Wilton Silva Lopes

@uepb.edu.br

Departamento de Engenharia Sanitária e Ambiental
Universidade Estadual da Paraíba



              

https://researchid.co/wiltonuepb

RESEARCH, TEACHING, or OTHER INTERESTS

Environmental Engineering, Chemistry

58

Scopus Publications

Scopus Publications

  • Enhanced Nitrification in UASB Reactor Effluent Using Non-Woven Fabric Filters: A Low-Cost Post-Treatment Solution
    Marília Patrício Alves, Tales Abreu Tavares de Sousa, Wanderson Barbosa da Silva Feitosa, Valderi Duarte Leite, Wilton Silva Lopes, and José Tavares de Sousa
    Mary Ann Liebert Inc

  • Allelopathic effects of cyanotoxins on the physiological responses of Chlorella vulgaris
    Maria Virgínia da Conceição Albuquerque, Railson de Oliveira Ramos, Maria Célia Cavalcante de Paula e Silva, Roberta Milena Moura Rodrigues, Valderi Duarte Leite, and Wilton Silva Lopes
    Elsevier BV

  • Kinetic Modeling of Anaerobic Co-Digestion Of Plant Solid Waste with Sewage Sludge: Synergistic Influences of Total Solids and Substrate Particle Size in Biogas Generation
    Valderi D. Leite, Railson O. Ramos, Wilton S. Lopes, Mário César Ugulino de Araújo, Valber Elias de Almeida, Nadja Maria da Silva Oliveira, and Crislanne Lemos Viriato
    Springer Science and Business Media LLC

  • Toxicity assessment of sanitary landfill leachate before and after Fenton treatment process
    Tales Abreu Tavares de Sousa, Edilma Rodrigues Bento Dantas, Wilza da Silva Lopes, Valderi Duarte Leite, José Tavares de Sousa, and Wilton Silva Lopes
    Elsevier BV

  • Treatment of wastewater for reuse using advanced oxidation process: a bacterial inactivation mechanism approach
    R. O. Ramos, W. S. Lopes, Y. H. D. M. Luna, M. V. da C. Albuquerque, V. D. Leite, J. T. de Sousa, M. C. U. Araújo, and W. S. Lopes
    Springer Science and Business Media LLC

  • Kinetic modeling and interrelationship aspects of biogas production from waste activated sludge solubilized by enzymatic and thermal pre-treatment
    Ailton João Gonçalves Moreira, Tales Abreu Tavares de Sousa, Davide Franco, Wilton Silva Lopes, and Armando Borges de Castilhos Junior
    Elsevier BV

  • Kinetic models describing the hydrolytic stage of the anaerobic co-digestion of solid vegetable waste and anaerobic sewage sludge
    Valderi D. Leite, Railson O. Ramos, Paula M. U. Silva, Wilton S. Lopes, and José T. Sousa
    Springer Science and Business Media LLC


  • Pathways, by-products, reaction intermediates, and kinetics study of degradation of profenofos via photo-assisted peroxidation
    Railson O. Ramos, Maria V.C. Albuquerque, Suelly F. da Silva, Wellington S. Lyra, Mário César U. Araújo, José T. de Sousa, Valderi D. Leite, and Wilton S. Lopes
    Elsevier BV

  • Assessment of bioconversion performance after alkaline fermentation process to recover biogas and nutrients
    Timóteo Silva Ferreira, Tales Abreu Tavares de Sousa, Hidelbrando José Farkat Diógenes, Israel Nunes Henrique, Valderi Duarte Leite, Wilton Silva Lopes, and José Tavares de Sousa
    Desalination Publications
    Alkaline fermentation of two distinct types of waste activated sludge was assessed to evaluate the recovery of by-products, such as nutrients, organic matter as a source of bioenergy, volatile fatty acids, and water. Also, to reduce the amount of solids to be disposed of, and the total management costs. Sludge 1 was from conventional activated sludge, and Sludge 2 was from a sequential batch reactor set for biological phosphorus removal. In the laboratory three different fermentation processes were provided in parallel, treating Sludge 1, followed by Sludge 2. Treatment A was the control, wherein the fermentation process occurred without alkali addition. Treatment B was alkaline fermen- tation with a controlled pH 10 of pre-solubilized sludge, and treatment C was alkaline fermentation at a controlled pH 10. The results indicated that alkaline fermentation significantly reduced the vol- atile suspended solids (VSS) to 45% treating Sludge 1, and to 50% treating Sludge 2, which was significantly improved for both sludges when pre-solubilized achieving 59% and 60%, respec- tively. Also, comparing the biogas production test of treatment A to the other conditions set, both increased almost four, and three times, for B and C, respectively. Orthophosphate, chem- ical oxygen demand, carbohydrates, and proteins in soluble fractions significantly increased under alkaline fermentation compared with the control, and all of these parameters were boosted with pre-solubilization. Comparing both sludges, the one from biological phosphorus removal systems achieved higher VSS reduction, and a significantly higher rate of orthophosphate release.

