CN111410284A - Neutralization conditioning agent for wastewater treatment and preparation method and application thereof - Google Patents
Neutralization conditioning agent for wastewater treatment and preparation method and application thereof Download PDFInfo
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- CN111410284A CN111410284A CN201911377779.8A CN201911377779A CN111410284A CN 111410284 A CN111410284 A CN 111410284A CN 201911377779 A CN201911377779 A CN 201911377779A CN 111410284 A CN111410284 A CN 111410284A
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- Prior art keywords
- neutralization
- sulfate
- ferric sulfate
- reaction
- wastewater treatment
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- 238000006386 neutralization reaction Methods 0.000 title claims abstract description 52
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 7
- 238000002360 preparation method Methods 0.000 title abstract description 11
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical group [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 abstract description 33
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002351 wastewater Substances 0.000 claims abstract description 20
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 16
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 16
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 16
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 15
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- 230000016615 flocculation Effects 0.000 claims abstract description 13
- 238000007639 printing Methods 0.000 claims abstract description 12
- 238000004043 dyeing Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 32
- 239000000126 substance Substances 0.000 abstract description 17
- 238000005496 tempering Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 13
- 230000000051 modifying effect Effects 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000003472 neutralizing effect Effects 0.000 abstract description 8
- 239000000383 hazardous chemical Substances 0.000 abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 32
- 239000007788 liquid Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002253 acid Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 240000006108 Allium ampeloprasum Species 0.000 description 1
- 235000005254 Allium ampeloprasum Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000012356 Product development Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Images
Classifications
-
- 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
- C02F1/52—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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and discloses a neutralization conditioning agent for wastewater treatment, a preparation method and application thereof, wherein the main component is ferric sulfate, and a small amount of proper polymeric ferric sulfate, ferrous sulfate, sodium sulfate and the like are added; in the process of neutralizing the printing and dyeing wastewater by ferric sulfate, polymeric ferric sulfate, ferrous sulfate, sodium sulfate and the like are added to adjust to a proper proportion of the modifying agent. The neutralization reaction and the flocculation tempering process are carried out synchronously. The neutralization tempering agent is a non-hazardous chemical substance, has no corrosivity to people or equipment, reduces the potential safety hazard to the minimum, and correspondingly reduces the safety cost. When the neutralization modifying agent and the wastewater are subjected to neutralization reaction, the reaction is very gentle, the reaction progress is easy to control, the requirements of operators are reduced, and the effect after the neutralization reaction is ensured. The neutralization reaction and the flocculation tempering process are carried out synchronously, so that the neutralization tempering effect can be intuitively understood.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a neutralization conditioning agent for wastewater treatment as well as a preparation method and application thereof.
Background
Currently, the closest prior art: with the stricter requirements of the country on environmental protection, all walks of life have stricter regulations on the emission of pollutants. The environmental protection supervision groups established by the nation supervise and direct the environmental destruction behaviors all over the country, and the original behavior that related production enterprises directly discharge pollutants to the external environment is effectively suppressed, so that the interior of the enterprises also put forward a great deal of urgent needs and demands on the treatment of the pollutants.
Contaminants can be classified into three broad categories by morphology: solid contaminants, liquid contaminants, gaseous contaminants. The state has different requirements on the discharge of liquid pollutants, and the minimum requirement is the discharge requirement of municipal pipe networks. Wastewater produced in enterprises needs to be treated according to relevant indexes (such as pH, COD, total nitrogen, total phosphorus and the like) to meet the requirements of a municipal pipe network, and can be discharged into the municipal pipe network and enter a sewage treatment plant.
Compared with common sewage, the waste water of the printing and dyeing mill has the characteristics of high content of organic pollutants, complex components, large alkalinity, large water quality change and the like, belongs to one of industrial waste water which is difficult to treat, and contains dye, printing ink, sizing agent, auxiliary agent, oil agent, acid and alkali, inorganic salt and the like. In the process of treating the printing and dyeing wastewater, after solid particles and the like in the wastewater are removed, the primary task is thermal refining, the pH of the wastewater is adjusted to the range required by the subsequent process, and the thermal refining of the property of the wastewater is carried out to meet the requirement that a subsequent wastewater treatment unit can treat the wastewater. The existing production process adopts 30% dilute sulfuric acid as a neutralization tempering agent, the sulfuric acid belongs to dangerous chemicals, and although the material treatment effect is good, the production operation has larger risk and has larger hidden danger.
