Removal of paraquat pesticide with Fenton reaction in a pilot scale water system

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Cátia Oliveira (Author) FEUP; K. Gruskevica (Author) Other; T. Juhna (Author) Other; K. Tihomirova (Author) Other; Arminda Alves (Author) FEUP; Luís Madeira (Author) FEUP

Journal

Title: Drinking Water Engineering and Science

Vol. 7 No. 1

Pages: 11-21

ISSN: 1996-9457

Publisher: Copernicus

Indexing

ISI Web of Science

Scopus - 9 Citations

Scientific classification

FOS: Engineering and technology

Associated Projects

SECUREAU - Security and decontamination of drinking water distribution systems following a deliberate contamination

ACQUASAFE - Segurança química em sistemas de abastecimento de água

Other information

Authenticus ID: P-009-6GW

DOI: 10.5194/dwes-7-11-2014

Abstract (EN): Advanced oxidation processes, such as the Fenton’s reagent, are powerful methods for decontamination of different environments from recalcitrant organics. In this work, the degradation of paraquat (PQ) pesticide was assessed (employing the commercial product gramoxone) directly inside the pipes of a pilot scale loop system; the effect of corroded cast iron pipe and loose deposits for catalysing the process was also evaluated. Results showed that complete degradation of paraquat ([PQ]0 = 3.9 × 10−4 M, T = 20–30 ◦C, pH0 = 3, [H2O2]0 = 1.5 × 10−2 M and [Fe (II)] = 5.0 × 10−4 M,) was achieved within 8 h, either in lab scale or in the pilot loop. Complete PQ degradation was obtained at pH 3 whereas only 30 % of PQ was degraded at pH 5 during 24 h. The installation of old cast iron segments with length from 0.5 to 14 m into PVC pipe loop system had a significant positive effect on degradation rate of PQ, even without addition of iron salt; the longer the iron pipes section, the faster was the pesticide degradation. Addition of loose deposits (mostly corrosion products composed of goethite, magnetite and a hydrated phase of FeO) also catalysed the Fenton reaction due to presence of iron in the deposits. Moreover, gradual addition of hydrogen peroxide improved gramoxone degradation and mineralization. This study showed for the first time that is possible to achieve complete degradation of pesticides in situ pipe water system and that deposits and corroded pipes catalyse oxidation of pesticides.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11