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Electrode bio-membrane reactor capable of synchronously removing nitrate and hexavalent chromium

A biofilm reactor and reactor technology, which is applied in electrochemical biocombination treatment, biological treatment device, biological water/sewage treatment, etc., can solve the problem of high operation cost and maintenance cost of ion exchange method, and limit the contact between pollutants and microorganisms. With mixing, membrane separation method membrane is easily contaminated and other problems, to achieve the effect of large biofouling capacity, easy operation and maintenance, and reduce secondary pollution

Inactive Publication Date: 2016-11-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Current groundwater nitrate and hexavalent chromium removal methods and technical defects include: 1) The ion exchange method has high operating and maintenance costs; 2) The membrane in the membrane separation method is easily polluted, and the post-operation treatment effect is unstable; 3) The chemical The precipitation method has high cost and produces secondary pollution; 4) the biological method has the specific characteristics of fast removal rate, simple method and low cost.
The current biological treatment technology is mostly aimed at the removal of nitrate or chromium alone, without considering the combined pollution of nitrate and hexavalent chromium in groundwater and the interaction of the two substances in the biochemical reaction
At present, all electrode biofilm reactors use plate-type fixed electrodes, which limits the contact and mixing of pollutants and microorganisms.
Although the nitrate removal effect in CN104787977A patent is better, it divides the electrode biofilm reactor into cathode chamber, anode chamber and adsorption chamber, and the structure of the reactor is complex
Some electrode biofilm reactors have poor air tightness and cannot provide an anoxic environment conducive to denitrification, which has great defects

Method used

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  • Electrode bio-membrane reactor capable of synchronously removing nitrate and hexavalent chromium
  • Electrode bio-membrane reactor capable of synchronously removing nitrate and hexavalent chromium
  • Electrode bio-membrane reactor capable of synchronously removing nitrate and hexavalent chromium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The reactor of the present invention is used.

[0048] The concentration of nitrate in artificial water is 50mg / L, and methanol is added as organic carbon source to control C / N to 0.7, pH to 7, and HRT to 8 hours. When the current intensity I is 0, 20, and 50mA, the denitrification effect of the reaction system is the best when the current I=50mA, and neither nitrate nor nitrite is detected in the effluent. When the microcurrent is controlled at 50mA, the dosage of carbon source is gradually reduced, and the C / N is 0.5, which can still have a good nitrate removal effect, but nitrite has begun to accumulate.

[0049]

Embodiment 2

[0051] The reactor of the present invention is used.

[0052] The concentration of hexavalent chromium in the artificially distributed water is 1.0 mg / L, the added organic carbon source (methanol) is 30 mg / L, the pH is 7, and the HRT is 8 hours. When the microcurrent I is 0, 20, 50, 100, and 200mA, when the current intensity is 50mA, the removal effect of Cr(VI) concentration in the reactor effluent is the best, and the removal rate of Cr(VI) reaches more than 95%. After stable operation The removal rate of Cr(VI) can reach 100%.

[0053]

Embodiment 3

[0055] The reactor of the present invention is used.

[0056] The concentration of nitrate in the artificially distributed water is 50mg / L, the concentration of hexavalent chromium in the influent is 1.0mg / L, methanol is added as the organic carbon source to control the reaction system C / N to 0.8, and a buffer solution is added to keep the pH of the influent at about 7. The residence time HRT is 8 hours.

[0057] When the microcurrent I is 0, 20, 50, 100, and 200mA, the effect of synchronous removal of nitrate and chromium salt compound pollution matrix is ​​worse than that of the reactor alone. However, when the current intensity is 50mA, the treatment effect of the reactor is still better, and the removal effect of Cr(VI) and nitrate in the effluent is the best. At the same time, there is no obvious accumulation of nitrite. The removal rates all reached more than 90%.

[0058]

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Abstract

The invention discloses an electrode bio-membrane reactor capable of synchronously removing nitrate and hexavalent chromium in water. The electrode bio-membrane reactor comprises a cylindrical reactor body; the bottom of a cylindrical water collector is arranged in an internal fixed block; small holes are formed in the wall of the lower part of the cylindrical water collector; the bottom of a cathode material ring is arranged between the internal fixed block and a middle fixed block; the bottom of an anode material ring is arranged between an external fixed block and the inner surface of the reactor; a water bath jacket is arranged on the outer part of the cylindrical reactor body; a circular plate is arranged on the upper part between the water bath jacket 1 and the cylindrical reactor body; the upper end of the water bath jacket is connected with a cover body in a sealing manner; biological carriers are arranged in the small holes in the surface of the cylindrical water collector movably; and biological carriers are arranged between the cathode material ring and the anode material ring. The reactor can promote the contact between pollutants and microorganisms. The cost is low, and secondary pollution is reduced. The electrode bio-membrane reactor has a simple structure, is convenient to operate and easy to run and maintain. The electrode bio-membrane reactor can synchronously and efficiently remove composite pollution nitrate and hexavalent chromium.

Description

technical field [0001] The invention relates to a ground water treatment device. More specifically, it relates to an electrode biofilm reactor for simultaneous removal of nitrate and hexavalent chromium. Background technique [0002] With the development of economy and society, the shortage of water resources has become a common challenge faced by the whole world. Groundwater resources maintain nearly 70% of my country's population for drinking and 40% of farmland irrigation. Various pollutants in groundwater will cause direct harm to human beings. . Long-term drinking of water with excessive nitrate and nitrite can cause degenerative hemochromatosis and increase the incidence of liver cancer, esophageal cancer, and gastric cancer. Chromium pollution in groundwater has serious effects on animals, plants and human health, and has teratogenic, carcinogenic and mutagenic effects. [0003] In recent years, the concentration of nitrate in groundwater has increased due to the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/28C02F101/16C02F101/22C02F103/06
CPCC02F3/005C02F3/2853C02F3/2866C02F2203/006C02F2103/06C02F2101/22C02F2101/163
Inventor 赵迎新翟思媛季民
Owner TIANJIN UNIV
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