title: Degradation characteristics of secondary effluent of domestic wastewater by combined process of ozonation and biofiltration.
abstract: The performance of the combined process of ozonation and biofiltration was studied for treating the secondary effluent from sewage treatment plant. It was found that COD, NH(3)-N, and TOC were removed from 40-52, 10-19, and 9-13 mg/L in the raw water to 18-23, 0.5-1.5, and 7-8.5 mg/L in the effluent water (removal efficiency were 58, 89, and 25%, respectively), respectively, with an ozone dose of 10 mg/L (0.7-1.1 mg O(3)/(mg TOC) and 0.2-0.25 mg O(3)/(mg COD)), and contacting time of 4 min. Under the operation conditions, ozonation enhanced the biodegradability of the organics in the secondary effluent, as illustrated by increasing biodegradable dissolved organic carbon (BDOC) value from 0.8-1.1 mg/L in the raw water to the 2.0-2.7 mg/L in the effluent water. Meanwhile, the percentage of the organics with molecular size less than 1k Da in the secondary effluent increased from 52.9 to 72.6%. The experimental results supported the expectation that the combined process of O(3)/Biofiltration might enhance the overall treatment efficiency of secondary effluent treatment.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. wshutao@yahoo.com.cn
authors.forename: Shutao
authors.initials: S
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.forename: Baicang
authors.initials: B
authors.lastname: Liu
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Jiang
authors.forename: Haiyang
authors.initials: H
authors.lastname: Zhang
mesh_terms: D001673:Biodegradation, Environmental; D018441:Biofilms / Q000254:growth & development; D018533:Biomass; D002681:China; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D010126:Ozone; D012722:Sewage / Q000032:analysis* / Q000382:microbiology; D013053:Spectrophotometry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014876:Water Pollution / Q000032:analysis / Q000517:prevention & control*; D014881:Water Supply
chemical_list: D012722:Sewage; D010126:Ozone