Most of the waste water of the printing and dyeing mill is high-alkalinity, and an acidic substance needs to be added for neutralization reaction to meet the requirement of subsequent treatment. The importance of pH neutralization and tempering determines the importance of the selection of the neutralization regulator.
In summary, the problems of the prior art are as follows:
(1) the existing medicament for reducing PH adopts 30% dilute sulfuric acid, has a quick reaction effect, but has a large operation risk, and the article belongs to dangerous chemicals, has great harm to human bodies, and is very easy to cause safety accidents due to improper operation.
(2) The sulfuric acid belongs to strong acid, the reaction is violent, the adding amount is extremely difficult to control during operation, the material waste is caused when the adding amount is exceeded, the material denaturation is easy to cause, and the flocculation and sedimentation of the material in the subsequent procedure are not facilitated.
(3) The country controls dangerous chemicals more and more strictly, and the purchase is more difficult, also has great risk to customer's storage, and the enterprise is unwilling to take risk and continue to use, and the country is restricted dangerous chemical road simultaneously, leads to raw and other materials to unload and generally all evening, also has the risk of unloading.
The difficulty of solving the technical problems is as follows: can replace dangerous chemicals and adopt cheap products. Sulfuric acid is a strong acid, not only is the acidity strong, but also can solidify materials, and the problem that other weak acids cannot solve is solved. The substitute needs to ensure that the pH value can be reduced when the substitute reacts with the printing and dyeing waste liquid, and simultaneously has a quick curing effect on impurities in the printing and dyeing waste liquid, and has high requirements on the using amount.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a neutralization modifying agent for wastewater treatment and a preparation method and application thereof.
The invention is realized in such a way that the neutralizing and tempering agent for wastewater treatment consists of ferric sulfate, polymeric ferric sulfate, ferrous sulfate and sodium sulfate. The invention also aims to provide a preparation method of the neutralization conditioner for wastewater treatment, which is characterized in that polymeric ferric sulfate, ferrous sulfate and sodium sulfate are added into printing and dyeing wastewater through neutralization by ferric sulfate to adjust the proportion of the conditioner.
Further, the neutralization reaction and the flocculation conditioning process are carried out synchronously.
The invention also aims to provide an application of the neutralization modifying agent for wastewater treatment in wastewater treatment.
In summary, the advantages and positive effects of the invention are:
compared with the traditional method of using strong acids such as hydrochloric acid or sulfuric acid and the like for wastewater neutralization reaction, the method has the advantages that the strong acids such as hydrochloric acid and sulfuric acid are dangerous chemicals and have great dangerousness in transportation, storage and use, the neutralization modifier is a non-dangerous chemical and has no corrosivity to people or equipment, the potential safety hazard is minimized, and the safety cost is correspondingly reduced.
When the neutralization modifying agent and the wastewater are subjected to neutralization reaction, the reaction is very gentle, the reaction progress is easy to control, the requirements of operators are reduced, and the effect after the neutralization reaction is ensured.
The neutralization and tempering agent has flocculation effect and can play a role in tempering. Ferric sulfate has flocculation, and can be supplemented with polyferric sulfate, ferrous sulfate, sodium sulfate, etc. by adjusting to a proper proportion of modifying agent, flocculation can be enhanced, and the dosage of subsequent flocculant can be reduced.
The neutralization reaction and the flocculation tempering process are carried out synchronously, so that the neutralization tempering effect can be intuitively understood.
For treatment 4m3The printing and dyeing wastewater is compared by adopting 30 percent dilute sulfuric acid to react with a neutralizing and tempering agent
In the centrifugal dewatering treatment system of the waste water concentrated solution, sulfuric acid is originally selected as a chemical neutralization reagent for use. Because sulfuric acid is a dangerous chemical, and has a large risk in transportation, storage and use, reagent screening, matching and demonstration are carried out through a large number of experiments, a neutralization modulator capable of replacing sulfuric acid is provided for a treatment process, and the appearance of an aqueous solution of the neutralization modulator is dark brown. The main component of the powder is ferric sulfate, and other small amount of regulators are polymeric ferric sulfate, ferrous sulfate and sodium sulfate. All chemicals in the neutralization preparation are non-hazardous chemicals, and aqueous solutions thereof are also non-hazardous chemicals. The product development replaces the original sulfuric acid effect, and simultaneously avoids the risks and subsequent potential safety hazards in the use of the product.
