CN104591438B - A kind for the treatment of process of hydrazine-containing water - Google Patents
A kind for the treatment of process of hydrazine-containing water Download PDFInfo
- Publication number
- CN104591438B CN104591438B CN201510015683.2A CN201510015683A CN104591438B CN 104591438 B CN104591438 B CN 104591438B CN 201510015683 A CN201510015683 A CN 201510015683A CN 104591438 B CN104591438 B CN 104591438B
- Authority
- CN
- China
- Prior art keywords
- hydrazine
- containing water
- solution
- sulfate
- aqueous solution
- Prior art date
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/16—Hydrazine; Salts thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention discloses a kind for the treatment of process of hydrazine-containing water, in hydrazine-containing water, namely add the aqueous sulfuric acid that mass percent concentration is 30%, is to stir under 100 ~ 150r/min and hydrazine carries out neutralization reaction, obtains hydrazine sulfate liquor with rotating speed; Then gained hydrazine sulfate liquor is adopted the hydrazine sulfate solution of nanofiltration separation aqueous solution and high density, and then carry out neutralization reaction by adding sodium hydroxide in the hydrazine sulfate solution of gained high density, the pH value of solution is made to control 7.5 ~ 8.0, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of gained hydrazine and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine.Aqueous sodium persulfate solution is obtained solid sodium sulfate through evaporation concentration, is separated the aqueous solution recycling of the hydrazine obtained.Treatment process of the present invention makes the hydrazine in hydrazine-containing water and water recycle respectively, and namely achieving turns waste into wealth, and reduces environmental pollution.
Description
Technical field
The present invention relates to a kind for the treatment of process of hydrazine-containing water.
Technical background
Nanofiltration is a kind of membrane separation technique between ultrafiltration and reverse osmosis, its molecular weight cut-off is in the scope of 80-1000, therefore, water (molecular weight of water the is 18) material much bigger with molecular weight ratio water can be passed easily through film and be separated through nanofiltration.Molecular weight because of hydrazine is 32, if hydrazine discord sulfuric acid salify, hydrazine just can not retain by tunicle well, it is the same as with water film, hydrazine can be retained well to make film, make hydrazine and sulfuric acid reaction make hydrazine vitriol, the molecular weight of hydrazine vitriol is 130, and such hydrazine vitriol is just retained by nanofiltration membrane easily and leaves with moisture.Hydrazine is basic cpd, with in sulfuric acid and salify time, solution system must slant acidity, without free hydrazine in such guarantee solution system, otherwise free hydrazine together with water through film, can not get being separated, but the acidity of solution can not be too strong, the acid work-ing life that can shorten by force film.
Hydrazine, as a kind of important fine chemical material, is mainly used in synthesizing whipping agent; For the anticorrosive additive of recirculated water in heat power plant and nuclear power plant; Also for the oxygen scavenger of water in Industrial Boiler and high pressure steam stove.Hydrazine except the dissolved oxygen in anhydrating, therefore, can use hydrazine can remove the residual minim dissolved oxygen produced in oiler feed, prevents the generation of iron dirt and copper dirt in boiler tube wall.In the recirculated water of power plant and nuclear power plant, the content of hydrazine is generally at 300 ~ 400ppm, and because the toxicity of hydrazine is comparatively large, higher to the index request of its discharge, the COD entering the hydrazine-containing water of water body can not more than 5ppm.
At present, to the method for hydrazine process, mostly use flocculation sedimentation, through its COD of hydrazine-containing water of this method process generally at 30 ~ 50ppm, do not reach emission request far away.
Summary of the invention
The object of the invention is to solve its COD after above-mentioned hydrazine-containing water process is still 30-50ppm, do not reach the technical problems such as emission request far away and a kind for the treatment of process of simple hydrazine-containing water is efficiently provided, COD in water body after this disposal methods is 0.005ppm, and, the water obtained after process and hydrazine can be recycled, accomplish few discharge or without discharge, its technique be simple, facility investment and processing cost low.
Know-why of the present invention
In hydrazine-containing water, add the aqueous sulfuric acid of 30%, stir and make hydrazine and sulfuric acid fully mix neutralization generation hydrazine vitriol.The pH value of the hydrazine-containing water after salify controls, at 5-6, then to go out pure water through nanofiltration separation, and because the molecular weight ratio water of sulfuric acid and hydrazine vitriol is much bigger, so water easily can pass through nanofiltration membrane, and the large compound of molecular weight just not easily passs through nanofiltration membrane is trapped.The object that hydrazine and sulfuric acid reaction generate hydrazine vitriol is exactly the molecular weight increasing hydrazine, molecular weight more large more not easily together with water by nanofiltration membrane, so with sulfuric acid and hydrazine salify ratio hydrochloric acid and hydrazine salify more easily separated.The vitriol of hydrazine obtains concentrated after nanofiltration membrane, after being concentrated into finite concentration, (the concentration high nanofiltration membrane of salt easily blocks, at present, more advanced nanofiltration can make isolate be concentrated into about 12%), concentrated hydrazine sulfate liquor, neutralize with sodium hydroxide, make hydrazine dissociate, then, then go out hydrazine through nanofiltration separation, following examples simulate in nuclear power boiler containing hydrazine water, be separated with nanofiltration.Nanofiltration separation concentrates the hydrazine vitriol obtained, less owing to measuring, and hydrazine vitriol repeatedly can be focused in test.
