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Self-regulating calcium peroxide-ozone system for treating refractory industrial wastewater: Mechanistic elucidation, pilot-scale application, and techno-economic analysis.

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Title: Self-regulating calcium peroxide-ozone system for treating refractory industrial wastewater: Mechanistic elucidation, pilot-scale application, and techno-economic analysis.
Authors: Huang, Yu-Kun1 (AUTHOR), Chen, Xin-Jia1 (AUTHOR), Duan, Pi-Jun1 (AUTHOR), Wang, Jing1 (AUTHOR), Bai, Chang-Wei1 (AUTHOR), Zhang, Zhi-Quan1 (AUTHOR), Huang, Jun-Jie1 (AUTHOR), Xu, Xiao-Wei1 (AUTHOR), Chen, Fei1 (AUTHOR) fchen0505@cqu.edu.cn
Source: Applied Catalysis B: Environment & Energy. Aug2026, Vol. 391, pN.PAG-N.PAG. 1p.
Subjects: Wastewater treatment, Autocatalysis, Hazardous substance management, Pilot projects, Resource recovery facilities, Lime (Minerals), Ozone, Cost benefit analysis
Abstract: This work develops a self-regulating calcium peroxide/ozone (CaO 2 /O 3) system for treating refractory industrial wastewater. The study integrated comprehensive batch tests and 60 L pilot-scale experiments with multiple mechanistic probes, including hydrolysis-pathway blocking, CaO 2 morphology characterization, electrochemical analysis, and theoretical calculations. The system achieved 96.7% nitrobenzene degradation within 18 min over pH 3.0–11.0, enhanced O 3 utilization by 38.4%, removed > 81.7% of phosphorus and heavy metals by precipitation, sustained > 83.8% COD removal for 120 h in real wastewater treatment, and lowered carbon emissions by 74.5% and treatment costs by 37.1% compared to the Fenton process. These results demonstrated that the CaO 2 /O 3 system effectively coupled pollutant mineralization with simultaneous resource recovery through a heterogeneous autocatalytic HOO-CaO 2 -O 3 intermediate pathway. By establishing a low-carbon and economically viable platform, this work promotes the practical application of next-generation oxidation technologies for complex industrial effluents. [Display omitted] • CaO 2 enabled in-situ H 2 O 2 replenishment in the peroxone reaction through self-regulation. • Ca2 + and OH- by-products from CaO 2 /O 3 enabled effective recovery of P and heavy metals. • In-depth analysis elucidated the autocatalytic mechanism of the CaO 2 /O 3 system. • Toxicity assays verified significant detoxification driven by high mineralization efficiency. • Pilot-scale validation, LCA, and cost analysis confirmed practical applicability potential. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This work develops a self-regulating calcium peroxide/ozone (CaO 2 /O 3) system for treating refractory industrial wastewater. The study integrated comprehensive batch tests and 60 L pilot-scale experiments with multiple mechanistic probes, including hydrolysis-pathway blocking, CaO 2 morphology characterization, electrochemical analysis, and theoretical calculations. The system achieved 96.7% nitrobenzene degradation within 18 min over pH 3.0–11.0, enhanced O 3 utilization by 38.4%, removed > 81.7% of phosphorus and heavy metals by precipitation, sustained > 83.8% COD removal for 120 h in real wastewater treatment, and lowered carbon emissions by 74.5% and treatment costs by 37.1% compared to the Fenton process. These results demonstrated that the CaO 2 /O 3 system effectively coupled pollutant mineralization with simultaneous resource recovery through a heterogeneous autocatalytic HOO-CaO 2 -O 3 intermediate pathway. By establishing a low-carbon and economically viable platform, this work promotes the practical application of next-generation oxidation technologies for complex industrial effluents. [Display omitted] • CaO 2 enabled in-situ H 2 O 2 replenishment in the peroxone reaction through self-regulation. • Ca2 + and OH- by-products from CaO 2 /O 3 enabled effective recovery of P and heavy metals. • In-depth analysis elucidated the autocatalytic mechanism of the CaO 2 /O 3 system. • Toxicity assays verified significant detoxification driven by high mineralization efficiency. • Pilot-scale validation, LCA, and cost analysis confirmed practical applicability potential. [ABSTRACT FROM AUTHOR]
ISSN:09263373
DOI:10.1016/j.apcatb.2026.126692