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Metals Removal Technologies for Urban Stormwater (Paperback)
Loot Price: R3,487
Discovery Miles 34 870
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Metals Removal Technologies for Urban Stormwater (Paperback)
Series: WERF Research Report Series
Expected to ship within 12 - 17 working days
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This study, on innovative methods for the capture of metals from
stormwater, mainly focused on two major areas of investigation:
media filters and swales. Twelve media were chosen for initial
evaluation. The three best performing media: peat-sand mix,
compost, and zeolite were then selected for in-depth study. The
results of this investigation emphasize the importance of
characterizing the stormwater before selecting a treatment media
since the type and quantity of metals, pH, and other runoff
characteristics can vary a great deal between sites. For example,
determining the range of metal concentrations to be treated is
crucial to selecting the best media, since the removal efficiencies
of the media relative to each other changed with varying metal
concentration. Media that were effective at high metals
concentrations were outperformed by some media at the low metals
concentrations typically found in stormwater. Upflow columns proved
more effective than downflow columns in the control of detention
time and a reduction in clogging of the media by solids and
associated head loss in the column. Studies on the effect of
anaerobiosis on metal retention by filter systems indicated that
heavy metals were not mobilized from filter systems under anaerobic
conditions. It was found that metal retention within the filters
was not different from what was observed in oxygenated
environments. However, it is plausible that under certain specific
environmental conditions, co-precipitation of metals by iron- and
sulfate- reducing bacteria may take place in stormwater treatment
systems. Tests also indicate that the heavy metals of concern
remain strongly bound to the particulates during long exposures at
the extreme pH conditions likely to occur in receiving water
sediments. They will also likely remain strongly bound to the
particulates in stormwater control device sumps or detention pond
sediments where particulate-bound metals are captured.
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