title: Enhanced nitrogen removal in a wastewater treatment process characterized by carbon source manipulation with biological adsorption and sludge hydrolysis.
abstract: An innovative adsorption/nitrification/denitrification/sludge-hydrolysis wastewater treatment process (ENRS) characterized by carbon source manipulation with a biological adsorption unit and a sludge hydrolysis unit was developed to enhance nitrogen removal and reduce sludge production for municipal wastewater treatment. The system presented good performance in pollutants removal, yielding the effluent with average COD, NH(4)(+)-N, TN and TP of 48.5, 0.6, 13.2 and 1.0 mg/L, respectively. Sixty percent of the total carbon source in the influent was concentrated and separated by the quick adsorption of activated sludge, providing the possibilities of reusing waste carbon source in the denitrification tank and accumulating nitrobacteria in the nitrification tank. Low temperature of 6-15 °C and high hydraulic loading rate of 3.0-15.0 m(3)/d did not affect NH(4)(+)-N removal performance, yielding the NH(4)(+)-N of lower 1.0 mg/L in the effluent. Furthermore, 50% of the residual sludge in the ENRS system could be transformed into soluble COD (SCOD) by alkaline thermal hydrolysis with temperature of 60 °C and pH of 11, and the hydrolyzed carbon could completely substitute methanol as a good quality carbon to support high efficient denitrification.
authors.affiliation: ESPC State Key Joint Laboratory, Department of Environment Science and Engineering, Tsinghua University, Beijing 100084, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Liu
authors.forename: Fang
authors.initials: F
authors.lastname: Zhao
authors.forename: Boyang
authors.initials: B
authors.lastname: Mao
authors.forename: Xianghua
authors.initials: X
authors.lastname: Wen
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000302:isolation & purification / Q000378:metabolism*; D001420:Bacteria, Aerobic / Q000378:metabolism*; D002244:Carbon / Q000302:isolation & purification / Q000378:metabolism*; D006868:Hydrolysis; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D002244:Carbon; D000641:Ammonia; D009584:Nitrogen