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Estimation of Mercury Bioaccumulation Potential from Wastewater Treatment Plants in Receiving Waters - Phase 2 (Paperback)
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Estimation of Mercury Bioaccumulation Potential from Wastewater Treatment Plants in Receiving Waters - Phase 2 (Paperback)
Series: WERF Research Report Series
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This project was initiated in response to the establishment of
mercury TMDLs around the country and issues raised by this process,
specifically concerning the issue of mercury bioavailability. While
many TMDLs recognize that point sources constitute a small fraction
of the mercury load to a water body, a question has been raised
concerning the relative bioavailability of mercury coming from
various sources. For instance, is the mercury discharged from a
wastewater treatment plant more or less bioavailable than mercury
in precipitation, mercury in urban stormwater, or mercury in
sediments? This project seeks to address this question by
developing a reliable definition and approach to estimating
bioavailability, by profiling various sources of mercury in a
watershed with regard to the species of mercury present and by
profiling those factors or conditions in either the effluent or the
receiving water that enhance or mitigate the bioavailability of
those forms. The report consists of two volumes. Volume I is a
background document for evaluating the biovailability of mercury in
wastewater effluents and receiving waters and establishes relevant
project objectives. Volume II is a guidance document for wastewater
treatment professionals interested in assessing the bioavailability
of mercury in their wastewater, comparing it to other sources, and
assessing changes in bioavailability in their effluent when it is
mixed in a receiving water body. The project concludes that, based
on available data and bioavailability as defined in this report,
wastewater effluent is one of the lowest among the sources
evaluated with respect to mercury bioavailability due to its
typically low levels of methylmercury. Due to their typically low
levels of suspended solids, wastewater treatment plants employing
post-secondary treatment should not contribute appreciably to local
sediment mercury burdens.
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