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Controlling micropollutants in tertiary municipal wastewater by O/HO, granular biofiltration and UV/HO for potable reuse applications.

08:00 EDT 27th August 2019 | BioPortfolio

Summary of "Controlling micropollutants in tertiary municipal wastewater by O/HO, granular biofiltration and UV/HO for potable reuse applications."

A comprehensive pilot study was carried out to experimentally assess the potential of newly developed treatment trains integrating two-stage AOPs and biofiltration to reach potable reuse water quality standards from municipal wastewater. The processes consisted of a two-stage AOPs with (carbon or limestone) biofiltration, the first AOP (O/HO) serving as pre-treatment to biofiltration and the second AOP (UV/HO) serving as post-biofiltration finishing step to ensure advanced disinfection. A comprehensive monitoring campaign was put in place resulting from the combination of targeted, non-targeted and suspect screening measurements. It was found that 13 organic micropollutants were detected from a list of 219 suspects although at ng/L level only. For the treatment conditions piloted in this study (O = 13 ± 0.5 mg/L, HO = 11 ± 0.4 mg/L for the O/HO process, and UV = 410 ± 63.5 mJ/cm, HO = 5 mg/l for the UV/HO process), it was possible to estimate the overall removal efficacy for each unit process, which was found to follow this order: RO (99%)  > BAC (87%) > O-HO (78%)  > BAL (67%)  > UV/HO (43%)  > AOP contact chamber (19%)  > UF(0%), with the treatment train integrating two AOPs and granular biofiltration with activated carbon (O/HO + BAC + UV/HO) showing superior performance with a 99% abatement in total micropollutants. No ecotoxicologically-positive response was generally observed for any of the effluent samples from the tested trains, even when pre-concentration factors up to 100-1000 times were employed to increase the sensitivity of the bioassay methods.

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Name: Chemosphere
ISSN: 1879-1298
Pages: 124635

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