title: [Advanced nitrogen removal using innovative denitrification biofilter with sustained-release carbon source material].
abstract: An innovative denitrification biofilter was developed with polycaprolactone (PCL) as the carbon source and biofilm carrier. The performance of nitrogen removal was investigated with biologically treated effluent from secondary clarifier, and the results indicated that a maximum TN removal efficiency of 98.9% was achieved under the following conditions: influent total nitrogen (TN) concentration 30.0 mg x L(-1), denitrification load 54.0 mg (L x h)(-1), operating temperature 20. 1-22.0 degrees C, hydraulic retention time 0. 5 h; the total organic carbon (TOC) in effluent was 6.5-8.4 mg x L(-1), which was increased by 2.0-3.0 mg x L(-1) compared with that in the influent; the suspended solids (SS) concentration was less than 4.0 mg x L(-1) during operation; nearly 84.2% of the total released organic carbon which was used as electron donor in the denitrification process, was derived in the presence of microbes. The surface of the PCL pellets was observed by scanning electron microscope (SEM), it was shown that thick biofilm was formed on the surface of pellets, and the main microbial species were Bacillus and Trichobacteria.
authors.affiliation: School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China. tanglei.0312@163.com
authors.forename: Lei
authors.initials: L
authors.lastname: Tang
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Jian-e
authors.initials: JE
authors.lastname: Zuo
authors.forename: Lin
authors.initials: L
authors.lastname: Yuan
authors.forename: Zai-xing
authors.initials: ZX
authors.lastname: Li
mesh_terms: D001419:Bacteria / Q000378:metabolism; D018441:Biofilms; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry; D058440:Denitrification; D005374:Filtration / Q000379:methods*; D009584:Nitrogen / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*
chemical_list: D011091:Polyesters; C016240:polycaprolactone; D002244:Carbon; D009584:Nitrogen