Combined ultrasound with Fenton treatment for the degradation of carcinogenic polycyclic aromatic hydrocarbons in textile dying sludge

To develop an effective method to remove the toxic and carcinogenic polycyclic aromatic hydrocarbons (CPAHs) from textile dyeing sludge, five CPAHs were selected to investigate the degradation efficiencies using ultrasound combined with Fenton process (US/Fenton). The results showed that the synergi...

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Bibliographic Details
Published in:Environmental geochemistry and health 2018-10, Vol.40 (5), p.1867-1876
Main Authors: Zhang, Jian-Hao, Zou, Hai-Yuan, Ning, Xun-An, Lin, Mei-Qing, Chen, Chang-Min, An, Tai-Cheng, Sun, Jian
Format: Article
Language:English
Subjects:
Anthracene
Aromatic compounds
Aromatic hydrocarbons
Benzo(a)pyrene
Carcinogens
Degradation
Density
Design optimization
Dyes
Earth and Environmental Science
Environment
Environmental Chemistry
Environmental Health
Geochemistry
Hydrogen peroxide
Hydrogen Peroxide - analysis
Iron
Original Paper
Polycyclic aromatic hydrocarbons
Polycyclic Aromatic Hydrocarbons - analysis
Public Health
Pyrene
Reaction time
Sewage - analysis
Sludge
Soil Science & Conservation
Synergistic effect
Terrestrial Pollution
Textiles
Ultrasonic imaging
Ultrasound
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Summary:To develop an effective method to remove the toxic and carcinogenic polycyclic aromatic hydrocarbons (CPAHs) from textile dyeing sludge, five CPAHs were selected to investigate the degradation efficiencies using ultrasound combined with Fenton process (US/Fenton). The results showed that the synergistic effect of the US/Fenton process on the degradation of CPAHs in textile dyeing sludge was significant with the synergy degree of 30.4. During the US/Fenton process, low ultrasonic density showed significant advantage in degrading the CPAHs in textile dyeing sludge. Key reaction parameters on CPAHs degradation were optimized by the central composite design as followed: H 2 O 2 concentration of 152 mmol/L, ultrasonic density of 408 W/L, pH value of 3.7, the molar ratio of H 2 O 2 to Fe 2+ of 1.3 and reaction time of 43 min. Under the optimal conditions of the US/Fenton process, the degradation efficiencies of five CPAHs were obtained as 81.23% (benzo[a]pyrene) to 84.98% (benz[a]anthracene), and the benzo[a]pyrene equivalent (BaP eq ) concentrations of five CPAHs declined by 81.22–85.19%, which indicated the high potency of US/Fenton process for removing toxic CPAHs from textile dyeing sludge.
ISSN:0269-4042
1573-2983
DOI:10.1007/s10653-017-9946-1