Biological and physico-chemical mechanisms accelerating the acclimation of Mn-removing biofilters

McCormick, Nicole E.; Earle, Martin R.; Ha, C.; Hakes, Lyda; Evans, Ashley N.; Anderson, Lindsay; Stoddart, Amina K.; Langille, Morgan G. I.; Gagnon, Graham A.

doi:10.1016/j.watres.2021.117793

Cited by 15 publications

(8 citation statements)

References 37 publications

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“…The low concentrations of Mn and PO 4 3− in the influent water may help explain why it took 9 months to start to see consistent removal of Mn in the biofilters. Another possibility is the lack of organic substrate or sorption, notably granular activated carbon filters have been reported to acclimate faster, although that is generally attributed to chemical sorption or improved redox conditions (McCormick et al, 2021). Other studies have documented that direct absorption of Mn by the biofilm in the filter media may be the main contributor to Mn removal (Hu et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Acclimation, manganese removal, and backwash impact on full‐scale drinking water biofilter microbiome

Medina

To²,

Taylor³

et al. 2023

AWWA Water Science

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Biofiltration for drinking water treatment has several water quality benefits but questions remain about biofilter start-up in temperate climates where temperature and water quality changes can impact performance. A year-long fullscale demonstration was performed with biofilters operated in parallel to chlorinated filters to (O1) monitor the development of the biofilter microbiota across the acclimation period with respect to removal of Mn and total organic carbon, and (O2) determine the impact of depth and backwash events on the microbial community composition and function. Biofilter media biomass increased for the first 6 months of operation and after about 9 months the biofilters achieved comparable Mn removal to the chlorinated filters. Prokaryotic diversity decreased when the water temperature dropped. Backwash resulted in an increase in microbial diversity deeper in the biofilter. By the next sampling (30 h post backwash), 16S rRNA gene copies were again more abundant in the upper layers. Metagenomic sequencing confirmed the presence of moxA and mofA, Mn oxidizing genes. The results presented can help inform expected performance of full-scale biofilters in temperate climates.

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Section: Resultsmentioning

confidence: 99%

Acclimation, manganese removal, and backwash impact on full‐scale drinking water biofilter microbiome

Medina

To²,

Taylor³

et al. 2023

AWWA Water Science

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“…Except for Lysobacter , Mesorhizobium , and Woeseia , the bacteria in the N-cycle were negatively associated with nitrate, such as Haliangium , MND1, Gaiella , IS-44, Ellin6067, Nitrospira , Nordella , and Novosphingobium . Woeseia , IS-44, Ellin6067, and Nitrospira are involved in ammonia oxidation ( Zhao et al, 2020 ; McCormick et al, 2021 ; Wang L. et al, 2021 ), and Haliangium is capable of nitrification–denitrification ( Li et al, 2018 ). Gaiella and MND1 can reduce nitrate to nitrite ( Albuquerque et al, 2011 ; McCormick et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…Woeseia , IS-44, Ellin6067, and Nitrospira are involved in ammonia oxidation ( Zhao et al, 2020 ; McCormick et al, 2021 ; Wang L. et al, 2021 ), and Haliangium is capable of nitrification–denitrification ( Li et al, 2018 ). Gaiella and MND1 can reduce nitrate to nitrite ( Albuquerque et al, 2011 ; McCormick et al, 2021 ). Lysobacter , Mesorhizobium , Nordella , and Novosphingobium are diazotrophic ( Kaneko et al, 2000 ; Addison et al, 2007 ; Iwata et al, 2010 ; Cao et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Nitrate determines the bacterial habitat specialization and impacts microbial functions in a subsurface karst cave

Liu

Wang²,

Wang³

et al. 2023

Front. Microbiol.

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Karst caves are usually considered as natural laboratories to study pristine microbiomes in subsurface biosphere. However, effects of the increasingly detected nitrate in underground karst ecosystem due to the acid rain impact on microbiota and their functions in subsurface karst caves have remained largely unknown. In this study, samples of weathered rocks and sediments were collected from the Chang Cave, Hubei province and subjected to high-throughput sequencing of 16S rRNA genes. The results showed that nitrate significantly impacted bacterial compositions, interactions, and functions in different habitats. Bacterial communities clustered according to their habitats with distinguished indicator groups identified for each individual habitat. Nitrate shaped the overall bacterial communities across two habitats with a contribution of 27.2%, whereas the pH and TOC, respectively, structured bacterial communities in weathered rocks and sediments. Alpha and beta diversities of bacterial communities increased with nitrate concentration in both habitats, with nitrate directly affecting alpha diversity in sediments, but indirectly on weathered rocks by lowering pH. Nitrate impacted more on bacterial communities in weathered rocks at the genus level than in sediments because more genera significantly correlated with nitrate concentration in weathered rocks. Diverse keystone taxa involved in nitrogen cycling were identified in the co-occurrence networks such as nitrate reducers, ammonium-oxidizers, and N2-fixers. Tax4Fun2 analysis further confirmed the dominance of genes involved in nitrogen cycling. Genes of methane metabolism and carbon fixation were also dominant. The dominance of dissimilatory and assimilatory nitrate reduction in nitrogen cycling substantiated nitrate impact on bacterial functions. Our results for the first time revealed the impact of nitrate on subsurface karst ecosystem in terms of bacterial compositions, interactions, and functions, providing an important reference for further deciphering the disturbance of human activities on the subsurface biosphere.

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“…This may be more common across anthracite biofilters compared to GAC biofilters. The variations in performance and additional analyses summarized in Evans et al, 2020 andMcCormick et al, 2021 conclude that while temperature is an important factor, other water quality and operational parameters, including pH, EBCT, and the timing and duration of biofilter shutdowns, also impact manganese removal across anthracite biofilters.…”

Section: Comparison Of Performance Of Anthracite and Gac Biofilters O...mentioning

confidence: 94%

Comparison of anthracite and GAC biofilter performance for surface‐water manganese removal

et al. 2022

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Alameda County Water District has observed increased biofilter effluent manganese concentrations during winter operations. To investigate manganese removal across surface water biofilters during cold-water conditions, trends were analyzed between water temperature and manganese removal across multiple testing scales, multiple biofilter influent water qualities, and both anthracite and GAC media. During acclimation of new biofilters, 100% removal of manganese was observed sooner across both anthracite and GAC biofilters brought online at 20 C compared to 12 C. Acclimation at 12 C required 18 extra days for the GAC biofilters and 48 additional days for the anthracite biofilters. For fully acclimated biofilters, a decrease in manganese removal across both GAC and anthracite biofilters at temperatures below 15 C was observed. However, greater and more consistent manganese removal was observed across GAC compared to anthracite biofilters. Performance differences between locations also suggest that operational and water quality conditions also likely affect manganese removal.

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Biological and physico-chemical mechanisms accelerating the acclimation of Mn-removing biofilters

Cited by 15 publications

References 37 publications

Acclimation, manganese removal, and backwash impact on full‐scale drinking water biofilter microbiome

Acclimation, manganese removal, and backwash impact on full‐scale drinking water biofilter microbiome

Nitrate determines the bacterial habitat specialization and impacts microbial functions in a subsurface karst cave

Comparison of anthracite and GAC biofilter performance for surface‐water manganese removal

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