CN104876311B - For the alkaline molysite confection of heavy metal containing wastewater treatment and its compound method and application - Google Patents
For the alkaline molysite confection of heavy metal containing wastewater treatment and its compound method and application Download PDFInfo
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- CN104876311B CN104876311B CN201510223324.6A CN201510223324A CN104876311B CN 104876311 B CN104876311 B CN 104876311B CN 201510223324 A CN201510223324 A CN 201510223324A CN 104876311 B CN104876311 B CN 104876311B
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- molysite
- alkaline
- confection
- heavy metal
- iron salt
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- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 title claims abstract description 73
- 235000009508 confectionery Nutrition 0.000 title claims abstract description 52
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 34
- 150000001875 compounds Chemical class 0.000 title claims abstract description 27
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 43
- 150000002505 iron Chemical class 0.000 claims abstract description 30
- 239000012266 salt solution Substances 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 63
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 12
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 8
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 6
- 239000011790 ferrous sulphate Substances 0.000 claims description 5
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 4
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 239000010814 metallic waste Substances 0.000 description 5
- 238000011112 process operation Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- NNSSZQREGZERDE-UHFFFAOYSA-N [Sb].[As].[Cr] Chemical compound [Sb].[As].[Cr] NNSSZQREGZERDE-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 molysite Compound Chemical class 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005373 Panax quinquefolius Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- LITYQKYYGUGQLY-UHFFFAOYSA-N iron nitric acid Chemical compound [Fe].O[N+]([O-])=O LITYQKYYGUGQLY-UHFFFAOYSA-N 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a kind of alkaline molysite confection for heavy metal containing wastewater treatment and its compound method and application.The alkaline molysite confection is allocated by alkali lye and iron salt solutions and is made, and pH value is 8~10.Its preparation method is to prepare iron salt solutions and alkali lye first, then adds alkali lye in iron salt solutions, is stirred while the pH value of mixed liquor obtained by monitoring, until the pH value of mixed liquor is 8~10, obtains alkaline molysite confection.The alkaline molysite confection of the present invention has the advantages that the change of heavy metal pH value of waste water influences small, high treating effect, is easy to process stabilizing to run, and preparation method is simple, and raw material is cheap.The alkaline molysite confection can be applied in heavy metal containing wastewater treatment, and the change impact to pH is small, it is not necessary to pH is adjusted again, enormously simplify the complexity of operational administrative, and has reached good water treatment effect.
Description
Technical field
The invention belongs to heavy metal containing wastewater treatment field, and in particular to a kind of alkaline molysite for heavy metal containing wastewater treatment
Confection and its compound method and application.
Background technology
Iron salt method is to handle method relatively common in heavy metal wastewater thereby technical process, and its dominant mechanism is molysite in alkalescence
Fe be present simultaneously under environment2+、Fe3+、Fe(OH)2With Fe (OH)3Colloid, these materials can be with the arsenic in heavy metal wastewater thereby, antimony, six
The substance reactions such as valency chromium generate sediment not soluble in water, while Fe (OH)2With Fe (OH)3Colloid can adsorb colloidal state in waste water
Other heavy metal substances, so as to reach the purpose of removing heavy metals.
Because molysite is strong acid weak base salt, adding for molysite declines the pH of waste water, to maintain the reaction environment of alkalescence, needs
Add alkali lye and carry out pH regulations.The control that molysite reacts during process operation needs the control of two steps, i.e. molysite dosage
And the control of pH value, it is so high to the requirement of operational administrative and control.If the dosage of molysite is unstable to cause follow-up pH
What is adjusted is unstable, and it is unstable to ultimately result in PROCESS FOR TREATMENT effect.
The drawbacks of existing for iron salt method processing heavy metal wastewater thereby process operation process, need badly and its existing deficiency is carried out
Improve, so that process operation operational administrative and control are easy.
The content of the invention
The technical problem to be solved in the present invention is overcome the deficiencies in the prior art, there is provided a kind of heavy metal pH value of waste water
Change influences small, high treating effect, the alkaline molysite confection for heavy metal containing wastewater treatment for being easy to process stabilizing to run
And its compound method and application.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of alkaline molysite confection for heavy metal containing wastewater treatment, the alkaline molysite confection is by alkali lye
It is made with iron salt solutions allotment, the pH value of the alkaline molysite confection is 8~10.
