title: Effect of sludge-fly ash ceramic particles (SFCP) on synthetic wastewater treatment in an A/O combined biological aerated filter.
abstract: Novel media-sludge-fly ash ceramic particles (SFCP) employed in an upflow lab-scale A/O BAF were investigated for synthetic wastewater treatment. The influences of hydraulic retention time (HRT), air-liquid ratio (A/L) and recirculation on the removals of chemical oxygen demand (CODcr), ammonia (NH(4)(+)-N) and total nitrogen (TN) were discussed. The optimum operation conditions were obtained as HRT of 2.0 h, A/L of 15:1 and 200% recirculation. Under the optimal conditions, 90% CODcr, more than 98% NH(3)-N and approximately 70% TN were removed. The average consumed volumetric loading rates for CODcr, NH(4)(+)-N and TN with 200% recirculation were 4.06, 0.36 and 0.29 kg(m(3)d)(-1), respectively. The CODcr and TN removal mainly occurred in the anoxic zone, while nitrification was completed at the height of 70 cm from the inlet of the bottom due to a suitable column layout of biological aerated filter (BAF). The characteristics of wastewater and backwashing affected TN removal to a large degree. In addition, the features of media (SFCP) and synthetic wastewater contributed to a strong buffer capacity in the BAF system so that the effluent pH at different media height fluctuated slightly and was insensitive to recirculation.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, China.
authors.forename: Shuxin
authors.initials: S
authors.lastname: Han
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Min
authors.initials: M
authors.lastname: Yue
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Zhao
authors.forename: Wenjing
authors.initials: W
authors.lastname: Cheng
mesh_terms: D001420:Bacteria, Aerobic / Q000378:metabolism; D002244:Carbon / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D060729:Coal Ash; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007220:Industrial Waste / Q000517:prevention & control*; D052638:Particulate Matter / Q000737:chemistry*; D012722:Sewage / Q000382:microbiology*; D014462:Ultrafiltration / Q000295:instrumentation* / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D060729:Coal Ash; D007220:Industrial Waste; D052638:Particulate Matter; D012722:Sewage; D014874:Water Pollutants, Chemical; D002244:Carbon