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Investigators at National Chi Nan University Discuss Findings in Chlorinated Hydrocarbons [Evaluation of the effects of nanoscale zero-valent iron...

August 22, 2014



Investigators at National Chi Nan University Discuss Findings in Chlorinated Hydrocarbons [Evaluation of the effects of nanoscale zero-valent iron (nZVI) dispersants on intrinsic biodegradation of trichloroethylene (TCE)]

By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Chlorinated Hydrocarbons. According to news reporting from Nantou, Taiwan, by NewsRx journalists, research stated, "In this study, the biodegradability of nanoscale zero-valent iron (nZVI) dispersants and their effects on the intrinsic biodegradation of trichloroethylene (TCE) were evaluated. Results of a microcosm study show that the biodegradability of three dispersants followed the sequence of: polyvinyl alcohol-covinyl acetate-co-itaconic acid (PV3A) > polyoxyethylene (20) sorbitan monolaurate (Tween 20) > polyacrylic acid (PAA) under aerobic conditions, and PV3A > Tween 20 > PAA under anaerobic conditions."

The news correspondents obtained a quote from the research from National Chi Nan University, "Natural biodegradation of TCE was observed under both aerobic and anaerobic conditions. No significant effects were observed on the intrinsic biodegradation of TCE under aerobic conditions with the presence of the dispersants. The addition of PAA seemed to have a slightly adverse impact on anaerobic TCE biodegradation. Higher accumulation of the byproducts of anaerobic TCE biodegradation was detected with the addition of PV3A and Tween 20. The diversity of the microbial community was enhanced under aerobic conditions with the presence of more biodegradable PV3A and Tween 20. The results of this study indicate that it is necessary to select an appropriate dispersant for nZVI to prevent a residual of the dispersant in the subsurface."

According to the news reporters, the research concluded: "Additionally, the effects of the dispersant on TCE biodegradation and the accumulation of TCE biodegrading byproducts should also be considered."

For more information on this research see: Evaluation of the effects of nanoscale zero-valent iron (nZVI) dispersants on intrinsic biodegradation of trichloroethylene (TCE). Water Science and Technology, 2014;69(11):2357-2363. Water Science and Technology can be contacted at: Iwa Publishing, Alliance House, 12 Caxton St, London SW1H0QS, England. (IWA Publishing - www.iwaponline.com; Water Science and Technology - www.iwaponline.com/wst)

Our news journalists report that additional information may be obtained by contacting Y.C. Chang, Natl Chi Nan Univ, Dept. of Civil Engn, Nantou 54561, Taiwan. Additional authors for this research include S.C. Huang and K.F. Chen (see also Chlorinated Hydrocarbons).

Keywords for this news article include: Asia, Nantou, Taiwan, Nanoscale, Nanotechnology, Trichloroethylene, Emerging Technologies, Chlorinated Hydrocarbons

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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