Peroxidases from grass clippings for the removal of phenolic compounds from wastewater

Langsdorf, Alexander; Volkmar, Marianne; Ulber, Roland; Hollmann, Frank; Holtmann, Dirk

doi:10.1016/j.biteb.2023.101471

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…By combining water electrolysis with the ability to convert CO 2 , C. necator can also be used in bioelectrochemical synthesis, combining CO 2 conversion with the sustainable generation of electrical energy to produce valuable chemicals [4][5][6]. The ability to convert a wide range of waste streams into these high-value products provides a great opportunity to develop a waste-based circular bioeconomy based on C. necator [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Autotrophic Production of the Sesquiterpene α-Humulene with Cupriavidus necator in a Controlled Bioreactor

Sydow,

Becker,

Lombard

et al. 2023

Bioengineering

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Cupriavidus necator is a facultative chemolithotrophic organism that grows under both heterotrophic and autotrophic conditions. It is becoming increasingly important due to its ability to convert CO2 into industrially valuable chemicals. To translate the potential of C. necator into technical applications, it is necessary to optimize and scale up production processes. A previous proof-of-principle study showed that C. necator can be used for the de novo production of the terpene α-humulene from CO2 up to concentrations of 11 mg L−1 in septum flasks. However, an increase in final product titer and space–time yield will be necessary to establish an economically viable industrial process. To ensure optimized growth and production conditions, the application of an improved process design in a gas bioreactor with the control of pH, dissolved oxygen and temperature including a controlled gas supply was investigated. In the controlled gas bioreactor, the concentration of α-humulene was improved by a factor of 6.6 and the space–time yield was improved by a factor of 13.2. These results represent an important step toward the autotrophic production of high-value chemicals from CO2. In addition, the in situ product removal of α-humulene was investigated and important indications of the critical logP value were obtained, which was in the range of 3.0–4.2.

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Section: Introductionmentioning

confidence: 99%

Autotrophic Production of the Sesquiterpene α-Humulene with Cupriavidus necator in a Controlled Bioreactor

Sydow,

Becker,

Lombard

et al. 2023

Bioengineering

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Towards oxidoreductase-based processes for the removal of antibiotics from wastewater

de Boer,

Schäffer,

Moreira

2023

Rev Environ Sci Biotechnol

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The occurrence of antibiotics in surface waters is an alarming issue that can be addressed by advanced wastewater treatment technologies. Among them, enzymatic treatment is an emerging technology claimed to provide prospective benefits in terms of efficiency, controllability, and safety. This review illustrates the current state of research focused on enzyme-based approaches for pollutant abatement, specifically on the most critical classes of antibiotics (e.g. tetracyclines, sulfonamides, fluoroquinolones). In addition to providing an overview of the efficiency both in terms of compound removal as well as toxicity reduction, we critically analyze if selected reaction conditions, such as the pH, temperature and water matrix are representative for real-case scenarios. Enzyme immobilization strategies onto inorganic, organic and composite materials are analyzed in terms of their effect on enzyme stability and activity. Their feasibility to be applied in future processes was also evaluated. We found that adequate kinetic description of target compound removal by sufficiently detailed models is still scarce even though it will be key for successful conceptualization of treatment processes. Considering that only a few studies have been conducted at scales above 100 mL, we present the investigated reactor configurations which are at the forefront of further scale-up. The systematic approach presented in this manuscript, which aims to critically evaluate the feasibility to implement enzymatic processes for the removal of antibiotics, can be adapted for other types of recalcitrant compounds targeted by oxidoreductases. Intensified research in the recommended areas will contribute to the development of enzyme-based processes which can complement other advanced wastewater treatment processes. Graphical abstract

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Value adding bioconversion of residues and byproducts—a logistics challenge

Rudi,

Schönrock,

Laudensack

et al. 2024

Discov Appl Sci

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Global developments such as climate change, a growing world population and the depletion of fossil resources make the sustainable use of biogenic resources in chemical production inevitable. This would also provide a final product with a higher added value than just utilizing the raw materials for applications in energy generation. In recent years, many researchers have shown that e.g., grass clippings, carrots and potato peels can be biotechnologically converted into high-value chemicals thereby increasing resource efficiency. A particular challenge, however, is the decentralized production of such biogenic raw materials as well as degradation affecting the composition and quality within short periods of time. Therefore, appropriate logistics concepts must be developed and evaluated to economically valorize biogenic raw materials. Such concepts differ significantly in terms of material utilization for the production of chemicals, composting or energetic valorization. This overview presents relevant examples of the conversion of biogenic residues into chemicals investigating basic logistic concepts and highlighting major challenges along bio-based value chains.

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Peroxidases from grass clippings for the removal of phenolic compounds from wastewater

Cited by 5 publications

References 47 publications

Autotrophic Production of the Sesquiterpene α-Humulene with Cupriavidus necator in a Controlled Bioreactor

Autotrophic Production of the Sesquiterpene α-Humulene with Cupriavidus necator in a Controlled Bioreactor

Towards oxidoreductase-based processes for the removal of antibiotics from wastewater

Value adding bioconversion of residues and byproducts—a logistics challenge

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