CN107879501A - A kind of method of the recovery containing sodium hypochlorite waste water - Google Patents
A kind of method of the recovery containing sodium hypochlorite waste water Download PDFInfo
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- CN107879501A CN107879501A CN201710899988.3A CN201710899988A CN107879501A CN 107879501 A CN107879501 A CN 107879501A CN 201710899988 A CN201710899988 A CN 201710899988A CN 107879501 A CN107879501 A CN 107879501A
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- waste water
- flocculant
- sodium hypochlorite
- liquor natrii
- natrii hypochloritis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
-
- 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
Abstract
The present invention relates to a kind of method of the recovery containing sodium hypochlorite waste water, wherein, it the described method comprises the following steps：1) waste water is subjected to blast gasification, gaseous state waste water carries out preliminary oxidation reaction, then cooling treatment under catalyst action；2) waste water after the cooling period, it is added dropwise and adds liquor natrii hypochloritis's progress oxidation reaction；3) in waste water after oxidation, add flocculant and carry out precipitation process, clear liquid reuse.Present invention additionally comprises the system for realizing the above method, the system include be connected in series stripper, cooling tower, integrated reacting pond, sedimentation basin, reuse tank；Wherein, the stripper is provided with air blower, and catalyst addition entrance；The integrated reacting pond is provided with the addition entrance of liquor natrii hypochloritis；The sedimentation basin is provided with the addition entrance of flocculant.Present invention process flow is simple, and water process and waste water recycling expense are low, and the recycling of water resource can be achieved.
Description
Technical field
The present invention relates to a kind of useless sodium hypochlorite waste water processing and reuse technology, more particularly to acetylene from calcium carbide production time chlorine
Waste water recycling method caused by peace and quiet system in sour sodium cleaning technique.
Background technology
Using in the peace and quiet acetylene production process of sodium hypochlorite, sodium hypochlorite waste water reuse is always the problem in industry, i.e.,
Make still have 20m after the compounding recycling of secondary sodium3Arranged outside/h sodium hypochlorite waste waters, it is impossible to really realize sewage zero-discharge.And
And the presence containing elements such as element, phosphorus, sulphur such as substantial amounts of phosphorus, sulphur in the waste water can cause in caused acetylene gas containing higher
The PH of concentration3、H2S, therefore sodium hypochlorite waste water is unable to direct reuse.Certain PROCESS FOR TREATMENT and control device need to be taken, will
The element such as sulphur, phosphorus complete oxidation can reach a salt index request reuse to primary brine system to sulfate radical or phosphate radical.
In production technology using calcium carbide legal system acetylene, cause due to existing in calcium carbide containing elements such as substantial amounts of phosphorus, sulphur
PH containing higher concentration in caused acetylene gas3、H2S, absorbed and aoxidize by sodium hypochlorite during peace and quiet, but due to oxidation
The amount and oxidization time of agent are limited, and the element such as sulphur, phosphorus can not be fully oxidized to sulfate radical or phosphate radical, cause to contain in waste water
Substantial amounts of reducing substances, which exists, produces higher COD, particularly P elements, and it is completely non-to produce a large amount of unreacteds in waste water
The phosphate radical of positive phosphorus form, according to phosphate radical chemical property, in addition to the metallic salt material of orthophosphoric acid root, the microcosmic salt of other valence states
Class material is dissolved in water, causes the total phosphorus concentration of waste water high, it is difficult to be removed again in subsequent treatment process, influences effluent quality.
The content of the invention
Based on background above technology, it is an object of the invention to provide the method for a kind of " chemical oxidation+coagulation " processing time
Sodium chlorate waste water；Using oxidant applying oxidized waste water, the P elements of other valence states in waste water are made to be completely converted into orthophosphates,
Removed again by coagulation-settlement process, the COD of water outlet can be reduced simultaneously again.
It the described method comprises the following steps：
1) waste water is subjected to blast gasification, gaseous state waste water carries out preliminary oxidation reaction, then cooled down under catalyst action
Processing；
2) in waste water after the cooling period, liquor natrii hypochloritis is added dropwise and carries out oxidation reaction；
3) in waste water after oxidation, after adding flocculant progress precipitation process, clear liquid reuse.
