Mechanism and Kinetics of Hexavalent Chromium Chemical Reduction with Sugarcane Molasses

Chen, Zifang; Zhao, Yongsheng; Zhang, Jiawen; Bai, Jing

doi:10.1007/s11270-015-2629-6

Cited by 21 publications

(12 citation statements)

References 43 publications

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“…Sugarcane molasses has been successfully used in the remediation of groundwater contaminated Cr(VI) as a kind of organic materials. It was demonstrated that sugarcane molasses could reduce Cr(VI) to Cr(III) by chemical reduction and microbial reduction (Chen et al 2015(Chen et al , 2016. Chen et al (2017) discussed the reaction pathways and dynamics of chemical reduction of Cr(VI), and the reducing reaction of Cr(VI) could be described by a pseudo-first-order kinetic model.…”

Section: Introductionmentioning

confidence: 99%

Influence of pH on Cr(VI) reduction by organic reducing substances from sugarcane molasses

Yan

Chen

2019

Appl Water Sci

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The remediation of Cr(VI) is one of the hot issues in groundwater pollution remediation. The influences and effects of pH on Cr(VI) reduction by organic reducing substances in sugarcane molasses were studied under the sterilization and unsterilization conditions by means of batch laboratory-scale experiments. The results showed that pH of reaction solution has a great influence on the reduction of Cr(VI) by sugarcane molasses. When pH ≥ 3.0, the final removal efficiency of Cr(VI) on the condition of sterilization and unsterilization at pH values of 8.0, 5.8, 4.0 and 3.0 was 15.441%, 17.945%, 29.205%, 36.258% and 99.236%, and 98.577%, 99.235% and 99.368%, respectively. When pH < 3.0, the final removal efficiency of Cr(VI) on the condition of sterilization and unsterilization at pH values of 2.5 and 2.0 was 99.631% and 99.895%, and 99.631% and 99.895%, respectively. The main mechanism involves chemical reduction and biological reduction. And biological reduction in the process of Cr(VI) reduction by sugarcane molasses is of the first priority when pH ≥ 3.0; when pH < 3.0, the rate of chemical reduction was higher and it was not the basic existing biological reduction. The relationship between pH and pseudo-first-order rate constant (k obs) on both the sterilization and unsterilization conditions was satisfied with Boltzmann model. There is an inflection point at the pH of about 2.6, which also indicated the influence mechanism of pH on the reduction of Cr(VI) by sugarcane molasses.

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Section: Introductionmentioning

confidence: 99%

Influence of pH on Cr(VI) reduction by organic reducing substances from sugarcane molasses

Yan

Chen

2019

Appl Water Sci

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“…Recent experimental results (Chen et al, 2015;Hansen et al, 2016) have established a rapid direct redox reaction when molasses is used as an electron donor and Cr(VI) is the contaminant, rather than the bio-mediated reaction previously posited. It is thus crucial to include this behavior in a model aimed at remediation design.…”

Section: Abiotic Reaction Of Electron Donor and Contaminantmentioning

confidence: 99%

“…Bioprecipitation, a process by which microbiological exudates react with metals to produce an insoluble compound, has been widely observed (Malik, 2004;Van Roy et al, 2006;Radhika et al, 2006) and has been noted by Wu et al (2010) as a remediation method. Bio-stimulants have also recently been shown to effectively reduce chromium through abiotic oxidation-reduction (redox) pathways (Chen et al, 2015;Hansen et al, 2016) and, after fermentation, for other metals (Hashim et al, 2011). Naturally, designing a remedial intervention using one of this family of techniques benefits greatly from the use of a multi-dimensional/multicomponent numerical model of groundwater flow, contaminant transport, and biogeochemical processes to evaluate different remediation strategies under varying field conditions.…”

Section: Introductionmentioning

confidence: 99%

CHROTRAN 1.0: A mathematical and computational model for in situ heavy metal remediation in heterogeneous aquifers

et al. 2017

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Abstract. Groundwater contamination by heavy metals is a critical environmental problem for which in situ remediation is frequently the only viable treatment option. For such interventions, a multi-dimensional reactive transport model of relevant biogeochemical processes is invaluable. To this end, we developed a model, CHROTRAN, for in situ treatment, which includes full dynamics for five species: a heavy metal to be remediated, an electron donor, biomass, a nontoxic conservative bio-inhibitor, and a biocide. Direct abiotic reduction by donor-metal interaction as well as donor-driven biomass growth and bio-reduction are modeled, along with crucial processes such as donor sorption, bio-fouling, and biomass death. Our software implementation handles heterogeneous flow fields, as well as arbitrarily many chemical species and amendment injection points, and features full coupling between flow and reactive transport. We describe installation and usage and present two example simulations demonstrating its unique capabilities. One simulation suggests an unorthodox approach to remediation of Cr(VI) contamination.

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“…However, costs for some of these feedstocks (which serve as an electron donor) might become prohibitive in actual field applications. The use of industrial-grade molasses may provide a more cost-effective alternative to any of the above-mentioned carbon and energy sources [21][22][23][24][25]. According to the literature, the treatment cost when using molasses (0.13 € (Kg molasses) −1 in Greece) amounts to about 0.39 € (m −3 of wastewater) [25].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Treatment of Agro-Industrial and Industrial Wastewaters: Case Studies of Cr(VI)/Second Cheese Whey and Cr(VI)/Winery Effluents

Tatoulis

Michailides

Tekerlekopoulou

et al. 2018

Water

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Hexavalent chromium (Cr(VI)) was co-treated either with second cheese whey (SCW) or winery effluents (WE) using pilot-scale biological trickling filters in series under different operating conditions. Two pilot-scale filters in series using plastic support media were used in each case. The first filter (i.e., Cr-SCW-filter or Cr-WE-filter) aimed at Cr(VI) reduction and the partial removal of dissolved chemical oxygen demand (d-COD) from SCW or WE and was inoculated with indigenous microorganisms originating from industrial sludge. The second filter in series (i.e., SCW-filter or WE-filter) aimed at further d-COD removal and was inoculated with indigenous microorganisms that were isolated from SCW or WE. Various Cr(VI) (5-100 mg L −1) and SCW or WE (d-COD, 1000-25,000 mg L −1) feed concentrations were tested. Based on the experimental results, the sequencing batch reactor operating mode with recirculation of 0.5 L min −1 proved very efficient since it led to complete Cr(VI) reduction in the first filter in series and achieved high Cr(VI) reduction rates (up to 36 and 43 mg L −1 d −1 , for SCW and WW, respectively). Percentage d-COD removal for SCW and WE in the first filter was rather low, ranging from 14 to 42.5% and from 4 to 29% in the Cr-SCW-filter and Cr-WE-filter, respectively. However, the addition of the second filter in series enhanced total d-COD removal to above 97% and 90.5% for SCW and WE, respectively. The above results indicate that agro-industrial wastewater could be used as a carbon source for Cr(VI) reduction, while the use of two trickling filters in series could effectively treat both industrial and agro-industrial wastewaters with very low installation and operational costs.

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Mechanism and Kinetics of Hexavalent Chromium Chemical Reduction with Sugarcane Molasses

Cited by 21 publications

References 43 publications

Influence of pH on Cr(VI) reduction by organic reducing substances from sugarcane molasses

Influence of pH on Cr(VI) reduction by organic reducing substances from sugarcane molasses

CHROTRAN 1.0: A mathematical and computational model for in situ heavy metal remediation in heterogeneous aquifers

Simultaneous Treatment of Agro-Industrial and Industrial Wastewaters: Case Studies of Cr(VI)/Second Cheese Whey and Cr(VI)/Winery Effluents

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