In above-mentioned alkaline molysite confection, it is preferred that the iron salt solutions are to prepare to obtain with water by molysite, described
The mass concentration of molysite is 5%~10% in iron salt solutions；The alkali lye is to prepare to obtain with water by alkali compounds, the alkali
The mass concentration of liquid neutral and alkali compound is 4%~10%.
In above-mentioned alkaline molysite confection, it is preferred that the molysite include ferrous sulfate, ferric sulfate, frerrous chloride,
Iron chloride, ferrous nitrate or ferric nitrate.
In above-mentioned alkaline molysite confection, it is preferred that the alkali compounds includes calcium oxide, calcium hydroxide or hydrogen
Sodium oxide molybdena.
The technical concept total as one, the present invention also provide a kind of alkaline molysite for heavy metal containing wastewater treatment and mixed
The compound method of medicament, comprises the following steps：Alkali lye and iron salt solutions are prepared first, then add alkali lye in iron salt solutions,
Stir while the pH value of mixed liquor obtained by monitoring, until the pH value of mixed liquor is 8~10, that is, obtains basic iron salt mixing medicine
Agent.
In above-mentioned compound method, it is preferred that the iron salt solutions are to prepare to obtain with water by molysite, the iron salt solutions
The mass concentration of middle molysite is 5%~10%；The alkali lye is to prepare to obtain with water by alkali compounds, the alkali lye neutral and alkali
The mass concentration of compound is 4%~10%.
In above-mentioned compound method, it is preferred that the molysite include ferrous sulfate, ferric sulfate, frerrous chloride, iron chloride,
Ferrous nitrate or ferric nitrate.
In above-mentioned compound method, it is preferred that the alkali compounds includes calcium oxide, calcium hydroxide or sodium hydroxide.
The technical concept total as one, the present invention also provide a kind of above-mentioned alkaline molysite confection or above-mentioned matched somebody with somebody
Application of the alkaline molysite confection in heavy metal containing wastewater treatment, comprises the following steps made from method processed：By alkaline molysite
Confection is added into heavy metal wastewater thereby, addition polyacrylamide (PAM) progress flocculation reaction after stirring and evenly mixing, after standing,
Complete the processing of heavy metal wastewater thereby.
Compared with prior art, the advantage of the invention is that：
1. the raw material sources of the alkaline molysite confection of the present invention are extensive, cost is cheap, and the confection has application
Scope is wide, the change of heavy metal wastewater pH impact is small, the advantages that being easy to the stable operation of heavy metal waste water treatment process.
2. the compound method of the alkaline molysite confection of the present invention is simple to operate, cost is cheap, can solve medicament
The problems such as unstable caused process operation of pH controls that method occurs in application process is ineffective.
3. the alkaline molysite confection of the present invention overcomes prior art during applied to heavy metal containing wastewater treatment
The defects of pH value is unstable, high to the requirement of operational administrative and control, treatment effect is bad during process operation, is adding alkali
After property molysite confection, it is not necessary to which the pH value of heavy metal waste water is adjusted again, enormously simplify the complexity of operational administrative
Property, make process control operations process simple and convenient, and reached good water treatment effect.
Brief description of the drawings
Fig. 1 is the configuration flow figure of the alkaline molysite confection of the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
Raw material (industrial reagent) and instrument employed in following examples are commercially available.
A kind of alkaline molysite confection for heavy metal containing wastewater treatment of the invention, the alkaline molysite confection are
It is made by alkali lye and iron salt solutions allotment, the pH value of the alkaline molysite confection is 8~10.
In present embodiment, iron salt solutions are to prepare to obtain with water by molysite, and mass concentration is 5%~10%, and alkali lye is
Prepare to obtain with water by alkali compounds, mass concentration is 4%~10%.
In present embodiment, molysite includes ferrous sulfate, ferric sulfate, frerrous chloride, iron chloride, ferrous nitrate or nitric acid
Iron.
In present embodiment, alkali compounds includes calcium oxide, calcium hydroxide or sodium hydroxide.
