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Eletrocoagulação bipolar e monopolar na ovariosalpingohisterectomia videocirurgica híbrida utilizando dois portais em felinos hígidos; Monopolar and bipolar electrocoagulation in ovarysalpingohysterectomy laparoscopy with two portals in healthy cats

Aguiar, Juliana
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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Neste trabalho foi realizado um estudo comparativo entre duas técnicas de oclusão do Complexo Artério Venoso Ovariano (CAVO), por meio da eletrocoagulação monopolar e bipolar, na ovariosalpingohisterectomia (OSH) de felinos hígidos, realizada a partir da técnica com dois portais na linha média ventral. A OSH é um dos procedimentos laparoscópicos mais realizados na casuística da Medicina Veterinária. Diferentes técnicas tem sido realizadas para a execução deste procedimento, dentre as variações incluem-se o número e a disposição dos trocartes, sendo recente a execução da técnica com dois portais. Os objetivos da pesquisa foram descrever a técnica da OSH em felinos com dois portais, bem como comparar a eficácia da eletrocoagulação monopolar e bipolar na obliteração do CAVO. Foram utilizadas 16 gatas adultas, distribuídas aleatoriamente em dois grupos de oito animais. Os procedimentos videocirúrgicos foram realizados por meio da inserção dos portais na linha média ventral nas regiões umbilical e pré-púbica, com os felinos posicionados em decúbito dorsal. Além da verificação da viabilidade da técnica com o uso de apenas dois portais lineares, foram avaliados e comparados o tempo cirúrgico, a eficácia dos dois métodos de eletrocoagulação...

Treatment of Acral Persistent Papular Mucinosis with Electrocoagulation

Jorge, Flavia Andre; Cortez, Tatiana Mimura; Mendes, Fabiana Guadalini; Alencar Marques, Mariangela Esther; Miot, Hélio Amante
Fonte: B C Decker Inc Publicador: B C Decker Inc
Tipo: Outros Formato: 227-229
ENG
Relevância na Pesquisa
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Background: Acral persistent papular mucinosis is a rare localized form of lichen myxedematosus with few case reports and no documented therapeutic options.Objective: To report full resolution of acral persistent papular mucinosis after electrocoagulation.Methods: Case report of a 51-year-old white female diagnosed with an acral persistent papular mucinosis. The clinical and histopathologic features, treatment provided, and response to treatment are detailed.Results: Acral persistent papular mucinosis presented as multiple asymptomatic normochromic papules on the wrists. Treatment with topical and intralesional steroids was unsatisfactory. Gentle electrocoagulation led to complete resolution of the lesions and negligible scarring. The favorable results remained for 6 months of follow-up, and no new lesions have emerged.Conclusion: Our case of acral persistent papular mucinosis was successfully treated with electrocoagulation and long-lasting, excellent cosmetic results.

Electrocoagulation/flotation followed by fluidized bed anaerobic reactor applied to tannery effluent treatment

Sbizzaro Filho, Daniel; Bota, Guilherme Bonfatti; Borri, Rodrigo Babora; Cuba Teran, Francisco Javier
Fonte: Desalination Publ Publicador: Desalination Publ
Tipo: Artigo de Revista Científica Formato: 359-363
ENG
Relevância na Pesquisa
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); A series operation of electrocoagulation/flotation (ECF) and fluidized bed anaerobic reactor (FBR) was conducted to treat tannery wastewater. Although both reactors were operated in fill-and-draw (batch) mode, effluent from ECF was fed to FBR in order to remove the remaining soluble biodegradable organic matter. Operating with a hydraulic residence time of 65 min, the ECF reactor reached 59% COD removal and FBR reached 74% COD removal with an 8 h residence time. Time profiles for wastewater treatment of 65 min in ECF plus 12 h in FBR, showed 39% removal of COD in the first 10 min and 84% in the remaining 775 min of the overall operation cycle. Although turbidity in the raw influent reached levels beyond the upper limit of detection for the turbidimeter, values as low as 10 uT were detected after 65 min treatment in ECF. However, after being treated for 8 h in FBR, the efficiency of turbidity removal was affected by solids settling in the recirculation basin.

