Method for efficiently treating nitrogen-containing wastewater based on zero-valent iron coupled anaerobic ammonia oxidation

Abstract

The invention discloses a method for efficiently treating nitrogen-containing wastewater based on zero-valent iron coupled anaerobic ammonia oxidation. The method comprises the steps of feeding sludge into a reaction region of an up-flow type anaerobic reactor, and then feeding zero-valent iron, wherein the feeding amount of zero-valent iron is that 0.5-5 g of zero-valent iron is fed into each gram of sludge; feeding the wastewater to be treated from the bottom of the up-flow type anaerobic reactor through a peristaltic pump, so that the sewage to be treated can stay in the up-flow type anaerobic reactor for 24-96 hours, wherein the sludge concentration after the wastewater to be treated is fed is 2,000-7,000 mg / L, and after the up-flow type anaerobic reactor runs for 40-110 days, sludge anaerobic ammonia oxidation reaction is successfully started to realize efficient removal of nitrogen from the sewage. According to the method disclosed by the invention, the starting time of an anaerobic ammonia oxidation technology can be effectively shortened, and the total nitrogen removal rate of the anaerobic ammonia oxidation technology can be greatly increased; when the fed water total nitrogen volumetric loading is about 620N mg / L / d, nano-level zero-valent iron is fed, so that the starting time of an anaerobic ammonia oxidation technology can be shortened by 33.3 percent, and the total nitrogen removal rate can be increased by 2-19 percent.

Description

technical field [0001] The invention relates to a method for efficiently treating nitrogen-containing wastewater based on zero-valent iron coupled anaerobic ammonium oxidation, and belongs to the field of wastewater biological treatment. Background technique [0002] The anaerobic ammonium oxidation process is a new type of denitrification process that has been developed vigorously in recent years, especially suitable for the treatment of high ammonia nitrogen wastewater. This process means that under anaerobic or anoxic conditions, the anammox bacteria use nitrite nitrogen as the electron acceptor to directly convert ammonia nitrogen into nitrogen gas, thereby avoiding the participation of organic carbon sources and oxygen, and reducing the cost of denitrification It is greatly reduced, only 1 / 10 of the traditional technical method. Reaction formula: [0003] NH 4 + +1.32NO 2 - +0.06HCO 3 - +0.13H + →1.02N 2 +0.26NO 3 - +0.066CH 2 o 0.5 N 0.15 +2.03H 2 O (1)...

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Problems solved by technology

[0004] However, the doubling time of anammox bacteria is as long as 11 days, and the growth is slow, which seriously limits the industrial development of the anammox process, making this technology basically in the stage of laboratory theoretical research and less industrial application.

At the same time, subject to the production of medium nitrate nitrogen in this process, the theoretical total nitrogen removal rate of the anammox process is difficult to reach 90%. It is difficult for the indicators to meet the first-level standard for pollutant discharge of urban sewage treatment plants (GB18918-2002)

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