A kind of compound method of the alkaline molysite confection of above-mentioned the present embodiment, technological process are including following referring to Fig. 1
Step：
(1) preparation of iron salt solutions and alkali lye：Molysite is taken to be dissolved in the 250mL beakers (i.e. iron salt dissolved groove) for filling clear water
In, stirring and dissolving, prepare the iron salt solutions that mass concentration is 5%~10%.
Take alkali compounds to be dissolved in the 250mL beakers (i.e. alkali dissolving tank) for filling clear water, stirring and dissolving, it is dense to prepare quality
Spend the alkali lye for 4%~10%.
(2) preparation of alkaline molysite confection：The alkali lye prepared in step (1) is slowly added into to fill molysite molten
In the alkaline molysite Compound mixed solution groove of liquid, stir while the pH value of gained mixed liquor is monitored, until the pH value of mixed liquor
For 8~10, alkaline molysite confection is obtained, wastewater treatment can be carried out with heavy metal waste water treatment process chemical feeding points are pumped to.
A kind of application of the alkaline molysite confection of above-mentioned the present embodiment in heavy metal containing wastewater treatment, including following step
Suddenly：
Above-mentioned alkaline molysite confection is added into heavy metal wastewater thereby, and (toss area is conventional heavy metal containing wastewater treatment work
Skill chemical feeding points), polyacrylamide (PAM) is added after stirring and evenly mixing and carries out flocculation reaction, after standing, completes the place of heavy metal wastewater thereby
Reason.
Embodiment 1
A kind of alkaline molysite confection for heavy metal containing wastewater treatment of the invention, the alkaline molysite confection are
It is made by alkali lye and iron salt solutions allotment, the pH value of the alkaline molysite confection is 9.
In the present embodiment, iron salt solutions are the copperas solutions that mass concentration is 9.1%, and alkali lye is that mass concentration is
4.8% sodium hydroxide solution.
A kind of compound method of the alkaline molysite confection of above-mentioned the present embodiment, technological process are including following referring to Fig. 1
Step：
(1) preparation of iron salt solutions and alkali lye：Take 10g ferrous sulfate to be dissolved in and fill the 250mL beakers of 100mL clear water (i.e.
Iron salt dissolved groove) in, stirring and dissolving, obtain the copperas solution that mass concentration is 9.1%.
Take 5g sodium hydroxides to be dissolved in the 250mL beakers (i.e. alkali dissolving tank) for filling 100mL clear water, stirring and dissolving, obtain
Mass concentration is 4.8% sodium hydroxide solution.
(2) preparation of alkaline molysite confection：The sodium hydroxide solution prepared in step (1) is slowly added into Sheng
Have in the alkaline molysite Compound mixed solution groove of copperas solution, stir while monitor gained mixed liquor pH value, until
The pH value of mixed liquor is 9, obtains alkaline molysite confection, can be given up with heavy metal waste water treatment process chemical feeding points are pumped to
Water process.
A kind of application of above-mentioned alkaline molysite confection manufactured in the present embodiment in heavy metal containing wastewater treatment, including with
Lower step：
The above-mentioned alkaline molysite confections of 10mL are added into 400mL heavy metal wastewater therebies (simulated wastewater), and (toss area is normal
The heavy metal waste water treatment process chemical feeding points of rule), the water quality of heavy metal wastewater thereby is as shown in table 1, and 1 ‰ mass are added after stirring and evenly mixing
Polyacrylamide (PAM) the solution 0.5ml of concentration carries out flocculation reaction, stands 30 minutes, takes supernatant to detect indices, warp
The heavy metal wastewater thereby water quality added after alkaline molysite confection processing is as shown in table 2.
