This study was conducted to examine the kinetics of
manganese sorption on oxide-coated filter media. Initial
experimentation confirmed the findings of other investigators,
the Mn2+ sorption capacity of oxide-coated media
increases as solution pH increases. Further study revealed
that uptake rate kinetics could be described by first order
kinetics and also increased with increasing solution pH.
The addition of free chlorine (HOCl) to solution greatly
enhanced Mn2+ uptake rate kinetics. Later studies indicated
that the oxide coating had very little impact on the
physical properties of the media tested.
Actual data from a water treatment plant filter
confirmed laboratory experimental results by showing that
sorption of soluble manganese does indeed occur on oxidecoated
filters. The water treatment plant data also
suggested that the sorption kinetics were relatively rapid,
again upholding laboratory findings.
Results from the manganese kinetics and sorption
experiments were combined to formulate a theoretical model
which would predict manganese breakthrough in a filter,
given a known set of loading parameters. Preliminary use of
the model indicated that oxide-coated filters could sorb significant quantities of soluble manganese before
detectible levels of manganese appear in the effluent.
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