Method used for treating high arsenic waste water

A waste water and solution technology, which is applied in the direction of precipitation treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of poor treatment effect and poor stability of high-arsenic wastewater, and achieve high arsenic removal rate and no secondary Less pollution, good stability

Active Publication Date: 2018-09-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this, it is necessary to provide a method for treating high-arsenic wastewater in view of the existing technical problems of poor stability or poor treatment effect in the treatment of high-arsenic wastewater

Method used

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  • Method used for treating high arsenic waste water
  • Method used for treating high arsenic waste water
  • Method used for treating high arsenic waste water

Examples

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Embodiment 1

[0026] This embodiment provides a method for mineral synergistic and stable treatment of high-arsenic wastewater, the specific process is as follows:

[0027] Arsenous acid, ferric nitrate and sodium sulfate were used as raw materials to prepare As 3+ Arsenic-containing solution with a concentration of 15g / L (calculated as arsenic), Fe 3+ Concentration of 16.8g / L iron salt solution and SO 4 2- The sulfate solution with a concentration of 4.8g / L is set aside; take 20ml respectively and mix well, then adjust the pH of the solution to 1.6 with NaOH. Pour this solution into a reaction kettle with a capacity of 100ml, put it into an oven, set the temperature at 165°C, and start timing when the temperature rises to the set temperature, react at this temperature for 8h, and cool naturally. The concentration of As in the supernatant was detected, and the removal rate of As was calculated to be 99.6%. At the same time, the mixed solution was vacuum-filtered with a 0.45 μm filter mem...

Embodiment 2

[0029] This embodiment provides a method for mineral synergistic and stable treatment of high-arsenic wastewater, the specific process is as follows:

[0030] Arsenous acid, ferric nitrate and sodium sulfate were used as raw materials to prepare As 3+ Arsenic-containing solution with a concentration of 15g / L (calculated as arsenic), Fe 3+ Concentration of 16.8g / L iron salt solution and SO 4 2- The sulfate solution with a concentration of 4.8g / L is set aside; after taking 20ml and mixing well, adjust the pH of the solution to 1.8. Pour this solution into a reaction kettle with a capacity of 100ml, put it into an oven, set the temperature at 165°C, and start timing when the temperature rises to the set temperature, react at this temperature for 8 hours, and cool naturally. The concentration of As in the supernatant was detected, and the removal rate of As was calculated to be 99.1%. At the same time, the mixed solution was vacuum-filtered with a 0.45 μm filter membrane and dr...

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Abstract

The invention relates to a method used for treating high arsenic waste water. The method comprises following steps: trivalent arsenic containing waste water to be treated, an iron salt solution, and asulfate solution are mixed to be uniform, the pH value of an obtained mixed solution is adjusted to 1.2 to 2.0, the mixed solution is introduced into a reaction vessel, reaction is carried out at 135to 200 DEG C so as to generate a precipitate, and the precipitate is removed, wherein the precipitate comprises scorodite and tooeleite minerals. The stability of the method is excellent; no secondary pollution is caused; arsenic removing rate is high at the synergism effect of scorodite and tooeleite minerals, and is as high as 89.8 to 99.6%; arsenic toxicity leaching concentration is as low as2.2 to 29.82mg / L.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating high-arsenic wastewater. Background technique [0002] Prevention and control of heavy metal pollution is one of the primary tasks of environmental protection in my country. According to statistics, in the non-ferrous smelting process, the polluted acid produced by the acid production process from smelting flue gas accounts for about 80% of the heavy metal wastewater in the factory. Due to the continuous mining of mineral resources, the grade of minerals gradually decreases, and the associated occurrence of various elements leads to the complexity of wastewater. Because it contains a large amount of acid, trivalent arsenic and other harmful elements, the pollutant composition is complex, the concentration is high and the toxicity is high, so it has become a difficult point to control. [0003] The treatment technologies for arsenic-containing ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F101/10C02F101/20
CPCC02F1/52C02F1/62C02F1/66C02F2001/007C02F2101/103C02F2101/20C02F2209/02C02F2209/06
Inventor 李青竹王庆伟张观石柴立元杨志辉闵小波梁彦杰刘恢
Owner CENT SOUTH UNIV
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