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Treating process of underground water with high arsenic content

A treatment method and groundwater technology, applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as ineffective removal, reduce the amount of adsorbent, and reduce the number of regenerations , Improve the removal effect

Inactive Publication Date: 2004-06-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned treatment methods that cannot effectively remove As(III), thereby providing a process treatment method that combines oxidation of trivalent arsenic, removal of humus and adsorption of adsorbents to achieve low-cost purification of high-arsenic Purpose of underground drinking water

Method used

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  • Treating process of underground water with high arsenic content
  • Treating process of underground water with high arsenic content

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Embodiment

[0014] In this example, the high-arsenic groundwater containing high concentration of humus in Zhijiliang Township, Hohhot City, Inner Mongolia, my country was used for experiments. The raw water quality is: total arsenic is 1.2mg / L, pH is 7.5-7.8, of which trivalent arsenic accounts for 70%, pentavalent arsenic accounts for 30%, and total organic carbon TOC is 12.3mg / l. The water is injected into the ozone oxidation reaction device through the water inlet pump, and after staying for 30 minutes, it is degraded and adsorbed by the shell granular activated carbon treatment device, and finally, it is adsorbed by the adsorption tower equipped with rare earth iron oxide adsorbent. The experimental results are shown in Table 1, figure 2 Shown:

[0015] water quality

Total arsenic

trivalent arsenic

pentavalent arsenic

TOC

raw water

1.21

0.84

0.36

12.3

Oxidation

1.15

0.02

1.13

11...

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Abstract

The present invention is treating process and apparatus of underground water with high concentration of humic substance and high arsenic content. The treating process combines ozone oxidation to oxidize hard-to-treat three-valent arsenic into eary-to-treat five-valent arsenic and to oxidize humic substance into small molecular organic matter; degradation and adsorption of humic substance oxidizing product with bioactive carbon; and the final complete elimination of five-valent arsenic with efficient arsenic eliminating adsorbent. The said process has high arsenic eliminating effect and long adsorbent use life before regeneration, and can treat underground water with high concentration of humic substance and high arsenic content to reach safe drinking water standard at high efficiency and low cost.

Description

technical field [0001] The invention relates to a treatment method for high-arsenic groundwater containing high-concentration humus. Background technique [0002] Arsenic is carcinogenic, mutagenic, and teratogenic to animals. "Drinking Water Hygienic Standards" stipulates that arsenic concentration exceeding 0.05mg / L is classified as excessive drinking water. The content of trivalent arsenic in high-arsenic groundwater in my country is relatively high, and generally contains organic pollutants represented by humic substances. It is also difficult to remove, so the removal effect of arsenic is greatly reduced. [0003] At present, the commonly used methods for removing arsenic from drinking water at home and abroad include precipitation method and adsorption method. The precipitation method uses iron salt, aluminum salt, sulfide and lime to form insoluble compounds with arsenic to remove arsenic. The experimental results show that the arsenic removal effect of iron salt is...

Claims

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Application Information

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IPC IPC(8): C02FC02F1/58C02F9/04C02F9/14
Inventor 杨敏张昱王峰汪严明郭召海高迎新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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