A eletrocoagulação na terapêutica das lesões intra-epiteliais escamosas de alto grau do colo uterino

Lian, Ie Tjie
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 116 f.
POR
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Pós-graduação em Ginecologia, Obstetrícia e Mastologia - FMB; Analisar a eficácia da eletrocoagulação, como terapêutica nas pacientes portadoras de lesão intra-epitelial escamosa de alto grau de colo uterino. Pacientes e métodos: Estudaram-se prospectivamente 116 pacientes portadoras de lesão intra-epitelial escamosa de alto grau do colo de útero, distribuídas aleatoriamente, com 49 pacientes no grupo de estudo e 67 pacientes no grupo controle. Ambos os grupos foram avaliados quanto à idade, coitarca, paridade, hábito de tabagismo, número de parceiros sexuais, uso de drogas, presença ou antecedente de lesão condilomatosa vulvar, raça e escolaridade. Essas variáveis apresentaram-se homogêneas em ambos os grupos. Todas as pacientes do grupo de estudo e do grupo-controle foram submetidas a colposcopia...; Analyzing the efficiency of electrocoagulation as therapeutics in patients carrying high degree squamous intraepithelial lesion of the uterine cervix. Patients and methods: 116 patients carrying high risk intraepithelial lesion of the uterine cervix were prospectively studied, randomly distributed, being 49 patients in the study-group and 67 patients in the control-group. Both groups were evaluated according to age...

Pre-purificação por eletrocoagulação de proteina sGFP produzida em folhas de Nicotiana benthamiana transgenica; Pre-purification of recombinant sGFP produced in Nicotiana benthamiana leaves by electrocoagulation

Goran Robic
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/09/2009 PT
Relevância na Pesquisa
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A técnica de eletrocoagulação tem sido usada basicamente em tratamento de água potável e águas residuais. Neste trabalho propusemos o uso desta técnica na recuperação e purificação (RPB) de proteínas recombinantes produzidas em plantas geneticamente modificadas. O desafio principal da RPB de uso de plantas como biorreatores é a presença de clorofila e polifenóis nos seus extratos, que causam precipitação e desnaturação das proteínas de interesse, além de danificarem membranas e géis de separação. Portanto, a remoção destes compostos é essencial. No presente trabalho estudou-se a aplicação de eletrocoagulação para clarificar extratos de folhas de Nicotiana benthamiana transgênica removendo a clorofila e polifenóis, sem remover a proteína recombinante sGFP (proteína verde fluorescente sintética). Primeiramente foi necessário desenvolver um método de determinação e quantificação de sGFP baseado na fluorescência intrínseca desta proteína. Os problemas com a fluorescência de fundo presente nos extratos de folhas de N. benthamiana e o aumento de intensidade da fluorescência da sGFP nestes extratos – provavelmente o resultado de dimerização de moléculas de sGFP promovida por composto(s) do extrato – por nós observados...

Tratamento do efluente do biodiesel utilizando a eletrocoagulação/flotação: investigação dos parâmetros operacionais

Meneses,Janaina Moreira de; Vasconcelos,Robelsa de Fátima; Fernandes,Thalys de Freitas; Araújo,Gilmar Trindade de
Fonte: Sociedade Brasileira de Química Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 PT
Relevância na Pesquisa
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Electrocoagulation/flotation process was applied to treat biodiesel wastewater using aluminium electrodes. Firstly, a literature survey was conducted to choose the process variables and then, operational parameters including initial pH, electrode distance and reaction time were tested. Experimental results showed the best parameter that can be used in a factorial design for further studies. The results indicate that electrocoagulation/flotation is very efficient to reduce oil and grease, the effluent was very clear after treatment and small amount of sludge was produced.

Organic matter removal from oil-water emulsions by electrocoagulation - 1: thermodynamic analysis

Rangel,Rodolfo Maia; Carvalho,Roberto José de; Torem,Maurício Leonardo
Fonte: Escola de Minas Publicador: Escola de Minas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2013 EN
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A thermodynamic analysis of the organic matter (chemical oxygen demand - COD) removal from synthetic oil-water emulsions by the electrocoagulation process was performed with the objective of determining the most stable ionic species under diverse pH and aluminum concentration conditions and identifying possible removal mechanisms. The analysis suggests that the predominant species during the reactive stage are the amorphous aluminum hydroxide (for the mononuclear speciation of aluminum) and the positively charged trimeric species, Al3(OH)45+ (for the polynuclear speciation of aluminum). The emulsion destabilization probably occurs by charge neutralization, carried out jointly by the polynuclear species and by positively charged aluminum hydroxide. This sorption mechanism is likely to be the primary coagulation mechanism during the reactive stage. The formation of aluminum hydroxide and/or oxide during the stabilization stage may also take place, which indicates the gradual change of the dominant removal mechanism to sweep flocculation.

