Enhanced bioremediation of pulp effluents through improved enzymatic treatment strategies: A greener approach

Dixit, Mandeep; Gupta, Guddu Kumar; Usmani, Zeba; Sharma, Minaxi; Shukla, Pratyoosh

doi:10.1016/j.rser.2021.111664

Cited by 28 publications

(6 citation statements)

References 82 publications

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“…The cellulases obtained from microbes can be used in large scale for bioremediation of cellulosic wastes (Dixit et al), 133 for large-scale cellulosic substrate conversions into value-added products, e.g., biofuels (Ahmad et al), 129 biofertilizers (Yu et al), 134 animal feed (Azizi-Shotorkhoft et al), 135 pulp and paper (Karthika et al), 136 textile (Bussler et al). 137 As the study deals with the employment of native cellulolytic bacterial isolates, metabolic engineering can further enhance the cellulolytic and ethanologenic abilities of the microbes.…”

Section: Discussionmentioning

confidence: 99%

Cellulolytic and Ethanologenic Evaluation of Heterotermes indicola’s Gut-Associated Bacterial Isolates

Azhar,

Aihetasham,

Chaudhary

et al. 2024

ACS Omega

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Cellulose is the basic component of lignocellulosic biomass (LCB) making it a suitable substrate for bioethanol fermentation. Cellulolytic and ethanologenic bacteria possess cellulases that convert cellulose to glucose, which in turn yields ethanol subsequently. Heterotermes indicola is a subterranean termite that causes destructive damage by consuming wooden structures of infrastructure, LCB products, etc. Prospectively, the study envisioned the screening of cellulolytic and ethanologenic bacteria from the termite gut. Twenty six bacterial strains (H1− H26) based on varied colonial morphologies were isolated. Bacterial cellulolytic activity was tested biochemically. Marked gas production in the form of bubbles (0.1−4 cm) in Durham tubes was observed in H3, H7, H13, H15, H17, H21, and H22. Sugar degradation of all isolates was indicated by pink to maroon color development with the tetrazolium salt. Hallow zones (0.42−11 mm) by Congo red staining was exhibited by all strains except H2, H7, H8, and H19. Among the 26 bacterial isolates, 12 strains were identified as efficient cellulolytic bacteria. CMCase activity and ethanol titer of all isolates varied from 1.30 ± 0.03 (H13) to 1.83 ± 0.01 (H21) umol/mL/min and 2.36 ± 0.01 (H25) to 7.00 ± 0.01 (H21) g/L, respectively. Likewise, isolate H21 exhibited an ethanol yield of 0.40 ± 0.10 g/g with 78.38 ± 2.05% fermentation efficiency. Molecular characterization of four strains, Staphylococcus sp. H13, Acinetobacter baumanni H17, Acinetobacter sp. H21, and Acinetobacter nosocomialis H22, were based on the maximum cellulolytic index and the ethanol yield. H. indicola harbor promising and novel bacteria with a natural cellulolytic tendency for efficient bioconversion of LCB to value-added products. Hence, the selected cellulolytic bacteria can become an excellent addition for use in enzyme purification, composting, and production of biofuel at large.

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Section: Discussionmentioning

confidence: 99%

Cellulolytic and Ethanologenic Evaluation of Heterotermes indicola’s Gut-Associated Bacterial Isolates

Azhar,

Aihetasham,

Chaudhary

et al. 2024

ACS Omega

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“…The conversion made through thermochemical and biochemical processes are two of the most crucial processes in the transformation of algal biomass into viable biofuels. The biochemical conversion, in which bacteria are used to create biofuels from biomass, is in contrast to the thermochemical conversion, which uses heat to break down the organic components of the biomass [ 68 ]. Among several distinct approaches, Gasification is creating explosive gas combinations from biomass by heating the material at higher temperatures (800–1000°C) with less oxygen present.…”

Section: Microalgal Biomass To Bioenergy Conversionmentioning

confidence: 99%

Bioengineering strategies of microalgae biomass for biofuel production: recent advancement and insight

