CN105712465B - A kind of chemical nickel waste water treating agent - Google Patents
A kind of chemical nickel waste water treating agent Download PDFInfo
- Publication number
- CN105712465B CN105712465B CN201610296684.3A CN201610296684A CN105712465B CN 105712465 B CN105712465 B CN 105712465B CN 201610296684 A CN201610296684 A CN 201610296684A CN 105712465 B CN105712465 B CN 105712465B
- Authority
- CN
- China
- Prior art keywords
- waste water
- chemical nickel
- oxidant
- nickel
- alkaline matter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 52
- 239000002351 wastewater Substances 0.000 title claims abstract description 52
- 239000000126 substance Substances 0.000 title claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 239000007800 oxidant agent Substances 0.000 claims abstract description 19
- 230000001590 oxidative effect Effects 0.000 claims abstract description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000000292 calcium oxide Substances 0.000 claims abstract description 7
- SRRKNRDXURUMPP-UHFFFAOYSA-N sodium disulfide Chemical compound [Na+].[Na+].[S-][S-] SRRKNRDXURUMPP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000009713 electroplating Methods 0.000 abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011574 phosphorus Substances 0.000 abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- 229910001453 nickel ion Inorganic materials 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 19
- 238000004062 sedimentation Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 238000007747 plating Methods 0.000 description 11
- 230000003750 conditioning effect Effects 0.000 description 8
- 239000003814 drug Substances 0.000 description 8
- 239000010802 sludge Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical class O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C02F1/72—Treatment of water, waste water, or sewage by 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
- C02F1/66—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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of chemical nickel waste water treating agents, including alkaline matter and oxidant, it is characterised in that: the alkaline matter is NaOH, Na2CO3, one or more of CaO, the oxidant is H2O2Or/and Na2S2；Alkaline matter 70-90%, oxidant 10-30%, by weight percentage.The present invention is directed to chemical nickel waste water and handles, and realizes that nickel ion and phosphorus settle thoroughly completely, 3 discharge standard of GB21900_2008 " discharge standard for electroplating pollutants " table is fully achieved in water quality.
Description
Technical field
The invention belongs to field of industrial waste water treatment, more particularly to the processing of chemical nickel waste water.
Background technique
There is chemical nickel plating in current nearly all plating industrial district, and the waste water generated in chemical nickel plating is known as chemical nickel
Waste water, chemical nickel waste component is more complicated, comprising many kinds of substance such as hypophosphites, phosphite, additives, wherein in waste water
Complexing agent can in conjunction with nickel ion the more stable complexing small molecule of forming properties, cause nickel ion to be difficult to be formed with hydroxyl
Nickel hydroxide precipitate, and the total phosphorus content in waste water is very high, therefore chemical nickel wastewater treatment is difficult, and total nickel, total phosphorus are very
Difficulty reaches 3 discharge standard of GB21900_2008 " discharge standard for electroplating pollutants " table.
Existing handling principle be first with the oxidizing contact break such as sodium hypochlorite, then plus alkali and recapture agent reaction precipitating, most
PAC, PAM is added to react precipitating again again afterwards.Process flow is as shown in Figure 1.There are various problems demands to solve for it, and such as (1) is invested
Greatly, land occupation is more, and energy consumption is big；(2) process flow is long, and operational management difficulty is big, and labor intensity of workers is big, and operating cost is high；
(3) it is difficult to stable operation qualified discharge.
Summary of the invention
The present invention provides a kind of inorganic agent for chemical nickel waste water, realize that nickel ion and phosphorus settle thoroughly completely, water
3 discharge standard of GB21900_2008 " discharge standard for electroplating pollutants " table is fully achieved in matter.
The purpose of the present invention is what is realized by following measures:
A kind of chemical nickel waste water treating agent, including alkaline matter and oxidant, it is characterised in that: the alkaline matter is
NaOH、Na2CO3, one or more of CaO, the oxidant is H2O2Or/and Na2S2；Alkaline matter 70-90%, oxidant
10-30%, by weight percentage.
Preferably, above-mentioned alkaline matter is NaOH, CaO and Na of 3-5: 1-2: 1-2 mass percent2CO3, oxidant is
The H of 4-6: 1-2 mass percent2O2And Na2S2, alkaline matter 75-85%, oxidant 15-25%, by weight percentage
Meter.
The processing method of above-mentioned chemistry nickel waste water, comprising the following steps: chemical nickel waste water is added in the inorganic agent and is carried out
Contact break reaction is aoxidized, pH value 10-12 is controlled, aeration stirring is reacted 15-40 minutes, and reaction tank is entered back into, and flocculation aid, warp is added
Sedimentation basin, supernatant enter clear water reserviors, filtering emission；Sludge in sedimentation basin is squeezed, the filtrate after squeezing returns to conditioning tank, squeezes
Sludge afterwards carries out solid slag processing.
The processing method of above-mentioned chemistry nickel waste water, comprising the following steps: chemical nickle-plating wastewater is entered into oxidation through conditioning tank
Contact break reaction tank is added the chemical nickel waste water treating agent, is sufficiently stirred, until waste water in reaction tank pH value be 11, reaction
After 15 minutes, into reaction tank, polystyrene amide is added and helps solidifying, is precipitated subsequently into sedimentation basin, supernatant warp in sedimentation basin
Enter clear water collecting pit after nickel on-line monitoring is qualified, with outlet after acid readjustment pH value 6-9；Sludge in sedimentation basin is squeezed,
Filtrate after squeezing returns to conditioning tank, and the sludge after squeezing carries out solid slag processing.
Beneficial effect
1. chemical nickel waste water, in alkalinity, the present invention realizes nickel under the synergistic effect of appropriate alkaline matter and oxidant
Ion and phosphorus settle thoroughly completely, and 3 discharge standard of GB21900_2008 " discharge standard for electroplating pollutants " table is fully achieved in water quality,
And steady in a long-term up to standard, compliance rate is in 99.9% or more (3 standard of table: total nickel 0.1mg/l, total phosphorus 0.5mg/l).
2. raw material of the present invention is simple and easy to get, pulvis can be easily made, cost is 3.00 yuan/kg.
3. inorganic agent of the invention replaces oxidant, NaOH, recaptures agent, PAC etc.；It sinks using with two reaction tanks, one
Shallow lake pond replaces four reaction tanks of current technology, two sedimentation basin sedimentation nickel ions and phosphorus；Sedimentation is fast, is separated by solid-liquid separation, completely
Qualified discharge.
4. the present invention under conditions of water identical as current technology technical treatment, is saving land occupation, facility investment, labour
50% or more in terms of power and treatment operating costs.Such as total nickel concentration 100mg/L, total phosphorus concentration in chemical nickel waste water
In the case where 120mg/L, current technology treatment operating costs 40-60 member/T, treatment operating costs 20-30 member/T of the present invention.
Detailed description of the invention
The existing process flow of Fig. 1 chemistry nickel waste water；
Fig. 2 present invention handles chemical nickel waste water process.
Specific embodiment
Referring to attached drawing, the present invention is specifically described below by embodiment, it is necessary to which indicated herein is following
Embodiment is served only for that invention is further explained, should not be understood as limiting the scope of the invention, this field
Technical staff can make some nonessential modifications and adaptations to the present invention according to aforementioned present invention content.
Embodiment 1
The great vertical electroplating wastewater processing station in Chongqing was put into operation in 2012, and treating capacity is 1000 ton/days.Due to being plastics electricity
Plating the inside is containing chemical nickel waste water, and chemical nickel waste water is 50 ton/days, the station chemical nickel influent waste water water quality are as follows: total nickel 80mg/L.