Organic matter removal from oil-water emulsions by electrocoagulation: 2 - mathematical model

Rangel,Rodolfo Maia; Carvalho,Roberto José de; Torem,Maurício Leonardo
Fonte: Escola de Minas Publicador: Escola de Minas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2014 EN
Relevância na Pesquisa
387.67324%
A mathematical model of the organic matter (chemical oxygen demand - COD) removal from synthetic oil-water emulsions by the electrocoagulation process was developed to evaluate the COD abatement. The model comprises the three fundaments of electrocoagulation: electrochemistry, coagulation and flotation. By comparing the experimental and calculated values of COD, it was found that the model was able to adequately predict the concentrations of organic matter (COD) present in the emulsions and satisfactorily describe the electrocoagulation process.

Does bipolar electrocoagulation time affect vessel weld strength?

Harrison, J D; Morris, D L
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /02/1991 EN
Relevância na Pesquisa
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The value of the bipolar electrocoagulator in the haemostasis of bleeding ulcers is controversial. We have therefore investigated the effect of different coagulation times on vessel weld strength achieved by the bipolar device. Welds were then made in vessels of known diameter using a standard 10F endoscopic haemostatic probe at coagulation times of two and 20 seconds. The intravascular temperature achieved at each time was measured. Vessel weld strength achieved by bipolar electrocoagulation was much greater at 20 seconds (approximately twice that at two seconds) and was highly significantly greater at all vessel diameters. There was a gradual reduction in weld strength with increasing vessel diameter, an effect that was seen for both two and 20 seconds of electrocoagulation. Intravascular temperature was significantly higher at 20 seconds than at two seconds. We conclude that vessel weld strength is related to coagulation time and that any future studies comparing the bipolar electrocoagulator with other haemostatic devices should use longer periods of bipolar electrocoagulation and record the coagulation time in order to optimise the clinical value of the device.

In vivo layer visualization of rat olfactory bulb by a swept source optical coherence tomography and its confirmation through electrocoagulation and anatomy

Watanabe, Hideyuki; Rajagopalan, Uma Maheswari; Nakamichi, Yu; Igarashi, Kei M.; Madjarova, Violeta Dimitrova; Kadono, Hirofumi; Tanifuji, Manabu
Fonte: Optical Society of America Publicador: Optical Society of America
Tipo: Artigo de Revista Científica
Publicado em 15/07/2011 EN
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Here, we report in vivo 3-D visualization of the layered organization of a rat olfactory bulb (OB) by a swept source optical coherence tomography (SS-OCT). The SS-OCT operates at a wavelength of 1334 nm with respective theoretical depth and lateral resolutions of 6.7 μm and 15.4 μm in air and hence it is possible to get a 3D structural map of OB in vivo at the micron level resolution with millimeter-scale imaging depth. Up until now, with methods such as MRI, confocal microscopy, OB depth structure in vivo had not been clearly visualized as these do not satisfy the criterion of simultaneously providing micron-scale spatial resolution and imaging up to a few millimeter in depth. In order to confirm the OB’s layered organization revealed by SS-OCT, we introduced the technique of electrocoagulation to make landmarks across the layered structure. To our knowledge this is such a first study that combines electrocoagulation and OCT in vivo of rat OB. Our results confirmed the layered organization of OB, and moreover the layers were clearly identified by electrocoagulation landmarks both in the OCT structural and anatomical slice images. We expect such a combined study is beneficial for both OCT and neuroscience fields.

Slaughterhouse Wastewater Treatment by Combined Chemical Coagulation and Electrocoagulation Process

Bazrafshan, Edris; Kord Mostafapour, Ferdos; Farzadkia, Mehdi; Ownagh, Kamal Aldin; Mahvi, Amir Hossein
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 29/06/2012 EN
Relevância na Pesquisa
283.62678%
Slaughterhouse wastewater contains various and high amounts of organic matter (e.g., proteins, blood, fat and lard). In order to produce an effluent suitable for stream discharge, chemical coagulation and electrocoagulation techniques have been particularly explored at the laboratory pilot scale for organic compounds removal from slaughterhouse effluent. The purpose of this work was to investigate the feasibility of treating cattle-slaughterhouse wastewater by combined chemical coagulation and electrocoagulation process to achieve the required standards. The influence of the operating variables such as coagulant dose, electrical potential and reaction time on the removal efficiencies of major pollutants was determined. The rate of removal of pollutants linearly increased with increasing doses of PACl and applied voltage. COD and BOD5 removal of more than 99% was obtained by adding 100 mg/L PACl and applied voltage 40 V. The experiments demonstrated the effectiveness of chemical and electrochemical techniques for the treatment of slaughterhouse wastewaters. Consequently, combined processes are inferred to be superior to electrocoagulation alone for the removal of both organic and inorganic compounds from cattle-slaughterhouse wastewater.