Technical scheme of the present invention
A kind for the treatment of process of hydrazine-containing water, namely first by hydrazine-containing water through acidifying salify and after the pH value controlling hydrazine-containing water is 5-6, hydrazine vitriol and the aqueous solution is isolated by nanofiltration or membrane filtration, then the neutralization of the hydrazine vitriol sodium hydroxide of gained is obtained free hydrazine and sodium sulfate, hydrazine and sodium sulfate is gone out again through nanofiltration separation, thus realize the process of hydrazine-containing water, specifically comprise the steps:
(1), in hydrazine-containing water, add the aqueous sulfuric acid that mass percent concentration is 30%, with rotating speed be under 100 ~ 150r/min stirs and hydrazine carries out neutralization reaction 30 ~ 60min, obtains hydrazine sulfate liquor;
Mass percent concentration is the consumption of the aqueous sulfuric acid of 30%, after the hydrazine in pressing and in hydrazine-containing water, makes the pH value of hydrazine-containing water system control to be as the criterion at 5-6;
(2), by the hydrazine sulfate liquor of step (1) gained adopt nanofiltration separation aqueous solution, obtain the hydrazine sulfate solution of high density;
(3), in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of solution is made to control 7.5 ~ 8.0, obtain the aqueous solution of hydrazine and sodium sulfate, by this solution again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water;
By the aqueous sodium persulfate solution of gained through evaporation concentration, obtain solid sodium sulfate, and be separated the aqueous solution recycling obtaining hydrazine.
After above-mentioned separation, the hydrazine of gained and pure water can reuses, thus the hydrazine in hydrazine-containing water and water are recycled respectively, and namely achieving turns waste into wealth, and reduces environmental pollution.
Beneficial effect of the present invention
Nanofiltration process (membrane filtration technique of sea water desaltination) can make the water (molecular weight 18) of molecular weight by film, and the sodium-chlor that molecular weight is larger (molecular weight 58.5) tunicle retains.The treatment process of a kind of hydrazine-containing water of the present invention, hydrazine (molecular weight 32) less for original molecule amount is increased molecular weight by becoming hydrazonium sulfate (molecular weight 130) with sulfuric acid reaction, then, nanofiltration process (membrane filtration technique of sea water desaltination) is adopted to be retained with the form tunicle of sulfuric acid hydrazonium salt by hydrazine, water by film, thus reaches the efficient process of hydrazine-containing water.The molecular weight of compound is larger, and easier tunicle retains, and therefore, after adopting the treatment process of hydrazine-containing water of the present invention to process, in water body, hydrazine content is extremely low, and COD is less than 0.005ppm by analysis, is less than 5ppm far below the emission standard COD of hydrazine-containing water.
Further, the treatment process of a kind of hydrazine-containing water of the present invention, the water obtained after process and hydrazine can be recycled, and accomplish few discharge or without discharge, environmental protection, and its treatment process is simple, facility investment and processing cost low.
Embodiment
Below by specific embodiment, the present invention is set forth further, but do not limit the present invention.
embodiment 1
A treatment process for hydrazine-containing water, specifically comprises the steps:
(1), at mass percent concentration be 0.04% 1000Kg hydrazine-containing water in add the aqueous sulfuric acid that mass percent concentration is 30%, controlling rotating speed is carry out neutralization reaction 30 ~ 60min under 100 ~ 150r/min, obtain hydrazine sulfate liquor, make the pH value of system be 5-6;
(2), by the hydrazine sulfate liquor of step (1) gained adopt nanofiltration separation aqueous solution, the COD of the aqueous solution is 0.005ppm after testing, obtains the hydrazine sulfate solution of 20Kg high density simultaneously;
(3), in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of neutralizer is made to be 7.5 ~ 8, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of this hydrazine and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water;
By aqueous sodium persulfate solution through evaporation concentration, obtain solid sodium sulfate, and be separated the recyclable recycling of the aqueous solution obtaining hydrazine.
