title: Kinetic analysis of phenol, thiocyanate and ammonia-nitrogen removals in an anaerobic-anoxic-aerobic moving bed bioreactor system.
abstract: A simulated wastewater containing phenol (2500 mg/L), thiocyanate and ammonia-nitrogen (500 mg/L) was treated in an anaerobic (R1)-anoxic (R2)-aerobic (R3) moving bed biofilm reactor system at different hydraulic retention time (HRT) intervals (total HRT 3-8 days, R1: 1.5-4 days; R2: 0.75-2 days and R3: 0.75-2 days) and feed thiocyanate (SCN(-)) concentrations (110-600 mg/L) to determine substrate removal kinetics. In R1, phenol and COD reduction and specific methanogenic activity were inhibited due to the increase of SCN(-) in feed. Bhatia et al. model having inbuilt provision of process inhibition described the kinetics of COD and phenol utilization with maximum utilization rates of 0.398 day(-1) and 0.486 day(-1), respectively. In R2 and R3 modified Stover-Kincannon model was suitable to describe substrate utilization. In R2 respective maximum SCN(-), phenol, COD and NO(3)(-)-N utilization rates were 0.23, 5.28, 37.7 and 11.82 g/L day, respectively. In aerobic reactor R3, COD, SCN(-) and NH(4)(+)-N removal rates were, respectively, 10.53, 1.89, and 2.17 g/L day. The minimum total HRT of three-stage system was recommended as 4 days.
authors.affiliation: Centre for Environment, Indian Institute of Technology Guwahati, Assam 781039, India.
authors.forename: Biju Prava
authors.initials: BP
authors.lastname: Sahariah
authors.forename: Saswati
authors.initials: S
authors.lastname: Chakraborty
mesh_terms: D000332:Aerobiosis; D000641:Ammonia / Q000378:metabolism*; D000693:Anaerobiosis; D019149:Bioreactors; D000860:Hypoxia; D007700:Kinetics; D019800:Phenol / Q000378:metabolism*; D013861:Thiocyanates / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods
chemical_list: D013861:Thiocyanates; D014874:Water Pollutants, Chemical; D019800:Phenol; D000641:Ammonia; C031760:thiocyanate