Fate of nonylphenol compounds in the treatment of simulated denim wastewater

DOI

10.2991/icseee-16.2016.2How to use a DOI?

Keywords

denim wastewater, nonylphenol ethoxylates, nonylphenol polyethoxy carboxylates, hydrolysis anaerobic, contact oxidation, conventional aerobic sludge.

Abstract

Two denim wastewater treatment processes are investigated for their efficiencies to remove the surfactant, nonylphenol ethoxylates (NPEOs). It is found that the acrid environment of the simulated denim wastewater shows no influence on the removal of NPEOs. After treatment through hydrolysis anaerobic tank, aerobic tank and sediment tank in sequence, the removal efficiency of total NPEOs (6.25-12.5 mg/L) in the wastewater can achieve a value of around 90%. But the concentration of low molecular weight NPEOs and nonylphenol polyethoxy carboxylates (NPECs) is not as low as anticipated. The quantity of low molecular weight NPEOs (2300-7500 µg/L) produced in the hydrolysis anaerobic unit will not be greatly reduced in the aerobic unit and achieves a removal efficiency of around 60%. Substantial quantities of low molecular weight NPEOs (750-2100 µg/L) remained in the outlet. A harsher environment in the conventional aerobic sludge tank will boost the production of low molecular weight NPECs (1600 µg/L to 4000 µg/L) because it promotes the contact among nonylphenol compounds, oxygen, and biomass. The contact oxidation unit is an appropriate unit for the reduction of NPECs (98 µg/L to 850 µg/L) in the effluent for its relatively neutral environment. The operating parameters such as inner recycle rate of anaerobic unit and the composition of simulated wastewater showed significant effect on the quantities of nonylphenol compounds reduced or produced during the treatment process. A high recycle rate will prompt the biodegradation of total NPEOs. Also, a composition with more dyes in the wastewater will increase the removal rate of total NPEOs and can become an important factor to influence the transformation of NPEOs in the anaerobic unit.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zijian Zhou
AU  - Zhencheng Xu
AU  - Qingwei Guo
AU  - Kai Cui
PY  - 2016/12
DA  - 2016/12
TI  - Fate of nonylphenol compounds in the treatment of simulated denim wastewater
BT  - Proceedings of the 2016 5th International Conference on Sustainable Energy and Environment Engineering (ICSEEE 2016)
PB  - Atlantis Press
SP  - 5
EP  - 17
SN  - 2352-5401
UR  - https://doi.org/10.2991/icseee-16.2016.2
DO  - 10.2991/icseee-16.2016.2
ID  - Zhou2016/12
ER  -