CN106630298A - Method for rapidly treating Ag<+>, Cr<6+> and Hg<2+> in industrial acidic waste liquid - Google Patents

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

Ag in a kind of quick process commercial acid waste liquid+、Cr6+、Hg2+Method

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 Hg^{2 +}, 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 salt^2-With the Hg in the waste liquid²⁺Reaction, generates mercuric sulphide (HgS) (Hg²⁺ +S^2-=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⁺+S^2-=2Fe²⁺+ S ↓, Fe²⁺+S^2-=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.