Method for removing ammonia nitrogen from industrial waste water produced in synthetic ammonia industry

Abstract

The invention discloses a method for removing ammonia nitrogen from industrial waste water produced in a synthetic ammonia industry. The method provided by the invention comprises the following steps that industrial waste water produced in a synthetic ammonia industry orderly enters into an anoxic pond, an anaerobic pond, a micro-oxygen pond, an aerobic pond and a sedimentation pond; a part of the industrial waste water in the micro-oxygen pond flows back to the anaerobic pond; a part of the industrial waste water in the aerobic pond flows back to the anoxic pond; and a part of the industrial waste water in the sedimentation pond flows back to a water inlet end of the anoxic pond. The method provided by the invention realizes anoxic denitrification, anaerobic ammoxidation and short-cut nitrification and denitrification in the same biological treatment system. The method provided by the invention realizes the short-cut nitrification and denitrification and thus saving an oxygen supply amount by 25% and an organic carbon source utilization amount by 40% and reducing reaction retention time and the capacity. The method provided by the invention realizes the anaerobic ammoxidation and thus reducing energy consumption and preventing secondary pollution. The method provided by the invention has a high ammonia nitrogen removal rate of above 99%. The method provided by the invention has a low alkali consumption amount in the whole flow and has a low operating cost.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen in waste water, in particular to a method for removing ammonia nitrogen in synthetic ammonia industrial waste water. Background technique [0002] The synthetic ammonia industry produces a large amount of ammonia-nitrogen-containing industrial wastewater during the production process. The wastewater in this industry has the characteristics of many types of pollutants, poor biodegradability, low carbon-nitrogen ratio, and high ammonia-nitrogen content. At present, the synthetic ammonia industrial wastewater is generally treated by biochemical methods, especially the biological denitrification process represented by A / O denitrification. The principle of the process is that ammonia nitrogen in wastewater is nitrified into nitrate nitrogen by nitrifying bacteria under aerobic conditions, and a large amount of nitrate nitrogen flows back to the anoxic section. Under anoxic conditions, through t...

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Problems solved by technology

In the process, the aerobic section requires a large amount of blast air, large power consumption, and a large amount of alkali to be supplemented; the anoxic section needs to supplement a large amount of organic carbon sources. Under the condition of low carbon-nitrogen ratio of ammonia industrial wastewater, denitrification The rate is low, the amount of supplementary organic carbon source is large, and the operating cost is high; the denitrification efficiency of this process is low. In order to improve the denitrification rate, the reflux ratio must be increased, but the high reflux ratio will cause rich oxidation in the anoxic section, destroy the denitrification environment, and reduce Increased denitrification rate and increased kinetic energy consumption

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