CN1148323C - Method of eliminating As, Pb, Cr and Hg from drinking water - Google Patents
Method of eliminating As, Pb, Cr and Hg from drinking water Download PDFInfo
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- CN1148323C CN1148323C CNB001312162A CN00131216A CN1148323C CN 1148323 C CN1148323 C CN 1148323C CN B001312162 A CNB001312162 A CN B001312162A CN 00131216 A CN00131216 A CN 00131216A CN 1148323 C CN1148323 C CN 1148323C
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- arsenic
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- drinking water
- ferrous
- cadmium
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Abstract
The present invention relates to a method for removing arsenic, lead, chromium, cadmium and mercury in living drinking water. Ferrous sulfate, NaOH for adjusting the pH value and bleaching essence or bleaching powder are respectively added in the living drinking water containing the five heavy metals. After the substances are added in the water, the bleaching essence can oxidize the five elements and a part of iron into a high valent state, hard dissolved hydroxide and hard dissolved precipitation are generated in the water and are absorbed by the hydroxide floccus of the iron, and then the hydroxide and the precipitation can precipitate together and can be removed via being filtered. The method of the present invention can effectively remove arsenic, lead, chromium, cadmium and mercury, so the contents of iron, arsenic, lead, chromium and cadmium are greatly lower than national standards.
Description
Technical field
The present invention relates to a kind of method of removing arsenic in the Drinking Water, lead, chromium, cadmium, mercury.
Background technology
Arsenic, lead, chromium, cadmium, mercury are that human body and animal capable are produced the toxic metal of huge murder by poisoning, are known as the five poisonous creatures: scorpion, viper, centipede, house lizard, toad in the environment.Owing to artifact pollution and the geological reason of the earth, some drinking water sources may contain wherein a kind of even several compositions, if surpassing the hygienic standard of national regulation, content will work the mischief, sometimes even can in the big area scope, cause disaster to numerous crowd to human body and animal health.For example Hunan in March, 2000 Chenzhou Ma Qiaocun owing to the artificial arsenic contamination that produces, makes hundreds of people's arsenic acute poisonings.And there is the arsenic of content up to 4ppm in Bangladesh owing to geological reason in the underground well water, makes 85,000,000 people arseniasis in various degree.And for example, famous itai-itai and minamata disease are respectively to drink due to the water that contains cadmium and mercury.
Announce the method for the poisonous metal element in a little removal Drinking Waters in the relevant document, announced the method for from pipe well water, removing arsenic with NaClO solution and molysite as the high chemical journal of India [1993,65 (1), the P30-31 page or leaf].The content that wherein adds molysite is 100-200 times of contained arsenic content in the water, and why the molysite dosage is so big, because of it does not consider the remarkably influenced that pH value of water forms arsenic salt precipitation, so have only with strengthening the purpose that the molysite amount reaches effective removal arsenic.Changchun applied chemistry institute has announced a kind of purifying method (number of patent application 85102296) of waste water containing arsenic, it is to add the molysite that is several times as much as the arsenic amount in waste water, under agitation add the ammoniacal liquor adjust pH to 8-9, add an amount of paper pulp again, continue to stir certain hour, elimination precipitates, and can reach the purpose of arsenic removal.Though it has noted adjust pH, its used remover is an ammoniacal liquor, and the stink that has ammoniacal liquor exists, and the pH value is 8-9, and obviously this method is not suitable for Drinking Water; In arsenic removal, do not adopt oxygenant in addition, so arsenic removal is not thorough.
Summary of the invention
The objective of the invention is at above-mentioned be only limited to dewater in the method for arsenic, and all there are certain insufficient practical situation in the method, aim to provide a kind of method of removing arsenic in the Drinking Water, lead, chromium, cadmium, mercury, adopt present method, can effectively remove arsenic, lead, chromium, cadmium in the water, make its content can be lower than related standards, the content of mercury reduces greatly.
The implementation of the object of the invention is, the method of the arsenic in the removal Drinking Water, lead, chromium, cadmium, mercury adds ferrous sulfate earlier while stirring in processed water, dosage is 12～15 times of five elements mole total amount, fully stir, have that arsenus acid is ferrous, the ferric arsenate precipitation.Add dilute NaOH solution again, adjust pH is till 7～8, fully stirs, and progressively generates the ferrous hydroxide floss.Add bleaching essence or chlorinated lime again, its dosage is can be ferric amount with the ferrous oxidation of the 60-70% in ferrous, bleaching essence or chlorinated lime also are oxidized to high price with the low price acid group of five elements, and generate the throw out and the ironic hydroxide floss of multiple indissoluble salt, the sedimentary floss of elimination band gets the Drinking Water that five elements content is less than the standard-required amount.
Molysite (comprising ferrous sulfate, iron trichloride, bodied ferric sulfate) is for a long time as water purification agent, but it is only as suspended substance and bacterium in the planar water, and to improve the sense organ form of water, as turbidity, colourity and microorganism etc., it is used for ultra's processing more.And the present invention adds ferrous sulfate in processed water, makes ferrous, the ferric arsenate precipitation of arsenical arsenic acid acid group generation arsenus acid in the water before this.