Clinical analysis of bronchoscopic electrocoagulation in pediatric patients

Ni, Caiyun; Yu, Huafeng; Han, Xiaorong; Meng, Chen; Zhang, Yanqing
Fonte: e-Century Publishing Corporation Publicador: e-Century Publishing Corporation
Tipo: Artigo de Revista Científica
Publicado em 15/12/2014 EN
Relevância na Pesquisa
290.59566%
This study is to explore the efficacy and safety of bronchoscopic electrocoagulation treatment for pediatric disease of poor ventilation. Seventy pediatric patients of airway stenosis and obstruction as well as pharyngeal and laryngeal cysts received bronchoscopic electrocoagulation treatment, including 15 cases of epiglottic cyst, 13 cases of cicatricial hyperplasia of fibrous tissue after trachea intubation, 5 cases of foreign body in bronchus and 37 cases of endobronchial tuberculosis. Before and after the last electrocoagulation treatment, treatment efficacy was evaluated by examining the patients’ clinical presentations and lesions in airway under bronchoscope, examining chest CT and pulmonary function, and estimating pulmonary atelectasis and ventilation function. Seventy cases of pediatric patients were treated by bronchoscopic electrocoagulation, with the total treatment number of 106 times. Among them, 66 cases were treated with marked efficacy and 4 cases were with effective treatment. There was no invalid treatment. The treatment efficacy was 100% without complications. Bronchoscopic electrocoagulation treatment is a fast, effective and safe therapeutic method in treating airway stenosis and obstruction, such as foreign body in bronchus...

Basic Principles and Future Aspects of Thermal Fusion and Electrocoagulation – Experimental studies in in-vitro and in-vivo rodent, porcine and human models; Grundlegende Prinzipien und zukünftige Aspekte der Thermofusion und Elektrokoagultion - Experimentelle Studie in in-vitro und in-vivo Tiermodellen sowie in humanen Modellen

Wallwiener, Christian Wilhelm
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
EN
Relevância na Pesquisa
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Bipolar vessel sealing and electrosurgery in general is pivotal in surgical and especially minimally-invasive surgical hemostasis. However, quality of vessel sealing is only suboptimal and major coaptive desiccation parameters have yet to be investigated in depth. Moreover, the potentially hazardous capacity of electrosurgery to induce both post-operative adhesions and thermal complications such as tissue necrosis has not been looked into in detail hitherto. In order to (1) optimize bipolar vessel sealing, to (2) better understand the biothermomechanics of thermal fusion, to (3) analyze the relationship between electrocoagulation and adhesion formation and to (4) develop a human in-vivo in-situ model for quantifying electrosurgery-induced thermal tissue effects and thermal tissue damage, the following studies were conducted. It was found that in an isolated porcine renal artery model, self-regulating modulation of energy-based vessel coagulation achieved superior thermal fusion of vascular tissue than CPC. This promising novel technique should therefore be further analyzed to determine its in-vivo efficacy in long-term studies. Moreover it was ascertained that compressive pressure during coaptation determines the seal quality. Upper and lower pressure boundaries for safe coaptation exist for both arteries and veins. Vessel sealing by thermal conduction without electrical current effects is possible but represents a less effective method for coaptation. These findings have implications for the rational design of new electrosurgical instruments. With regards to the adhesiogenic potential of bipolar tissue desiccation...

The efficiency of electrocoagulation using aluminum electrodesin treating wastewater from a dairy industry

Valente,Gerson de Freitas Silva; Mendonça,Regina Célia Santos; Pereira,José Antônio Marques
Fonte: Universidade Federal de Santa Maria Publicador: Universidade Federal de Santa Maria
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2015 EN
Relevância na Pesquisa
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This research deals with the investigation of electrocoagulation (EC) treatment of wastewater from a dairy plant using aluminum electrodes. Electrolysis time, pH, current density and distance between electrodes were considered to assess the removal efficiency of chemical oxygen demand (COD), total solids (TS) and their fractions and turbidity. Samples were collected from the effluent of a dairy plant using a sampling methodology proportional to the flow. The treatments were applied according to design factorial of half fraction with two levels of treatments and 3 repetitions at the central point. The optimization of parameters for treating dairy industry effluent by electrocoagulation using aluminum electrodes showed that electric current application for 21 minutes, an initial sample pH near 5.0 and a current density of 61.6A m-2 resulted in a significant reduction in COD by 57%; removal of turbidity by 99%, removal of total suspended solids by 92% and volatile suspended solids by 97%; and a final treated effluent pH of approximately 10. Optimum operating condition was used for cost calculations show that operating cost is approximately 3.48R$ m-3.

