Biodestruction of blended residual oxidant streams

Brown, Jess; Wheadon, Rick; Hansen, Edwin LeRoy

doi:10.1002/j.1551-8833.2010.tb10208.x

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…However, the biggest challenges of biological brine treatment remain acclimating salt‐tolerant bacteria in a hydrodynamically easy‐to‐operate reactor configuration and demonstrating their long‐term performance (Aldridge et al, 2004). Efficient biological treatment of perchlorate‐laden membrane concentrate has been demonstrated at the bench and pilot scale, and a 3.8‐mgd demonstration plant is now in operation (Brown et al, 2010). In this process, perchlorate‐laden electrodialysis reversal concentrate is blended with screened municipal wastewater and treated in a packed‐bed bioreactor using a 10‐minute empty bed contact time.…”

Section: Examining Perchlorate Removal Technologiesmentioning

confidence: 99%

Recent Research Every Utility Manager Needs to Know About

Speight¹,

Via²

2011

Journal AWWA

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Many utility managers do not have the time or funding to attend national conferences. Therefore, this article provides a way to highlight research findings that are of value in the daily operations of a utility. Being well‐informed about the advances in the field increases the value that a utility manager brings to his or her job each day. Research continues to improve the ability of conventional treatment processes to remove organic matter and other contaminants, such as arsenic. Inorganic contaminants, including nitrate, perchlorate, and ammonia, are a growing concern for many utilities. Biological treatment processes are emerging as a treatment option for inorganic contaminants and advances are improving removals with membrane and ion exchange technologies. Distribution system research has led to benchmarks for operations, better understanding of lead release, and characterization of microbial populations within pipe systems. Water utilities are entering the world of social media and implementing information technology advances such as cloud computing. Finally, for small systems in both developed and developing countries, research has demonstrated the value of operator training and performance‐based approaches in preventing disease.

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Section: Examining Perchlorate Removal Technologiesmentioning

confidence: 99%

Recent Research Every Utility Manager Needs to Know About

Speight¹,

Via²

2011

Journal AWWA

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“…2008; Webster et al. 2009); one full‐scale biological perchlorate treatment system currently operating in the United States removes perchlorate from electrodialysis reversal concentrate (Brown et al. 2010).…”

Section: Introductionmentioning

confidence: 99%

Quantification of genes and gene transcripts for microbial perchlorate reduction in fixed-bed bioreactors

Long

Bae

et al. 2012

Journal of Applied Microbiology

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Aims: Optimization of full‐scale, biological perchlorate treatment processes for drinking water would benefit from knowledge of the location and quantity of perchlorate‐reducing bacteria (PRB) and expression of perchlorate‐related genes in bioreactors. The aim of this study was to quantify perchlorate removal and perchlorate‐related genes (pcrA and cld) and their transcripts in bioreactors and to determine whether these genes or transcripts could serve as useful biomarkers for perchlorate treatment processes. Methods and Results: Quantitative PCR (qPCR) assays targeting pcrA and cld were applied to two pilot‐scale, fixed‐bed bioreactors treating perchlorate‐contaminated groundwater. pcrA and cld genes per microgram of DNA were two‐ to threefold higher and three‐ to fourfold higher, respectively, in the bioreactor showing superior perchlorate‐removal performance. In a laboratory‐scale bioreactor, quantities of pcrA and cld genes and transcripts were compared under two distinct performance conditions (c. 60 and 20% perchlorate removal) for a 5‐min empty bed contact time. cld genes per microgram of DNA were approximately threefold higher and cld transcripts per microgram of RNA were approximately sixfold higher under the higher perchlorate‐removal condition. No differences in pcrA genes or transcripts per microgram of DNA or RNA, respectively, were detected between the c. 60 and 20% perchlorate‐removal conditions, possibly because these assays did not accurately quantify pcrA genes and transcripts in the mixed culture present. Conclusions: Quantities of cld genes and transcripts per microgram of DNA and RNA, respectively, were found to be higher when perchlorate removal was higher. However, quantities of pcrA and cld genes or transcripts were not found to directly correlate with perchlorate‐removal rates. Significance and Impact of the Study: To our knowledge, this study represents the first application of qPCR assays to quantify perchlorate‐related genes and transcripts in continuous‐flow bioreactors. The results indicate that cld gene and transcript quantities can provide insights regarding the quantity, location and gene expression of PRB in bioreactors.

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Classical Writers on Love: the Contemporary Look

Djidaryan¹,

Maslova²

2018

ADP

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Biodestruction of blended residual oxidant streams

Cited by 3 publications

References 9 publications

Recent Research Every Utility Manager Needs to Know About

Recent Research Every Utility Manager Needs to Know About

Quantification of genes and gene transcripts for microbial perchlorate reduction in fixed-bed bioreactors

Classical Writers on Love: the Contemporary Look

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