Factors affecting removal of NDMA in an ozone-biofiltration process for water reuse

Vaidya, Ramola; Wilson, Christopher; Salazar‐Benites, Germano; Pruden, Amy; Bott, Charles

doi:10.1016/j.chemosphere.2020.128333

Cited by 14 publications

(13 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BAF provides many treatment benefits, such as increasing the biological stability of water and the degradation of other trace organic compounds, especially when combined with ozonation before BAF. BAF has been shown to remove a range of contaminants, including disinfection by product precursors, tris(chloropropyl) phosphate, tris(2-carboxyethyl) phosphine, N -nitrosodimethylamine, formaldehyde, and acetone. ,,, …”

Section: Discussionmentioning

confidence: 99%

“…The granular activated carbon had been previously exhausted by membrane bioreactor effluent until consistent total organic carbon (TOC) removal was observed. These BAFs had then been operated for 4 years in a potable reuse pilot treatment plant prior to the start of this study by Vaidya et al , Each pilot BAF was operated at a constant empty bed contact time of 10 min and was backwashed when either turbidity exceeded 0.15 NTU or head loss exceeded 3 m.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Cometabolic Treatment of 1,4-Dioxane in Biologically Active Carbon Filtration with Tetrahydrofuran and Propane at Relevant Concentrations for Potable Reuse

Stohr

Vaidya²,

Wilson

et al. 2023

ACS EST Water

Self Cite

View full text Add to dashboard Cite

1,4-Dioxane is a probable human carcinogen and a widely occurring water contaminant. Cometabolic biodegradation of 1,4-dioxane could potentially provide a cost-effective and efficient treatment, but research is needed to establish its viability for water reuse purposes. The purpose of this study was to compare propane versus tetrahydrofuran as cometabolites for enhancing the removal of 1,4-dioxane via biologically active carbon filtration (BAF) as part of a pilot-scale water reuse system. Removal of 10, 5, 1, and 0.3 μg/L of 1,4-dioxane by BAF was examined in systems amended with either propane (2 mg/L) or tetrahydrofuran (25–50 μg/L), receiving the same ozonated, secondary wastewater effluent. At the lowest influent 1,4-dioxane concentration (0.3 μg/L), the tetrahydrofuran amended filter removed on average 58% ± 4% (std dev) of the incoming 1,4-dioxane. During the same period, the propane amended filter removed on average 74% ± 7% of the incoming 1,4-dioxane and at times degraded the 1,4-dioxane to below the method detection limit of 0.06 μg/L. This study demonstrates that amending cometabolites prior to BAF is a feasible treatment technique for removal of 1,4-dioxane occurring at submicrogram per liter concentrations and thus holds promise for both potable reuse applications and drinking water treatment.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Cometabolic Treatment of 1,4-Dioxane in Biologically Active Carbon Filtration with Tetrahydrofuran and Propane at Relevant Concentrations for Potable Reuse

Stohr

Vaidya²,

Wilson

et al. 2023

ACS EST Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ozone also provides the benefit of efficiently oxidizing trace organic contaminants (TrOCs). , The primary drawback to ozone application is the formation of disinfection byproducts (DBPs) such as bromate, aldehydes, and nitrosamines such as NDMA. − This is a challenge in water reuse applications, where the concentration of precursor compounds is elevated. Many DBPs formed during ozonation are biodegradable in downstream biofiltration (e.g., NDMA); however, bromate is not. Therefore, bromate is of particular concern due to the 10 μg/L maximum contaminant level (MCL) put in place by the United States EPA and the World Health Organization. , Common bromate control methods used in water treatment include pH suppression and ammonia addition; however, these are often insufficient in wastewater treatment applications where bromide is elevated and hydroxyl radical (*OH) bromate formation pathways dominate .…”

Section: Introductionmentioning

confidence: 99%

“…16−18 This is a challenge in water reuse applications, where the concentration of precursor compounds is elevated. Many DBPs formed during ozonation are biodegradable in downstream biofiltration (e.g., NDMA 19 ); however, bromate is not. Therefore, bromate is of particular concern due to the 10 μg/L maximum contaminant level (MCL) put in place by the United States EPA and the World Health Organization.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Ozone Disinfection in Water Reuse: Controlling Bromate Formation and Enhancing Trace Organic Contaminant Oxidation

