Near-complete phosphorus valorization from sewage sludge: Cost-effective co-production of vivianite and bioavailable detoxified hydrochar via a recyclable citric acid-mediated hydrothermal process - Xiaohan Cui; Yumeng Jin; Jian Zhu; Zhiyi Sun; Changkai Yin; Changfu Yang; Meifang Li; Long Kong; Chuansheng Chen; Zhihang Yuan; Ziyang Lou (Water Research, 2026)