NOM removal by biofiltration

Anderson, Lindsay; Swinamer, Ryan; Earle, Martin R.; Stoddart, Amina K.; Gagnon, Graham A.; Park, Yuri

doi:10.1016/b978-0-12-824274-2.00009-0

Cited by 1 publication

(1 citation statement)

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“…Despite being close to saturation, it outperformed the conventional filters. Some of this removal may be driven by biodegradation as opposed to adsorption (Anderson et al, 2022; Brown et al, 2020; Korotta‐Gamage & Sathasivan, 2017) given that these filters are passive biofilters (e.g., no free chlorine residual in filter influent).…”

Section: Resultsmentioning

confidence: 99%

Adapting direct filtration to increasing source water dissolved organic carbon using clarification and granular activated carbon

Anderson,

Tchonlla,

Earle

et al. 2023

AWWA Water Science

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Changing source water quality namely through increasing natural organic matter (NOM) concentration challenges surface water treatment, especially direct filtration. We conducted a pilot‐scale assessment of various adaptation strategies (e.g., clarification, granular activated carbon [GAC] filtration) for direct filtration facilities under the stress of rising NOM levels. Recognizing that changing source water can impact broader aspects of treatment, we considered the implications of Fe and Mn removal via KMnO4 pre‐oxidation. GAC media showed promise as an adaptation strategy, providing ~60% removal of dissolved organic carbon (DOC), and a significant reduction in disinfection by‐product formation potential (DBPfp). However, KMnO4 pretreatment showed limited Mn and Fe removal, and filters with GAC media released dissolved Mn at up to ~30% of prefilter levels. These data suggest that using GAC may come with the risk of poor Mn removal performance if Mn is not removed during pretreatment. This work highlights the complexities anticipated under emerging climate pressures and emphasizes the need for comprehensive treatment solutions that consider factors beyond NOM.

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Section: Resultsmentioning

confidence: 99%