Deammonification of municipal wastewater using fludized bed reactor with different HRTs

• Main Authors: Chiang, Yi-An, 江翌安
• Other Authors: Lin, Jih-Gaw
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/w5hswv

碩士 === 國立交通大學 === 環境工程系所 === 104 === In this research, low strength real wastewater was treated at different hydraulic retention time (HRTs) by a single fluidized bed reactor (FBR) which includes several chemical processes such as partial nitrification, anaerobic ammonia oxidation (Anammox) and denitrification technology (SNAD). The SNAD process is an innovative biotechnology for the replacement of the traditional nitrification followed by denitrification. One of the major advantage of the SNAD process is energy saving due to the fact that only less than half of influent ammonium is required to be converted into nitrite, thus reducing the operation cost by 60% for aeration purpose compared to the traditional nitrification. In addition, ammonium and nitrite will be converted to nitrogen gas by Anammox. The other merit of the SNAD process is that it could remove nitrogen compounds and organic matter in the same reactor. SNAD technology is a small footprint and can be employed in densely populated cities. Anammox technology was applied to treat high ammonia wastewater in the past. However in this study Anammox was used to treat low strength real wastewater in order to achieve efficient and economic results. In this study, two liters of FBR with carrier supports for biomass attachment, in order to treat nitrogen compounds and organic substances of the wastewater. Studies show that under the condition of 24 hours HRT without temperature controlling, the removal efficiency of NH4+-N and TN were 99% and 81%. When HRT reduce to 12 hours, there is no supply of NH4+-N for Anammox due to the insufficient time for conversion of organic nitrogen to NH4+-N thus decreasing the removal efficiency of TN to 70%. When HRT reduced to 6 hours and 3 hours, the removal efficiency of TN had decreased to 53% and 46%, however the average removal rate of NH4+-N still remain at 98%.