| Title |
Nitritation of Anaerobic Digester Supernatant from Sludge Processing in MWTP |
| Keywords |
Anaerobic digester supernatant; Free ammonia; Nitritation; Recycle water; Solid retention time |
| Abstract |
The anaerobic digester supernatant (ADS) with high NH4-N concentration often results in a NH4-N overloading to the mainstream process of municipal wastewater treatment plant (MWTP). The nitrogen removal from the ADS is therefore important in order to achieve a stable mainstream process performance as well as to prevent NH4-N overloading due to ADS. Recently because of several advantages compared to the full nitrification, many works have shown interests in controlling the build-up of NO2-N in nitritation processes. The application of nitritation could save the aeration power compared to the full nitrification processes. In addition, the denitrification of NO2-N could reduce organic carbon requirements compared to the NO3-N denitrification. The purpose of this research was to find out the characteristics of the ADS nitritation and NO2-N accumulating factors from the laboratory reactor study. As a result based on the long-term laboratory experiment, it can be concluded that the degree of nitritation was closely related with the availability of alkalinity, free ammonia (FA), solid retention time (SRT) and solid concentration in the nitritation reactor. |