CN104016455A - Method for treating arsenic-containing waste water - Google Patents
Method for treating arsenic-containing waste water Download PDFInfo
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- CN104016455A CN104016455A CN201410190517.1A CN201410190517A CN104016455A CN 104016455 A CN104016455 A CN 104016455A CN 201410190517 A CN201410190517 A CN 201410190517A CN 104016455 A CN104016455 A CN 104016455A
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Abstract
The invention relates to a method for treating arsenic-containing waste water. The method comprises the following steps: (1) firstly adding FeSO4, wherein the dosage of the FeSO4 is four times more than the arsenic content of raw water; (2) then adding sodium hydroxide to regulate the pH value of the waste water to 8.8, and coprecipitating by utilizing the characteristic that generated colloid Fe(OH)3 can absorb ferric arsenate and ferric arsenite; and (3) finally adding negative ions of 2.5 ppm, stirring for 16 minutes, precipitating for 16 minutes, filtering, and measuring the arsenic content of filtered water. The method disclosed by the invention has the advantages that the pH of the waste water is regulated to 8.5-9.5 by firstly adding the FeSO4 and then adding the sodium hydroxide, the colloid Fe(OH)3 generated in reaction can adsorb the ferric arsenate and the ferric arsenite to realize coprecipitation, and finally the negative ions are added, sufficiently stirred, precipitated, filtered and detected. The method disclosed by the invention has the advantages of low cost, small dosage, easiness for operation, no secondary pollution, no toxic gas generation and high arsenic removal rate of 99.6%.
Description
Technical field
The present invention relates to wastewater processing technology, relate in particular to a kind for the treatment of process of arsenic-containing waste water.
Background technology
Water is very limited natural resources, and the quality of water does not reach the standard of domestic water or tap water in many cases.The many pollution substances that detect in water are all harmful to HUMAN HEALTH and environment, and wherein arsenic is considered to priority pollutant matter; Arsenic is all found in rock, soil, water, plant and animal body, volcanicity, rock corrosion and hill fire are all the sources of arsenic, mankind's activity is also that arsenic is discharged into the main source in environment, for example, in sanitas, paint, medicine, dyestuff, metal and semi-conductive production process, all can produce arsenic; The use of agricultural insecticide and fertilizer, the burning of fossil dyestuff, mining activities, refinement and other industrial activity are also the approach that causes arsenic entered environment.
Along with the exploitation of the industry developments such as metallurgy, chemical industry, oil and lean ore, arsenic follows principal element to be developed, and enters arsenic quantity in waste water quite large; The Center for Disease Control (CDC) and international cancer research institution (IARC) are defined as the first carcinogenic substance, comprise skin carcinoma, bladder cancer, lung cancer, vascular disease and Blackfoot Disease etc., all relevant with arsenic; High Concentration of Arsenic is extensively present in multiple countries and regions at the human health risk causing of surface water and groundwater (especially the latter).According to estimates, have every year in the world 110,000 t arsenic to enter by all means in hydrosphere, the safety and health of mankind's ecosystem of living in serious threat, and effective improvement of arsenic-containing waste water is very urgent.Therefore, the arsenic-containing waste water treatment technology of exploitation efficient economy, has great society, economy and environment meaning.
In the medicament of existing processing arsenic-containing waste water, generally to use the most conventional sodium sulphite to join in the waste water containing arsenic, make the arsenic in water be reduced precipitation, make to remove in this way the arsenic in waste water, consumption greatly, also likely makes water body darken, cause secondary pollution, can produce toxic gas, and cost performance is low.Thereby, need to effectively innovate prior art.
Summary of the invention
For above defect, the invention provides a kind of with low cost, consumption is few, simple to operate, non-secondary pollution, without the treatment process of the arsenic-containing waste water that toxic gas produces, arsenic removal efficiency is high, to solve many deficiencies of existing wastewater processing technology.
For achieving the above object, the present invention is by the following technical solutions:
A treatment process for arsenic-containing waste water, the steps include:
(1) first, first add FeSO
4,its chemical feeding quantity is 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 8.8, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated;
(3) last, add the negatively charged ion of 2.5ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
Described negatively charged ion value selects can be any one numerical value between 0.5-5ppm;
For step (2), add sodium hydroxide to regulate waste water ph to any one numerical value between 8.5-9.5;
For step (1), add FeSO
4chemical feeding quantity be at least 4 times of former water arsenic content.
The beneficial effect of the treatment process of arsenic-containing waste water of the present invention is: by first adding FeSO
4, repeated hydrogenation sodium oxide, regulates wastewater pH to 8.5-9.5, the colloid Fe (OH) generating in reaction
3can adsorb ferric arsenate and iron arsenite and coprecipitated, finally add negatively charged ion fully to stir, sedimentation and filtration detects, and the method is with low cost, consumption is few, simple to operate, non-secondary pollution, produce without toxic gas, and arsenic removal efficiency is up to 99.6%.
