title: [Effects of colloidal organic substrate on nitrification in biofilms].
abstract: The effects of colloidal and soluble organic substrates on nitrification in biofilms were investigated in biological aerated filters. The results showed that the hydrolysis process of colloidal organic matter took place rapidly, which could not be the limiting step of its oxidation in the biofilm. Some 70% organic matter oxidation was accomplished at the 40 cm at the bottom of the both filters, while the increase of organic matter in the influent resulted in the displacement of nitrification from the bottom to the upper part of filter bed. It was observed that the greater reduction on nitrification was caused by colloidal organic matter than by soluble organics at the same COD concentration.
authors.affiliation: State Kay Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Jiuyi
authors.initials: J
authors.lastname: Li
authors.forename: Zhaokun
authors.initials: Z
authors.lastname: Luan
authors.forename: Baoxia
authors.initials: B
authors.lastname: Zhu
authors.forename: Futai
authors.initials: F
authors.lastname: Chen
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Jia
mesh_terms: D018441:Biofilms; D019149:Bioreactors; D003102:Colloids; D005374:Filtration; D009584:Nitrogen / Q000302:isolation & purification*; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D003102:Colloids; D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen