ratio computing, the potassium chloride is Ag in the COD waste liquids to dosage+2 times.
Vulcanized sodium and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, directly discharged；
The vulcanized sodium is the aqueous solution or solid, and with molar ratio computing, the vulcanized sodium is Hg in the COD waste liquids to addition2+0.3
Times；The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the COD waste liquids to addition2+
0.45 times.
Embodiment 3
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Add calcium bisulfite, after stirring, be added thereto to Na in COD waste liquids2CO3、NaHCO3, add afterwards
NaOH, pH value is adjusted to 7.5～8.0, is staticly settled, and filter described in Jing is processed；The calcium bisulfite is the aqueous solution
Or solid, with molar ratio computing, the calcium bisulfite is Cr in the COD waste liquids to addition6+2 times.
Potassium sulfide and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed；The vulcanized sodium
For the aqueous solution or solid, with molar ratio computing, the potassium sulfide is Hg in the COD waste liquids to addition2+0.35 times；The sulfuric acid
Ferrous iron is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the COD waste liquids to addition2+0.5 times.
Magnesium chloride is added in COD waste liquids, is staticly settled after stirring, Jing filters device and processes, directly discharged；The chlorination
Magnesium is the aqueous solution or solid, and with molar ratio computing, the magnesium chloride is Ag in the COD waste liquids to addition+3 times.
Embodiment 4
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Sodium chloride is added in COD waste liquids, is staticly settled after stirring, Jing filters device and processes；The sodium chloride is water-soluble
Liquid or solid, with molar ratio computing, the sodium chloride is Ag in the COD waste liquids to addition+4 times.
Potassium sulfite is subsequently adding, after stirring, Na is added thereto to2CO3、NaHCO3, NaOH is added afterwards, by pH value
Adjust to 7.5～8.0, staticly settle, filter described in Jing is processed；The potassium bisulfite is the aqueous solution or solid, is added
With molar ratio computing, the potassium bisulfite is Cr in the COD waste liquids to amount6+2 times.
Potassium sulfide and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, directly discharged；
The potassium sulfide is the aqueous solution or solid, and with molar ratio computing, the potassium sulfide is Hg in the COD waste liquids to addition2+0.3
Times；The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the COD waste liquids to addition2+
0.6 times.
Embodiment 5
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Sodium chloride is added in COD, ammonia nitrogen mixed waste liquor, is staticly settled after stirring, Jing filters device and processes；The chlorination
Sodium is the aqueous solution or solid, and with molar ratio computing, the sodium chloride is Ag in the ammonia nitrogen waste liquid to addition+2.5 times.
Calcium bisulfite is subsequently adding, after stirring, Na is added thereto to2CO3、NaHCO3, NaOH is added afterwards, by pH
Value is adjusted to 7.5～8.0, is staticly settled, and filter described in Jing is processed；The calcium bisulfite is the aqueous solution or solid, is added
With molar ratio computing, the calcium bisulfite is Cr in the ammonia nitrogen waste liquid to dosage6+1.8 times.
Vulcanized sodium and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, directly discharged；
The vulcanized sodium is the aqueous solution or solid, and with molar ratio computing, the vulcanized sodium is Hg in the ammonia nitrogen waste liquid to addition2+0.32
Times；The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is in the ammonia nitrogen waste liquid to addition
Hg2+0.53 times.
Embodiment 6
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Sodium sulfite is added in COD, ammonia nitrogen mixed waste liquor, after stirring, Na is added thereto to2CO3、NaHCO3, Zhi Houzai
NaOH is added, pH value is adjusted to 7.5～8.0, staticly settled, filter described in Jing is processed；The calcium bisulfite is water
Solution or solid, with molar ratio computing, the calcium bisulfite is Cr in the ammonia nitrogen waste liquid to addition6+2.3 times.
Potassium chloride is subsequently adding, is staticly settled after stirring, Jing filters device and processes；The potassium chloride is the aqueous solution or solid
Body, with molar ratio computing, the potassium chloride is Ag in the ammonia nitrogen waste liquid to addition+3.6 times.
Vulcanized sodium and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed, directly discharged；
The vulcanized sodium is the aqueous solution or solid, and with molar ratio computing, the vulcanized sodium is Hg in the ammonia nitrogen waste liquid to addition2+0.27
Times；The ferrous sulfate is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is in the ammonia nitrogen waste liquid to addition
Hg2+0.44 times.
Embodiment 7
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Sodium hydrogensulfite is added in COD, ammonia nitrogen mixed waste liquor, after stirring, Na is added thereto to2CO3、NaHCO3, afterwards
NaOH is added, pH value is adjusted to 7.5～8.0, staticly settled, filter described in Jing is processed；The sodium hydrogensulfite is
The aqueous solution or solid, with molar ratio computing, the sodium hydrogensulfite is Cr in the ammonia nitrogen waste liquid to addition6+2.3 times.
Potassium sulfide and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed；The potassium sulfide
For the aqueous solution or solid, with molar ratio computing, the potassium sulfide is Hg in the ammonia nitrogen waste liquid to addition2+0.3 times；The sulfuric acid
Ferrous iron is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the ammonia nitrogen waste liquid to addition2+0.5 times.
Magnesium chloride is subsequently adding, is staticly settled after stirring, Jing filters device and processes, directly discharged；The magnesium chloride is water
Solution or solid, with molar ratio computing, the magnesium chloride is Ag in the ammonia nitrogen waste liquid to addition+3.6 times.
