title: Simultaneous removal of nitrogen and phosphorus from wastewater by means of FeS-based autotrophic denitrification.
abstract: The efficacy of iron(II) sulfide (FeS)-based autotrophic denitrification in simultaneous nitrogen and phosphorus removal from wastewater was studied with batch experiments. It was efficient at a wide pH range of 5-9, and temperature range of 10-40 °C. The concentrations of NH₄⁺-N, Mg²⁺ and HCO₃⁻ in the wastewater should be kept over 7.8, 0.24 and 30 mg L⁻¹ for efficient nitrate (NO₃⁻-N) reduction, respectively. The NO₃⁻-N removal rate increased from 0 to 82 mg L⁻¹ d⁻¹ and then leveled off when the NO₃⁻-N concentration increased from 0 to 415 mg L⁻¹ and then to 700 mg L⁻¹, respectively. The NO₃⁻-N removal rate quickly increased, leveled off, and then sharply decreased when the PO₄³⁻-P concentration increased from 0 to 0.1 mg L⁻¹, then to 114.0 mg L⁻¹, and further to 683.8 mg L⁻¹, respectively. The PO₄³⁻-P removal was over 98% when the PO₄³⁻-P concentration ranged 0-683.3 mg L⁻¹. During treatment of the secondary effluent of a local municipal wastewater treatment plant containing NO₃⁻-N of 14.9 mg L⁻¹ and total phosphorus (TP) of 3.9 mg L⁻¹, NO₃⁻-N was reduced to 1.1 mg L⁻¹ and TP was completely removed.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, 22 Hankou Road, Nanjing 210093, China. liruihua@nju.edu.cn
authors.forename: Ruihua
authors.initials: R
authors.lastname: Li
authors.forename: Jianmin
authors.initials: J
authors.lastname: Niu
authors.forename: Xinmin
authors.initials: X
authors.lastname: Zhan
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
mesh_terms: D000641:Ammonia; D002244:Carbon / Q000737:chemistry; D058440:Denitrification; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008274:Magnesium; D009566:Nitrates; D009584:Nitrogen / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical; D018508:Water Purification
chemical_list: D005290:Ferric Compounds; D009566:Nitrates; D010710:Phosphates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; C024823:ferric sulfate; D002244:Carbon; D000641:Ammonia; D008274:Magnesium; D009584:Nitrogen