Using upstream oxidants to minimize surface biofouling and improve hydraulic performance in GAC biofilters

Vera, de; Lauderdale, Chance; Alito, Christina L.; Hooper, Jennifer; Wert, Eric C.

doi:10.1016/j.watres.2018.10.085

Cited by 12 publications

(4 citation statements)

References 35 publications

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“…Consequently, frequent chlorination of the pre-treatment is believed to be the main reason for the loss in activity of the biofilm layer, as chlorination is applied weekly in the seawater intake (Li et al 2017b, De Vera et al 2019. Consequently, free chlorine reaches the media filtration, as can be seen based on microbial ATP monitoring (Fig.…”

Section: Removal Efficiency Of Fouling Potential In Dmf Pretreatmentmentioning

confidence: 96%

Assessing Bacterial Growth Potential in Seawater Reverse Osmosis Pretreatment: Method Development and Applications

Abushaban¹

2019

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I would like to express my gratitude and appreciation to all individuals who contributed to the success of this thesis. All things are possible through collaboration. Foremost, I would like to express my sincere gratitude to my promoter, Prof. Maria D. Kennedy for giving me the opportunity to carry on my academic career and for her strong support, wise guidance, encouragement and brilliant advice throughout the research study. I am also thankful to my supervisors, Sergio Salinas-Rodriguez for his support, guidance, assistance, availability, time, and patience and to Prof. Jan C. Schippers for teaching me view things in a broad way and his advice and critical discussions and suggestions.

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Section: Removal Efficiency Of Fouling Potential In Dmf Pretreatmentmentioning

confidence: 96%

Assessing Bacterial Growth Potential in Seawater Reverse Osmosis Pretreatment: Method Development and Applications

Abushaban¹

2019

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“…Moreover, too short an EBCT is not likely to be the cause because higher removal of both BGP and organic matter were measured in another DMF pretreatment system in the full-scale SWRO plant described below (in the following section), with a similar EBCT. Consequently, frequent chlorination of the pretreatment could have been the main reason for the loss in activity of the biofilm layer, as chlorination is applied weekly in the seawater intake [42,43]. Therefore, free chlorine reaches the media filtration and destroys the biofilm layers on the filter media, as discussed earlier.…”

Section: Monitoring Of Dmf First Stage Over Timementioning

confidence: 95%

Assessing Pretreatment Effectiveness for Particulate, Organic and Biological Fouling in a Full-Scale SWRO Desalination Plant

et al. 2021

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In this study, the removal of particulate, organic and biological fouling potential was investigated in the two-stage dual media filtration (DMF) pretreatment of a full-scale seawater reverse osmosis (SWRO) desalination plant. Moreover, the removal of fouling potential in two-stage DMF (DMF pretreatment) was compared with the removal in two-stage DMF installed after dissolved air floatation (DAF) (DAF-DMF pretreatment). For this purpose, the silt density index (SDI), modified fouling index (MFI), bacterial growth potential (BGP), organic fractions and microbial adenosine triphosphate (ATP) were monitored in the pretreatment processes of two full-scale SWRO plants. Particulate fouling potential was well controlled through the two stages of DMF with significant removal of SDI15 (>80%), MFI0.45 (94%) and microbial ATP (>95%). However, lower removal of biological/organic fouling potential (24–41%) was observed due to frequent chlorination (weekly) of the pretreatment, resulting in low biological activity in the DMFs. Therefore, neutralizing chlorine before media filtration is advised, rather than after, as is the current practice in many full-scale SWRO plants. Comparing overall removal in the DAF-DMF pretreatment to that of the DMF pretreatment showed that DAF improved the removal of biological/organic fouling potential, in which the removal of BGP and biopolymers increased by 40% and 16%, respectively. Overall, monitoring ATP and BGP during the pretreatment processes, particularly in DMF, would be beneficial to enhance biological degradation and lower biofouling potential in SWRO feed water.

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“…GACF is applied to further remove chemical and biological hazards that can break through the RSF and the following ozonation barriers. Usually, water is first treated by ozone after RSF and then by GACF at a relatively fast flow rate (6−7.5 m/h) (World Health Organization 2017 ; Brandt et al 2017 ; de Vera et al 2019 ).…”

Section: Biofilters In the Drinking Water Treatment Processmentioning

confidence: 99%

“…In the last decades, GACF has been observed to effectively remove a wide range of CECs (e.g. 22 to > 80% of 16 studied CECs including pharmaceutical residues, pesticides, and fire retardant) and assimilable organic carbon (AOC) (39−74%) associated with microbial stability of water (Wang et al 2013 ; World Health Organization 2017 ; Zhang et al 2017 ; Greenstein et al 2018 ; de Vera et al 2019 ; Pick et al 2019 ) (Table S3 ). Regarding microbial contaminants, GACF removes protozoan (oo)cyst (1.0−2.3 log 10 ) such as Cryptosporidium parvum and Giardia lamblia .…”

Section: Biofilters In the Drinking Water Treatment Processmentioning

confidence: 99%

Microbial ecology of biofiltration used for producing safe drinking water

Dinkla²,

Muyzer

2022

Appl Microbiol Biotechnol

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Biofiltration is a water purification technology playing a pivotal role in producing safe drinking water. This technology attracts many interests worldwide due to its advantages, such as no addition of chemicals, a low energy input, and a high removal efficiency of organic compounds, undesirable taste and odours, and pathogens. The current review describes the microbial ecology of three biofiltration processes that are routinely used in drinking water treatment plants, i.e. (i) rapid sand filtration (RSF), (ii) granular activated carbon filtration (GACF), and (iii) slow sand filtration (SSF). We summarised and compared the characteristics, removal performance, and corresponding (newly revealed) mechanisms of the three biofiltration processes. Specifically, the microbial ecology of the different biofilter processes and the role of microbial communities in removing nutrients, organic compounds, and pathogens were reviewed. Finally, we highlight the limitations and challenges in the study of biofiltration in drinking water production, and propose future perspectives for obtaining a comprehensive understanding of the microbial ecology of biofiltration, which is needed to promote and optimise its further application. Key points • Biofilters are composed of complex microbiomes, primarily shaped by water quality. • Conventional biofilters contribute to address safety challenges in drinking water. • Studies may underestimate the active/functional role of microbiomes in biofilters.

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Using upstream oxidants to minimize surface biofouling and improve hydraulic performance in GAC biofilters

Cited by 12 publications

References 35 publications

Assessing Bacterial Growth Potential in Seawater Reverse Osmosis Pretreatment: Method Development and Applications

Assessing Bacterial Growth Potential in Seawater Reverse Osmosis Pretreatment: Method Development and Applications

Assessing Pretreatment Effectiveness for Particulate, Organic and Biological Fouling in a Full-Scale SWRO Desalination Plant

Microbial ecology of biofiltration used for producing safe drinking water

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