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Trace and Bulk Organics Removal during Ozone-Biofiltration Treatment for Potable Reuse Applications.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Trace and Bulk Organics Removal during Ozone-Biofiltration Treatment for Potable Reuse Applications."

This study investigated impact of ozone/biological activated carbon (BAC) filtration design and operational parameters on contaminants of emerging concern (CEC) and bulk organics removal over 450 days of operation. Two parallel BAC filters with identical media and influent were maintained, each at a different empty bed contact time of 10 and 20 minutes. This study captured the CEC removal performance of a BAC filter over an extended operational period after treating 65,000 bed volumes. Ozone system was operated at ozone dose to TOC ratio range of 0.9 to 2. Biofilter with lower EBCT (10 min) and exhausted media resulted in poor removals of Tris(2-chloroethyl) phosphate (TCEP), perfluorooctanoic acid (PFOA), sucralose, meprobamate, N,N-Diethyl-m-toluamide (DEET), and cotinine. Biofilter with higher EBCT (20 min) and remaining adsorptive effects resulted in significant (84% or more) removal of all CECs that were detected in the ozonated effluent. Increasing both ozone dose and BAC EBCT resulted in increased removal of UV absorbance (UVA ). The evaluation of impact of ozone:TOC ratio and BAC EBCT on CEC removal, bulk organics (TOC) and UVA performed in this study confirmed the importance of these two parameters on overall success of non-reverse osmosis (RO) potable reuse projects. This article is protected by copyright. All rights reserved.

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This article was published in the following journal.

Name: Water environment research : a research publication of the Water Environment Federation
ISSN: 1554-7531
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