AWWA JAW39584

A new process that combines membrane bioreactor (MBR) technology and powdered activated carbon (PAC) has been developed at industrial scale. This process denitrifies, removes natural organic matter (NOM) and pesticides, and disinfects. Denitrification is carried out by heterotrophic bacteria using ethanol as a carbon source. PAC added to the bioreactor adsorbs pesticides and a fraction of NOM. The membrane keeps the solids and high-molecular-weight compounds in the bioreactor by separating them from the treated water. Ultrafiltration removes protozoa, bacteria, and viruses, thus achieving disinfection. Chlorine is added to the ultrafiltered water to maintain quality in the distribution system. Includes 45 references, tables, figures.