Details

Autor(en) / Beteiligte

• Ferreira, M. Barbosa
• Muñoz-Morales, M.
• Sáez, C.
• Cañizares, P.
• Martínez-Huitle, C.A.
• Rodrigo, M.A.

Titel

Improving biotreatability of hazardous effluents combining ZVI, electrolysis and photolysis

Ist Teil von

• The Science of the total environment, 2020-04, Vol.713, p.136647-136647, Article 136647

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2020

Quelle

MEDLINE

Beschreibungen/Notizen

• In this work, nine types of combination advanced oxidation processes/zero-valent iron (AOP-ZVI) were tested, in order to determine if any of these combinations demonstrate good chances as pretreatment for the biological degradation processes of organochlorinated pollutants. To do this, the changes undergone in the respirometric behavior, toxicity and short-term biodegradability were compared. The three AOPs studied were anodic oxidation with mixed metal oxides anodes (AO-MMO), with boron doped diamond anodes (AO-BDD) and photolysis and they were evaluated in three different modes: without any addition of ZVI, with ZVI-dehalogenation as pre-treatment and with ZVI-dehalogenation simultaneous to the AOP treatment. Clopyralid has been used as a model of chlorinated hydrocarbon pollutant. Results show that technologies proposed can successfully treat wastes polluted with clopyralid and the biological characteristics of the waste are significantly modified by dehalogenating the waste with ZVI, either previously to the treatment or simultaneously to the treatment, being the information provided by the three techniques very important in order to evaluate later combinations of the advanced oxidation technologies with biological treatments. [Display omitted] •Important effect of dehalogenation on biological degradation•Addition of ZVI modifies importantly the characteristics of wastes.•Great changes with the use of ZVI as pre-treatment or simultaneous to the AOP•Better respirometric behavior was observed after photolysis treatments.•Lower toxicity was achieved using ZVI dehalogenation.•BDD-electrolysis improves the biodegradability of the effluents.