Kinetics of bioreduction of hexavalent chromium by poly vinyl alcohol-alginate immobilized cells of Ochrobactrum sp. Cr-B4 and comparison with free cells

Hora, Anuradha; Shetty, Vidya K.

doi:10.1080/19443994.2015.1030704

Cited by 12 publications

(3 citation statements)

References 26 publications

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“…PVA-CA was also used to entrap the cells of Ochrobactrum sp. applied in removing of Cr (VI) in the previous study [181]. The overall removal rate of Cr (VI) was similar for free cells and entrapped cells.…”

Section: Note: Different Letters Indicate Statistical Differences (P<...supporting

confidence: 56%

“…The overall removal rate of Cr (VI) was similar for free cells and entrapped cells. However, the more beneficiary of entrapped cells is that it could be applied in high concentration of Cr (VI) and the entrapped cells could be used several times [181]. The inhibitory kinetics results indicated that the entrapped cells using BA, PVA, and PVA-BA could alleviate harmful effect of AgNPs and Ag + via observing ammonia oxidation activity.…”

Section: Note: Different Letters Indicate Statistical Differences (P<...mentioning

confidence: 99%

“…showing good performance in chromium removal [181], but it has not been tested with removal of ammonia under presence of AgNPs and Ag + .…”

Section: Introductionmentioning

confidence: 99%

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Ammonia oxidation process of entrapped and suspended cell inhibited by silver nanoparticles

Giao

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Silver nanoparticles (AgNPs) are widely used in commercial products because of their excellent antimicrobial activity. Entrance of AgNPs and its released Ag ions (Ag+) into wastewater treatment plants could harm ammonia oxidation (AO) process resulting in environmental problems. This study aimed to study inhibitory effect of AgNPs and Ag+ on AO process in suspended cells of ammonia oxidizing cultures enriched at initial ammonia concentrations of 0.5 and 30 mM (called NAS 0.5 mM and NAS 30 mM, respectively) and then mitigation measures using entrapment technique were tested. The results indicated that AgNPs and Ag+ were higher toxic to NAS 0.5 mM than NAS 30 mM due to different proportion of active ammonia oxidizers and communities. Silver nanoparticles of 1-100 mg/L inhibited AO activity by 90.6 ± 8.6% to 94.8 ± 4.3% and 44.9 ± 2.4% to 73.8 ± 1.5%, whereas Ag+ concentration of 0.05- 0.50 mg/L inhibited by 86.3 ± 0.8% to 93.4 ± 1.24% and 52.7 ± 2.14% to 93.9 ± 1.89% for NAS 0.5 mM and NAS 30 mM, respectively. The inhibition result suggested that the AgNP toxicity mainly derived from the liberated Ag+. The primary mechanism for toxicity of AgNPs and Ag+ caused microbial cell death. Cell entrapped in barium alginate (BA), polyvinyl alcohol (PVA), and the mixture of PVA-BA used to mitigate negative influence of AgNPs and Ag+. The results showed that BA, PVA, and PVA-BA- entrapped cells remained AO 81-100%, 57-97%, and 75-100% at AgNPs 1-100 mg/L whereas the entrapped cells remained AO 98-100%, 61-99%, and 79-100% under Ag+ 0.05-0.50 mg/L, respectively. Less damage of membrane integrity in the entrapped cells experiments with AgNPs and Ag+ indicated that the entrapped cells were less exposed to silver since the entrapment matrices could limit mass transfer of silver into the gel beads. BA and PVA-BA were highly recommended for further study in the mitigating toxicity of AgNPs and Ag+ since they remained high cell viability and more stable in synthetic wastewater.

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Section: Note: Different Letters Indicate Statistical Differences (P<...supporting

confidence: 56%

Section: Note: Different Letters Indicate Statistical Differences (P<...mentioning

confidence: 99%

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Ammonia oxidation process of entrapped and suspended cell inhibited by silver nanoparticles

Giao

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Immobilized Microbial Biosorbents for Wastewater Remediation

Laskar

Kumar

Barakat

2017

Advanced Materials for Wastewater Treatment

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Microbial Remediation Technologies for Chromium Removal: Mechanism, Challenges and Future Prospect

Monga,

Fulke,

Giripunje

et al. 2023

Environmental Science and Engineering

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Kinetics of bioreduction of hexavalent chromium by poly vinyl alcohol-alginate immobilized cells of Ochrobactrum sp. Cr-B4 and comparison with free cells

Cited by 12 publications

References 26 publications

Ammonia oxidation process of entrapped and suspended cell inhibited by silver nanoparticles

Ammonia oxidation process of entrapped and suspended cell inhibited by silver nanoparticles

Immobilized Microbial Biosorbents for Wastewater Remediation

Microbial Remediation Technologies for Chromium Removal: Mechanism, Challenges and Future Prospect

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