Hogard

Pearce

González

et al. 2023

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

The use of ozone/biofiltration advanced treatment has become more prevalent in recent years, with many utilities seeking an alternative to membrane/ RO based treatment for water reuse. Ensuring efficient pathogen reduction while controlling disinfection byproducts and maximizing oxidation of trace organic contaminants remains a major barrier to implementing ozone in reuse applications. Navigating these challenges is imperative in order to allow for the more widespread application of ozonation. Here, we demonstrate the effectiveness of ozone for virus, coliform bacteria, and spore forming bacteria inactivation in unfiltered secondary effluent, all the while controlling the disinfection byproduct bromate. A greater than 6-log reduction of both male specific and somatic coliphages was seen at specific ozone doses as low as 0.75 O 3 :TOC. This study compared monochloramine and hydrogen peroxide as chemical bromate control measures in high bromide water (Br − = 0.35 ± 0.07 mg/L). On average, monochloramine and hydrogen peroxide resulted in an 80% and 36% decrease of bromate formation, respectively. Neither bromate control method had any appreciable impact on virus or coliform bacteria disinfection by ozone; however, the use of hydrogen peroxide would require a non-Ct disinfection framework. Maintaining ozone residual was shown to be critical for achieving disinfection of more resilient microorganisms, such as spore forming bacteria. While extremely effective at controlling bromate, monochloramine was shown to inhibit TrOC oxidation, whereas hydrogen peroxide enhanced TrOC oxidation.

show abstract

“…Biofiltration is the alternative technique, which is a biological process requiring low maintenance cost, is more effective, generates lower amounts of harmful byproducts, and has a wide variety (range) of applications . Its performance can be affected by changing temperature, moisture content, and discontinuous pollutant supplies. − The removal efficiencies for H 2 S degeneration are, for the most part, comparable to VOC contaminates; the convergences of specific VOC types are inferior. − …”

Section: Introductionmentioning

confidence: 99%

Air Pollutants Removal Using Biofiltration Technique: A Challenge at the Frontiers of Sustainable Environment

et al. 2022

View full text Add to dashboard Cite

Air pollution is a central problem faced by industries during the production process. The control of this pollution is essential for the environment and living organisms as it creates harmful effects. Biofiltration is a current pollution management strategy that concerns removing odor, volatile organic compounds (VOCs), and other pollutants from the air. Recently, this approach has earned vogue globally due to its low-cost and straightforward technique, effortless function, high reduction efficacy, less energy necessity, and residual consequences not needing additional remedy. There is a critical requirement to consider sustainable machinery to decrease the pollutants arising within air and water sources. For managing these different kinds of pollutant reductions, biofiltration techniques have been utilized. The contaminants are adsorbed upon the medium exterior and are metabolized to benign outcomes through immobilized microbes. Biofiltration-based designs have appeared advantageous in terminating dangerous pollutants from wastewater or contaminated air in recent years. Biofiltration uses the possibilities of microbial approaches (bacteria and fungi) to lessen the broad range of compounds and VOCs. In this review, we have discussed a general introduction based on biofiltration and the classification of air pollutants based on different sources. The history of biofiltration and other mechanisms used in biofiltration techniques have been discussed. Further, the crucial factors of biofilters that affect the performance of biofiltration techniques have been discussed in detail. Finally, we concluded the topic with current challenges and future prospects.

show abstract

Factors affecting removal of NDMA in an ozone-biofiltration process for water reuse

Cited by 14 publications

References 44 publications

Cometabolic Treatment of 1,4-Dioxane in Biologically Active Carbon Filtration with Tetrahydrofuran and Propane at Relevant Concentrations for Potable Reuse

Cometabolic Treatment of 1,4-Dioxane in Biologically Active Carbon Filtration with Tetrahydrofuran and Propane at Relevant Concentrations for Potable Reuse

Optimizing Ozone Disinfection in Water Reuse: Controlling Bromate Formation and Enhancing Trace Organic Contaminant Oxidation

Air Pollutants Removal Using Biofiltration Technique: A Challenge at the Frontiers of Sustainable Environment

Contact Info

Product

Resources

About