  • A video processing and machine vision-based automatic analyzer to determine sequentially total suspended and settleable solids in wastewater
    Railson de Oliveira Ramos, David Douglas de Sousa Fernandes, Valber Elias de Almeida, Paulo Henrique Gonçalves Dias Diniz, Wilton Silva Lopes, Valderi Duarte Leite, and Mário César Ugulino de Araújo
    Elsevier BV

  • Studies of the liposolubility and the ecotoxicity of MC-LR degradation by-products using computational molecular modeling and in-vivo tests with Chlorella vulgaris and Daphnia magna
    Maria Virgínia da Conceição Albuquerque, Railson de Oliveira Ramos, Valderi Duarte Leite, José Tavares de Sousa, Mário César Ugulino de Araújo, Beatriz Susana Ovruski de Ceballos, and Wilton Silva Lopes
    Elsevier BV

  • Removal of microcystin-LR from eutrophic water using solar distillation
    Maria Virgínia da Conceição Albuquerque, Eyre Katrinne Ferreira de Carvalho, Carlos Antônio Pereira de Lima, José Tavares de Sousa, Valderi Duarte Leite, and Wilton Silva Lopes
    Elsevier BV
    The aim of this study was to evaluate the removal of microcystin-LR (MC-LR) from eutrophic water produced in the laboratory, using a pyramid-shaped solar still to obtain drinking water that meets all potability standards recommended in ordinance 2914/11 of the Brazilian Ministry of Health. The methods used for the analysis of physicochemical parameters were according to APHA, 2012. The detection and quantification of MC-LR was performed using coupled high-performance liquid chromatography and mass spectrometry. The results showed turbidity removal of over 95%, and reduction of true color from 19 to 5 uH after the distillation process. As expected, there was also a decrease in pH and hardness in relation to the study water. Ammonia showed a relative increase in concentration but still remained within the maximum allowed by law. The results showed a mean concentration of 11.4 µg L –1 of MC-LR in the studied water, while no cyanotoxin was detected in the distilled water. To further verify the removal of MC-LR, the samples were then injected in a mass spectrometer, and the results demonstrated that there was a concentration of MC-LR in the remaining water in the tray of the still, so that the final treated water was free of cyanotoxin.

  • Anaerobic dynamic membrane bioreactor applied to wastewater treatment: a review
    Jacob Fortuna José Chimuca, Catarina Simone Andrade do Canto, José Tavares de Sousa, Valderi Duarte Leite, and Wilton Silva Lopes
    Institut Quimic de Sarria
    Membrane bioreactors have been widely used in biological wastewater treatment. The membranes used in this type of technology are produced from organic or inorganic materials. However, membranes can also be formed from the deposition of solid particles, colloids, and polymeric materials, as well as microbial cells and flocs, on an inert support during the filtration process. When coupled to a bioreactor, they establish a unique system called a dynamic membrane bioreactor (DMBR). This type of bioreactor, while retaining the solids and microorganisms present in the system, removes both easy and difficult-to-degrade organic material, which reduces treatment costs and makes it advantageous compared to conventional membrane bioreactors (MBRs). In Brazil, this technology is relatively new and still little explored. Therefore, the present study aims to evaluate the DMBR's performance in anaerobic wastewater treatment systems. In addition to the advantages and disadvantages presented by this type of system compared to conventional MBRs (micro and ultrafiltration), the fouling phenomenon, its implications, and the theories that explain the formation of the dynamic layer are described. Finally, some challenges that still need to be overcome in the use of this technology are pointed out in order to be affirmed as a safe and robust tool for the biological treatment of domestic and industrial wastewater.

  • Chemical safety assessment of transformation products of landfill leachate formed during the Fenton process
    Luana de Morais e Silva, Vinicius M. Alves, Edilma R.B. Dantas, Luciana Scotti, Wilton Silva Lopes, Eugene N. Muratov, and Marcus Tullius Scotti
    Elsevier BV