The waste water is sufficiently mixed by after blast gasification with the oxygen in catalyst, air, make sulphion in waste water and
Greatly with oxygen redox reaction occurs for low price phosphorus, carries out preliminary oxidation.
By the waste water of preliminary oxidation again by the Strong oxdiative of liquor natrii hypochloritis, make reducing substances in waste water whole
It is oxidized, the phosphorus of other valence states is completely converted into orthophosphates；
In coagulating kinetics, water is insoluble in using the metallic salt of orthophosphoric acid root；Under the flocculation of flocculant,
Effectively remove indissoluble material, macromolecular class colloidal substance and suspended material in waste water etc.；By the waste water of coagulating sedimentation by giving up
Secondary sodium pump is delivered to salt dissolving process reuse, realizes acetylene system wastewater zero discharge, avoids discharge of wastewater shadow to caused by environment
Ring.
Wherein, catalyst described in step 1) is MnSO4, the catalyst addition quality is the waste water total amount
0.10 ‰~0.15 ‰, preferably 0.12 ‰；The catalyst is the MnSO of mass concentration 15%4Solution.
The temperature of the cooling is 35~45 DEG C；The redox of the follow-up liquor natrii hypochloritis of the proper temperature and waste water is anti-
Should.
Wherein, in step 2), first the pH value of the waste water is adjusted to 3~5, is adjusted using acidic ph modifier；
Used acid is not limited to, present invention preferably employs hydrochloric acid.
In waste water after adjusting pH value, add hypochlorite oxidation agent and carry out secondary oxidation, make reducing substances in waste water
All oxidations, the phosphorus of other valence states are completely converted into orthophosphates, after the completion of oxidation reaction, then the pH of waste water adjusted to 5~
8, provide advantage for coagulating sedimentation.
The concentration of the liquor natrii hypochloritis is 8%~12%, preferably 10%；The addition matter of the liquor natrii hypochloritis
Measure as the 8%~12% of the waste water total amount, preferably 10%.
Wherein, in step 3), the waste water adds flocculant, after being sufficiently stirred, by the indissoluble material in waste water, macromolecular
The flocculation sediment such as class colloidal substance and suspended material, clear liquid discharge.
One or more of the flocculant described in step 3) in calcium chloride, PAC, PAM or iron chloride；
Wherein PAC is aluminium chloride, PAM is polyacrylamide；
Preferably PAM and iron chloride combination flocculant, the mass ratio of PAM and iron chloride is 2 in the combination flocculant
~3:1；When the mass ratio of PAM and iron chloride is 2.15:When 1, flocculating effect is optimal；
The mass concentration of the PAM is 0.1%, and the chlorination iron speciation is 38%；
It is highly preferred that the addition quality of the flocculant is the 0.3% of the waste water total amount；Wherein, described in step 1)
The addition of flocculant is controlled by DCS control systems described in catalyst, liquor natrii hypochloritis described in step 2) and step 3).
Wherein, total phosphorus is 1500~3000ml/L in the waste water.
It is a further object of the present invention to provide a kind of system for realizing the above method, the system includes being connected in series
Stripper, cooling tower, integrated reacting pond, sedimentation basin, reuse tank；
Wherein, the stripper is provided with air blower, and catalyst addition entrance；The integrated reacting pond is provided with secondary
The addition entrance of sodium chlorate solution；The sedimentation basin is provided with the addition entrance of flocculant.
Tank is provided between the stripper and the cooling tower；The tank can carry out effectively slow to waste water
Punching, increase retention time of sewage and oxidization time.
The system also includes DCS control systems.
The waste water enters sedimentation basin in integrated reacting pond by way of overflow, and flocculation is added in sedimentation basin
Agent；The sludge outlet of the sedimentation basin is connected with sludge-tank；
The outlet of the reuse tank is connected in parallel the preparation unit and salt dissolving reuse unit of sodium hypochlorite.Clear liquid after processing
Salt dissolving reuse unit can be entered, be utilized again, into production；The preparation unit of sodium hypochlorite is can also pass into, again
Configure liquor natrii hypochloritis, the redox reaction for step 2).