Aiming at the problems, the invention can completely replace the action of sulfuric acid, has great significance for enterprises to break away from dangerous chemicals, and reduces the possibility of generating high-risk risks in production. Most importantly, the addition of the neutralization and tempering agent reduces the intensity of the reaction, smoothly performs the neutralization reaction on the materials, and simultaneously has good curing effect.
Drawings
FIG. 1 is a flow chart of a method for preparing a neutralization conditioner for wastewater treatment according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings.
The neutralization conditioning agent for wastewater treatment provided by the embodiment of the invention consists of ferric sulfate, polymeric ferric sulfate, ferrous sulfate and sodium sulfate. Ferric sulfate powder at 93% and small amounts of other water treatment agents: non-public reagents such as 1.5% of polymeric ferric sulfate, 1% of ferrous sulfate, 1.5% of sodium sulfate and the like are prepared into an aqueous solution with the concentration of 20% with water. The requirement on density control is high and reaches 1.150 to 1.160g/cm3And controlling a certain pH value.
As shown in fig. 1, the preparation method of the neutralization conditioner for wastewater treatment provided by the embodiment of the invention comprises the following steps:
1. will now be 1.4m3Water is weighed and is sent into a configuration barrel with a stirring function by a pump;
2. starting a preparation barrel for stirring, uniformly adding ferric sulfate powder with specified weight into the preparation barrel, uniformly stirring, observing the character of formed liquid, and detecting the pH and density of the liquid;
3. adding the set formula agent;
4. adding polymeric ferric sulfate, ferrous sulfate and sodium sulfate according to the proportion and component requirements, monitoring the material form and liquid phase color change, and stirring for 1h to ensure that the materials are uniformly mixed;
5. and finally, detecting the pH value and the liquid density, and conveying the liquid into a packaging barrel by using a pump after the pH value and the liquid density reach the design values.
In the process of neutralizing the printing and dyeing wastewater by the ferric sulfate, polymeric ferric sulfate, ferrous sulfate, sodium sulfate and the like are added to adjust to a proper proportion of the modifying agent. The neutralization reaction and the flocculation tempering process are carried out synchronously.
The invention can play a role in neutralizing the printing and dyeing wastewater by utilizing the strong acid and the weak alkali of the ferric sulfate; the acidity of the ferric sulfate is mild, the reaction is mild during the neutralization reaction, and the reaction process is easy to control; the ferric sulfate of the invention has flocculation effect, and other small amount of modifying agent (polymeric ferric sulfate, ferrous sulfate, sodium sulfate, etc.) is additionally arranged to enhance modifying effect.
The neutralization modifying agent adopts ferric sulfate (strong acid and weak base salt is used for neutralizing alkaline wastewater and has flocculation effect) as a main component, and a small amount and a proper amount of polymeric ferric sulfate, ferrous sulfate, sodium sulfate and the like are added into the neutralization modifying agent to enhance the flocculation effect, so that the neutralization modifying process is synchronously carried out, the use amount of a subsequent flocculant is reduced, and the potential safety hazard of the whole process is reduced.
In the centrifugal dewatering treatment system of the waste water concentrated solution, sulfuric acid is originally selected as a chemical neutralization reagent for use. Because sulfuric acid is a dangerous chemical, and has a large risk in transportation, storage and use, the west ampere nomadic environment science and technology limited company conducts reagent screening, matching and demonstration through a large number of experiments, provides a neutralization modulator capable of replacing sulfuric acid for a treatment process, and the appearance of an aqueous solution of the neutralization modulator is dark brown. The main component of the powder is ferric sulfate, and other small amount of concoction agents are polymeric ferric sulfate, ferrous sulfate, sodium sulfate and other non-public agents.
All chemicals in the neutralization preparation are non-hazardous chemicals, and aqueous solutions thereof are also non-hazardous chemicals.
