Search results for: André B. dos Santos

Items from 1 to 16 out of 16 results

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Process bioengineering applied to BTEX degradation in microaerobic treatment systems

João Paulo S. Siqueira, Andrey M. Pereira, Amanda Maria M. Dutra, Paulo Igor M. Firmino, more

Journal of Environmental Management > 2018 > 223 > C > 426-432

The effect of different microaeration flow rates and dosing points, and of effluent recirculation, on microaerobic BTEX degradation in an anaerobic bioreactor was assessed. Additionally, a sensitivity and recovery analysis for this system was performed during microaeration failure simulations. Under anaerobic conditions, BTEX removal efficiencies between 55 and 82% were achieved depending on the compound,...

article

Impact of Microaeration and the Redox Mediator Anthraquinone‐2,6‐Disulfonate on Azo Dye Reduction and By‐Products Degradation

Amanda N. de Barros, Marcos E. R. da Silva, Paulo I. M. Firmino, Eduardo A. F. de Vasconcelos, more

CLEAN – Soil, Air, Water > 46 > 8 > n/a - n/a

This work assessed the impact of microaeration and the redox mediator anthraquinone‐2,6‐disulfonate (AQDS) on both azo dye reduction and by‐products degradation (aromatic amines) in a mesophilic reactor. The experiment was carried out in an up‐flow anaerobic sludge blanket (UASB) reactor with 3.2 L of working volume and hydraulic retention time (HRT) of 24 h. The synthetic effluent contained 50 mg...

article

Understanding the anaerobic BTEX removal in continuous-flow bioreactors for ex situ bioremediation purposes

Paulo Igor M. Firmino, Raquel S. Farias, Amanda N. Barros, Patrícia M.C. Buarque, more

Chemical Engineering Journal > 2015 > 281 > C > 272-280

This work aimed to understand the anaerobic BTEX removal in continuous-flow bioreactors for ex situ bioremediation purposes, evaluating the effect of some operational parameters on efficiency, stability and microbial community structure. The influence of the hydraulic retention time, effluent recirculation and co-substrate (ethanol) concentration was investigated on a mesophilic UASB bioreactor operated...

article

Reliability analysis of low-cost, full-scale domestic wastewater treatment plants for reuse in aquaculture and agriculture

Michael P. Alderson, André B. dos Santos, Cesar R. Mota Filho

Ecological Engineering > 2015 > 82 > C > 6-14

The current paper assesses the reliability coefficients of fifty six low-cost, full-scale wastewater treatment plants, including nine different treatment technologies for wastewater reuse in aquaculture and agriculture in northeast Brazil. This was carried out with the aim to evaluate alternatives for sustainable wastewater reuse in communities experiencing water scarcity. The technologies evaluated...

article

Simultaneous electrochemical sensing of emerging organic contaminants in full-scale sewage treatment plants

Thiago Mielle B.F. Oliveira, Germana de P. Pessoa, André B. dos Santos, Pedro de Lima-Neto, more

Chemical Engineering Journal > 2015 > 267 > Complete > 347-354

Herein, a highly sensitive and selective simultaneous electrochemical method to monitor the emerging organic contaminants tartrazine (TRT), dexamethasone (DMZ) and diclofenac (DCL) in sewage treatment plants was developed. The sensing was based on electroreduction of TRT (−0.22V), DMZ (−0.93V) and DCL (−1.12V) on hanging mercury drop electrode (HMDE), using citrate buffer pH 2.5 as electrolyte. The...

article

Engineering and microbiological aspects of BTEX removal in bioreactors under sulfate-reducing conditions

Paulo Igor M. Firmino, Raquel S. Farias, Patrícia M.C. Buarque, Mayara C. Costa, more

Chemical Engineering Journal > 2015 > 260 > C > 503-512

This work assessed the anaerobic BTEX removal performance of a sulfate-reducing bioreactor at different COD/SO₄²⁻ ratios and co-substrate (ethanol) concentrations. Additionally, the effect of the different operational conditions on the structure (diversity, evenness and richness) of the bacterial and archaeal communities was investigated. The addition of sulfate at different COD/SO₄²⁻ ratios did not...

article

Reactive adsorption of pharmaceuticals on tin oxide pillared montmorillonite: Effect of visible light exposure

Carla B. Vidal, André B. dos Santos, Ronaldo F. do Nascimento, Teresa J. Bandosz

Chemical Engineering Journal > 2015 > 259 > C > 865-875

Montmorillonite (Mt) clay was pillared with SnO₂ and tested as an adsorbent for the removal pharmaceuticals trimethoprim (TMP) and sulfamethoxazole (SMX) frequently present in wastewaters. Adsorption process was carried out in dynamic conditions and the effects of light exposure were investigated. The initial and modified clays were characterized using XRD, FTIR, SEM, potentiometric titration, TA/MS...

