Holistic Assessment of Trace Organic Compounds (TOrC) in Wastewater Treatment


Ebook only

Available as an ebook

Please purchase via www.iwaponline.comOpens in new window

Also part of Water Intelligence Online Digital Reference Library

Standard ePrice: £28.00


Access ebook

Author(s): WERF

Publication Date: 15/11/2014

Pages: 120

ISBN13: 9781780405179

eISBN: 9781780405179

Download book flyer Print page

A study of trace organic compound (TOrC) reactivity to selected, advanced wastewater treatment processes was conducted as part of a demonstration-scale pilot study. The pilot facilities consisted of a biological nitrogen removal (BNR) activated sludge treatment process, parallel membrane and granular media filtration processes and a biologically active filter preceded by ozone treatment, and three parallel disinfection processes: free chlorine, ozone, and UV irradiation. Twelve trace organic indicator compounds were selected to represent the treatability of a breadth of compounds. Measurements of TOrC concentrations entering and exiting each unit process were made over a period of nine months, under a range of operating conditions to assess the treatability of each compound by each process. Comparisons were made to TOrC treatability through the existing full scale plant, a high purity oxygen activated sludge (HPOAS) secondary treatment plant using chloramination for disinfection.

Eight of the twelve studied indicator TOrCs were reduced through the BNR process. Removals through the BNR process were more effective than removals through the HPOAS process, likely owing to longer solids retention time (SRT) and higher mixed liquor suspended solids (MLSS) concentration in the BNR process providing more bio-oxidation capacity than in the HPOAS process. Neither membrane nor granular media filtration was effective in reducing TOrCs, implying TOrCs are not particle associated. Many of the TOrCs were reduced by ozone treatment preceding biologically active filtration. The biologically active filter was not effective at reducing TOrCs, with the exception of NDMA, which was formed during ozonation, but then reduced through the bio-filter. Post-filtration disinfection processes had varying degrees of effectiveness reducing TOrCs, with ozone being most effective, followed by chlorine and UV.

Also available as part of your Water Inteligence Online subscription


The latest from @IWApublishing

Discover this insightful article in the Journal of Water, Sanitation & Hygiene for Development. The journal is FR… https://t.co/gwmHxrLmxV 15 hours 21 min ago
RT : A review of greywater characteristics and treatment processes | Water Science and Technology | IWA Publishing https://t.co/V91YVGt0b8 15 hours 25 min ago
RT : New Research: Design and operation of submerged layer in bioretention for enhanced nitrate removal https://t.co/cKvpyZp4aM 15 hours 25 min ago