Preferred scheme as the present invention, there is provided a kind of method of the recovery containing sodium hypochlorite waste water, the waste water is successively
By the stripper containing air blower, tank, cooling tower, integrated reacting pond, sedimentation basin, reuse tank；The sedimentation basin
Sludge outlet is also connected with sludge-tank；The outlet of the reuse tank is connected in parallel the preparation unit and salt dissolving reuse list of sodium hypochlorite
Member.
The method for handling the Phosphorus From Wastewater element comprises the following steps：
1) waste water carries out blast gasification in stripper, and gaseous state waste water is in MnSO4Under effect, it is anti-to carry out preliminary oxidation
Should, then flow into cooling column and carry out being cooled to 35~45 DEG C；
2) waste water of cooling column outflow flows into integrated reacting pond, regulation pH value to 3~5, it is molten that addition sodium hypochlorite is added dropwise
After liquid carries out oxidation reaction；
3) waste water inflow sedimentation basin after oxidation, adjustment pH value to 5~8, the combination flocculant of PAM and iron chloride is added
Precipitation process, clear liquid reuse.
Wherein, the addition of the catalyst, the liquor natrii hypochloritis and the flocculant is controlled by DCS control systems.
The present invention at least has the advantages that：
In purification process, sodium hypochlorite, which absorbs, to be aoxidized, but the amount due to oxidant and the limitation of oxidization time, in waste water
The elements such as sulphur, phosphorus can not be fully oxidized to sulfate radical or phosphate radical, particularly P elements, and a large amount of unreacteds can be produced in waste water
The phosphate radical of complete anon-normal phosphorus form；According to phosphate radical chemical property, in addition to the metallic salt material of orthophosphoric acid root, other valencys
The phosphorus salts substances of state are dissolved in water, cause the total phosphorus concentration of waste water high, it is difficult to remove in subsequent treatment process again, influence
Water water quality.Method of the present invention is by adding sodium hypochlorite, and using the Strong oxdiative ability of sodium hypochlorite, effective oxidation is useless
The phosphorus and COD of other valence states in water；Method of the present invention is easy to operate, easily controllable, without additional energy consumption, and PVC
The byproduct of enterprise's production has liquor natrii hypochloritis, and it is convenient to obtain, and cost is cheap；
The first step air oxidation of the present invention is waste water is fully contacted with air by air blower, utilizes the oxygen in air
Gas aoxidizes and reducing substances in stripping waste water.After carrying out stair oxidation, by the way of secondary oxidation, stair oxidation uses
Air oxidation removes part phosphorus, and secondary oxidation by the phosphate radical exhaustive oxidation of anon-normal phosphorus form, makes to arrive for useless time using sodium hypochlorite
Up to the requirement of reuse salt dissolving.Present invention process flow is simple, and water process and waste water recycling expense are low, realizes the recovery profit of water resource
With.
Brief description of the drawings
Fig. 1 is the flow chart of the processing method of embodiment 3；
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Following experiment carries out simulated experiment using simulated wastewater；To ensure time effect of sodium wastewater oxidation, secondary sodium is given up
Water carries out simulation oxidation experiment；The water quality of waste water is as shown in table 1：Waste water quality is described in table 1 below：
The waste water quality of table 1
| Sequence number | Project | Unit | Numerical value |
| 1 | Temperature | ℃ | ~30 |
| 2 | Total phosphorus | mg/L | ≈2000 |
| 3 | Positive phosphorus ratio | / | ≈ 60% |
| 4 | pH | / | 7.5~9.0 |
Embodiment 1
The present embodiment is a kind of simulated experiment of the recovery containing sodium hypochlorite waste water method.
This experiment points three groups, first adds 500mL sodium hypochlorite waste waters in beaker, be then respectively adding 4mL, 5mL,
6mL mass concentrations are 10% liquor natrii hypochloritis, stir fully reaction, separately sampled after 4 hours, 8 hours.
The PAC that 0.1mL mass concentrations are 0.1% is added in sampling waste, adds 0.1mL mass concentrations as 0.1%
PAM, remove orthophosphates.
