title: How the novel integration of electrolysis in tidal flow constructed wetlands intensifies nutrient removal and odor control.
abstract: Intensified nutrient removal and odor control in a novel electrolysis-integrated tidal flow constructed wetland were evaluated. The average removal efficiencies of COD and NH4(+)-N were above 85% and 80% in the two experimental wetlands at influent COD concentration of 300 mg/L and ammonium nitrogen concentration of 60 mg/L regardless of electrolysis integration. Effluent nitrate concentration decreased from 2.5mg/L to 0.5mg/L with the reduction in current intensity from 1.5 mA/cm(2) to 0.57 mA/cm(2). This result reveals the important role of current intensity in nitrogen transformation. Owing to the ferrous and ferric iron coagulant formed through the electro-dissolution of the iron anode, electrolysis integration not only exerted a positive effect on phosphorus removal but also effectively inhibited sulfide accumulation for odor control. Although electrolysis operation enhanced nutrient removal and promoted the emission of CH4, no significant difference was observed in the microbial communities and abundance of the two experimental wetlands.
authors.affiliation: College of Water Resources & Civil Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Ju
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China. Electronic address: wushubiao@gmail.com.
authors.forename: Shubiao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 361021 Xiamen, PR China.
authors.forename: Xu
authors.initials: X
authors.lastname: Huang
authors.affiliation: College of Water Resources & Civil Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Yansheng
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Clean Utilization Technology for Renewable Energy in Ministry of Agriculture, College of Engineering, China Agricultural University, 100083 Beijing, PR China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Dong
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000235:genetics; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D002245:Carbon Dioxide / Q000032:analysis; D004275:DNA, Ribosomal / Q000235:genetics; D058440:Denitrification / Q000187:drug effects; D004560:Electricity; D004572:Electrolysis / Q000379:methods*; D006859:Hydrogen / Q000494:pharmacology; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000302:isolation & purification*; D009609:Nitrous Oxide / Q000032:analysis; D009812:Odorants / Q000517:prevention & control*; D009930:Organic Chemicals / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D060753:Water Quality; D053833:Wetlands
chemical_list: D004275:DNA, Ribosomal; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D010758:Phosphorus; D006859:Hydrogen; D009609:Nitrous Oxide; D009584:Nitrogen; D008697:Methane
keywords: Electrolysis; Intensified nutrient removal; Odor control; Tidal flow constructed wetland; Wastewater treatment