Denitrification method and device based on electrochemical sulfate circulation

Abstract

The invention discloses a denitrification method and device based on electrochemical sulfate cycle. The device comprises an SANI system, a cathode chamber of MEC, an anode chamber of MEC and a power supply; the cathode chamber and the anode chamber are separated by a membrane; a cathode chamber and an anode chamber of the MEC are respectively connected with a negative electrode and a positive electrode of the power supply, and electrochemical sulfate reducing bacteria are enriched on a cathode electrode in the cathode chamber. The introduction of the MEC cathode chamber mainly has two effects:firstly, electrochemical sulfate reducing bacteria attached to the electrode are used for sulfate reduction; secondly, deep denitrification is carried out on negative bivalent sulfur generated by thecathode. The system not only retains the advantage of low sludge yield in the SANI process, but also can be applied to treatment of low-carbon, low-sulfate and high-concentration ammonia nitrogen wastewater.

Description

technical field [0001] The invention relates to a method and a device for treating low-carbon and low-sulfate ammonia-nitrogen wastewater based on an electrochemical sulfate cycle denitrification process, belonging to the fields of environmental technology and water treatment. Background technique [0002] Nowadays, the massive discharge of nitrogen-containing wastewater will greatly affect the balance of the ecosystem, especially in the water system. Representative examples are red tides caused by eutrophication of water bodies. The traditional biological nitrification and denitrification process has been widely used in ammonia treatment. Although some novel technologies, such as A / O technology, are constantly emerging, they have been used because of their advantages of low energy consumption and high efficiency. However, the traditional nitrification and denitrification technology requires additional dosing of alkalinity and electron donors, which increases the overall co...

AI Technical Summary

Problems solved by technology

However, for some industrial wastewater, such as petroleum wastewater, metallurgical wastewater, food industry wastewater, pharmaceutical wastewater, etc., the N concentration (ammonia concentration and nitrate concentration) is much higher than that of municipal wastewater. For these wastewater, if you simply use The SANI process is used for denitrification. First, the oxidation of high ammonia nitrogen will cause the pH of the nitrification chamber to be too low, which will affect the denitrification efficiency of the entire system. Second, due to the S / N requirements of the SANI system, a very high S concentration is required.

However, increasing the S concentration in the feed water in the SANI process has the following three disadvantages: First, the high concentration of sulfide is toxic to microorganisms

Third, higher S concentrations require more operating costs

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