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Method for treating arsenic-containing waste water
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A treatment method and wastewater technology, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., to achieve low cost, no toxic gas, and less dosage
Inactive Publication Date: 2014-09-03
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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[0005] In view of the above defects, the present invention provides a treatment method for arsenic-containing wastewater with low cost, less dosage, simple operation, no secondary pollution, no toxic gas generation, and high arsenic removal rate, so as to solve many problems in the existing wastewater treatment technology. insufficient
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Embodiment 1
[0016] The method for treating arsenic-containing wastewater described in the embodiments of the present invention mainly consists of the following steps:
[0017] (1) First, add FeSO 4， The dosage is generally 4 times of the arsenic content in raw water;
[0018] (2) Then add sodiumhydroxide to adjust the pH value of the wastewater to 8.8, and use the generated colloidal Fe(OH) 3 It can adsorb ferric arsenate and ferric arsenite and co-precipitate; the reaction generated is as follows:
[0019] NaOH+FeSO 4 →Na 2 SO 4 +Fe(OH) 2 ;
[0020] NaOH+Fe 2 (SO 4 ) 3 →Na 2 SO 4 +Fe(OH) 3 ;
[0021] AsO 4 3- + Fe(OH) 3 →FeAsO 4 +3OH - ;
[0022] AsO 3 3- + Fe(OH) 3 →FeAsO 3 +3OH - ;
[0023] (3) Finally, add 2.5ppm anions and stir for 16 minutes, precipitate for 16 minutes, filter, and measure the arsenic content of the filtered water.
Embodiment 2
[0025] It mainly consists of the following steps:
[0026] (1) First, add FeSO 4， The dosage is generally 4 times of the arsenic content in raw water;
[0027] (2) Then add sodium hydroxide to adjust the pH value of the wastewater to 9.0, and use the generated colloidal Fe(OH) 3 It can adsorb ferric arsenate and ferric arsenite and co-precipitate; the reaction generated is as follows:
[0028] NaOH+FeSO 4 →Na 2 SO 4 +Fe(OH) 2 ;
[0029] NaOH+Fe 2 (SO 4 ) 3 →Na 2 SO 4 +Fe(OH) 3 ;
[0030] AsO 4 3- + Fe(OH) 3 →FeAsO 4 +3OH - ;
[0031] AsO 3 3- + Fe(OH) 3 →FeAsO 3 +3OH - ;
[0032] (3) Finally, add 0.5ppm anion and stir for 16 minutes, precipitate for 16 minutes, filter, and measure the arsenic content of the filtered water.
Embodiment 3
[0034] It mainly consists of the following steps:
[0035] (1) First, add FeSO 4， The dosage is generally 4 times of the arsenic content in raw water;
[0036] (2) Then add sodium hydroxide to adjust the pH value of the wastewater to 9.5, and use the generated colloidal Fe(OH) 3 It can adsorb ferric arsenate and ferric arsenite and co-precipitate; the reaction generated is as follows:
[0037] NaOH+FeSO 4 →Na 2 SO 4 +Fe(OH) 2 ;
[0038] NaOH+Fe 2 (SO 4 ) 3 →Na 2 SO 4 +Fe(OH) 3 ;
[0039] AsO 4 3- + Fe(OH) 3 →FeAsO 4 +3OH - ;
[0040] AsO 3 3- + Fe(OH) 3 →FeAsO 3 +3OH - ;
[0041] (3) Finally, add 5.0ppm of anion and stir for 16 minutes, precipitate for 16 minutes, filter, and measure the arsenic content of the filtered water.
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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 sodiumhydroxide 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 ferricarsenate and ferricarsenite; 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 sodiumhydroxide, the colloid Fe(OH)3 generated in reaction can adsorb the ferricarsenate 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 [0001] The invention relates to wastewater treatment technology, in particular to a treatment method for arsenic-containing wastewater. Background technique [0002] Water is a very finite natural resource and in many cases the quality of the water is not up to domestic or drinking standards. Many pollutants detected in water are harmful to human health and the environment, among which arsenic is considered as a priority pollutant; arsenic is found in rocks, soil, water, plants and animals, volcanic activity, rock erosion and forest Fires are all sources of arsenic, and human activities are also the main source of arsenic released into the environment, such as preservatives, paints, drugs, dyes, metals, and semiconductors. Burning of fossil dyes, mining, refining, and other industrial activities also contribute to the introduction of arsenic into the environment. [0003] With the development of metallurgy, chemical industry, petroleum and other industries ...
Claims
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Application Information
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