Nonylphenol polyethoxylate degradation by means of electrocoagulation and electrochemical Fenton
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In: Separation and Purification Technology, Vol. 50, No. 2, 15.06.2006, p. 249-255.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Nonylphenol polyethoxylate degradation by means of electrocoagulation and electrochemical Fenton
AU - Martins, Ayrton F
AU - Wilde, Marcelo Luis
AU - Vasconcelos, Tibiriça G.
AU - Henriques, Danielle M
N1 - Funding Information: The authors wish to thank the government agency CNPq/CT Hidro for the financial support and scholarships.
PY - 2006/6/15
Y1 - 2006/6/15
N2 - This study investigated the degradation of nonylphenol polyethoxylate (9 ethylene oxide unities, NP9EO) in aqueous solution and textilewastewater by electrocoagulation (iron and aluminum electrodes) and electrochemical Fenton. The studied processes had as parameters NP9EOconcentration (measured by HPLC), chemical oxygen demand (COD), integrated absorbance (200–800 nm) and hydrogen peroxide concentration(H2O2). First, it was determined the NP9EO concentration in textile wastewater by means of a modified procedure based on the extractionof surfactants. A factorial design 24 was employed to optimize the experimental conditions for NP9EO degradation in aqueous solution byelectrocoagulation, through the following variables: NP9EO concentration, applied current, temperature and electrode material. The use of aluminumelectrodes brought the most significant effects. The best performance was achieved by experiments using 20 mg L−1 aqueous NP9EO, 1.5 A andaluminum electrodes (around 95% removal in 30 min). The best experimental conditions achieved using factorial design were applied to textilewastewater treatment. The electrocoagulation using Al-electrodes allowed the NP9EO degradation and COD reduction of 95 and 50%, respectively,in only 15 min treatment. In order to enhance the aqueous NP9EO degradation obtained by electrocoagulation with iron electrodes, electrochemicalFenton was also performed and 95% NP9EO removal was achieved in 5 min (aqueous solution) and 10 min (wastewater) treatment, respectively.Besides the organic load removal (COD reduction) having not surpassed 55% in both processes, the total NP9EO removal of the textile wastewaterwas equally efficient by both aqueous solution and textile wastewater treatment (causing almost total degradation).
AB - This study investigated the degradation of nonylphenol polyethoxylate (9 ethylene oxide unities, NP9EO) in aqueous solution and textilewastewater by electrocoagulation (iron and aluminum electrodes) and electrochemical Fenton. The studied processes had as parameters NP9EOconcentration (measured by HPLC), chemical oxygen demand (COD), integrated absorbance (200–800 nm) and hydrogen peroxide concentration(H2O2). First, it was determined the NP9EO concentration in textile wastewater by means of a modified procedure based on the extractionof surfactants. A factorial design 24 was employed to optimize the experimental conditions for NP9EO degradation in aqueous solution byelectrocoagulation, through the following variables: NP9EO concentration, applied current, temperature and electrode material. The use of aluminumelectrodes brought the most significant effects. The best performance was achieved by experiments using 20 mg L−1 aqueous NP9EO, 1.5 A andaluminum electrodes (around 95% removal in 30 min). The best experimental conditions achieved using factorial design were applied to textilewastewater treatment. The electrocoagulation using Al-electrodes allowed the NP9EO degradation and COD reduction of 95 and 50%, respectively,in only 15 min treatment. In order to enhance the aqueous NP9EO degradation obtained by electrocoagulation with iron electrodes, electrochemicalFenton was also performed and 95% NP9EO removal was achieved in 5 min (aqueous solution) and 10 min (wastewater) treatment, respectively.Besides the organic load removal (COD reduction) having not surpassed 55% in both processes, the total NP9EO removal of the textile wastewaterwas equally efficient by both aqueous solution and textile wastewater treatment (causing almost total degradation).
KW - Chemistry
KW - Electrochemical Fenton
KW - Electrocoagulation
KW - Nonylphenol polyethoxylate
KW - Textile wastewater
UR - http://www.scopus.com/inward/record.url?scp=33646836250&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/01883414-8dec-338c-bcb7-0a8b530919d9/
U2 - 10.1016/j.seppur.2005.11.032
DO - 10.1016/j.seppur.2005.11.032
M3 - Journal articles
VL - 50
SP - 249
EP - 255
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
IS - 2
ER -