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Treatment of an agrochemical wastewater by combined coagulation and Fenton oxidation
Author(s) -
Molina Raul,
Pariente Isabel,
Rodríguez Ivan,
Martínez Fernando,
Melero Juan Antonio
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4404
Subject(s) - flocculation , chemistry , wastewater , organic matter , effluent , hydrogen peroxide , microporous material , sewage treatment , coagulation , pulp and paper industry , chemical oxygen demand , turbidity , water treatment , environmental chemistry , waste management , environmental engineering , organic chemistry , environmental science , psychiatry , engineering , psychology , oceanography , geology
BACKGROUND Growing environmental concern about the presence of pesticides in water demands their removal, particularly in industrial wastewater effluents. These streams are characterized by high content of organic colloidal matter. Physicochemical treatments based on the combination of coagulation–flocculation processes have been well studied. An integral treatment of a non‐biodegradable agrochemical wastewater has been tackled by physicochemical treatment with polyferric chloride ( PFC ) followed by a homogeneous Fenton oxidation process. RESULTS The potential coagulation and flocculation properties of PFC were evaluated for PFC solutions of different OH /Fe molar ratios. TOC removal of 81% was obtained in the coagulation–flocculation pre‐treatment under the best operating conditions. The Fenton process with moderate dosage of hydrogen peroxide and 90 °C also provided an extra 37% TOC reduction. The sludge from the physicochemical process was successfully activated with KOH at 750°C , obtaining a highly microporous material of 1240 m 2 g −1 of surface area. CONCLUSION This work proposes a cost‐effective approach to the treatment of a non‐biodegradable agrochemical wastewater, achieving overall TOC reduction of 88%. The iron‐containing sludge generated in the primary physicochemical treatment when treated by thermal treatment provides a promising adsorbent. © 2014 Society of Chemical Industry