title: Treatment of phenolic wastewater in UASB reactor: effect of nitrogen and phosphorous.
abstract: Phenolic wastewater representing an industrial wastewater was supplemented with varying amount of nitrogen (N) and phosphorous (P) and treated in upflow anaerobic sludge blanket reactor (UASBR). The variation of COD:N:P from 300:10:1 to 300:1:0.1, did not influence the conversion of phenol COD to methane COD. The concentration of N and P in the influent was reduced from 25.5mgl(-1) to 2.5mgl(-1) and 2.5 to 0.25mgl(-1), respectively. However, on further reducing the nutrients in the feed from 300:1:0.1 to 300:0:0 the (i) CH(4)-COD decreased from 90% to 40%, and (ii) cell yield reduced to 25-50%. The average cell yield was 3.5%. Percent N and P in cells varied from 10% to 14% and 0.6% to 2.4%, respectively. The activity of the sludge assessed as specific methanogenic activity (SMA) was found in the range from 0.15 to 0.66g CH4-CODg(-1) VSSd(-1). The optimum COD:N:P for phenolic wastewater has been estimated to be 300:1:0.1.
authors.affiliation: Department of Civil Engineering, Indian Institute of Technology, Roorkee 247 667, India.
authors.forename: Athar
authors.initials: A
authors.lastname: Hussain
authors.forename: Pradeep
authors.initials: P
authors.lastname: Kumar
authors.forename: Indu
authors.initials: I
authors.lastname: Mehrotra
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D007700:Kinetics; D009584:Nitrogen / Q000737:chemistry*; D010100:Oxygen / Q000302:isolation & purification; D010636:Phenols / Q000302:isolation & purification*; D010758:Phosphorus / Q000737:chemistry*; D012722:Sewage; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D010636:Phenols; D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen