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Low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation

A synergistic oxidation and electrochemical technology, applied in the field of water pollution remediation, can solve the problems of high energy consumption of electrode reaction and high cost of pre-oxidation, and achieve the effect of saving system energy consumption and eliminating aeration links.

Active Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this new process described in this patented solution overcomes previous methods that use an oxidizing agent for removing mercury from wastewater or other liquids containing harmful metals such as lead (Pb). By replacing traditional ways involving bacteria-based treatment processes with gaseous diffusible reagents like nitrogen dioxide), these techniques save more than 250kW/tonne electrical power compared to existing technologies.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the ability to safely degraded arsenious metals such as arsenosulfur acid or arsenopyrite intoxic levels without increasing environmental concerns associated with conventional disposal techniques like landfill leaching. Current technologies involve expensive processes involving complex steps and materials requiring careful handling during waste management operations.

Method used

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  • Low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation
  • Low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation
  • Low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation

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Embodiment 1

[0051] The groundwater has a pH of 7, a conductivity of 1500 μs / cm, and an As(III) content of 500 μg / L. The air cathode-electroflocculation reactor is powered by a DC stabilized power supply (the schematic diagram of the reactor is shown in figure 2 ), fixed voltage 1V. Take 1 mL of water sample every 10 minutes, and measure As(III) and total arsenic changes after passing through a 45 μm water filter membrane, as shown in Figure 5 , 6 shown. The energy consumption of the air cathode-electrocoagulation system can be calculated by P=UIt, wherein the current I is the real-time record of the automatic data acquisition system, and t is the time when the total arsenic reaches 10 μg / L, such as Figure 9 shown.

Embodiment 2

[0053] The groundwater has a pH of 7, a conductivity of 1500 μs / cm, and an As(III) content of 500 μg / L. The air cathode-electroflocculation reactor is powered by a DC stabilized power supply (the schematic diagram of the reactor is shown in figure 2 ), fixed voltage 2V. Take 1 mL of water sample every 10 minutes, and measure As(III) and total arsenic changes after passing through a 45 μm water filter membrane, as shown in Figure 7 , 8 shown. The energy consumption of the air cathode-electrocoagulation system can be calculated by P=UIt, wherein the current I is the real-time record of the automatic data acquisition system, and t is the time when the total arsenic reaches 10 μg / L, such as Figure 9 shown.

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Abstract

The invention provides a low energy consumption device and method for removal of arsenic from water by electrochemistry coordinated oxidation-flocculation. The method employs a gas diffusion type air cathode to replace an iron cathode in common electric flocculation, utilizes the passive diffusion of oxygen in air to achieve in-situ formation of H2O2 on the surface of a catalyst layer, promotes the generation of active species (.OH and Fe(IV)), and rapidly oxidizes As(III) into As(V), anode generated metal ions (iron ions, aluminum ions or zinc ions) are hydrolyzed to generate a large number of flocs, and adsorption is carried out to remove As(V). Compared with traditional electric flocculation, the method not only can achieve efficient oxidation of As(III) and up-to-stand removal of total arsenic, also saves aeration energy consumption by about 200Wh.m<-3>, and reduces the electrode reaction energy consumption by 30-40%.

Description

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Claims

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Application Information

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Owner TSINGHUA UNIV
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