article

Occurrence and removal of estrogens in Brazilian wastewater treatment plants

Germana P. Pessoa, Neyliane C. de Souza, Carla B. Vidal, Joana A.C. Alves, more

Science of the Total Environment > 2014 > 490 > Complete > 288-295

This paper evaluated the occurrence and removal efficiency of four estrogenic hormones in five biological wastewater treatment plants (WWTPs), located in the State of Ceará, Brazil. The five WWTPs comprised: two systems consisted of one facultative pond followed by two maturation ponds, one facultative pond, one activated sludge (AS) system followed by a chlorination step, and one upflow anaerobic...

article

Multivariate optimization of headspace‐GC for the determination of monoaromatic compounds (benzene, toluene, ethylbenzene, and xylenes) in waters and wastewaters

Patrícia M. Carneiro, Paulo Igor M. Firmino, Mayara C. Costa, Alexandre C. Lopes, more

Journal of Separation Science > 37 > 3 > 265 - 271

The objective of this study was to optimize, by employing a central composite rotatable design, and validate an analytical method to detect and quantify monoaromatic compounds (benzene, toluene, ethylbenzene, and xylenes) in waters and wastewaters by using headspace extraction followed by GC coupled with photoionization detection. The extraction parameters optimized were: salinity, sample volume,...

article

Reduction of azo dyes by anaerobic bacteria: microbiological and biochemical aspects

Francisco J. Cervantes, André B. Dos Santos

Reviews in Environmental Science and Bio/Technology > 2011 > 10 > 2 > 125-137

Azo dyes are recalcitrant pollutants commonly found in several industrial wastewaters, such as those originated from textile factories, which generally persist to biological transformation. Discharge of these effluents in open water bodies not only represents an aesthetic problem, but also may limit photosynthesis in aquatic plants. Furthermore, many azo dyes and products derived from their partial...

article

Colour removal of dyes from synthetic and real textile wastewaters in one- and two-stage anaerobic systems

Paulo Igor M. Firmino, Marcos Erick R. da Silva, Francisco J. Cervantes, André B. dos Santos

Bioresource Technology > 2010 > 101 > 20 > 7773-7779

Decolourisation of the azo dye model compound, Congo Red (CR), and real textile wastewater, was assessed in one- and two-stage anaerobic treatment systems (R ₁ and R ₂ , respectively). High colour removals were achieved in both treatment systems even when a very high CR concentration (1.2mM) was applied. However, R ₂ presented a slightly better stability, in which the acidogenic...

article

Review paper on current technologies for decolourisation of textile wastewaters: Perspectives for anaerobic biotechnology

André B. dos Santos, Francisco J. Cervantes, Jules B. van Lier

Bioresource Technology > 2007 > 98 > 12 > 2369-2385

Dyes are natural and xenobiotic compounds that make the world more beautiful through coloured substances. However, the release of coloured wastewaters represents a serious environmental problem and a public health concern. Colour removal, especially from textile wastewaters, has been a big challenge over the last decades, and up to now there is no single and economically attractive treatment that...

article

The contribution of fermentative bacteria and methanogenic archaea to azo dye reduction by a thermophilic anaerobic consortium

André B. dos Santos, Marta P. de Madrid, Frank A.M. de Bok, Alfons J.M. Stams, more

Enzyme and Microbial Technology > 2006 > 39 > 1 > 38-46

The contribution of fermentative bacteria and methanogenic archaea to azo dye reduction by a thermophilic anaerobic consortium was studied. Additionally, the effects of different electron-donating substrates and the redox mediator riboflavin on dye reduction were assessed by using either a methanogenic consortium or pure cultures of methanogens. Our results indicate that fermentative bacteria and...

article

The transformation and toxicity of anthraquinone dyes during thermophilic (55°C) and mesophilic (30°C) anaerobic treatments

André B. dos Santos, Iemke A.E. Bisschops, Francisco J. Cervantes, Jules B. van Lier

Journal of Biotechnology > 2005 > 115 > 4 > 345-353

We studied in batch assays the transformation and toxicity of anthraquinone dyes during incubations with anaerobic granular sludge under mesophilic (30°C) and thermophilic (55°C) conditions. Additionally, the electron shuttling capacity of the redox mediator anthraquinone-2-sulfonic acid (AQS) and subsequent increase on decolourisation rates was investigated on anthraquinone dyes. Compared with incubations...

article

Azo Dye Reduction by Mesophilic and Thermophilic Anaerobic Consortia

André B. dos Santos, Marta P. de Madrid, Alfons J. M. Stams, Jules B. Van Lier, more

Biotechnology Progress > 2005 > 21 > 4 > 1140 - 1145

article

Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30 ^o C) and thermophilic (55 ^o C) treatments for decolourisation of textile wastewaters

André B. dos Santos, Iemke A.E. Bisschops, Francisco J. Cervantes, Jules B. van Lier

Chemosphere > 2004 > 55 > 9 > 1149-1157

The impact of different redox mediators on colour removal of azo dye model compounds and textile wastewater by thermophilic anaerobic granular sludge (55 ^o C) was investigated in batch assays. Additionally, a comparative study between mesophilic (30 ^o C) and thermophilic (55 ^o C) colour removal was performed with textile wastewater, either in the presence or absence of a redox...

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Search results for: André B. dos Santos

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