Abstract
The destruction of toxic, persistent, refractory, and hazardous organic compounds, often present at high concentrations in both industrial and municipal wastewaters, remains a major challenge to be overcome, mainly due to the inefficiencies of conventional processes. Notwithstanding, the search for novel treatment methods has received great attention recently. Supercritical water technology has proved to be a very promising treatment method for contaminated wastewaters and sludges. Performances of supercritical water technology in treating wastewaters from a wide variety of industries including pulp and paper, pharmaceutical, textile, pesticides, dairy, petrochemical, explosives, and distillery were reviewed. Furthermore, the effects of main operating conditions, namely temperature, pressure, residence time on the treatment efficiency, usually reported in terms of total organic carbon and chemical oxygen demand removal were summarized. In addition, well-known technical challenges faced by supercritical water processes such as corrosion, salt deposition, clogging, elevated running costs and possible solutions to mitigate those challenges have been discussed. At last, the future scope of the supercritical water technology is expected to be driven by policies aiming at the reduction of greenhouse gas emissions, environmental protection, mitigation of climate changes and the production of commercial gases from highly efficient treatment of contaminated organic wastewaters and sludges.
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The authors would like to gratefully acknowledge the financial aid provided by the Sao Paulo Research Foundation (FAPESP) under grants 2020/11874-5, and 2015/24517-8, the National Council for Scientific and Technological Development (CNPq) under grants 311035/2018-3, 432303/2018-9, and 202519/2020-1 (Royal Melbourne Institute of Technology University, senior internship) and Energy Source.
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de Souza, G.B.M., Pereira, M.B., Mourão, L.C. et al. Supercritical water technology: an emerging treatment process for contaminated wastewaters and sludge. Rev Environ Sci Biotechnol 21, 75–104 (2022). https://doi.org/10.1007/s11157-021-09601-0
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DOI: https://doi.org/10.1007/s11157-021-09601-0