Detection report of neutralizing modifying agent
Chemical Chinese name: neutralizing and tempering agent
The main components of the water treatment agent are ferric sulfate powder (accounting for 93 percent) and a small amount of other water treatment agents (polymeric ferric sulfate, ferrous sulfate and other leek disclosing agents), and the water treatment agent and water are prepared into an aqueous solution with the concentration of 20 percent.
Appearance and properties: tan, liquid;
concentration of the solution: 1% of 20 soil;
pH value: 1.1;
relative density (water ═ 1))：1.155g/cm3；
Boiling point (. degree. C.): 102 ℃;
shelf life: 6 months;
storage considerations: storing in a cool and ventilated storehouse. Away from the heat source. The package must be sealed. Should be stored separately from the alkalis, and should not be mixed with each other. When the storage area is leaked, the valve is closed, and the water can be diluted and washed to the drainage trench and merged into the plant area, a sewage treatment station or covered by sand for treatment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The neutralization conditioner for wastewater treatment is characterized by being prepared from the following materials in parts by weight: 90-95% of ferric sulfate, 1-2% of polymeric ferric sulfate, 0.1-2% of ferrous sulfate, 1-2% of sodium sulfate and 8-10% of aqueous solution.
2. The method for preparing the neutralization conditioner for wastewater treatment according to claim 1, wherein the neutralization conditioner for wastewater treatment is prepared by adding polymeric ferric sulfate, ferrous sulfate and sodium sulfate into printing and dyeing wastewater by neutralization of ferric sulfate, and adjusting the mixture ratio of the conditioner.
3. The method of claim 2, wherein the neutralization reaction is performed simultaneously with the flocculation conditioning process.
4. Use of the neutralization conditioner for wastewater treatment according to claim 1 in wastewater treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911377779.8A CN111410284A (en) | 2019-12-27 | 2019-12-27 | Neutralization conditioning agent for wastewater treatment and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911377779.8A CN111410284A (en) | 2019-12-27 | 2019-12-27 | Neutralization conditioning agent for wastewater treatment and preparation method and application thereof |
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| CN111410284A true CN111410284A (en) | 2020-07-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01215399A (en) * | 1988-02-23 | 1989-08-29 | Dowa Mining Co Ltd | Method for cleaning waste water |
| CN101348294A (en) * | 2008-08-29 | 2009-01-21 | 西北师范大学 | Solid composite polymeric ferric sulfate flocculant and preparation thereof |
| RU2438993C1 (en) * | 2010-08-09 | 2012-01-10 | Общество с ограниченной ответственностью Научно-производственное предприятие "ТРИВЕКТР" | Method of producing iron-silicon flocculant-coagulant and water treatment method |
| CN102718295A (en) * | 2012-06-01 | 2012-10-10 | 浙江省环境保护科学设计研究院 | Compound medicament for treating coking wastewater and preparation method thereof |
| CN108996634A (en) * | 2018-07-24 | 2018-12-14 | 河南工程学院 | It is a kind of for handling the preparation method of the polymeric ferric sulfate flocculant of waste water from dyestuff |
-
2019
- 2019-12-27 CN CN201911377779.8A patent/CN111410284A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01215399A (en) * | 1988-02-23 | 1989-08-29 | Dowa Mining Co Ltd | Method for cleaning waste water |
| CN101348294A (en) * | 2008-08-29 | 2009-01-21 | 西北师范大学 | Solid composite polymeric ferric sulfate flocculant and preparation thereof |
| RU2438993C1 (en) * | 2010-08-09 | 2012-01-10 | Общество с ограниченной ответственностью Научно-производственное предприятие "ТРИВЕКТР" | Method of producing iron-silicon flocculant-coagulant and water treatment method |
| CN102718295A (en) * | 2012-06-01 | 2012-10-10 | 浙江省环境保护科学设计研究院 | Compound medicament for treating coking wastewater and preparation method thereof |
| CN108996634A (en) * | 2018-07-24 | 2018-12-14 | 河南工程学院 | It is a kind of for handling the preparation method of the polymeric ferric sulfate flocculant of waste water from dyestuff |
Non-Patent Citations (1)
| Title |
|---|
| 孙竹梅;吴翔;方炯;杜冬云;: "偶氮染料印染废水预处理方法的比较研究", 工业水处理, no. 03, 20 March 2013 (2013-03-20), pages 51 - 54 * |
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