Just start using old technology, complex process long flow path (1 conditioning tank, 4 reaction tanks, a sedimentation basin), medicament
Type is more (5 kinds of medicaments), at high cost: chemical 20 yuan of reagent cost of the nickel waste water of one ton of processing, water, electricity, artificial, facilities and equipment etc. at
This 10 yuan, and the nickel index of wastewater treatment is unable to stably reaching standard.After my company's catcher operational management waste water station of in October, 2013,
It solves this problem using " TL chemical nickel waste water treating agent " of the invention and technology, simplifies process flow (1 tune
Save pond, 2 reaction tanks, 1 sedimentation basin), reduce medicament kind (2 kinds of medicaments), greatly reduces the construction cost of waste water station
And operating cost, one ton of chemical 8 yuan of reagent cost of nickel waste water, 7 yuan of costs of water, electricity, artificial, facilities and equipment etc. are handled, and handle
Compliance rate is in 99.9% or more (GB21900-2008 " discharge standard for electroplating pollutants " table 3) afterwards.
TL chemical nickel waste water treating agent: alkaline matter 80wt%, alkaline matter is according to 3: 1: 1 mass percents
NaOH, CaO and Na2CO3；Oxidant is 20wt%, the H of 3: 1 mass percent of oxidant2O2And Na2S2。
Treatment process: chemical nickle-plating wastewater is entered into oxidation contact break reaction tank through conditioning tank, is added " at TL chemistry nickel waste water
Manage agent ", it is sufficiently stirred, until the pH value of waste water in reaction tank is 11, after reaction 15 minutes, adds the poly- of a ten thousandth concentration
Third ethernamine PAM flocculation aid is precipitated subsequently into sedimentation basin, and supernatant enters clear after nickel on-line monitoring is qualified in sedimentation basin
Water collecting pit, with outlet after acid readjustment pH value 6-9；Sludge pressing in sedimentation basin, the filtrate after squeezing return chemical nickel waste water tune
Pond is saved, the sludge after squeezing carries out solid slag processing.
Embodiment 2
The present invention is applied in March, 2014, gradually expands and is applied to Chongqing fine jade pearl electroplating wastewater station, Chongqing perseverance section machinery system
Make four units such as Co., Ltd (plating industrial district), Chongqing intelligence human relations plating Co., Ltd (plating industrial district), day processing
Electroplating wastewater reaches 3800m3More than, it is detected through the multiple supervision of city, environmental protection administration, area, discharge beyond standards phenomenon never occurred, always
Nickel, total phosphorus are entirely capable of reaching 3 discharge standard of table, are greatly prized by thus.
Chongqing intelligence human relations electroplating wastewater processing station was put into operation in 2012, and treating capacity is 2000 ton/days.Due to being plating garden
Area's water quality is complicated, there is several chemical nickel plating production lines in garden, and chemical nickel waste water is 100 ton/days, the station chemical nickel influent waste water
Water quality are as follows: total nickel 100mg/L.Just start using old technology, complex process long flow path (1 conditioning tank, 4 reactions
Pond, a sedimentation basin), medicament kind is more (5 kinds of medicaments), at high cost: one ton of processing chemical 25 yuan of reagent cost of nickel waste water, water,
15 yuan of costs of electricity, artificial, facilities and equipment etc., and the nickel index of wastewater treatment is unable to stably reaching standard.My company of in October, 2013
After taking over operational management waste water station, solves this hardly possible using " TL chemical nickel waste water treating agent " of the invention and technology
Topic, simplifies process flow (1 conditioning tank, 2 reaction tanks, 1 sedimentation basin), reduces medicament kind (2 kinds of medicaments), significantly
The construction cost and operating cost for reducing waste water station, handle one ton of chemical 10 yuan of reagent cost of nickel waste water, water, electricity, it is artificial, set
Arrange it is 8 yuan of costs standby etc., and after handling compliance rate in 99.9% or more (GB21900-2008 " discharge standard for electroplating pollutants " table
3)。
TL chemical nickel waste water treating agent: NaOH, CaO and Na of 2: 1: 1 mass percent of alkaline matter2CO3, oxidant
It is the H of 4: 1 mass percents for oxidant2O2And Na2S2, alkaline matter 78%, oxidant 22%, by weight percentage
Meter.
