This slide presentation begins by presenting background information on research showing how extensive herbicide and fertilizer application on
agricultural lands has resulted in groundwater
contamination.
Removal of triazine herbicides by zerovalent iron (ZVI)
through chemical reduction has been investigated and
reported recently. Removal rate and efficiency of triazine herbicides by
ZVI process are pH dependence.
Although the pH-dependent trends of triazine
removal rate and efficiency are similar for various
studies, magnitudes are very different. There are at least four possible explanations, including:
the surface of the ZVI were used;
the difference in the initial concentrations of
ATR were used;
the mixing mechanisms were employed; and,
ZVI-induced Fenton oxidation. The objective of this particular study were to:
lucidate conditions that oxidation or reduction
involved; and, investigate the
effects of pH and ZVI dosage, etc. The experimental section involved chemicals of reagent grade, and
ZVI powder (Acros Organics Co., USA) with
nominal particle size of 325 mesh (40 µm). A schematic of the experimental setup is given, along with analysis of:
the removal efficiency of atrazine as a function of reaction time at various
pH conditions; concentration of Fe<sup>2+</sup> and Total Fe content
for pH 4.0 system; and, effect of purging (pH 3). Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 790 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 06/01/2006 |
