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Adsorption, aeration and nanofiltration combined technology for arsenic-containing water treatment and special device for technology

A combined process and special device technology, applied in the field of water treatment, can solve problems such as excessive arsenic content, achieve the effects of slowing down the process of membrane fouling, improving removal efficiency, and high retention efficiency

Inactive Publication Date: 2018-04-24
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, waterworks mainly remove excess arsenic in raw water through enhanced iron-salt coagulation process and calcium salt precipitation process. However, for residents in rural areas and remote mountainous areas, their drinking water often comes directly from groundwater or surface water, and these waters are often There is a problem of excessive arsenic content

Method used

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  • Adsorption, aeration and nanofiltration combined technology for arsenic-containing water treatment and special device for technology
  • Adsorption, aeration and nanofiltration combined technology for arsenic-containing water treatment and special device for technology
  • Adsorption, aeration and nanofiltration combined technology for arsenic-containing water treatment and special device for technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare 500L of arsenic-containing wastewater (the pH is 6.1, the total arsenic content is 1mg / L, the content of As(III) is 0.5mg / L, and the content of As(V) is 0.5mg / L), and it is discharged under the action of the water inlet pump. Enter the adsorption reaction tank, add goethite 1g / L to the adsorption reaction tank, turn on the aeration pump, adjust the aeration intensity to 0.2L / min, and aerate and stir for 30min. Turn on the outlet pump, its operating pressure is 0.1MPa, and the purified water passes through the membrane module and is discharged from the adsorption reactor. Collect the effluent, and use the hydride generation-atomic fluorescence (HG-AFS) method to detect the arsenic content in the effluent, which is less than 0.001mg / L. It is lower than the arsenic concentration limit (0.01mg / L) stipulated in the national "GB5749-2006 Sanitary Standard for Drinking Water". During continuous operation, the reading on the pressure gauge does not change.

Embodiment 2

[0044] Prepare 500L of arsenic-containing wastewater (the pH is 6.1, the total arsenic content is 1mg / L, the As(III) content is 0.5mg / L, and the As(V) content is 0.5mg / L), the arsenic content in Songhua River water is The background value is lower than 0.01mg / L, COD Cr It was 346mg / L, and the concentration of suspended particulate matter was 10.5mg / L. Under the action of the water inlet pump, it is discharged into the adsorption reaction tank, 1g / L of goethite is added to the adsorption reaction tank, the aeration pump is turned on, the aeration intensity is adjusted to 0.3L / min, and the aeration is stirred for 30min. Turn on the outlet pump, its operating pressure is 0.1MPa, and the purified water passes through the membrane module and is discharged from the adsorption reactor. Collect the effluent, and use the method of hydride generation-atomic fluorescence (HG-AFS) to detect the arsenic content in the effluent, which is lower than 0.001mg / L, which is lower than the nation...

Embodiment 3

[0046] Prepare 20L of arsenic-containing wastewater (the pH is 6.9, the total arsenic content is 0.1mg / L, the As(III) content is 0.05mg / L, and the As(V) content is 0.05mg / L), under the action of the water inlet pump Discharge into the adsorption reaction tank, add 0.5g / L hematite into the adsorption reaction tank, turn on the aeration pump, adjust the aeration intensity to 0.8L / min, and aerate and stir for 50min. Turn on the outlet pump, its operating pressure is 0.3MPa, and the purified water passes through the membrane module and is discharged from the adsorption reactor. The effluent was collected, and the arsenic content in the effluent was detected by the method of hydride generation-atomic fluorescence (HG-AFS). figure 2 As shown, when the filtration volume does not exceed 10L, the arsenic concentration in the effluent is lower than 0.001mg / L, which is lower than the arsenic concentration limit (0.01mg / L) stipulated in the national "GB5749-2006 Hygienic Standard for Dri...

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Abstract

The invention discloses an adsorption, aeration and nanofiltration combined technology for arsenic-containing water treatment and a special device for the technology. The technology comprises water quality adjustment, adsorption reaction, aeration oxidation and stirring and nanofiltration separation. The device comprises a raw water storage tank, a water inlet pump, an adsorption reaction tank, anaeration system, a nanofiltration separation system, a pressure gauge and a water outlet pump. Compared with the prior art, the technology has the advantages that oxidation of As (III) into As (V) can be accelerated in an aeration stirring manner, the removal efficiency of total arsenic can be improved, and aeration stirring can remarkably retard the membrane pollution process. The arsenic concentration of effluent treated with the device is lower than the arsenic concentration limit value (0.01 mg / L) specified in the national GB5749-2006 Domestic Drinking Water Health Standard.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an adsorption-aeration-nanofiltration combined purification method for removing arsenic pollutants in drinking water, groundwater or industrial waste water. Background technique [0002] Inorganic arsenic is a highly toxic substance. Arsenic trioxide is commonly known as "arsenic". Inorganic arsenic mainly exists in two forms: trivalent arsenic (As(III)) and pentavalent arsenic (As(V)). Excessive arsenic in water will pose a serious threat to human health and the ecological environment. Excessive amounts of arsenic are often detected in groundwater, drinking water, and industrial wastewater due to geological formations and the mining of arsenic-containing minerals. Excessive intake of arsenic in the human body can lead to serious neurological diseases and skin diseases, such as "blackfoot" and so on. How to remove excess arsenic in water has always been a hot spot in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10
CPCC02F1/281C02F1/442C02F1/66C02F1/72C02F9/00C02F2101/103
Inventor 郝林林王昶李桂菊贾青竹
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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