Process: its chemical nickle-plating wastewater is entered into oxidation contact break reaction tank through conditioning tank, this example " TL chemical nickel is added
Waste water treating agent " is sufficiently stirred, until waste water in reaction tank pH value be 12, reaction 30 minutes after, add PAM flocculation aid,
It is precipitated subsequently into sedimentation basin, supernatant enters clear water collecting pit after nickel on-line monitoring is qualified in sedimentation basin, adjusts back PH with acid
Outlet after value 6-9；Sludge pressing in sedimentation basin, filtrate after squeezing return chemical nickel wastewater equalization pond, the sludge after squeezing into
Row disposition.
Table 1 GB21900_2008 " discharge standard for electroplating pollutants " table 3
Claims (2)
1. a kind of chemical nickel waste water treating agent, is made of alkaline matter and oxidant, it is characterised in that: the alkaline matter is
NaOH、Na2CO3And CaO, the oxidant are H2O2And Na2S2；Alkaline matter 70-90%, oxidant 10-30%, by weight percentage
Than meter.
2. chemical nickel waste water treating agent as described in claim 1, the alkaline matter is 3-5:1-2:1-2 mass percent
NaOH, CaO and Na2CO3, oxidant is the H of 4-6:1-2 mass percent2O2And Na2S2, alkaline matter 75-85%, oxidation
Agent is 15-25%, by weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610296684.3A CN105712465B (en) | 2016-05-06 | 2016-05-06 | A kind of chemical nickel waste water treating agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610296684.3A CN105712465B (en) | 2016-05-06 | 2016-05-06 | A kind of chemical nickel waste water treating agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105712465A CN105712465A (en) | 2016-06-29 |
| CN105712465B true CN105712465B (en) | 2019-03-26 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610296684.3A Expired - Fee Related CN105712465B (en) | 2016-05-06 | 2016-05-06 | A kind of chemical nickel waste water treating agent |
Country Status (1)
| Country | Link |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106115814A (en) * | 2016-08-03 | 2016-11-16 | 许祚员 | A kind of nickel sewage-treating agent and preparation method thereof |
| CN109607859A (en) * | 2018-12-21 | 2019-04-12 | 上海同济建设科技股份有限公司 | A kind of synthesis class pharmacy waste water complexing nickel treatment process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153217A (en) * | 2011-03-04 | 2011-08-17 | 漆雅丽 | Electroplating integrated wastewater treatment method |
| CN102167436A (en) * | 2011-03-04 | 2011-08-31 | 漆雅丽 | Electroplating wastewater treating agent |
| CN104086022A (en) * | 2014-06-27 | 2014-10-08 | 华南理工大学 | Treatment method of nickel-containing wastewater |
| CN104860438A (en) * | 2015-05-05 | 2015-08-26 | 广州维桢化工科技有限公司 | Processing method for industrial wastewater, preparation and application of preparation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52105573A (en) * | 1976-03-03 | 1977-09-05 | Ebara Infilco Co Ltd | Treatment of acid washing waste liquid |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153217A (en) * | 2011-03-04 | 2011-08-17 | 漆雅丽 | Electroplating integrated wastewater treatment method |
| CN102167436A (en) * | 2011-03-04 | 2011-08-31 | 漆雅丽 | Electroplating wastewater treating agent |
| CN104086022A (en) * | 2014-06-27 | 2014-10-08 | 华南理工大学 | Treatment method of nickel-containing wastewater |
| CN104860438A (en) * | 2015-05-05 | 2015-08-26 | 广州维桢化工科技有限公司 | Processing method for industrial wastewater, preparation and application of preparation |
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Granted publication date: 20190326 |