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Water treatment method for removing arsenic by strengthening zero-valent iron

A zero-valent iron and water treatment technology, applied in the directions of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of general removal effect, etc., to ensure the safety of water quality, simple operation and safe use. Effect

Active Publication Date: 2013-10-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption capacity of zero-valent iron for As(V) is strong, but the removal effect for As(III) is average

Method used

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  • Water treatment method for removing arsenic by strengthening zero-valent iron
  • Water treatment method for removing arsenic by strengthening zero-valent iron

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specific Embodiment approach 1

[0026] This embodiment "a water treatment method for strengthening zero-valent iron to remove arsenic" is carried out according to the following method: add persulfate and zero-valent iron to the water containing arsenic, so that the molar ratio of zero-valent iron and persulfate in the water is 1:1~10:1, the molar ratio of persulfate to arsenic is 5:1~100:1, then the mixed solution is stirred and reacted at a speed of 50~300 rpm for 5-60 min, and the As is completed by filtration. remove.

[0027] The water containing arsenic in this embodiment refers to groundwater or surface water containing one or more of As(III), As(IV) and organic arsenic. Persulfates are potassium persulfate (sodium, ammonium, calcium, magnesium), potassium monopersulfate (sodium, ammonium, calcium, magnesium). Zero-valent iron can be commercially available zero-valent iron, nanometer zero-valent iron or iron waste from processing plants, such as filings, chips, shavings and iron powder.

specific Embodiment approach 2

[0028] The difference between this embodiment and specific embodiment one is that in addition to adding persulfate, the synergistic agent of persulfate is added at the same time, and the synergistic agent of persulfate is (chlorination, nitric acid, sulfuric acid) ferrous / iron one or several. Others are the same as the first embodiment.

[0029] In this embodiment, the molar equivalent ratio of the dosage of the persulfate synergistic agent to the dosage of the persulfate is 0.1:1˜1:1.

specific Embodiment approach 3

[0030] The specific embodiment one "a water treatment method for strengthening zero-valent iron to remove arsenic" is carried out according to the following method: add persulfate to the water containing arsenic, and fully mix, so that the molar ratio of persulfate to arsenic is 5 :1~100:1, and then pass the mixed solution through a filter column with zero-valent iron as the main component, and after filtration, the enhanced removal of As is completed.

[0031] The water containing arsenic in this embodiment refers to groundwater or surface water containing one or more of As(III), As(IV) and organic arsenic. Persulfates are potassium persulfate (sodium, ammonium, calcium, magnesium), potassium monopersulfate (sodium, ammonium, calcium, magnesium). Zero-valent iron can be commercially available zero-valent iron, iron waste from processing plants, such as filings, chips, shavings, and iron powder.

[0032] figure 1 It is the diagram of the removal effect of As(III) in this spe...

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Abstract

The invention relates to a technology for removing and controlling arsenic which has very high toxicity in water, and discloses a water treatment method for removing arsenic by strengthening zero-valent iron, which can be used for groundwater repair, drinking water treatment, industrial arsenic-containing wastewater treatment, sewage deep treatment and integrated small-scale water treatment systems. The water treatment method specifically comprises the following steps of: adding persulfate and zero-valent iron into water containing arsenic, wherein the persulfate is added in a molar ratio of the persulfate to arsenic of (5:1)-(100:1), and the molar ratio of the zero-valent iron to the persulfate in the water is (1:1)-(10:1); and when the mixed solution is fully mixed, filtering or depositing to finish the removal of arsenic. The water treatment method is very simple to operate, easy to popularize and apply and safe to use, and can be used for ensuring the water quality safety.

Description

[0001] technical field [0002] The present invention relates to the removal and control technology of highly toxic arsenic in water, and more specifically, relates to a method that can be used for groundwater remediation, drinking water treatment, industrial arsenic-containing wastewater treatment, sewage advanced treatment, and the strengthening of integrated small water treatment systems Water treatment method for zero-valent iron removal of arsenic. Background technique [0003] Arsenic and arsenic compounds are typical "three causes" substances. Long-term drinking of high-arsenic water can cause blackfoot, neuralgia, blood vessel damage and increase the incidence of heart disease. In Xinjiang, Shanxi, Inner Mongolia, Jilin, Ningxia, Qinghai and more than a dozen provinces and autonomous regions in my country, arsenic poisoning in drinking water has been found, and the pollution situation is very serious. Among them, the arsenic pollution in groundwater is particularly s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/64
Inventor 方晶云仇荣亮陈建耀吴梓昊邹士倩
Owner SUN YAT SEN UNIV
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