Sundaram,

Rajendran,

Gnanasekaran

et al. 2023

Bioengineered

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Algae-based biofuel developed over the past decade has become a viable substitute for petroleum-based energy sources. Due to their high lipid accumulation rates and low carbon dioxide emissions, microalgal species are considered highly valuable feedstock for biofuel generation. This review article presented the importance of biofuel and the flaws that need to be overcome to ensure algae-based biofuels are effective for future-ready bioenergy sources. Besides, several issues related to the optimization and engineering strategies to be implemented for microalgae-based biofuel derivatives and their production were evaluated. In addition, the fundamental studies on the microalgae technology, experimental cultivation, and engineering processes involved in the development are all measures that are commendably used in the pre-treatment processes. The review article also provides a comprehensive overview of the latest findings about various algae species cultivation and biomass production. It concludes with the most recent data on environmental consequences, their relevance to global efforts to create microalgae-based biomass as effective biofuels, and the most significant threats and future possibilities.

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“…The removal of H and L, can also be done using green methods (GMs) including hydrogen peroxide (H 2 O 2 ) and sodium hydroxide reagents for bleaching process 41 . In comparison with chlorine methods, which release hazardous pollutants, 42 H 2 O 2 decomposes into non‐toxic products such as oxygen and water, 27 reason why it is classified as eco‐friendly 43 . On the other hand, the use of NaOH, is highly efficient to degrade lignin through free radicals 44 enhancing the delignification 45 .…”

Section: Introductionmentioning

confidence: 99%

Valorization of sawdust biomass for biopolymer extraction via green method: Comparison with conventional process

Cárdenas‐Zapata

Palma‐Ramírez

Flores‐Vela

et al. 2022

Intl J of Energy Research

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Summary The valorization of sawdust (SW) biomass by‐product, to extract cellulose through alkali and bleaching processes, including side‐streams to recover hemicellulose and lignin, is performed with the intention of evaluating differences with a proposed green method (GM). The study is developed with the intention of having a process at laboratory scale without leading to the complicated nanoscale processing. This study contemplates a process with scalable characteristics for the future, which contributes to wood processing waste around the world. Particularly, agroindustrial wastes from Durango (SWT1) and Hidalgo (SWT2), local communities of Mexico, were studied. SWT1 and SWT2 samples were processed with ethanol, sodium hydroxide followed by bleaching with sodium chlorite/acetic acid to remove, extractives (E), hemicellulose (H) and lignin (L), respectively. Selected‐SWT2 was processed through a proposed GM using hydrogen peroxide/sodium hydroxide. On the basis of results including Fourier transform infrared spectroscopy, thermogravimetric/differential analysis (TGA/DTG), X‐ray diffraction (XRD), dynamic light scattering, high heating value, scanning electron microscopy techniques and chemical composition, GM was capable of producing a biomass rich in α‐cellulose (58.0%: SWT2‐C), whereas processed SWT1 and SWT2 through conventional method led to a more percentage of H, β‐ and γ‐C mixtures than α‐polymorphous; 41.0% and 51.0%, respectively. This new method could impact of an important manner to the development of biodegradable thermoplastics. The approximation, from deconvolution of TGA/DTA, led to determine adequately the composition of hemicellulose (SWT1‐C: 51.0%, SWT2‐C: 36.0–0.00%), lignin (SWT1‐C: 17.0%, SWT2‐C: 20.0%) and cellulose (SWT1‐C: 32.0%, SWT2‐C: 44.0%). XRD analysis also indicated that samples contain the following percentage of polymorphous cellulose compounds: SWT1‐C (Type II: 71.3%), SWT2‐C (Type I α: 44.6% and II: 41.4%) and SWT2‐C‐GM (Type II: 38.8%), which confirms that the combination of the type of biomass and the applied pretreatment plays a fundamental role for final applications; in this case, it can be appropriate for elastomers and thermoplastic uses. As a final point, the cellulose composition and thermal stability of both sources is comparable with the commonly used raw material for commercial products.

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Enhanced bioremediation of pulp effluents through improved enzymatic treatment strategies: A greener approach

Cited by 28 publications

References 82 publications

Cellulolytic and Ethanologenic Evaluation of Heterotermes indicola’s Gut-Associated Bacterial Isolates

Cellulolytic and Ethanologenic Evaluation of Heterotermes indicola’s Gut-Associated Bacterial Isolates

Bioengineering strategies of microalgae biomass for biofuel production: recent advancement and insight

Valorization of sawdust biomass for biopolymer extraction via green method: Comparison with conventional process

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