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Electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater

A technology of biological adsorption and hexavalent chromium, applied in electrochemical water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of long adsorption equilibrium time, slow adsorption rate, and low adsorption efficiency , to achieve the effect of fast speed, simple operation and high selectivity

Active Publication Date: 2013-01-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

Many studies have also reported that brown algae can be used as a biosorbent for removing Cr(VI), but it is also generally found that the adsorption rate of Cr(VI) on the brown algae adsorbent is very slow, and the time to reach adsorption equilibrium is very long. It takes 48 to 72 hours, or even longer, which greatly limits the use of this high-quality and cheap biosorbent in the treatment of wastewater containing hexavalent chromium
The present invention effectively combines electrochemical reduction and biological adsorption to construct a biological adsorption process assisted by electrochemical reduction, which solves the problem of low adsorption efficiency in the process of using brown algae alone, fully exerts the advantages of biological adsorption technology, and effectively removes At the same time of Cr(VI), it can also effectively remove the total Cr

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  • Electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater

Examples

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Embodiment 1

[0034] See figure 1 , an integrated reactor based on electrochemical reduction-assisted biological adsorption treatment of wastewater containing hexavalent chromium, including: cathode 2, anode 3, modified brown algae biosorbent 4, proton exchange membrane 5, stirring paddle 6, stirring motor 7 and DC power supply8.

[0035] A described proton exchange membrane 5 separates the container as the integrated reactor main body 1 into two parts, the cathode chamber and the anode chamber, wherein the cathode chamber is provided with the cathode 2 and the stirring motor 7 connected with the said stirring paddle 6, the said anode 3 is arranged in the anode chamber; connected.

[0036] A water outlet 10 equipped with a valve is provided on the container wall at the bottom of the cathode chamber, and a water inlet 9 equipped with a valve is provided on the container wall at the top of the water outlet, and at the bottom of the anode chamber A water outlet 12 equipped with a valve is a...

Embodiment 2

[0043] The integrated reactor for treating wastewater containing hexavalent chromium based on electrochemical reduction-assisted biosorption of Example 1 was used.

[0044] The modified brown algae biosorbent is modified Sargassum, and the modification method is: dry the Sargassum, grind and sieve, and then sieve the algae with a particle size of 500-800 μm. The grains were immersed in the formaldehyde solution with a mass concentration of 5g / L, the immersion time was 10 hours, and the solid-to-liquid ratio was 15g Sargassum grains / 1L water.

[0045] The surface pretreatment method of the titanium (Ti) plate substrate is the same as that in Example 1, and the pretreated titanium (Ti) plate substrate is immersed in the plating solution of metal gold to carry out the electrodeposition reaction. The preparation of the metal gold plating solution is to dissolve the metered gold soluble precursor compound in the hydrochloric acid solution, and the preparation concentration is 0.5mm...

Embodiment 3

[0049] The integrated reactor for treating wastewater containing hexavalent chromium based on electrochemical reduction-assisted biosorption of Example 1 was used.

[0050] The modified brown algae biosorbent is modified fucales, and the modification method is as follows: drying the fucales, grinding and sieving, and then sieving the obtained particle size to 500-800 μm The algae grains were immersed in the formaldehyde solution with a mass concentration of 1g / L, the immersion time was 40 hours, and the solid-to-liquid ratio was 5g fucus grains / 1L water.

[0051] The surface pretreatment method of the titanium (Ti) plate substrate is the same as in Example 1, and the pretreated titanium (Ti) plate substrate is immersed in the plating solution of ruthenium metal for electrodeposition reaction. The preparation of the plating solution of the ruthenium metal is to dissolve the metered soluble precursor compound of the ruthenium metal in the hydrochloric acid solution, and the prep...

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Abstract

The invention relates to an electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater by using the integrated reactor. A proton exchange membrane is used for separating a container as a main body of the integrated reactor into a cathode chamber and an anode chamber, wherein a cathode and a stirring paddle connected with a stirring motor are arranged in the cathode chamber, an anode is arranged in the anode chamber, the cathode and the anode are respectively connected with a DC (direct current) power supply outside the container, and a modified brown seaweed biological adsorbent is loaded in the cathode chamber. The integrated reactor is formed by adopting the technical scheme. The hexavalent chromium-containing wastewater is treated through an electrochemical reduction process and a biosorption process which are simultaneously completed in the same reactor, wherein the cathode and the anode which are used in the electrochemical reduction process are respectively immersed into the cathode chamber and the anode chamber, and the cathode chamber and the anode chamber are separated by adopting the proton exchange membrane. According to the invention, hexavalent chromium and total chromium can be synchronously removed effectively.

Description

technical field [0001] The invention belongs to the application field of water treatment technology, and particularly relates to an integrated reactor for treating wastewater containing hexavalent chromium based on electrochemical reduction-assisted biological adsorption, and a method for treating wastewater containing hexavalent chromium using the integrated reactor . Background technique [0002] Chromium salt is an important inorganic salt industrial product, widely used in electroplating, leather tanning, printing and dyeing, medicine, alloy manufacturing, wood preservation, gasoline purification, etc. During the production and application of chromium salts, a large amount of chromium-containing wastewater is produced, which poses a serious threat to the environment. Chromium in wastewater mainly exists in two forms: hexavalent (Cr(VI)) and trivalent (Cr(III)), among which hexavalent chromium is highly toxic and has carcinogenic and mutagenic effects on humans and other...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/46C02F1/62C02F101/22
Inventor 刘会娟侯一宁曲久辉赵旭
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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