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  • 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
摘要

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.

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Sigma-Aldrich
过氧化氢 溶液, 30 % (w/w) in H2O, contains stabilizer
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过氧化氢 溶液, contains inhibitor, 30 wt. % in H2O, ACS reagent
Millipore
过氧化氢 溶液, 3%, suitable for microbiology
Supelco
过氧化氢 溶液, ≥30%, for trace analysis
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过氧化氢 溶液, 50 wt. % in H2O, stabilized
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铁, ≥99%, reduced, powder (fine)
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过氧化氢溶液, 30% (w/w), puriss. p.a., reag. ISO, reag. Ph. Eur.
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过氧化氢 溶液, contains ~200 ppm acetanilide as stabilizer, 3 wt. % in H2O
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过氧化氢 溶液, 34.5-36.5%
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过氧化氢 溶液, 30 % (w/w), for ultratrace analysis
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铁, powder, −325 mesh, 97%
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羰基铁, ≥97% Fe basis
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铁, powder, <10 μm, ≥99.9% trace metals basis
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铁, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)
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铁, flakes, ≥99.99% trace metals basis
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过氧化氢 溶液, contains inhibitor, 35 wt. % in H2O
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铁, nanopowder, 35-45 nm particle size, 99.5% trace metals basis
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过氧化氢 溶液, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis
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铁, granular, 10-40 mesh, >99.99% trace metals basis
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铁, chips, 99.98% trace metals basis
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铁, foil, thickness 0.1 mm, ≥99.9% trace metals basis
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过氧化氢 溶液, tested according to Ph. Eur.
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铁, foil, thickness 0.25 mm, ≥99.99% trace metals basis
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铁, wire, diam. 1.0 mm, ≥99.9% trace metals basis
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铁, carbon coated magnetic, nanopowder, 25 nm avg. part. size, 99.5% trace metals basis
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铁, wire, diam. 0.5 mm, ≥99.9% trace metals basis
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铁, rod, diam. 6.3 mm, 99.98% trace metals basis
铁, IRMM®, certified reference material, 0.5 mm wire

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