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However, the release of phosphorus from sludge is accompanied by the leaching of large amounts of coexisting ions, i.e., Fe, Al, Ca, and organic matter, which decreases the purity of sludge-derived products. In this study, an adsorption-desorption process using magnetic zirconia (MZ) as the adsorbent is proposed to obtain a high purity recovery product. The process involves selective adsorption of phosphate from the hydrothermally treated sludge supernatant (HTSS) using MZ, followed by desorption and precipitation to obtain the final product: struvite. The results indicated that at a dosage of 15 g\/L, more than 95% of phosphorus in the HTSS could be adsorbed by MZ. Coexisting ions (Ca2+, Mg2+, Fe3+, Al3+, SO42\u2212, NO3\u2212, Cl\u2212, etc.) and organic matter (substances similar to fulvic and humic acid) in the HTSS had a limited inhibitory effect on phosphate adsorption. Using a binary desorption agent (0.1 mol\/L NaOH + 1 mol\/L NaCl), 90% of the adsorbed phosphorus could be desorbed. Though adsorption-desorption treatment, struvite purity of the precipitated product increased from 41.3% to 91.2%. Additionally, MZ showed good reusability, maintaining a &gt;75% capacity after five cycles. X-ray photoelectron spectroscopy (XPS) indicated that MZ adsorbed phosphate mainly by inner-sphere complexation. This study provided a feasible approach for the recovery of phosphorus from sludge with high purity.<\/jats:p>","DOI":"10.3390\/ijerph192013156","type":"journal-article","created":{"date-parts":[[2022,10,13]],"date-time":"2022-10-13T20:55:11Z","timestamp":1665694511000},"page":"13156","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["High Purity Struvite Recovery from Hydrothermally-Treated Sludge Supernatant Using Magnetic Zirconia Adsorbent"],"prefix":"10.3390","volume":"19","author":[{"given":"Zhe","family":"Wang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuai","family":"Guan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yajuan","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Shi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiake","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiqiang","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi\u2019an University of Technology, No. 5 South Jinhua Road, Xi\u2019an 710048, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1038\/478029a","article-title":"A broken biogeochemical cycle","volume":"478","author":"Elser","year":"2011","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1016\/j.gloenvcha.2008.10.009","article-title":"The story of phosphorus: Global food security and food for thought","volume":"19","author":"Cordell","year":"2009","journal-title":"Glob. 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