Method for removing arsenic by using Fe (II) and Mn (II) in underground water

A groundwater and determination method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problems of not considering the full utilization of composite oxidizing flocculants, high cost of chemicals, and difficulty in application , to achieve the effect of long-term stability of arsenic removal, easy operation and low operating cost.

Inactive Publication Date: 2012-07-18
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is more suitable for small-scale decentralized groundwater purification systems in rural areas, but it is difficult to apply to large-scale urban water plants.
In addition, this method does not consider the problem of full utilization of the composite oxidation flocculant, the cost of the agent is high, and it is not suitable for large-scale water plants.

Method used

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  • Method for removing arsenic by using Fe (II) and Mn (II) in underground water
  • Method for removing arsenic by using Fe (II) and Mn (II) in underground water
  • Method for removing arsenic by using Fe (II) and Mn (II) in underground water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the raw water has a turbidity of 2.1 NTU, contains 50 μg / L of As(III), contains 1.2 mg / L of Fe(II), and contains 0.65 mg / L of Mn(II). The filter unit used is a contact filter tank, and the backwash wastewater treatment unit used is a gravity hydrocyclone separator.

[0046] The composite agent added in the pipeline mixer is composed of 0.3mg / L potassium permanganate and 2mg / L ferric chloride, and the residence time of the arsenic-containing groundwater in the pipeline is 30 seconds after adding the medicine; Physical and chemical processes such as flocculation and adsorption. After that, enter the contact filter tank for filtration, wherein the upper layer of the filter bed is an anthracite filter layer with a thickness of 40cm (particle size 1-2mm), the middle layer is a quartz sand filter layer with a thickness of 80cm (particle size 0.6-0.9mm), and the lower layer is The supporting layer with a thickness of 100cm has a filtration rate of 7.5m / h; aft...

Embodiment 2

[0048] In this example, the raw water has a turbidity of 7.9 NTU, contains 30 μg / L of As(III), contains 2.31 mg / L of Fe(II), and contains 1.25 mg / L of Mn(II). The filter unit used is a contact filter tank, and the backwash wastewater treatment unit used is an ultrafiltration membrane reactor.

[0049] The composite agent added in the pipeline mixer is composed of 0.2mg / L potassium permanganate and 1mg / L ferric chloride, and the residence time of the arsenic-containing groundwater in the pipeline is 45 seconds after adding the medicine; Physical and chemical processes such as flocculation and adsorption. After that, enter the contact filter tank for filtration, wherein the upper layer of the effective filter layer is a porous coke filter layer (1.5-2 mm in particle size) with a thickness of 50 cm, and the lower layer is a manganese sand filter layer (0.6-0.9 mm in particle size) with a thickness of 100 cm. The filtration rate is 10m / h, and the arsenic-containing water undergoe...

Embodiment 3

[0051] In this example, the raw water has a turbidity of 2.3 NTU, contains 20 μg / L of As(III), contains 0.45 mg / L of Fe(II), and contains 0.21 mg / L of Mn(II). The filter unit used is a contact filter tank, and the backwash wastewater treatment unit used is an ultrafiltration membrane reactor.

[0052] The composite agent added in the pipeline mixer is composed of potassium permanganate of 0.042mg / L and ferric chloride of 1.16mg / L, and the residence time of the arsenic-containing groundwater in the pipeline is 30 seconds after the dosing; Physical and chemical processes such as microflocculation and adsorption. After that, enter the contact oxidation tank for filtration, wherein the upper layer of the effective filter layer is a porous coke filter layer (1.5-2 mm in particle size) with a thickness of 20 cm, and the lower layer is a quartz sand filter layer (0.6-0.9 mm in particle size) with a thickness of 100 cm. The filtration rate is 10m / h, and the arsenic-containing water u...

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Abstract

The invention discloses a method for treating underground arsenic water by using Fe (II) and Mn (II) coexisting with arsenic in underground water. The arsenic removing method comprises the steps of oxidation, micro-flocculation, contact filtration, backwashing water concentration, ferrimanganic particle FeMnOyHy and the like. In addition, an arsenic removing activity filter membrane with arsenic removing activity can be formed on the filter medium surface load of a contact filtration pond and can be used as another barrier for removing arsenic. The method is used for removing arsenic in a drinking water source, treatment water can reach the limit requirements (smaller than 10 mug/L) for arsenic in latest national Standards for Drinking Water Quality (GB5749-2006), and the indexes of ferrum, manganese, turbidity and the like can also reach the national standards. In addition, the method can be also used for removing heavy metals such as copper, chromium, cadmium, lead, antimony and the like and contaminants such as ferrum, manganese and the like in the drinking water source.

Description

technical field [0001] The invention relates to a method for treating groundwater containing arsenic, in particular to a method for treating groundwater containing arsenic by utilizing Fe(II) and Mn(II) coexisting with arsenic in the groundwater. Background technique [0002] Arsenic in natural water mainly exists in two forms: arsenate (As(V)) and arsenite (As(III)). For reducing groundwater, arsenic (III) is the main form. Compared with arsenic (V), arsenic (III) is more toxic, has poorer affinity to soil, sediment and metal oxides, and is more difficult to remove. At present, the relatively mature arsenic removal methods mainly include: sedimentation and co-sedimentation, coagulation, adsorption, ultrafiltration, ion exchange, etc. Among them, the oxidation of As(III) to As(V) is a necessary pretreatment process in most arsenic removal processes. The method for removing arsenic by using a composite oxidation flocculant composed of ferric chloride and potassium permangan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/76
Inventor 曲久辉吴鹍徐伟兰华春刘会娟巩文信刘锐平
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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