Process schematic
Ammonia-nitrogen wastewater pollution has attracted increasing attention, and the country has included it in the “12th Five-Year Plan†binding emission index. In the traditional ammonia nitrogen wastewater (especially low C / N ammonia nitrogen wastewater) treatment process, additional organic carbon (such as formate, acetate, etc.) needs to be added to achieve complete denitrification, which not only increases the cost of treatment, And it is easy to cause secondary pollution of organic matter. In order to overcome this shortcoming, for the denitrification of ammonia nitrogen wastewater with low C / N in recent years, the scientific community has proposed some improved treatment processes, such as anaerobic ammonia oxidation (ANAMMOX), short-range nitrification and denitrification (SHARON), based on Autotrophic denitrification process (CANON), oxygen-limited autotrophic nitrification and denitrification (OLAND), electrode biofilm denitrification, etc. These processes have their own advantages, but there are more or less unfavorable factors such as slow start-up, harsh operating conditions and large energy consumption.
The Li Daping research group of the Microbiology Center, Chengdu Institute of Biology, Chinese Academy of Sciences has long been engaged in the research of ammonia nitrogen wastewater. Combining the principle of biological denitrification and bioelectrochemical methods, a new set of ammonia nitrogen wastewater autotrophic denitrification technology has been developed. This technology achieves complete denitrification of ammonia-nitrogen wastewater without organic carbon by coupling ammonia oxidation and denitrification in a low-voltage bioelectrochemical system. This technology has the advantages of simple process, fast start-up and low energy consumption, and provides new technical support for the complete autotrophic denitrification of low-C / N ammonia nitrogen wastewater.
Related research paper Autotrophic nitrogen removal from ammonium at low applied voltage in a single-compartment microbial electrolysis cell was published in Bioresource Technology.
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