Research progress of integrated partial denitrification-anaerobic ammonia oxidation process

Abstract

Partial denitrification has a stable nitrite accumulation capacity,which holds the dawn to the application of anaerobic ammonia oxidation. Compared to the segmented partial denitrification-anaerobic ammonia oxidation(PD-A),the integrated PD-A is more compact and convenient in operation. In this paper, the nitrogen removal mechanism of partial denitrification and anaerobic ammonia oxidation was introduced initially. Then, the starting method and process form of integrated PD-A were elaborated from the suspended sludge, biofilm, granular sludge and cell immobilization system. It was found that the spatial structure of the integrated PD-A was not only conducive to the retention of functional bacteria but also beneficial to the development of derivative process. Subsequently, the factors that have effects on PD-A were summarized from the aspects of carbon source, influent water matrix, and pH, etc. The methods to enhance PD-A were introduced. Finally, the application progress of PD-A and its derivative processes was summarized, and the development direction was discussed. It was found that integrated PD-A had broad prospects in nitrogen removal and resource utilization of urban sewage, which met the development requirements of China’s “dual carbon”.

Keywords

• partial denitrification
• anaerobic ammonia oxidation
• integrated
• process application