Simultaneous biotreatment of hexavalent chromium Cr(VI) and polychlorinated biphenyls (PCBs) by indigenous bacteria of Co-polluted wastewater

Yasir, Muhammad; Capozzi, Staci L.; Kjellerup, Birthe V.; Shahid, Mohammad; Mahmood, Tariq; Khalid, Azeem

doi:10.1016/j.ibiod.2021.105249

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…The dominant genera of A1-a (the inlet section) showed in Fig 4(C) included Corynebacterium (8.31%), Acinetobacter [ 9 ] (1.15%) and Pseudomonas [ 33 ] (0.90%), which had been reported that they have Cr(VI) removal capability or participate in Cr(VI) removal [ 24 , 34 – 37 ]. Among them, Pseudomonas had also been found to play a significant role in denitrification [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Removal of Cr (VI) and microbial community analysis in PCB wastewater treatment based on the BESI® process

et al. 2023

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The treatment efficiency of Chromium (Cr)-containing Printed Circuit Board (PCB) wastewater is significantly hampered by the limited physiological activity of microorganisms when activated sludge is applied. In this study, the biodegradation and electron transfer based on sulfur metabolism in the integrated (BESI®) process use sulfur as the electron acceptor to achieve sulfate reduction and sulfide oxidation, leading to efficient removal of Cr. The concentrations of total Cr and Cr(VI) in the effluent were reduced to 0.5 mg/L and 0.1 mg/L, respectively, from an initial range of 25–32 mg/L in the influent. The removal of Cr (ΔC(Cr(VI))) mainly occurred in the Sulfate Reduction (SR) reactor, which was significantly correlated with the generation of sulphide (ΔC(S2−)) (R2 = 0.9987). Meantime, analysis of the microbial community showed that Cr (VI) stress increased the diversity of the bacterial community in sludge. The presence of Clostridium (52.54% and 47.78%) in SR & Sulfide Oxidation (SO) reactor, along with the Synergistaceae (31.90%) and Trichococcus (26.59%) in aerobic reactor, might contribute to the gradient degradation of COD, resulting in a removal efficiency exceeding 80% when treating an influent with a concentration of 1000 mg/L. In addition, the main precipitation components in the SR reactor were identified by scanning electron microscope, indicating that Cr has been removed from wastewater as Cr(OH)3 precipitation. This study sheds light on the potential of using the BESI® process for the real PCB wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Removal of Cr (VI) and microbial community analysis in PCB wastewater treatment based on the BESI® process

et al. 2023

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“…Based on these considerations, it is obvious that substantial efforts were deployed toward building environmentally friendly solutions for the treatment of chromium (VI). In this context, researchers developed biological methods making use plants and microorganisms to detoxify the environment (Xia et al, 2019 ; Yasir et al, 2021 ). Bacteria and fungi repeatedly demonstrated their ability to resist or remove Cr 6+ present in environmental or culture media (Chang et al, 2016 ; Kalsoom K. et al, 2021 ; Aké et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) removal performance from wastewater by microflora isolated from tannery effluents in a semi-arid environment: a SEM, EDX, FTIR and zeta potential study

Aké,

Rochdi,

Jemo

et al. 2024

Front. Microbiol.

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Hexavalent chromium removal from the environment remains a crucial worldwide challenge. To address this issue, microbiological approaches are amongst the straightforward strategies that rely mainly on the bacteria's and fungi's survival mechanisms upon exposure to toxic metals, such as reduction, efflux system, uptake, and biosorption. In this work, scanning electron microscopy, energy-dispersive X-ray spectrophotometry, Fourier transform infrared spectroscopy, and zeta potential measurements were used to investigate the ability of chromium adsorption by Bacillus licheniformis, Bacillus megaterium, Byssochlamys sp., and Candida maltosa strains isolated from tannery wastewater. Scanning electron microscopy combined with energy dispersive X-ray spectroscopy revealed alterations in the cells treated with hexavalent chromium. When exposed to 50 mg/L Cr6+, Bacillus licheniformis and Candida maltosa cells become rough, extracellular secretions are reduced in Bacillus megaterium, and Byssochlamys sp. cells are tightly bound and exhibit the greatest Cr weight percentage. In-depth analysis of Fourier transform infrared spectra of control and Cr-treated cells unveiled Cr-microbial interactions involving proteins, lipids, amino acids, and carbohydrates. These findings were supported by zeta potential measurements highlighting significant variations in charge after treatment with Cr(VI) with an adsorption limit of 100 mg/L Cr6+ for all the strains. Byssochlamys sp. showed the best performance in Cr adsorption, making it the most promising candidate for treating Cr-laden wastewater.

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“…Chromium(VI) has been widely used in industries, such as corrosion protection, textile, pigment manufacturing, leather tanning, and electroplating. , Chromium(VI) is a nonbiodegradable and toxic pollutant that can cause nausea, nervous disorder, kidney failure, and liver diseases. − Therefore, developing effective methods to remove chromium(VI) from wastewater is very important. Over the years, various technologies have been studied for removing chromium(VI), including chemical precipitation, membrane filtration, ion exchange, reverse osmosis, electrosorption, and so on. − …”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Chromium(VI) Using a Novel Waste Biomass Chestnut Shell-Based Carbon Electrode by Electrosorption

Zhang

Ren

et al. 2021

ACS Omega

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Biomass-derived porous carbon materials have a good application prospect in electrosorption because of their low cost, abundant natural resources, and excellent performance. In this work, three-dimensional interconnected structure porous carbon (CPC) was successfully synthesized from waste biomass chestnut shells by carbonization and chemical activation processes. The unique structure of CPC could offer superior double-layer capacitance and excellent conductivity. The as-obtained CPC was applied as an electrosorption electrode. In the deionization experiments, the removal efficiency of the CPC electrode in a 30 mg L–1 chromium(VI) aqueous solution at 1.0 V was 90.5%. The electrosorption follows pseudo-second-order kinetics. The CPC electrode also presented good regeneration performance in the regeneration test. These results demonstrate that the as-prepared carbonaceous material is an ideal material for capacitive deionization electrodes.

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Simultaneous biotreatment of hexavalent chromium Cr(VI) and polychlorinated biphenyls (PCBs) by indigenous bacteria of Co-polluted wastewater

Cited by 7 publications

References 47 publications

Removal of Cr (VI) and microbial community analysis in PCB wastewater treatment based on the BESI® process

Removal of Cr (VI) and microbial community analysis in PCB wastewater treatment based on the BESI® process

Cr(VI) removal performance from wastewater by microflora isolated from tannery effluents in a semi-arid environment: a SEM, EDX, FTIR and zeta potential study

Efficient Removal of Chromium(VI) Using a Novel Waste Biomass Chestnut Shell-Based Carbon Electrode by Electrosorption

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