Application of SNAD Process on Anaerobic Digester Liquor of Swine Wastewater Treatment

• Main Authors: Hung, Nien-Tzu, 洪念慈
• Other Authors: Lin, Jih-Gaw
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/39889981236665091476

碩士 === 國立交通大學 === 環境工程系所 === 102 === SNAD (Simultaneous partial Nitrification, Anammox and Denitrification) is an Anammox based process developed in 2009 to treat wastewater. SNAD is able to remove organic carbon along with nitrogen from wastewater as three microbial communities (Ammonium oxidizing bacteria, Anammox bacteria and denitrifiers) exist in this system. The aim of this research was to apply SNAD process on anaerobic digester liquor of swine wastewater (ADLSW) treatment, and investigate its performance. A lab scale 5 L sequencing batch reactor (SBR) was set up for the establishment of SNAD process to treat ADLSW under ambient temperature (15-30oC). The fluctuation of ADLSW quality (COD: 387±145 mg/L; TKN: 662±189 mg/L; NH4+-N: 519±134 mg/L; alkalinity: 3036±1036 mg/L as CaCO3) and ambient temperature led to unstable SNAD operation. The conversion ratio of Y(NO2-+ NO3-)/ NH4+ was calculated and discussed for improving performance in SBR-5. The adjustment of air flow rate would shift the favorable value of Y(NO2-+ NO3-)/ NH4+.. Fed batch feeding strategy was applied to have stable condition and overcome the negative effect of organic nitrogen. Under fed batch mode of feeding, steady state conditions were achieved in the SBR-5 at NLR and OLR of 155 g/m3 d and 153 g/m3 d, respectively between days 472 to 553. The total nitrogen and COD removal efficiencies were 74 and 73%, respectively in this phase. The results showed that presence of organic nitrogen in ADLSW, feeding strategy, dissolved oxygen (DO) and reactor temperature affected the SNAD process.