title: [Experimental study on the processes and mechanism of enhanced denitrification by addition zeolite in wastewater treatment].
abstract: Aim to enhance nitrogen removal from wastewater, addition zeolite to aeration tank was preformed. The result showed that addition of zeolite could improve the nitrification/denitrification efficiencies by comparing two phase experiment of 25 mg/L with blank and 25 mg/L with 50 mg/L, and the population of nitrifying bacteria in activated sludge increased obviously. When 25 mg/L zeolite was added into aeration tank, NH4(+) -N and TN removal increased 10% - 13% and 13% respectively, endogenous respiration rate of nitrification increased about 138%, and the population of nitrification bacteria increased about 2.2 folds. But the nitrogen removal and endogenous respiration rate of 50 mg/L enhanced indistinct comparing with 25 mg/L. These results indicated that NH4+ ion-exchange and accumulation to the interior/outer surfaces of zeolite, co-existence of aerobic and anoxic micro-environments were responsible for the enhanced denitrifying function.
authors.affiliation: Department of Environmental Science, East China Normal University, Shanghai 200062, China. 52050802003@student.ecnu.edu.cn
authors.forename: Xing-Chun
authors.initials: XC
authors.lastname: Dai
authors.forename: Min-Sheng
authors.initials: MS
authors.lastname: Huang
authors.forename: Ya-Tong
authors.initials: YT
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Xie
mesh_terms: D000327:Adsorption; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D009584:Nitrogen / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods; D017641:Zeolites / Q000737:chemistry*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D017641:Zeolites; D009584:Nitrogen