  • Fouling mechanism in dynamic membrane anaerobic bioreactor treating domestic sewage: Filtration performance
    Jacob Fortuna José Chimuca, José Tavares de Sousa, Wilton Silva Lopes, Catarina Simone Andrade do Canto, and Valderi Duarte Leite
    Elsevier BV
    In order to investigate the fouling mechanism in dynamic membrane (DM) formation, and filtration performance in domestic sewage treatment at an ambient temperature ranging from 24°C to 36°C, an anaerobic dynamic membrane bioreactor (AnDMBR) was monitored. Hydraulic retention times applied were 8 and 12 h, under permeate fluxes of 1,755 and 1,170 L m–2 h–2 in phases I and II, respectively. In both phases, after a 10% reduction in permeate flux, backwashing was performed. This allowed a prolonged filtration of 84 d for phase I and 76 d for phase II. The total resistance to filtration was in the magnitude of 1011 m–1, implying excellent filterability by the DM, and energy-saving potential for the AnDMBR system. The system had good treatment performance, achieving average volatile fatty acid reduction of 53%, total chemical oxygen demand (COD) removal efficiencies of 84%, soluble COD of 72%, and color of 80%; being able to remove 94% of suspended solids, and producing an effluent with low turbidity (17 NTU). The biogas measured in the system was 154 N mL g–1 COD removed, which represents 35% of its theoretical value, which means that most of it left in dissolved form with the effluent due to supersaturation. The predominant fouling mechanism in DM formation in all permeates fluxes tested was cake filtration, with the main cause being the concentration of inoculum sludge. This confirms the prominence of DM formation during filtration and high solid–liquid separation.

  • Alkaline and acid solubilisation of waste activated sludge
    Tales Abreu Tavares de Sousa, Fernanda Patrício do Monte, José Vanderley do Nascimento Silva, Wilton Silva Lopes, Valderi Duarte Leite, Jules B. van Lier, and José Tavares de Sousa
    IWA Publishing
    Abstract The influence of acidic and alkaline conditions on the solubilisation process of waste activated sludge (WAS) was investigated using HCl and NaOH at pH 2, 10, 11 and 12. The rise in concentration of solubilised compounds, the influence of reaction time, and the influence of the concentration of total solids (TS) during the solubilisation process were determined. Physical and chemical tests demonstrated that pre-treatment provided a release of compounds from the sludge floc matrix into the soluble fraction, characterising the solubilisation process. The highest degree of WAS solubilisation was observed when a pH of 12 was applied. Although largest effects were already attained after 0.25 h, WAS solubilisation continued reaching an increase in total dissolved solids by a factor 10.4 after 720 hrs. Under these conditions, the dissolved organic carbon (DOC), proteins, and carbohydrates resulted in releases up to 15, 40 and 41 times, respectively; phosphorus increased 5.7 times. Results indicate that by applying alkaline pre-treatment, higher TS concentrations can be treated per reactor volume compared to non-pre-treated WAS. Aerobic and anaerobic biodegradability tests showed increased bioconversion potentials in full-scale treatment plants. The respirometry tests ratify the improvement in solubilisation, with O2 consumption rates increasing 1.4 times, concomitant with an additional 261 mg·L−1 of the COD used, which represents 90% bioconversion of waste activated sludge. Biomethanisation test indicated an increase of 3.6 times relative to the blank.

  • Phytochemistry, antifungal and antioxidant activity, and cytotoxicity of byrsonima gardneriana (A. Juss) extract
    Waleska Ohana de Souza-Melo, Ernani Canuto Figueiredo-Júnior, Julliana Cariry Palhano Freire, Bruna Palmeira Costa, Andressa Brito Lira, Irlan Almeida Freires, Yuri Wanderley Cavalcanti, Wilton Silva Lopes, Josean Fechine Tavares, Hilzeth de Luna Freire Pessôa,et al.
    Elsevier BV

  • The Use and Evolution of Web Tools for Aquatic Toxicology Studies
    Renata P. B. Menezes, Natália F. Sousa, Luana de Morais e Silva, Luciana Scotti, Wilton Silva Lopes, and Marcus T. Scotti
    Wiley

  • Phytochemical composition, antifungal activity, in vitro and in vivo toxicity of syzygium cumini (L.) skeels leaves extract
    Ernani Canuto Figueiredo Junior, , Yuri Wanderley Cavalcanti, Andressa Brito Lira, Hilzeth de Luna Freire Pessoa, Wilton Silva Lopes, Diego Romario da Silva, Irlan Almeida Freires, Pedro Luiz Rosalen, Edja Maria Melo de Brito Costa,et al.
    MS-Editions
    This study determined phytochemical composition, antifungal activity and toxicity in vitro and in vivo of Syzygium cumini leaves extract (Sc). Thus, was characterized by gas chromatography coupled to mass spectrometry and submitted to determination of Minimum Inhibitory (MIC) and Fungicidal concentrations (MFC) on reference and clinical strains of Candida spp. and by growth kinetics assays. Toxicity was verified using in vitro assays of hemolysis, osmotic fragility, oxidant and antioxidant activity in human erythrocytes and by in vivo acute systemic toxicity in Galleria mellonella larvae. Fourteen different compounds were identified in Sc, which showed antifungal activity (MIC between 31.25-125 μg/mL) with fungistatic effect on Candida. At antifungal concentrations, it demonstrated low cytotoxicity, antioxidant activity and neglible in vivo toxicity. Thus, Sc demonstrated a promising antifungal potential, with low toxicity, indicating that this extract can be a safe and effective alternative antifungal agent.

  • Performance of Anaerobic Hybrid Reactor with Post-Treatment in Intermittent Flow Sand Filter: a Sulfide-Oxidizing Bioprocess for the Treatment of Sanitary Sewage Using Nitrate as Electron Acceptor
    Luciana L. B. Cabral, José T. Sousa, Wilton S. Lopes, Valderi D. Leite, and Rodrigo A. Barbosa
    Springer Science and Business Media LLC

  • Degradation of indigo carmine by photo-Fenton, Fenton, H<inf>2</inf>O<inf>2</inf>/UV-C and direct UV-C: Comparison of pathways, products and kinetics
    Railson O. Ramos, Maria V.C. Albuquerque, Wilton S. Lopes, José T. Sousa, and Valderi D. Leite
    Elsevier BV

  • Fenton treatment of sanitary landfill leachate: optimization of operational parameters, characterization of sludge and toxicology
    Edilma R. B. Dantas, Edlamara J. Silva, Wilton S. Lopes, Marcelo R. do Nascimento, Valderi D. Leite, and José T. de Sousa
    Informa UK Limited
    ABSTRACT This investigation aimed to refine the operational parameters of the Fenton process, to compare Fenton-treated and non-treated leachate with respect to physicochemical variables and toxicity towards Daphnia magna, and to characterize the sludge. The optimal conditions for the Fenton treatment involved the use of a reagent containing 12 g Fe2+ L−1, H2O2/Fe2+ molar ratio of 9 and pH 2.0, with oxidation, flocculation and sedimentation times of 30, 10 and 15 min, respectively. Under these conditions, the values of the majority of parameters, including chemical oxygen demand (COD), biochemical oxygen demand, dissolved organic carbon, true color (TC), carbohydrates, proteins, phosphorus, total solids, total volatile solids, dissolved volatile solids, Kjeldahl nitrogen, N-NH3 and iron, were reduced significantly after treatment. However, sludge production rate remained somewhat high (98 kg m−3 of treated leachate), although the specific resistance to filtration of the sludge was moderate (12 × 109 cm g−1). While the Fenton process achieved a satisfactory removal of COD (87%) and TC (91%), the treated leachate contained organic compounds that were resistant to oxidation and remained toxic towards D. magna. Hence we conclude that the Fenton process alone is not appropriate for treatment of leachate, because it could negatively affect the ecosystem in receiving water bodies, but it could represent a viable alternative for the pretreatment of landfill leachate. GRAPHICAL ABSTRACT

  • Decentralized treatment of domestic sewage in dynamic membrane bioreactor
    Jacob Fortuna José Chimuca, José Tavares de Sousa, Wilton Silva Lopes, Valderi Duarte Leite, and Catarina Simone Andrade do Canto
    Elsevier BV
    A pilot-scale anaerobic dynamic membrane bioreactor (AnDMBR) was monitored at ambient temperature to assess domestic sewage treatment from a housing development. The dynamic membrane (DM) was developed from polypropylene support material with an average opening of 90 μm, inside an external configuration module. To minimize energy costs, the AnDMBR system was operated under hydraulic pressure, in two Cycles, without backwashing (Cycle 1), and with backwashing (Cycle 2). The HRT was 18 h and the initial permeate flow was 780 L m–2 h–1. The CRT of Cycle 1 was 91 d, and Cycle 2 was 49 d. The average concentrations of MLTSS in Cycle 1 and 2 were 29.40 and 29.60 g L–1, respectively. The system achieved good average efficiency of removing organic matter, with a total COD value of 86.0% and soluble COD of 76.0%, being able to remove 91.0% of suspended solids, producing an effluent with low turbidity (18.0 NTU). The results also show that the DM contributed to the production of effluent with a concentration of helminth eggs which meets WHO recommendations [47] for unrestricted irrigation. A significant amount of biogas was produced by the system and most came out in dissolved form with the effluent due to supersaturation. The average transmembrane pressure (TMP) of Cycle 2 was 2.0 times greater than that of Cycle 1, which suggests that fouling cannot be effectively removed with tap-water washing or with backwashing.

  • Sediment and tissue analysis for metals in a tropical estuary
    Eliane de Andrade Araújo Pereira, William de Paiva, Joseline Molozzi, and Wilton Silva Lopes
    Elsevier BV