Method combining oxidizing composite reagent and activated carbon to remove arsenic in water
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A technology of compounding agent and activated carbon is applied in the field of water treatment to achieve good removal effect, ensure water quality safety and facilitate management.
Inactive Publication Date: 2013-08-28
HARBIN ENG UNIV
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Although commercial activated carbon has been proven to have a very low ability to remove As(Ⅲ), it has a certain adsorption capacity for As(Ⅴ), and there are few research reports on the use of activated carbon to directly adsorb arsenic.
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specific Embodiment approach 1
[0028] Specific Embodiment 1: In this embodiment, the method for removing arsenic in water by the combination of new oxidizing compound agent and activated carbon is carried out in the following manner: add new oxidizing compound medicament to the water and stir, and after 10 minutes of contact oxidation, use activated carbon to adsorb again, which is completed Removal of arsenic in water; among them, the new oxidizing compound agent is composed of potassium ferrate, chlorine dioxide, sodium peroxide, potassium persulfate, potassium monopersulfate, ferrous sulfate, ferric sulfate, and hydroxylamine hydrochloride. The dosage of oxidizing compound agent The amount is added according to the molar equivalent ratio of arsenic in water to 5:1.
[0029] In this embodiment, sodium arsenite is added to certain surface water, and the initial total arsenic concentration is 50 μg / L, as the treated raw water. The removal effect of arsenic in water is shown in figure 1 . It can be seen th...
specific Embodiment approach 2
[0031] Specific Embodiment 2: The difference between this embodiment and Embodiment 1 is that in this embodiment, the arsenic-containing water is exposed to air or oxygen to ensure that the dissolved oxygen in the water is 4-40 mg / L, and the pH of the water body is controlled to be 6-9 .
specific Embodiment approach 3
[0032] Embodiment 3: The difference between this embodiment and Embodiment 1 is that a new type of oxidation compound agent and activated carbon are added to the water at the same time, and the stirring reaction is oxidized for 3 to 30 minutes to realize the removal of arsenic.
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Abstract
The invention provides a method combining an oxidizing composite reagent and activated carbon to remove arsenic in water. The oxidizing composite reagent is added into the water and stirred, and then the activated carbon is utilized to adsorb the arsenic. The oxidizing composite reagent is formed by compositing potassium ferrate, chlorine dioxide, sodium peroxide, potassium persulfate, potassium monopersulfate, ferrous sulfate, ferric sulfate and hydroxylamine hydrochloride, or is formed by compositing potassium peroxide, sodium peroxide, sodium monopersulfate, iron chloride and hydroxylaminehydrochloride, or is formed by compositing calcium peroxide, sodium hypochlorite, calcium monopersulfate, calcium persulfate, cerium chloride, ferric chloride, cerous sulfate and humus, or is formed by compositing cobalt chloride, ammonium monopersulfate, ammonium persulfate, cerous sulfate, sodium peroxide and hydroxylamine hydrochloride. The method can not only remove the arsenic in drinking water, underground water and surface water rapidly, efficiently, conveniently and safely, but also effectively reduce concentration of the arsenic in sewage containing arsenic and effluent of sewage secondary sedimentation tanks, and simultaneously can have good recovery effect on lakes and inland seawater polluted by the arsenic.
Description
technical field [0001] The invention relates to a water treatment method. Specifically, a method for removing arsenic from water. Background technique [0002] Arsenic is a toxic element that widely exists in nature. According to epidemiological surveys, arsenic compounds may cause human skin cancer, lung cancer, and bladder cancer, and have been recognized as carcinogens by authoritative organizations such as WHO and the US EPA. The research results also show that arsenic has a great correlation with certain diseases . With the intensification of natural differentiation and the mining and smelting of arsenic-containing ores and the large-scale application of arsenic-containing materials caused by more and more human activities, arsenic pollution in water has become a worldwide problem. Water bodies in some countries in Southeast Asia and many areas in my country, especially groundwater, have been seriously polluted by arsenic, which has caused many local arsenic poisonin...
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