Technical and economic feasibility of polyester dyeing wastewater treatment by coagulation/flocculation and Fenton's oxidation.

Technical and economic feasibility of polyester dyeing wastewater treatment by coagulation/flocculation and Fenton's oxidation.

Environmental technology (2014-04-08)

Carmen S D Rodrigues, Rui A R Boaventura, Luis M Madeira

PMID24701928

ABSTRACT

This study aims to investigate the efficiency of individual and integrated processes applied to organic matter abatement and biodegradability improvement of a polyester dyeing wastewater, namely coagulation/flocculation combined with Fenton's reagent (Approach 1), Fenton oxidation alone (Approach 2) and its integration with coagulation/flocculation (Approach 3). The effects of Fe2+ dose, initial concentration of the oxidant (H202) and temperature during Fenton's oxidation were evaluated in Approaches 1 and 2, whereas in Approach 3 the influence ofpH and flocculant dose was also assessed, during the coagulation/flocculation stage. Toxicity and biodegradability of the final effluent were also evaluated. After oxidation, a slight increase in the specific oxygen uptake rate of the effluent was observed (from 27.0 up to 28.5-30.0mg O2/(gVSSh)) and the inhibition to Vibrio fischeri was eliminated. An effluent that complies with discharge standards was obtained in all cases; however, Approach 3 revealed to be a promising solution for treating this effluent as it leads to smaller operating costs. Therefore, the use of dissolved iron resulting from Fenton's oxidation as coagulant in the second stage was shown to be an innovative, efficient and economically attractive strategy for treating these effluents.

MATERIALS

Product Number

Brand

Product Description

356808

Sigma-Aldrich

Iron, foil, thickness 0.1 mm, ≥99.9% trace metals basis

IRMM524B

Iron, IRMM^®, certified reference material, 0.5 mm wire

209309

Sigma-Aldrich

Iron, powder, −325 mesh, 97%

44890

Sigma-Aldrich

Iron, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)

88597

Millipore

Hydrogen peroxide solution, 3%, suitable for microbiology

267945

Sigma-Aldrich

Iron, chips, 99.98% trace metals basis

GF04812599

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GF61545674

Iron, tube, 100mm, outside diameter 8.0mm, inside diameter 5mm, wall thickness 1.5mm, annealed, 99.5%

GF38919279

Iron, tube, 200mm, outside diameter 20.0mm, inside diameter 16mm, wall thickness 2.0mm, annealed, 99.5%

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Iron, tube, 500mm, outside diameter 8.0mm, inside diameter 5mm, wall thickness 1.5mm, annealed, 99.5%

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Iron, tube, 100mm, outside diameter 1.0mm, inside diameter 0.8mm, wall thickness 0.1mm, as drawn, 99.5%

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Iron, tube, 200mm, outside diameter 10.6mm, inside diameter 10.0mm, wall thickness 0.3mm, as drawn, 99.8+%

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Iron, tube, 1000mm, outside diameter 2.30mm, inside diameter 2.07mm, wall thickness 0.115mm, as drawn, 99.5%

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Iron, tube, 500mm, outside diameter 1.0mm, inside diameter 0.8mm, wall thickness 0.1mm, as drawn, 99.5%

GF16616897

Iron, tube, 1000mm, outside diameter 15.0mm, inside diameter 12mm, wall thickness 1.5mm, annealed, 99.5%

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Iron, tube, 200mm, outside diameter 10.0mm, inside diameter 7mm, wall thickness 1.5mm, annealed, 99.5%

GF45478604

Iron, tube, 200mm, outside diameter 6.35mm, inside diameter 5.35mm, wall thickness 0.5mm, as drawn, 99.8%

GF92236428

Iron, tube, 500mm, outside diameter 12.7mm, inside diameter 9.5mm, wall thickness 1.6mm, annealed, 99.5%