Download or read book The Contribution of Biofilm to Nitrogenous Disinfection ByProduct Formation in Full-Scale Cyclically-Operated Drinking Water Biofilters written by Caroline Di Tommaso and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biofiltration can be effective for disinfection by-product (DBP) precursor control, however few studies have considered its role in the potential formation of DBPs. The objective of this study was to determine the contribution of biofilm-related materials to form nitrogen-containing DBPs upon chloramination and to determine the influence of cyclical biofilter operation on DBP precursor removal. Biologically active media was sampled from a full-scale biofilter operating under cold-water conditions (3.6 ± 0.5°C) and its components were extracted with a cation exchange resin into a phosphate buffering solution. N-nitrosodimethylamine (NDMA) and haloacetonitrile (HAN4) formation potential tests conducted on extracted biofilm yielded 0.80 ± 0.27 ng NDMA/g media and 18.7 ± 3.3 ng dichloroacetonitrile (DCAN)/g media. However, an analysis of NDMA formation potential and biological surrogates in the effluent of a full-scale cyclically-operated biofilter did not show release of NDMA precursors during filter start-up after stagnation periods of 6 hours or more.