Effect of N/S ratio on anoxic thiosulfate oxidation in a fluidized bed reactor: Experimental and artificial neural network model analysis

Long-term performance evaluation of an anoxic sulfur oxidizing moving bed biofilm reactor under nitrate limited conditions

“…6,17 -S L −1 ). 5,24 The higher K s observed at N/S ratios of 0.3 and 0.1 (Fig. 5) were clearly due to the cultivation under NO 3 − limitation.…”

“…The RTD test for the MBBR, at a theoretical HRT of 5 h, was performed on day 307 to determine the hydrodynamic behavior of the MBBR using the pulse input method as described by Khanongnuch et al 5 The procedure used to perform the RTD test and data analysis are described in Fogler. 20 The results obtained from the RTD test were used to determine the Peclet number (Pe r ) that describes the mixing characteristics of the MBBR as shown in eqn (5).…”

“…22 Elemental sulfur (S 0 ) was measured from K1 carriers collected on days 193, 240 and 300 using the modified cyanolysis method. 5…”

“…In a previous work, the response of a sulfur-oxidizing FBR biofilm was investigated under the same NO 3 − limited conditions as applied in this study. 5…”

“…) as the electron acceptor has gained increasing interest since reduced sulfur compounds and NO 3 − can be simultaneously removed from waste streams by a single anaerobic process. [3][4][5][6][7] The operation of anoxic sulfur-oxidizing bioreactors entails the use of a highly soluble electron acceptor (i.e. NO 3…”