A systematic optimization of piggery wastewater treatment with purple phototrophic bacteria

Sepúlveda-Muñoz, Cristian A.; Godos, Ignacio de; Puyol, Daniel; Muñoz, Raúl

doi:10.1016/j.chemosphere.2020.126621

Cited by 24 publications

(16 citation statements)

References 42 publications

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“…Já as microalgas, cultivadas em fotobiorreatores, podem ser integradas ao sistema de digestão anaeróbica como estratégia para purificar o biogás, pois o processo de fotossíntese é capaz de fixar o CO 2 e liberar oxigênio. Por fim, a biomassa das microalgas pode ser usada em outras finalidades, como produção de bio-óleo ou no processo de coodigestão anaeróbica (Sepúlveda-Muñoz et al 2020, Uggetti et al 2018.…”

Section: Biossíntese E Fotobiorreatorunclassified

Tecnologias para a economia circular na agropecuária

Muhl¹,

Oliveira²

2022

Iheringia Ser Bot

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Section: Biossíntese E Fotobiorreatorunclassified

Tecnologias para a economia circular na agropecuária

Muhl¹,

Oliveira²

2022

Iheringia Ser Bot

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“…Despite several works concluding that PPB behaves differently depending on the organic substrate [7,24], this work sustains that these metabolic-based differences do not pose a large difference in the overall performance of the mixed culture. In a recent paper, it has been concluded that controlling the general control parameters in wastewater treatment (like pH, oxygen, and alkalinity) is an efficient way to improve the performance of PPB-based wastewater treatment [25].…”

Section: Effect Of Organic Susbtrates On Microbial Community Developmentmentioning

confidence: 99%

Alkalinity, and Not the Oxidation State of the Organic Substrate, Is the Key Factor in Domestic Wastewater Treatment by Mixed Cultures of Purple Phototrophic Bacteria

et al. 2020

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Domestic wastewater treatment by purple phototrophic bacteria (PPB) is based on the assimilative uptake of organics and nutrients into the bacterial biomass. Thereby, it strongly depends on the carbon/nutrients ratio of the wastewater. The physiological COD/N/P ratio for PPB growth in domestic wastewater makes the addition of an external organic carbon source necessary in order to allow for an efficient process. However, PPB need a source of alkalinity (as CO2) to grow on reduced organics that serves as an electron acceptor since biohydrogen production (an alternative electron sink) is inhibited by ammonium. A preliminary experiment showed that high nutrients-loading wastewater was limited by CO2 imbalance, leading to poor removal efficiencies. Subsequently, the effect of the oxidation state of the organics added as external organic carbon sources to PPB reactors treating low nutrients-loading domestic wastewater has been analyzed. Three organics were used as additives to PPB development in four consecutive batches: acetate (more oxidized), ethanol and butyrate (more reduced). The PPB population was settled and the general performance under the three situations, in terms of organics, N and P assimilation, and growth kinetics was not significantly different irrespective of the external organic carbon source. The reactors were dominated by PPB, though reduced organics allowed for dominance of Rhodopseudomonas palustris, whereas oxidized organics caused co-dominance of R. palustris and Rhodobacter capsulatus. Thereby, alkalinity (as bicarbonate), and not the oxidation state of the organics, is the key parameter for the efficient treatment of domestic wastewater by PPB.

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“…As a result, the treatment of organics in water has garnered increased attention. At present, the main treatment methods for organics in wastewater include physical [ 5 , 6 ], chemical and biological methods [ 7 , 8 , 9 , 10 , 11 , 12 ], or a combination thereof [ 13 , 14 , 15 ]. Among others, advanced oxidation methods showed potential advantages in treating organics, including the generation of reactive free radicals with strong oxidizing abilities, an effective degradation of organics and a better mineralizing effect [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

N-Doped Biochar as a New Metal-Free Activator of Peroxymonosulfate for Singlet Oxygen-Dominated Catalytic Degradation of Acid Orange 7

et al. 2021

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In this paper, using rice straw as a raw material and urea as a nitrogen precursor, a composite catalyst (a nitrogen-doped rice straw biochar at the pyrolysis temperature of 800 °C, recorded as NRSBC800) was synthesized by one-step pyrolysis. NRSBC800 was then characterized using XPS, BET, TEM and other technologies, and its catalytic performance as an activator for permonosulfate (PMS) to degrade acid orange 7 (AO7) was studied. The results show that the introduction of N-doping significantly improved the catalytic performance of NRSBC800. The NRSBC800/PMS oxidation system could fully degrade AO7 within 30 min, with the reaction rate constant (2.1 × 10 −1 min−1) being 38 times that of RSBC800 (5.5 × 10−3 min−1). Moreover, NRSBC800 not only had better catalytic performance than traditional metal oxides (Co3O4 and Fe3O4) and carbon nanomaterial (CNT) but also received less impact from environmental water factors (such as anions and humic acids) during the catalytic degradation process. In addition, a quenching test and electron paramagnetic resonance (EPR) research both indicated that AO7 degradation relied mainly on non-free radical oxidation (primarily singlet oxygen (1O2)). A recycling experiment further demonstrated NRSBC800’s high stability after recycling three times.

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A systematic optimization of piggery wastewater treatment with purple phototrophic bacteria

Cited by 24 publications

References 42 publications

Tecnologias para a economia circular na agropecuária

Tecnologias para a economia circular na agropecuária

Alkalinity, and Not the Oxidation State of the Organic Substrate, Is the Key Factor in Domestic Wastewater Treatment by Mixed Cultures of Purple Phototrophic Bacteria

N-Doped Biochar as a New Metal-Free Activator of Peroxymonosulfate for Singlet Oxygen-Dominated Catalytic Degradation of Acid Orange 7

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