The test data of table 2
After being separately added into 4mL sodium hypochlorite, 5mL sodium hypochlorite, 6mL sodium hypochlorite, it is computed, the chlorine residue in water is respectively
1000mg/L, 1250mg/L, 1500mg/L.
As shown in Table 2, when adding 5ml sodium hypochlorite, the content of total phosphorus differed very little in sampling in 4 hours and 8 hours, i.e., just
Aerobicization is complete；And oxidized complete when 4h, contents of residual chlorine is also few, but water outlet total phosphorus also has 50
More milligrams per liter, due to phosphorus, to enter water content higher, it is contemplated that PAC is precipitated to the removal effect of phosphorus using combination medicament.
Embodiment 2
The present embodiment uses the identical simulated experiment of embodiment 1, there is provided a kind of method of the recovery containing sodium hypochlorite waste water.
This three groups of experiment point, first adds 500mL sodium hypochlorite waste waters in beaker, adds, 5mL mass concentrations are 10%
Liquor natrii hypochloritis, stir simultaneously take a sample every 4 hours, 8 hours.Water sample is subjected to coagulating kinetics, aoxidized
Mass ratio is added in water sample afterwards respectively as 1:1、2:1、2.15:1、3:1 PAM is handled with iron chloride, investigates going for phosphorus
Except effect.
The test data of table 3
As seen from the above table, after using PAM and iron chloride combination medicament, the removal effect of total phosphorus is better than PAC, PAM removal
Effect.
Phosphorus content fluctuation is big in sodium hypochlorite waste water, and when total phosphorus content is 2720mg/L, adding sodium hypochlorite contains chlorine
Measure for 1250mg/L when, reacted by 4 hours, the metaphosphate in water effectively can be oxidized to orthophosphates, speculated
PAM and iron chloride mass ratio 2.15:1 combination medicament is precipitated, and water outlet total phosphorus can be made to drop to below 30mg/L, hypochlorous acid
The conversion ratio of sodium phosphorous oxide can reach 99%；
Table 4 designs water outlet water quality index table
| Sequence number | Project | Unit | Numerical value |
| 1 | PH | Dimensionless | 5~8 |
| 2 | Positive phosphorus conversion ratio | / | ≤ 95% |
Embodiment 3
It is a kind of recovery the system containing sodium hypochlorite waste water, including be connected in series stripper, tank, cooling tower, one
Body reaction tank, sedimentation basin, reuse tank；The sludge outlet of the sedimentation basin is connected with sludge-tank；The outlet of the reuse tank is in parallel
Connect the preparation unit and salt dissolving reuse unit of sodium hypochlorite；And control adding for catalyst, liquor natrii hypochloritis and flocculant
Add by DCS control systems；Flow chart as shown in Figure 1.
Wherein, the stripper is provided with air blower, and catalyst addition entrance；The integrated reacting pond is provided with secondary
The addition entrance of sodium chlorate solution；The sedimentation basin is provided with the addition entrance of flocculant.
The method for handling the Phosphorus From Wastewater element comprises the following steps：
1) waste water flows into stripper, and gaseous state waste water is in MnSO4Effect is lower to carry out preliminary oxidation, flows into cooling column and carries out
It is cooled to 35~45 DEG C；
2) waste water of cooling column outflow flows into integrated reacting pond, regulation pH value to 4, addition liquor natrii hypochloritis is added dropwise and enters
After row oxidation reaction, outflow；
3) waste water of integrated reacting pond outflow flows into sedimentation basin, adds the combination flocculant place of settling of PAM and iron chloride
Reason, clear liquid discharge reuse tank；
DCS control systems control the addition of the catalyst, the liquor natrii hypochloritis and the flocculant.
Comparative example 1
Using the identical method of embodiment 1, the liquor natrii hypochloritis that 4mlL concentration is 10% is added, is aoxidized 8 hours；Only
Remove catalyst MnSO4, using air oxidation, not it is possible to additionally incorporate liquor natrii hypochloritis carry out secondary oxidation reaction reclaimed it is molten
Liquid total phosphorus；
As a result determine：
1st, former total phosphorus 2700mg/L, total phosphorus 700mg/L after processing.
