Electrically enhanced ANAMMOX biologic nitrogen removal method

Abstract

The invention provides an electrically enhanced anaerobic ammonia oxidation reaction method belonging to the technical field of water treatment. The device comprises a cylindrical anaerobic ammonia oxidation reactor, two electrodes are arranged in the anaerobic ammonia oxidation reactor, a tubular iron electrode is used as an anode, a cylindrical graphite electrode is used as a cathode, and the electrodes are connected with an external DC stabilizing power supply through wires. The lengths of the electrodes are 30-40% of the effective height of the reactor, and the lowest inserting positions of the electrodes are 1 / 2 parts of the effective height of the reactor. Under the action of externally applied voltage (optimally, 0.6V voltage and less than 5mA current), the dissolution of iron in the anode is effectively controlled, and the growth of anaerobic ammonia oxidation bacteria is promoted. The results of experiment tests show that the nitrogen removal efficiency of the anaerobic ammonia oxidation bacteria is increased by electrochemical action and coupling in a biologic treatment process, the removal of nitrate nitrogen byproducts in the ANAMMOX process is enhanced, and the device has higher total nitrogen removal efficiency than reference reactors. The starting time of the ANAMMOX technology is shortened, and the total nitrogen removal capability of the ANAMMOX process is effectively improved.

Description

technical field [0001] The invention relates to environmental protection equipment, in particular to environmental protection equipment for water treatment. Background technique [0002] Anaerobic ammonium oxidation technology is a novel and efficient wastewater denitrification technology. Under anaerobic conditions, anammox bacteria use ammonia nitrogen as an electron donor to directly convert nitrite nitrogen into nitrogen gas to complete the denitrification process. Compared with the traditional denitrification process, it has the characteristics of low energy consumption, no additional carbon source, and less residual sludge output. This process not only has a good denitrification effect on general nitrogen-containing wastewater, but also has unique advantages in the treatment of wastewater with low carbon-to-nitrogen ratio and high ammonia nitrogen concentration (such as: anaerobic digestion solution, landfill leachate, etc.). Nevertheless, the application of anammox ...

AI Technical Summary

Problems solved by technology

However, different from the general anaerobic acid and methanogenic system that mainly removes organic matter, the main purpose of the anammox process is to remove ammonia nitrogen, and the process is a base-forming reaction. Ion release is somewhat limited

With the long-term operation of the reactor, microorganisms will attach to the iron surface, which may further affect the occurrence of zero-valent iron reaction and even cause the iron layer to be blocked

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