title: Embedding constructed wetland in sequencing batch reactor for enhancing nutrients removal: A comparative evaluation.
abstract: In the present study, a novel green bio-sorption reactor (GBR) was firstly proposed and preliminarily investigated by embedding constructed wetland (CW) into the aeration tank of the conventional activated sludge (CAS). This integrated novel system owns the striking features of adding carriers of wetland substrate (i.e. the dewatered alum sludge in this case) in CAS for robust phosphorus adsorption and enriching the biomass. Meanwhile, the "green" feature of this GBR imparted aesthetic value of CW to the CAS system. The preliminary 3-month trial of GBR based on a sequencing batch reactor (GB-SBR) with diluted piggery wastewater demonstrated an average removal of 96%, 99% and 90% for BOD, TP and TN, respectively. The comparison with moving bed biofilm reactor (MBBR) and integrated fixed-film activated sludge (IFAS) reflected the advantages of GBR over purification performance, aesthetic value and potential carbon sink. Moreover, the carriers used in the GBR are dewatered alum sludge which is in line with the policy of "recycle, reuse and reduce". Overall, this GBR undoubtedly offered a more sustainable and economical solution for retrofitting the aging CAS.
authors.affiliation: UCD Dooge Centre for Water Resources Research, School of Civil Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Ranbin
authors.initials: R
authors.lastname: Liu
authors.affiliation: UCD Dooge Centre for Water Resources Research, School of Civil Engineering, University College Dublin, Belfield, Dublin 4, Ireland; School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, 710048, Shaanxi, PR China. Electronic address: yaqian.zhao@ucd.ie.
authors.forename: Yaqian
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: College of Urban Construction, Nanjing Tech University, Nanjing, 211816, PR China.
authors.forename: Jinhui
authors.initials: J
authors.lastname: Zhao
authors.affiliation: UCD Dooge Centre for Water Resources Research, School of Civil Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Lei
authors.initials: L
authors.lastname: Xu
authors.affiliation: Ecole des Mines de Nantes, Energy Systems Environment Department, 4 rue Afred Kastler, BP 20722, 44307, Nantes Cedex 3, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Sibille
mesh_terms: D018441:Biofilms; D019149:Bioreactors; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater; D053833:Wetlands
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Activated sludge; Aesthetic value; Alum sludge; Constructed wetland; Green bio-sorption reactor (GBR); Simultaneous nitrification and denitrification (SND)