2nd, former COD1300mg/L, COD600mg/L after processing.
Although above the present invention is made to retouch in detail with general explanation, embodiment and experiment
State, but on the basis of the present invention, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, are belonged to claimed
Scope.
Claims (10)
1. a kind of method of the recovery containing sodium hypochlorite waste water, it is characterised in that the described method comprises the following steps：
1) waste water is subjected to blast gasification, gaseous state waste water carries out preliminary oxidation reaction, then at cooling under catalyst action
Reason；
2) in waste water after the cooling period, liquor natrii hypochloritis is added dropwise and carries out oxidation reaction；
3) in waste water after oxidation, after adding flocculant progress precipitation process, clear liquid reuse.
2. according to the method for claim 1, it is characterised in that catalyst described in step 1) is MnSO4, the catalyst
Addition quality be the waste water total amount 0.10 ‰~0.15 ‰.
3. method according to claim 1 or 2, it is characterised in that the temperature cooled down described in step 2) is 35~45 DEG C；
And/or when the liquor natrii hypochloritis being added dropwise in step 2), the pH value of the waste water is 3~5.
4. according to any described method of claims 1 to 3, it is characterised in that liquor natrii hypochloritis's described in step 2) is dense
Spend for 8%~12%；The addition quality of the liquor natrii hypochloritis is the 10% of the waste water total amount.
5. according to any described method of Claims 1 to 4, it is characterised in that flocculant described in step 3) be selected from calcium chloride,
One or more in PAC, PAM or iron chloride；
Preferably PAM and iron chloride combination flocculant, the ratio of PAM and iron chloride is 2~3 in the combination flocculant:1；
It is highly preferred that the addition of the flocculant is the 0.3% of the waste water total amount；
And/or when the flocculant is added in step 3), the pH value of the waste water is adjusted to 5~8.
6. according to any described method of Claims 1 to 5, it is characterised in that the catalyst, the liquor natrii hypochloritis and
The addition of the flocculant is controlled by DCS control systems.
7. according to any described method of claim 1~6, it is characterised in that total phosphorus is 1500 in the sodium hypochlorite waste water
~3000ml/L.
8. a kind of system for realizing any methods described of claim 1~7, it is characterised in that the system includes being connected in series
Stripper, cooling tower, integrated reacting pond, sedimentation basin, reuse tank；
Wherein, the stripper is provided with air blower, and catalyst addition entrance；The integrated reacting pond is provided with hypochlorous acid
The addition entrance of sodium solution；The sedimentation basin is provided with the addition entrance of flocculant.
9. system according to claim 8, it is characterised in that be provided with water storage between the stripper and the cooling tower
Pond；
And/or the system also includes DCS control systems.
10. system according to claim 8 or claim 9, it is characterised in that the sludge outlet of the sedimentation basin is connected with sludge-tank；
And/or the outlet of the reuse tank is connected in parallel the preparation unit and salt dissolving reuse unit of sodium hypochlorite.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109824199A (en) * | 2019-03-22 | 2019-05-31 | 盛隆资源再生（无锡）有限公司 | A kind of processing method of the high COD film production waste water containing sodium hypochlorite, PVP |
| CN109879505A (en) * | 2019-03-25 | 2019-06-14 | 天津市郁峰化工有限公司 | A kind for the treatment of process containing sodium hypochlorite waste water |
| CN109912075A (en) * | 2019-03-25 | 2019-06-21 | 天津市郁峰化工有限公司 | A kind of recycling and reusing method of sodium hypochlorite waste water |
| CN110467231A (en) * | 2019-07-26 | 2019-11-19 | 新疆中泰化学阜康能源有限公司 | The peace and quiet waste water carnallite refining treatment apparatus of acetylene gas sodium hypochlorite and method |
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| CN110467231A (en) * | 2019-07-26 | 2019-11-19 | 新疆中泰化学阜康能源有限公司 | The peace and quiet waste water carnallite refining treatment apparatus of acetylene gas sodium hypochlorite and method |
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