Journal ArticleDOI
Self-directing optimization for enhanced caffeine degradation in synthetic coffee wastewater using induced cells of Pseudomonas sp.: Bioreactor studies
TLDR
In this paper, a regression model was developed to predict the caffeine degradation rate with oxygen mass transfer coefficient (kLa) and initial biomass concentration, and the optimal conditions of initial biomass and kLa were 0.23g/L and 64.26h−1 respectively.Abstract:
Coffee wastewater poses a serious threat to the environment due to the presence of a large number of toxic compounds which necessitates the importance of developing suitable treatment methodologies. Although there are treatments available to treat the different wastewaters, the presence of caffeine in wastewater interrupts the complete treatment of coffee wastewater. Alternatively, Pseudomonas sp. showed an excellent capacity to withstand coffee wastewater and degrades caffeine completely in shake flask studies. In this study, we scaled up the coffee wastewater treatment to a 1 L in bioreactor and optimized for caffeine degradation using the self-directing optimization technique. Using self-directing optimization maximum degradation rate of 16.73 mg/L.h was obtained at 210 rpm, 1.16 vvm, and 0.383 g/L of initial biomass. A regression model was developed to predict the caffeine degradation rate with oxygen mass transfer coefficient (kLa) and initial biomass concentration. The regression model was solved and the optimal conditions of initial biomass concentration and kLa are 0.23 g/L and 64.26 h−1 respectively. Under those conditions, experiments were performed and maximum degradation rate was 16.9 mg/L.h was obtained, which is in comparison with model prediction (15.2 mg/L.h).read more
Citations
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Identification of microbial communities and their removal efficiency of multiple pharmaceutical micropollutants combined in Membrane-Bioreactors
TL;DR: In this article , the degradation capacity of a mixture of six micropollutants (caffeine, paracetamol, ibuprofen, diclofenac, enalapril, caffeine, atenolol, and paracetamic acid) at higher concentrations (100 mg/L) was investigated.
Journal ArticleDOI
The effect of temperature on the activity and stability of the thermostable enzyme caffeine dehydrogenase from Pichia manshurica CD1
Journal ArticleDOI
Optimization by uniform design U8(83) approach for enhanced caffeine degradation in synthetic wastewater in bioreactor
TL;DR: This is the first‐ever bioreactor study showing highest caffeine degradation rate in synthetic coffee wastewater with limited experimental runs.
References
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Journal ArticleDOI
Coffee consumption and health: umbrella review of meta-analyses of multiple health outcomes
Robin Poole,Oliver J. Kennedy,Paul Roderick,Jonathan A. Fallowfield,Peter C. Hayes,Julie Parkes +5 more
TL;DR: Coffee consumption seems generally safe within usual levels of intake, with summary estimates indicating largest risk reduction for various health outcomes at three to four cups a day, and more likely to benefit health than harm.
Journal ArticleDOI
Alternative techniques for caffeine removal from wastewater: An overview of opportunities and challenges
Cesar Vinicius Toniciolli Rigueto,Mateus Torres Nazari,Camila Favretto de Souza,Jéssica Stefanello Cadore,Vandré Barbosa Brião,Jeferson Steffanello Piccin +5 more
TL;DR: A literature review of methods for caffeine removal from aqueous solutions and real effluents is presented in this paper, where the main results and limitations of each method are discussed.
Journal ArticleDOI
Novel, Highly Specific N-Demethylases Enable Bacteria To Live on Caffeine and Related Purine Alkaloids
TL;DR: This work reports the first report of bacterial N-demethylase genes that enable bacteria to live on caffeine and represent a new class of Rieske oxygenases and have the potential to produce biofuels, animal feed, and pharmaceuticals from coffee and tea waste.
Journal ArticleDOI
Impacts of discarded coffee waste on human and environmental health
Andréia da Silva Fernandes,F.V.C. Mello,S. Thode Filho,R.M. Carpes,J.G. Honório,Mônica Regina da Costa Marques,Israel Felzenszwalb,Elisa Raquel Anastácio Ferraz +7 more
TL;DR: This work aims to investigate the mutagenic, genotoxic, cytotoxic and ecotoxic effects of leached (LE) and solubilized (SE) extracts from coffee waste, simulating the disposal of this residue in landfills and via sewage systems, respectively.
Journal ArticleDOI
Improvement of tea leaves fermentation with Aspergillus spp. pectinase.
TL;DR: The crude enzyme preparations obtained from ethanol precipitation were found to be more effective in improving tea leaf fermentation than the purified pectinase enzymes.