comparative examples 1
A treatment process for hydrazine-containing water, specifically comprises the steps:
(1), at mass percent concentration be 0.04% 1000Kg hydrazine-containing water in add the aqueous sulfuric acid that mass percent concentration is 30%, controlling rotating speed is carry out neutralization reaction 30 ~ 60min under 100 ~ 150r/min, obtain hydrazine sulfate liquor, make the pH value of system be 6-6.5;
(2), by the hydrazine sulfate liquor of step (1) gained adopt nanofiltration separation aqueous solution, aqueous solution COD is 2 ~ 5ppm after testing, obtains the hydrazine sulfate solution of 20Kg high density simultaneously;
(3), in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of neutralizer is made to be 7.8 ~ 8, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of this hydrazine and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water;
By aqueous sodium persulfate solution through evaporation concentration, obtain solid sodium sulfate, and be separated the recyclable recycling of the aqueous solution obtaining hydrazine.
comparative examples 2
A treatment process for hydrazine-containing water, specifically comprises the steps:
(1), at mass percent concentration be 0.04% 1000Kg hydrazine-containing water in add the aqueous sulfuric acid that mass percent concentration is 30%, controlling rotating speed is carry out neutralization reaction 30 ~ 60min under 100 ~ 150r/min, obtain hydrazine sulfate liquor, the pH value of system is 6.5 ~ 7.0;
(2), by the hydrazine sulfate liquor of step (1) gained adopt nanofiltration separation aqueous solution, the COD of the aqueous solution is 15 ~ 25ppm after testing, obtains the hydrazine sulfate solution of 20Kg high density simultaneously;
(3), in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of neutralizer is made to be 7.5 ~ 8.0, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of this hydrazine and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water;
By aqueous sodium persulfate solution again through evaporation concentration, obtain solid sodium sulfate;
And be separated the recyclable recycling of the aqueous solution obtaining hydrazine.
comparative examples 3
A treatment process for hydrazine-containing water, specifically comprises the steps:
(1), at mass percent concentration be 0.04% 1000Kg hydrazine-containing water in add the aqueous sulfuric acid that mass percent concentration is 30%, controlling rotating speed is carry out neutralization reaction 30 ~ 60min under 200 ~ 300r/min, obtain hydrazine sulfate liquor, the pH value of system is 7.0 ~ 7.5;
(2), by the hydrazine sulfate liquor of step (1) gained adopt nanofiltration separation aqueous solution, the COD of the aqueous solution is 35 ~ 50ppm after testing, obtains the hydrazine sulfate solution of 20Kg high density simultaneously;
(3), in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of neutralizer is made to be 7.5 ~ 8.0, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of this hydrazine and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water;
By aqueous sodium persulfate solution through evaporation concentration, obtain solid sodium sulfate;
And be separated the recyclable recycling of the aqueous solution obtaining hydrazine.
The result of above-described embodiment 1 and comparative examples 1-3 is contrasted, result shows, with in sulfuric acid and hydrazine-containing water time, the pH value as system is greater than 6.5, through the water that nanofiltration obtains, its COD is greater than 5ppm, do not reach emission standard, reason has part hydrazine not have and the abundant salify of sulfuric acid, and dissociate in aqueous, because its molecular weight passes through film, so the water COD that nanofiltration obtains is higher together with water.In order to ensure that COD is less than 5ppm, with in sulfuric acid and time, the pH value of system controls 5 ~ 6.
The above is only the citing of embodiments of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Claims (1)
1. the treatment process of a hydrazine-containing water, first by hydrazine-containing water through acidifying salify and after the pH value controlling hydrazine-containing water is 5-6, hydrazine vitriol and the aqueous solution is isolated by nanofiltration or membrane filtration, then the neutralization of the hydrazine vitriol sodium hydroxide of gained is obtained free hydrazine and sodium sulfate, go out hydrazine and sodium sulfate through nanofiltration separation again, thus realize the process of hydrazine-containing water; It is characterized in that specifically comprising the steps:
(1) in hydrazine-containing water, add the aqueous sulfuric acid that mass percent concentration is 30%, with rotating speed be under 100 ~ 150r/min stirs and hydrazine carries out neutralization reaction 30 ~ 60min, obtains hydrazine sulfate liquor; Mass percent concentration is the consumption of the aqueous sulfuric acid of 30%, after the hydrazine in pressing and in hydrazine-containing water, makes the pH value of hydrazine-containing water system control to be as the criterion at 5-6;
(2) the hydrazine sulfate liquor of step (1) gained is adopted nanofiltration separation aqueous solution, obtain the hydrazine sulfate solution of high density;
