Dissolved Organic Carbon Removal By
Biological Treatment
Author(s)
C. Pipe-Martin
Abstract
Dissolved organic carbon (DOC) is problematic in water recycling or wastewater
disposal when it provides precursors for disinfection by-product formation or
when it provides a carbon/energy source for microorganisms and biofilms in
receiving waters and in distribution systems. Biologically stable water protects
receiving waters and recycled water systems. This paper provides initial findings
of a research project into optimising DOC removal from water by biological
treatment in order to improve its quality and protect public and environmental
health. Biological treatment achieves this goal while minimising highly
technological and energy intensive processes. The effects of chemical
pretreatment, dissolved oxygen, filtration media choice, pre-oxidation and flow
rate are reported.
Initial results demonstrate that low flow rate biologically active carbon (BAC)
filtration can exhibit biological degradation processes with much higher DOC
removal than typically observed in conventional BAC filtration. Results also
indicate that the high level of biological activity observed requires aeration to
meet oxygen demand and that ozonation improves DOC removal but is not
essential for high rate removal. Characterisation of the DOC components
removed has been conducted and has identified and quantified the organic
compound fractions removed by the biological processes. BAC filtration has the
potential to achieve high levels of DOC removal with low energy consumption
Keywords: DOC removal biological treatment water stability biofilm BAC.
1 Introduction
1.1 Project scope
There has been enormous growth in the use of recycled water in recent years. At
the same time discharge limits for contaminants in wastewater released to
Keywords
DOC removal biological treatment water stability biofilm BAC.
Related Book
Other papers in this volume
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