The before processing heavy metal wastewater thereby water quality of table 1 (in addition to pH is dimensionless, other index units are mg/L)
| Project | Arsenic | Antimony | Chromium | pH |
| Heavy metal wastewater thereby | 2 | 2 | 5 | 7.84 |
Table 2 add heavy metal wastewater thereby water quality after alkaline molysite confection (in addition to pH is dimensionless, other index units
For mg/L)
| Project | Arsenic | Antimony | Chromium | pH |
| Heavy metal wastewater thereby | 0.3 | 0.4 | 0.05 | 8.13 |
As can be seen from Table 1 and Table 2, add alkaline molysite confection for the arsenic in heavy metal wastewater thereby, antimony, chromium etc. from
Son has good removal effect, and pH is slightly improved, but changes little.As can be seen here, alkaline molysite confection of the invention
During applied to heavy metal containing wastewater treatment, overcome pH value in prior art processes running it is unstable, to operation pipe
The defects of requirement of reason and control is high, treatment effect is bad, after alkaline molysite confection is added, it is not necessary to heavy metal again
The pH value of waste water is adjusted, and enormously simplify the complexity of operational administrative, makes process control operations process simple and convenient, and reach
Good water treatment effect is arrived.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example.All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It is noted that for the art
Those of ordinary skill for, improvements and modifications under the premise without departing from the principles of the invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of application of alkaline molysite confection in heavy metal containing wastewater treatment, comprises the following steps：Alkaline molysite is mixed
Conjunction adding of agent is into heavy metal wastewater thereby, addition polyacrylamide progress flocculation reaction after stirring and evenly mixing, and after standing, completes a huge sum of money
Belong to the processing of waste water；
The alkaline molysite confection is made by alkali lye and iron salt solutions allotment, the pH value of the alkaline molysite confection
For 8~10；The iron salt solutions are to prepare to obtain with water by molysite, in the iron salt solutions mass concentration of molysite be 5%~
10%；The alkali lye is to prepare to obtain with water by alkali compounds, the mass concentration of the alkali lye neutral and alkali compound for 4%~
10%；
Or comprise the following steps for the compound method of the alkaline molysite confection of heavy metal containing wastewater treatment：Prepare first
Alkali lye and iron salt solutions, then alkali lye is added in iron salt solutions, stir while the pH value of mixed liquor obtained by monitoring, up to
The pH value of mixed liquor is 8~10, that is, obtains basic iron salt confection；The iron salt solutions are to prepare to obtain with water by molysite,
The mass concentration of molysite is 5%~10% in the iron salt solutions；The alkali lye is to prepare to obtain with water by alkali compounds, described
The mass concentration of alkali lye neutral and alkali compound is 4%~10%.
2. application of the alkaline molysite confection according to claim 1 in heavy metal containing wastewater treatment, it is characterised in that
The molysite includes ferrous sulfate, ferric sulfate, frerrous chloride, iron chloride, ferrous nitrate or ferric nitrate.
3. application of the alkaline molysite confection according to claim 1 in heavy metal containing wastewater treatment, it is characterised in that
The alkali compounds includes calcium oxide, calcium hydroxide or sodium hydroxide.
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| CN1792853A (en) * | 2005-11-17 | 2006-06-28 | 上海交通大学 | Combined treating process for waste water of basic printing and dyeing |
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Non-Patent Citations (2)
| Title |
|---|
| "WASTE Fe(III)/Cr(III) HYDROXIDE AS ADSORBENT FOR THE REMOVAL OF Cr(VI) FROM AQUEOUS SOLUTION AND CHROMIUM PLATING INDUSTRY WASTEWATER";C. Namasivayam 等;《Environmental Pollution》;19931231;第82卷;第255-260页材料方法部分，结果与讨论部分，结论部分 * |
| 利用SPSS17 .0 探讨制备氢氧化铁胶体的最佳实验条件;孙影 等;《化学教育》;20110331(第3期);第59-60页实验部分、SPSS17.0软件进行正交实验设计及统计学分析 * |
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Address after: 410005 Changsha province hi tech Development Zone, Hunan Sheng Road, No. 673 Applicant after: CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO., LTD. Address before: 410013, 673, Xin Sheng Road, hi tech Development Zone, Hunan, Changsha Applicant before: Changsha China Huashijie Science & Technology Development Co., Ltd. |
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Denomination of invention: Alkaline iron salt mixed reagent for treating heavy metal wastewater as well as preparation method and application thereof Effective date of registration: 20190926 Granted publication date: 20171208 Pledgee: Bank of Changsha Limited by Share Ltd science and Technology Branch Pledgor: CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO., LTD. Registration number: Y2019430000024 |
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Date of cancellation: 20201124 Granted publication date: 20171208 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT Co.,Ltd. Registration number: Y2019430000024 |
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Denomination of invention: Preparation and application of alkaline iron salt mixed reagent for heavy metal wastewater treatment Effective date of registration: 20201202 Granted publication date: 20171208 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT Co.,Ltd. Registration number: Y2020980008713 |