(3) in the hydrazine sulfate solution of the high density of step (2) gained, add sodium hydroxide and carry out neutralization reaction, the pH value of solution is made to control 7.5 ~ 8.0, obtain the aqueous solution of hydrazine and sodium sulfate, by the aqueous solution of the hydrazine of gained and sodium sulfate again through nanofiltration separation, obtain the aqueous solution and the aqueous sodium persulfate solution of hydrazine, thus complete the separation of hydrazine in hydrazine-containing water; By the aqueous sodium persulfate solution of gained through evaporation concentration, obtain solid sodium sulfate; The aqueous solution recycling of the hydrazine obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510015683.2A CN104591438B (en) | 2015-01-13 | 2015-01-13 | A kind for the treatment of process of hydrazine-containing water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510015683.2A CN104591438B (en) | 2015-01-13 | 2015-01-13 | A kind for the treatment of process of hydrazine-containing water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104591438A CN104591438A (en) | 2015-05-06 |
| CN104591438B true CN104591438B (en) | 2016-04-27 |
Family
ID=53117554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510015683.2A Expired - Fee Related CN104591438B (en) | 2015-01-13 | 2015-01-13 | A kind for the treatment of process of hydrazine-containing water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104591438B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108862217A (en) * | 2018-07-09 | 2018-11-23 | 郭秦 | A kind of thiocarbohydrazide production wastewater treatment process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590311A (en) * | 2003-10-28 | 2005-03-09 | 第二炮兵工程学院对外技术服务部 | Treatment method of hydrazin containing waste water |
| WO2014209019A1 (en) * | 2013-06-25 | 2014-12-31 | Samsung Electronics Co., Ltd. | Organic/inorganic hybrid compound for fouling resistance, membrane for fouling resistance, and method of preparing fouling resistant membrane |
-
2015
- 2015-01-13 CN CN201510015683.2A patent/CN104591438B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590311A (en) * | 2003-10-28 | 2005-03-09 | 第二炮兵工程学院对外技术服务部 | Treatment method of hydrazin containing waste water |
| WO2014209019A1 (en) * | 2013-06-25 | 2014-12-31 | Samsung Electronics Co., Ltd. | Organic/inorganic hybrid compound for fouling resistance, membrane for fouling resistance, and method of preparing fouling resistant membrane |
Non-Patent Citations (3)
| Title |
|---|
| 从含肼废水中回收硫酸肼;黄大海;《化工环保》;19601231;第10卷(第4期);第234页1.工艺流程及图1 * |
| 含肼废水的净化和肼回收装置的研究;王煊军等;《含能材料》;20051231;第13卷(第6期);405-407 * |
| 含肼废水的处理方法;孙高年等;《黎明化工》;19911231(第2期);27-29 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104591438A (en) | 2015-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5873771B2 (en) | Organic wastewater treatment method and treatment apparatus | |
| US7198722B2 (en) | Process for pre-treating and desalinating sea water | |
| CN111484178B (en) | Comprehensive treatment method for seawater or strong brine | |
| CN101659457B (en) | Recovering and treating method for treating biochemical tail water resin desorption liquid | |
| US20130168314A1 (en) | Method for Treating Wastewater Containing Copper Complex | |
| CN107265734B (en) | Reverse osmosis concentrated seawater treatment system and method | |
| CN115135938A (en) | System and method for direct extraction of lithium from geothermal brine and production of low carbon strength lithium chemicals | |
| US20230159346A1 (en) | Facile, low-energy routes for the production of hydrated calcium and magnesium salts from alkaline industrial wastes | |
| CN107814449A (en) | A kind of processing method of brine waste | |
| CN110877945A (en) | Treatment method of high-salt high-organic matter industrial wastewater | |
| JP2017114705A (en) | Method for producing sodium hypochlorite, and sodium hypochlorite production device | |
| CN101979350A (en) | Physical and chemical sludge recycling and reducing method | |
| CN113461236A (en) | Zero discharge system that high salt waste water of power plant divides matter to handle | |
| US20160340216A1 (en) | Method for removing boron from boron-containing waste water | |
| CN109133459A (en) | A kind of desulfurization wastewater recycling processing method | |
| CN104591438B (en) | A kind for the treatment of process of hydrazine-containing water | |
| JP2014144435A (en) | Treatment apparatus of salt-containing wastewater | |
| CN105481202A (en) | Stainless steel pickling wastewater treatment system and method | |
| CN105967396A (en) | Method for treating manganese-containing wastewater | |
| CN109485189A (en) | Ca in high concentration chaff interferent waste water2+And SO42-Intermediate processing | |
| CN104030510A (en) | Method for recycling acid and heavy metal in gold smelting acid wastewater | |
| CN107601729B (en) | Strong salt wastewater zero-discharge treatment process and system for steel industry | |
| CN103420520B (en) | Processing method of vanadium-containing aluminum-containing wastewater | |
| CN105293747A (en) | Method for treating EDTA chemical cleaning wastewater | |
| CN212504419U (en) | Resourceful harmless treatment system of mixed salt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160427 Termination date: 20190113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |