Modeling the Biodegradation Kinetics of Perchlorate in the Presence of Oxygen and Nitrate as Competing Electron Acceptors

Farhan, Yassar H.; Hatzinger, Paul B.

doi:10.1080/10889860902902016

Cited by 28 publications

(9 citation statements)

References 23 publications

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“…In electron donor-limited environments, the presence of NO 3 À at greater concentrations has been shown to inhibit ClO 4 À reduction (Tan et al, 2004a;Farhan and Hatzinger, 2009). The capacity for ClO 4 À reduction appears to be common and has been demonstrated in a number of environments including Antarctic Dry Valley lakes (Jackson et al, 2012).…”

Section: Reduction Of Clomentioning

confidence: 99%

Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments

Jackson

Böhlke

Andraski

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Reduction Of Clomentioning

confidence: 99%

Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments

Jackson

Böhlke

Andraski

et al. 2015

Geochimica et Cosmochimica Acta

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“…In the NP system, insufficient TOC (∼9.21 mg/L) was available to completely reduce 10 mg/L of ClO 4 − , and thus, the degradation rate was slower than that observed in the ACP system, which used acetate as an electron donor (Farhan and Hatzinger 2009). Excessive acetate in the ACP system was first used for microbial growth, whereas the decrease in acetate reduced the inhibition on ClO 4 − degradation (Nozawa- "-" not detected All six perchlorate degradation systems (NP, ACP, HYP, PNI, PAM, and PNA) were divided into two stages, the lag stage (SI) and accelerated stage (SII).…”

Section: Effect Of Electron Donors and Co-contaminants On Clo 4 − Degmentioning

confidence: 81%

“…Azospira thrived in the heterotrophic ClO 4 − contaminant system, and grew using ClO 4 − and nitrate as an electron donor (Farhan and Hatzinger 2009;Sun et al 2009). Azospira was undoubtedly the most dominant bacteria, especially with the co-contaminants ClO 4 − , nitrate and ammonia.…”

Section: Effect Of Electron Donors and Co-contaminants On Clo 4 − Degmentioning

confidence: 98%

Electron donors and co-contaminants affect microbial community composition and activity in perchlorate degradation

Guan

Xie

Wang

et al. 2014

Environ Sci Pollut Res

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Although microbial reduction of perchlorate (ClO4(-)) is a promising and effective method, our knowledge on the changes in microbial communities during ClO4(-) degradation is limited, especially when different electron donors are supplied and/or other contaminants are present. Here, we examined the effects of acetate and hydrogen as electron donors and nitrate and ammonium as co-contaminants on ClO4(-) degradation by anaerobic microcosms using six treatments. The process of degradation was divided into the lag stage (SI) and the accelerated stage (SII). Quantitative PCR was used to quantify four genes: pcrA (encoding perchlorate reductase), cld (encoding chlorite dismutase), nirS (encoding copper and cytochrome cd1 nitrite reductase), and 16S rRNA. While the degradation of ClO4(-) with acetate, nitrate, and ammonia system (PNA) was the fastest with the highest abundance of the four genes, it was the slowest in the autotrophic system (HYP). The pcrA gene accumulated in SI and played a key role in initiating the accelerated degradation of ClO4(-) when its abundance reached a peak. Degradation in SII was primarily maintained by the cld gene. Acetate inhibited the growth of perchlorate-reducing bacteria (PRB), but its effect was weakened by nitrate (NO3(-)), which promoted the growth of PRB in SI, and therefore, accelerated the ClO4(-) degradation rate. In addition, ammonia (NH4(+)), as nitrogen sources, accelerated the growth of PRB. The bacterial communities' structure and diversity were significantly affected by electron donors and co-contaminants. Under heterotrophic conditions, both ammonia and nitrate promoted Azospira as the most dominant genera, a fact that might significantly influence the rate of ClO4(-) natural attenuation by degradation.

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“…Nitrate reduction often precedes perchlorate reduction, thereby resulting in a perchlorate reduction lag period (Nozawa‐Inoue et al ). Some studies have shown that nitrate can even prevent or inhibit enzymatic expression by some PRB (Chaudhuri et al ; Coates and Achenbach ; Farhan and Hatzinger ). On the other hand, some studies have shown that nitrate will indeed cause a perchlorate reduction lag period, but higher nitrate to perchlorate molar ratios will actually lead to more rapid perchlorate reduction kinetics following the lag period (Nozawa‐Inoue et al ).…”

Section: Resultsmentioning

confidence: 99%

Biological Reduction of Nitrate and Perchlorate in Soil Microcosms: An Electron Donor Comparison of Glycerol, Emulsified Oil, and Mulch Extract

Sarria¹,

Gonzales²,

Gerrity³

et al. 2018

Groundwater Monitoring Rem

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Diverse technologies have been developed and tested for their efficacy in remediating perchlorate‐contaminated surface water, groundwater, and soil. Biological reduction, particularly when coupled with electron donor augmentation, has been shown to be one of the most cost‐effective alternatives. Numerous electron donors have been evaluated in the literature, but few studies have compared standard vs. slow‐release electron donors for sequential nitrate and perchlorate reduction. This study evaluated the efficacy and kinetics of biological reduction in soil microcosms augmented with emulsified oil (EO), glycerol, and mulch extract. Results indicated that EO and glycerol spiked at approximately 100 times stoichiometric excess (i.e., 100x) achieved similar overall reductions and degradation rates for nitrate and perchlorate, although nitrate appeared to exhibit zero order kinetics while perchlorate exhibited first order kinetics. The zero order rate constants for nitrate reduction were 3.32 mg/L d and 2.57 mg/L d for EO and glycerol, respectively. The first order rate constant for perchlorate reduction was 0.36 day−1 for both EO and glycerol. Stable chemical oxygen demand (COD) concentrations also highlighted the slow‐release properties of EO, which would reduce electron donor consumption in comparison to soluble substrates in soil remediation applications. The microcosms augmented with mulch extract failed to demonstrate any nitrate or perchlorate reduction due to the extract's lower COD concentration. Augmentation with compost or additional processing (i.e., concentration) would be necessary to make the extract a viable alternative.

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Modeling the Biodegradation Kinetics of Perchlorate in the Presence of Oxygen and Nitrate as Competing Electron Acceptors

Cited by 28 publications

References 23 publications

Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments

Global patterns and environmental controls of perchlorate and nitrate co-occurrence in arid and semi-arid environments

Electron donors and co-contaminants affect microbial community composition and activity in perchlorate degradation

Biological Reduction of Nitrate and Perchlorate in Soil Microcosms: An Electron Donor Comparison of Glycerol, Emulsified Oil, and Mulch Extract

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