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Issue 11, 2018
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Wastewater chemical contaminants: remediation by advanced oxidation processes

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Abstract

Approximately 70% of the terrestrial area is covered with water, but only a small water fraction is compatible with terrestrial life forms. Due to the increment in human consumption, the need for water resources is increasing, and it is estimated that more than 40% of the population worldwide will face water stress/scarcity within the next few decades. Water recycling and reuse may offer the opportunity to expand water resources. For that, the wastewater treatment paradigm should be changed and adequately treated wastewater should be seen as a valuable resource instead of a waste product. It is easily understandable that the exact composition and constituent concentration of wastewater vary according to its different sources (industrial, agricultural, urban usage of water). Consequently, a variety of known and emerging pollutants like heavy metals, antibiotics, pesticides, phthalates, polyaromatic hydrocarbons, halogenated compounds and endocrine disruptors have been found in natural water reservoirs, due to the limited effectiveness of conventional wastewater treatment. The conventional approach consists of a combination of physical, chemical and biological processes, aiming at the removal of large sediments such as heavier solids, scum and grease and of organic content in order to avoid the growth of microorganisms and eutrophication of the receiving water bodies. However, this approach is not sufficient to reduce the chemical pollutants and much less the emerging chemical pollutants. In this review, after some considerations concerning chemical pollutants and the problematic efficiency of their removal by conventional methods, an update is presented on the successes and challenges of novel approaches for wastewater remediation based on advanced oxidation processes. An insight into wastewater remediation involving the photodynamic approach mediated by tetrapyrrolic derivatives will be underlined.

Graphical abstract: Wastewater chemical contaminants: remediation by advanced oxidation processes

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Publication details

The article was received on 13 Jun 2018, accepted on 24 Sep 2018 and first published on 26 Sep 2018


Article type: Perspective
DOI: 10.1039/C8PP00249E
Citation: Photochem. Photobiol. Sci., 2018,17, 1573-1598
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    Wastewater chemical contaminants: remediation by advanced oxidation processes

    M. Bartolomeu, M. G. P. M. S. Neves, M. A. F. Faustino and A. Almeida, Photochem. Photobiol. Sci., 2018, 17, 1573
    DOI: 10.1039/C8PP00249E

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