Embodiment 8
The present embodiment is improved on the basis of embodiment 1, and the content described in embodiment 1 is also the present embodiment institute
Have, no longer specifically repeat herein.
Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method, comprise the following steps：
Potassium sulfite is added in COD, ammonia nitrogen mixed waste liquor, after stirring, Na is added thereto to2CO3、NaHCO3, Zhi Houzai
NaOH is added, pH value is adjusted to 7.5～8.0, staticly settled, filter described in Jing is processed；The sodium hydrogensulfite is water
Solution or solid, with molar ratio computing, the sodium hydrogensulfite is Cr in the ammonia nitrogen waste liquid to addition6+1.5 times.
Vulcanized sodium and ferrous sulfate are sequentially added, is staticly settled after stirring, filter described in Jing is processed；The vulcanized sodium
For the aqueous solution or solid, with molar ratio computing, the vulcanized sodium is Hg in the ammonia nitrogen waste liquid to addition20.35 times；The sulphur
Sour ferrous iron is the aqueous solution or solid, and with molar ratio computing, the ferrous sulfate is Hg in the ammonia nitrogen waste liquid to addition20.58
Times.
Sodium chloride is added in waste liquid, is staticly settled after stirring, Jing filters device and processes, directly discharged；The sodium chloride
For the aqueous solution or solid, with molar ratio computing, the sodium chloride is Ag in the ammonia nitrogen waste liquid to addition+4 times.
According to above-described embodiment 1-8 steps, COD waste liquids, ammonia nitrogen waste liquid are tested, obtain test result such as following table institute
Show：
Upper table result shows, Ag in quick process commercial acid waste liquid of the present invention+、Cr6+、Hg2+Method, make
The concentration of each polluter is significantly reduced in COD waste liquids, COD, ammonia nitrogen mixed waste liquor, disclosure satisfy that comprehensive discharge three-level mark
It is accurate；And effectively reach drinking water standard limit.
Finally it should be noted that：Various embodiments above only to illustrate technical scheme, rather than a limitation；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, either which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, do not make the essence disengaging various embodiments of the present invention technology of appropriate technical solution
The scope of scheme.
Claims (9)
1. it is a kind of quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that comprise the following steps：
Solvable bisulfites or sulphite are added in the waste liquid, by Cr6+It is reduced to the less Cr of toxicity3+, after stirring,
PH value is adjusted to 7.5～8.0, is staticly settled, filter described in Jing is processed, remove Cr3+；
Solvable sulphurizing salt and ferrous sulfate are sequentially added, is staticly settled after stirring, the solvable sulphurizing salt and Hg2+Reaction, generates
HgS is precipitated, and the ferrous sulfate generates FeS precipitations with unnecessary described solvable sulfuration reactant salt, and filter described in Jing is processed,
Remove Hg2+, by filtrate discharge；
Before filtrate discharge, solvable chlorate is added in waste liquid, staticly settled after stirring, the solvable chlorate and Ag+Instead
Should, Jing filters device and processes, and removes Ag+。
2. it is as claimed in claim 1 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
It is the aqueous solution or solid to state solvable bisulfites, and with molar ratio computing, the solvable bisulfites is the industry to addition
Cr in acid waste liquid6+1.5～2.5 times.
3. it is as claimed in claim 2 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
It is the aqueous solution or solid to state solvable sulphite, and with molar ratio computing, the solvable bisulfites is the industrial acids to addition
Cr in property waste liquid6+1.5～2.5 times.
4. it is as claimed in claim 3 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
It is the aqueous solution or solid to state solvable sulphurizing salt, and with molar ratio computing, the solvable sulphurizing salt is the commercial acid waste liquid to addition
Middle Hg2+0.25～0.35 times.
5. it is as claimed in claim 4 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
It is the aqueous solution or solid to state ferrous sulfate, and with molar ratio computing, the ferrous sulfate is Hg in the commercial acid waste liquid to addition2+
0.4～0.6 times.
6. it is as claimed in claim 5 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
It is the aqueous solution or solid to state solvable chlorate, and with molar ratio computing, the solvable chlorate is the commercial acid waste liquid to addition
Middle Ag+2～4 times.
7. it is as claimed in claim 6 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
Filter is stated including pulsating pump and filter core；The pulsating pump is connected with the filter core, and the pulsating pump is used to inhale
Waste liquid is taken, the filter core is used for filtering precipitate.
8. it is as claimed in claim 7 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
Filter core is stated using low desalination NF membrane, supermicro filtration membrane filter core, PP filter cores, Wire-wound filter core, titanium rod filter core or stainless steel filter core
In one or more.
9. it is as claimed in claim 8 quickly to process Ag in commercial acid waste liquid+、Cr6+、Hg2+Method, it is characterised in that institute
Filter core precision is stated for 0.001～100 μm.
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| CN107840461A (en) * | 2017-10-31 | 2018-03-27 | 东莞理工学院 | A kind of wastewater from chemical industry efficient green inorganic agent and preparation method thereof |
| CN112225351A (en) * | 2020-10-14 | 2021-01-15 | 江苏强盛功能化学股份有限公司 | Method for treating brine of chloride brine secondary refrigerant |
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Application publication date: 20170510 |