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The objective of this study is to investigate the production of hydrochars by acetic acid or sodium hydroxide assisted hydrothermal carbonization (HTC), various activation methods, and the potential of hydrochar as an adsorbent to remove NH4+-N and PO43\u2212-P from wastewater. The results showed that acetic acid or sodium hydroxide assisted HTC and activation with magnesium chloride or air could improve the surface properties of hydrochar. Acetic acid modification generated extensive oxygenated functional groups, while sodium hydroxide modification produced hydrochar with a high N\/C ratio and surface aromaticity. Treating hydrochar with magnesium chloride could impregnate nano-magnesium particles on the hydrochar, thereby improving the ability to remove N and P. Air activation of hydrochar resulted in more oxygen containing functional groups. The NH4+-N and PO43\u2212-P adsorption capacities of these hydrochars ranged from 92.6 to 122.4mg\/g and 1.6 to 15.8mg\/g, respectively. The adsorption capacity of hydrochars in swine wastewater is similar to the results of artificial wastewater. The results suggested that Mg-nanoparticle dispersion and oxygen-containing functional groups played a major role in adsorption than ion exchange and physisorption.<\/jats:p>","DOI":"10.2166\/wst.2021.378","type":"journal-article","created":{"date-parts":[[2021,9,14]],"date-time":"2021-09-14T14:49:47Z","timestamp":1631630987000},"page":"1678-1692","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":14,"title":["Production and modification of hydrochar from anaerobically digested cattail for adsorbing ammonium and phosphorous in wastewater"],"prefix":"10.2166","volume":"84","author":[{"given":"Sanjaya","family":"Ghimire","sequence":"first","affiliation":[{"name":"Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lijun","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4599-7372","authenticated-orcid":false,"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abolghasem","family":"Shahbazi","sequence":"additional","affiliation":[{"name":"Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"945","published-online":{"date-parts":[[2021,9,14]]},"reference":[{"key":"key-10.2166\/wst.2021.378-1","doi-asserted-by":"publisher","DOI":"10.1002\/ep.11840"},{"key":"key-10.2166\/wst.2021.378-2","doi-asserted-by":"publisher","DOI":"10.1007\/s13157-019-01174-7"},{"key":"key-10.2166\/wst.2021.378-3","doi-asserted-by":"publisher","DOI":"10.1080\/03601234.2017.1397454"},{"key":"key-10.2166\/wst.2021.378-4","doi-asserted-by":"publisher","DOI":"10.1039\/C8CS00493E"},{"key":"key-10.2166\/wst.2021.378-5","doi-asserted-by":"publisher","DOI":"10.3390\/su10010230"},{"key":"key-10.2166\/wst.2021.378-6","doi-asserted-by":"publisher","DOI":"10.1002\/clen.201300089"},{"key":"key-10.2166\/wst.2021.378-7","doi-asserted-by":"publisher","DOI":"10.1016\/0144-4565(88)90073-X"},{"key":"key-10.2166\/wst.2021.378-8","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph110909217"},{"key":"key-10.2166\/wst.2021.378-9","volume-title":"Water Pollution: Causes, Effects and Control","author":"Goel","year":"2006"},{"key":"key-10.2166\/wst.2021.378-10","first-page":"020016","article-title":"Effects of hydrothermal temperature and time of hydrochar from Cattail leaves","author":"Jaruwat","year":"2018"},{"key":"key-10.2166\/wst.2021.378-11","doi-asserted-by":"publisher","DOI":"10.1016\/j.biortech.2018.12.079"},{"key":"key-10.2166\/wst.2021.378-12","doi-asserted-by":"publisher","DOI":"10.1007\/s13762-015-0766-5"},{"key":"key-10.2166\/wst.2021.378-13","doi-asserted-by":"publisher","DOI":"10.2134\/jeq2010.0453"},{"key":"key-10.2166\/wst.2021.378-14","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/978-94-007-7814-6_1","article-title":"Eutrophication: challenges and solutions","volume-title":"Eutrophication: Causes, Consequences and Control","author":"Khan","year":"2014"},{"key":"key-10.2166\/wst.2021.378-15","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2014.09.096"},{"key":"key-10.2166\/wst.2021.378-16","volume-title":"Effects of Cattail Management on Invertebrate Production and Migratory Bird use of Cheyenne Bottoms, KS. 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