And then add rare NaOH solution, adjust pH is 7～8, fully stir, in stirring, progressively generate the floss of ferrous hydroxide, then add bleaching essence or chlorinated lime again, You Yijia bleaching essence is excellent, because of bleaching the available chlorine content height in the essence, so dosage is few accordingly, the calcium content of bleaching essence is few, it can combine with sulfate radical and form precipitation, makes the residual quantity in water little.
The ion of ferrous ion and five elements or acid group are under the effect of the smart Losantin of bleaching, by being oxidized to high price at a low price.70% Fe (OH) wherein
2Be oxidized to Fe (OH)
3Floss.The acid group of 5 kinds of elements is by being oxidized to high price at a low price, and acid group combines with metal ion, can form the mixed precipitation of following difficulty soluble salt.
Fe (OH)
2, Fe (OH)
3Have very huge specific surface area and have electric charge, thereby it has powerful absorption and co-precipitation performance.These two kinds of oxyhydroxide specific surface area difference in the different medium of potential of hydrogen is as being 100m in acidic solution
2/ g then can be up to 320m in basic solution
2/ g.The present invention regulates pH with rare NaOH, not only makes the specific surface area of oxyhydroxide of iron big, and adsorptivity is strong, and in regulate process, the oxyhydroxide of iron more makes its absorption property be not fully exerted through peracid, alkali two intervals.
The present invention adopts ferrous sulfate and bleaching smart, and adjust pH is 7-8, makes five elements in the water generate the precipitation of insoluble oxyhydroxide or difficulty soluble salt, and it is adsorbed and co-precipitation is got off that these are precipitated as the floss of iron, removes after filtering.
Embodiment
Enumerating one below adopts present method to remove the embodiment of the five elements in the tap water.Contain As, Pb, each 1000 μ g/L of Cr, Cd in the test water sample, Hg20 μ g/L.
Get above-mentioned water sample 10L, add FeSO earlier
47H
2O2g, effectively Cl content is 60% the smart 0.4g of bleaching, and concentration is 5% NaOH solution 12ml, and its removal effect sees the following form:
| Project | Opacity | pH | Vitriol (mg/L) | Iron (μ g/L) | Arsenic (μ g/L) | Plumbous (μ g/L) | Chromium (μ g/L) | Cadmium (μ g/L) | Mercury (μ g/L) |
| National standard | Be no more than 3 degree | 6.5-8.5 | 250 | 300 | 50 | 50 | 50 | 50 | 1 |
| The test water sample | Less than 3 degree | 7.0-8.0 | 110 | 230 | 2 | 4 | 26 | 2 | 1 |
As seen from the table, adopt the inventive method, can make the content of arsenic in the Drinking Water, lead, chromium, cadmium, mercury be significantly less than national standard, the content of mercury reduces greatly.
Claims (1)
1, remove the arsenic in the Drinking Water, plumbous, chromium, cadmium, the method of mercury, it is characterized in that in processed water, adding while stirring earlier ferrous sulfate, dosage is 12～15 times of five elements mole total amount, fully stir, there is arsenus acid ferrous, the ferric arsenate precipitation, add dilute NaOH solution again, adjust pH is till 7～8, fully stir, progressively generate ferrous hydroxide waddingization thing, add bleaching essence or chlorinated lime again, its dosage is for being ferric amount with the ferrous oxidation of 60-70%, and bleaching essence or chlorinated lime also are oxidized to high price with the low price acid group of five elements, and generates the throw out and the ironic hydroxide floss of multiple indissoluble salt, the sedimentary floss of elimination band gets the Drinking Water that five elements content is less than the standard-required amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001312162A CN1148323C (en) | 2000-12-05 | 2000-12-05 | Method of eliminating As, Pb, Cr and Hg from drinking water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001312162A CN1148323C (en) | 2000-12-05 | 2000-12-05 | Method of eliminating As, Pb, Cr and Hg from drinking water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1295031A CN1295031A (en) | 2001-05-16 |
| CN1148323C true CN1148323C (en) | 2004-05-05 |
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ID=4594559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001312162A Expired - Fee Related CN1148323C (en) | 2000-12-05 | 2000-12-05 | Method of eliminating As, Pb, Cr and Hg from drinking water |
Country Status (1)
| Country | Link |
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| CN (1) | CN1148323C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404085C (en) * | 2004-05-12 | 2008-07-23 | 上海洁申实业有限公司 | Harmless treatment method for arsenic contained rejectamenta |
| CN102642974B (en) * | 2012-05-07 | 2014-05-07 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| CN102874956B (en) * | 2012-11-02 | 2013-09-04 | 永兴鑫裕环保镍业有限公司 | Novel treatment process for mercurous industrial waste water |
| CN105110444A (en) * | 2015-08-11 | 2015-12-02 | 陈雷 | Method for purifying slightly polluted sewage by hydrochloric acid pickling waste liquor |
| CN105084590A (en) * | 2015-08-11 | 2015-11-25 | 陈雷 | Method for purifying slight pollution sewage through waste sulfuric acid picking liquid |
| CN110963612A (en) * | 2019-12-18 | 2020-04-07 | 上海勘察设计研究院(集团)有限公司 | Method for co-processing lead and arsenic composite pollutants in underground water by adopting pre-oxidation |
-
2000
- 2000-12-05 CN CNB001312162A patent/CN1148323C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1295031A (en) | 2001-05-16 |
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