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- Title
Removal of nonionic surfactant from electroplating wastewater by fluidized zerovalent iron with two oxidants (H<sub>2</sub>O<sub>2</sub>/Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>).
- Authors
Shiao-Shing Chen; Hung-Te Hsu; Huan-Jong Tsui; Yu-Min Chang
- Abstract
Removal of nonylphenol polyethoxylate with 9 mol of ethoxylate (NP9EO), a nonionic surfactant, from electroplating wastewater by fluidized zerovalent iron (ZVI) with two oxidants (ZVI/H2O2 and ZVI/S2O2-8) was studied. There are several benefits of using the proposed system: (1) the free radicals that result from the processes can reduce the organic contents and the occurrence of nonylphenol, an endocrine disruptor, (2) the ferric ion, dissoluted from the reaction for ZVI, can act as a coagulant to assist in the following precipitation process and (3) a higher ZVI utilization for the fluidized process due to abrasive motion of the ZVI. For the ZVI/H2O2 system, under optimum operating conditions, when the pH is 4.0, and Hydraulic Detention Time (HDT) 1.5 min and H2O2 concentration 23.6mM, NP9EO and TOC removal efficiencies were 99 and 54%, respectively. The removal efficiency were increased with increased H2O2 dosage, but became reduced when H2O2 dosage was in excess of 23.6mM. For the ZVI/S2O2 8 system, when the optimum operating conditions for pH value and HDT were 4.5 and 0.75 min, the removal efficiencies increased with an increase in S2O2-8 dosage. The removal efficiency of the ZVI/H2O2 was better than that of ZVI/S2O2-8 at the same pH value, HDT and oxidant dosage, but less acidity was required to maintain the constant pH for the ZVI/S2O2-8 system. In addition, ferrous ion, which was able to be measured quickly, can be used as an indicator for the removal of both TOC and NP9EO.
- Subjects
IRON; SEWAGE purification; WATER purification; NONIONIC surfactants; NONYLPHENOL; COAGULATION (Sewage purification)
- Publication
Desalination & Water Treatment, 2013, Vol 51, Issue 7-9, p1678
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2012.693657