Embodiment
embodiment 1
The treatment process of the arsenic-containing waste water described in the embodiment of the present invention, is mainly made up of following steps:
(1) first, first add FeSO
4,its chemical feeding quantity is generally 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 8.8, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated; The reaction that wherein produced is as follows:
NaOH+FeSO
4→Na
2SO
4+Fe(OH)
2；
NaOH+Fe
2(SO
4)
3→Na
2SO
4+Fe(OH)
3；
AsO
4 3-+?Fe(OH)
3→FeAsO
4+3OH
-；
AsO
3 3-+?Fe(OH)
3→FeAsO
3+3OH
-；
(3) last, add the negatively charged ion of 2.5ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
embodiment 2
Mainly formed by following steps:
(1) first, first add FeSO
4,its chemical feeding quantity is generally 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 9.0, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated; The reaction that wherein produced is as follows:
NaOH+FeSO
4→Na
2SO
4+Fe(OH)
2；
NaOH+Fe
2(SO
4)
3→Na
2SO
4+Fe(OH)
3；
AsO
4 3-+?Fe(OH)
3→FeAsO
4+3OH
-；
AsO
3 3-+?Fe(OH)
3→FeAsO
3+3OH
-；
(3) last, add the negatively charged ion of 0.5ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
embodiment 3
Mainly formed by following steps:
(1) first, first add FeSO
4,its chemical feeding quantity is generally 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 9.5, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated; The reaction that wherein produced is as follows:
NaOH+FeSO
4→Na
2SO
4+Fe(OH)
2；
NaOH+Fe
2(SO
4)
3→Na
2SO
4+Fe(OH)
3；
AsO
4 3-+?Fe(OH)
3→FeAsO
4+3OH
-；
AsO
3 3-+?Fe(OH)
3→FeAsO
3+3OH
-；
(3) last, add the negatively charged ion of 5.0ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
embodiment 4
Mainly formed by following steps:
(1) first, first add FeSO
4,its chemical feeding quantity is generally 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 8.5, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated; The reaction that wherein produced is as follows:
NaOH+FeSO
4→Na
2SO
4+Fe(OH)
2；
NaOH+Fe
2(SO
4)
3→Na
2SO
4+Fe(OH)
3；
AsO
4 3-+?Fe(OH)
3→FeAsO
4+3OH
-；
AsO
3 3-+?Fe(OH)
3→FeAsO
3+3OH
-；
(3) last, add the negatively charged ion of 1.5ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
Above embodiment is more preferably embodiment several of the present invention, and the common variation that those skilled in the art carry out within the scope of the technical program and replacing should be included in protection scope of the present invention.
Claims (4)
1. a treatment process for arsenic-containing waste water, is characterized in that, the steps include:
(1) first, first add FeSO
4,its chemical feeding quantity is 4 times of former water arsenic content;
(2) add again sodium hydroxide to regulate waste water ph to 8.8, utilize the colloid Fe (OH) generating
3can adsorb ferric arsenate and iron arsenite and coprecipitated;
(3) last, add the negatively charged ion of 2.5ppm to stir 16 minutes, precipitate 16 minutes, filter, survey the arsenic content of water after filtering.
2. the treatment process of arsenic-containing waste water according to claim 1, is characterized in that: described negatively charged ion value selects can be any one numerical value between 0.5-5ppm.
3. the treatment process of arsenic-containing waste water according to claim 1, is characterized in that: for step (2), institute adds sodium hydroxide to regulate waste water ph to any one numerical value between 8.5-9.5.
4. the treatment process of arsenic-containing waste water according to claim 1, is characterized in that: for step (1), institute adds FeSO
4chemical feeding quantity be at least 4 times of former water arsenic content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410190517.1A CN104016455A (en) | 2014-05-08 | 2014-05-08 | Method for treating arsenic-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410190517.1A CN104016455A (en) | 2014-05-08 | 2014-05-08 | Method for treating arsenic-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104016455A true CN104016455A (en) | 2014-09-03 |
Family
ID=51433516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410190517.1A Pending CN104016455A (en) | 2014-05-08 | 2014-05-08 | Method for treating arsenic-containing waste water |
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|---|---|
| CN (1) | CN104016455A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609593A (en) * | 2014-12-16 | 2015-05-13 | 浙江工业大学 | Method for removing and recycling arsenic in water body by copper powder replacement |
| CN104860445A (en) * | 2015-06-03 | 2015-08-26 | 安徽新中远化工科技有限公司 | Method for treating arsenic-containing wastewater by using pyrite cinder |
| CN105084590A (en) * | 2015-08-11 | 2015-11-25 | 陈雷 | Method for purifying slight pollution sewage through waste sulfuric acid picking liquid |
| CN107008126A (en) * | 2017-04-27 | 2017-08-04 | 昆明理工大学 | It is a kind of while removing the method for reducing atmosphere sulfureous in flue gas hydrogen and heavy metal |
-
2014
- 2014-05-08 CN CN201410190517.1A patent/CN104016455A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609593A (en) * | 2014-12-16 | 2015-05-13 | 浙江工业大学 | Method for removing and recycling arsenic in water body by copper powder replacement |
| CN104609593B (en) * | 2014-12-16 | 2016-06-15 | 浙江工业大学 | Method for removing and recycling arsenic in water body by copper powder replacement |
| CN104860445A (en) * | 2015-06-03 | 2015-08-26 | 安徽新中远化工科技有限公司 | Method for treating arsenic-containing wastewater by using pyrite cinder |
| CN105084590A (en) * | 2015-08-11 | 2015-11-25 | 陈雷 | Method for purifying slight pollution sewage through waste sulfuric acid picking liquid |
| CN107008126A (en) * | 2017-04-27 | 2017-08-04 | 昆明理工大学 | It is a kind of while removing the method for reducing atmosphere sulfureous in flue gas hydrogen and heavy metal |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140903 |
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| WD01 | Invention patent application deemed withdrawn after publication |