Synergistic microbubble ozonation and CaO2 activation for refinery sludge valorization: Organic carbon liberation and petroleum hydrocarbon degradation - Di Shu; Ziyang Lou; Kaiyan Yang; Zhiyi Sun; Hui Wang; Zhaowen Cheng; Pin Zhou; Shuping Zhang; Nanwen Zhu; Luochun Wang (Journal of Environmental Management, 2026)