title: Pyrolysis of wetland biomass waste: Potential for carbon sequestration and water remediation.
abstract: Management of biomass waste is crucial to the efficiency and sustainable operation of constructed wetlands. In this study, biochars were prepared using the biomass of 22 plant species from constructed wetlands and characterized by BET-N2 surface area analysis, FTIR, TGA, SEM, EDS, and elemental compositions analysis. Biochar yields ranged from 32.78 to 49.02%, with mesopores dominating the pore structure of most biochars. The biochars had a R50 recalcitrance index of class C and the carbon sequestration potential of 19.4-28%. The aquatic plant biomass from all the Chinese constructed wetlands if made into biochars has the potential to sequester 11.48 Mt carbon yr(-1) in soils over long time periods, which could offset 0.4% of annual CO2 emissions from fossil fuel combustion in China. In terms of adsorption capacity for selected pollutants, biochar derived from Canna indica plant had the greatest adsorption capacity for Cd(2+) (98.55 mg g(-1)) and NH4(+) (7.71 mg g(-1)). Whereas for PO4(3-), Hydrocotyle verticillata derived biochar showed the greatest adsorption capacities (2.91 mg g(-1)). The results from this present study demonstrated that wetland plants are valuable feedstocks for producing biochars with potential application for carbon sequestration and contaminant removal in water remediation.
authors.affiliation: Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
authors.forename: Xiaoqiang
authors.initials: X
authors.lastname: Cui
authors.affiliation: Ningbo Raw Water Resource Research Academy, Ningbo, 315000, China.
authors.forename: Hulin
authors.initials: H
authors.lastname: Hao
authors.affiliation: Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945, USA.
authors.forename: Zhenli
authors.initials: Z
authors.lastname: He
authors.affiliation: Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945, USA.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Stoffella
authors.affiliation: Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China. Electronic address: xyang@zju.edu.cn.
authors.forename: Xiaoe
authors.initials: X
authors.lastname: Yang
mesh_terms: D000327:Adsorption; D064751:Ammonium Compounds / Q000032:analysis; D018533:Biomass; D002104:Cadmium / Q000032:analysis; D057965:Carbon Sequestration; D028041:Centella / Q000378:metabolism; D002606:Charcoal / Q000737:chemistry*; D055598:Chemical Phenomena; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D052918:Environmental Restoration and Remediation; D010710:Phosphates / Q000032:analysis; D010944:Plants; D012987:Soil / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands; D019862:Zingiberales / Q000378:metabolism
chemical_list: D064751:Ammonium Compounds; D010710:Phosphates; D012987:Soil; D014874:Water Pollutants, Chemical; C540010:biochar; D002104:Cadmium; D014867:Water; D002606:Charcoal
keywords: Ammonium; Biochars; Cadmium; Phosphate; Plant species; Sorption capacity