Heavy metals removal from aqueous environments by electrocoagulation process– a systematic review

Bazrafshan, Edris; Mohammadi, Leili; Ansari-Moghaddam, Alireza; Mahvi, Amir Hossein
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 26/10/2015 EN
Relevância na Pesquisa
283.62678%
Heavy metals pollution has become a more serious environmental problem in the last several decades as a result releasing toxic materials into the environment. Various techniques such as physical, chemical, biological, advanced oxidation and electrochemical processes were used for the treatment of domestic, industrial and agricultural effluents. The commonly used conventional biological treatments processes are not only time consuming but also need large operational area. Accordingly, it seems that these methods are not cost-effective for effluent containing toxic elements. Advanced oxidation techniques result in high treatment cost and are generally used to obtain high purity grade water. The chemical coagulation technique is slow and generates large amount of sludge. Electrocoagulation is an electrochemical technique with many applications. This process has recently attracted attention as a potential technique for treating industrial wastewater due to its versatility and environmental compatibility. This process has been applied for the treatment of many kinds of wastewater such as landfill leachate, restaurant, carwash, slaughterhouse, textile, laundry, tannery, petroleum refinery wastewater and for removal of bacteria, arsenic, fluoride...

DEFLUORIDATION OF DRINKING WATER BY ELECTROCOAGULATION/ELECTROFLOTATION - KINETIC STUDY (doi: 10.4090/juee.2010.v4n1.037045)

Mounir, Bennajah; Maalmi, Mostafa; Darmane, Yassine; Touhami, Mohammed Ebn
Fonte: JUEE Press Publicador: JUEE Press
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 11/01/2011 ENG
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Avariable order kinetic (VOK) model derived from the langmuir-frundlich equation was applied to determine the kinetics of fluoride removal reaction by electrocoagulation (EC). Synthetic solutions were employed to elucidate the effects of the initial fluoride concentration, the applied current and the initial acidity on the simulation results of the model. The proposed model successfully describes the fluoride removal in Airlift reactor in comparison with the experimental results. In this study two EC cells with the same capacity (V=20 L) were used to carry out defloration with aluminium electrodes, the first is a stirred tank reactor (STR) the second is an airlift reactor (ALR). The comparison of energy consumption demonstrates that the (ALR) is advantageous for carrying out the defluoridation removal process.

Electrocoagulation to Remove Silica from Cooling Towers Water

Villegas-Mendoza,Iván Emmanuel; Martín-Domínguez,Alejandra; Pérez-Castrejón,Sara; Gelover-Santiago,Silvia Lucila
Fonte: Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información Publicador: Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
383.6268%
This paper presents the results of a study carried out about the effect of water quality on the removal of dissolved silica using an electrocoagulation process with aluminum electrodes. Silica is found in replacement water (RW), usually known as make up water, and in cooling tower blowdown water (CTBW). Tests were conducted on a small pilot scale (~2 lmin-1) with a continuous flow device. The treatment train consisted of electrocoagulation (EC), flocculation, sedimentation and sand filtration. Two distinct RW and two CTBW with different physicochemical characteristics were studied. The response variables analyzed were: efficiency of aluminum to remove silica (ratio mgl-1 of dosed Al3+/mgl-1 SiO2 removed), removal efficiency of dosed Al3+, hydraulic head loss throughout the electrochemical reactor and voltage. The cost of the treatment for the four types of water is discussed. The ratio mgl-1 Al3+ dosed /mgl-1 silica removed ranged from 1.09 ± 0.06 to 1.33 ± 0.05 when treating RW and 0.85 ± 0.1 when treating CTBW. The consumption costs of energy, chemicals and electrodes for RW treatment ranged from US$ 0.52 to 0.74 m-3, and was approximately US$0.53 m-3 for CTBW.

Removal of Color and Chemical Oxygen Demand Using a Coupled Coagulation-Electrocoagulation-Ozone Treatment of Industrial Wastewater that Contains Offset Printing Dyes

Roa-Morales,Gabriela; Barrera-Díaz,Carlos; Balderas-Hernández,Patricia; Zaldumbide-Ortiz,Francisco; Reyes Perez,Horacio; Bilyeu,Bryan
Fonte: Sociedad Química de México A.C. Publicador: Sociedad Química de México A.C.
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
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Industrial offset printing processes generate wastewater with highly colored obtaining values of 5x10(6) Pt-Co units and great values of chemical oxygen demand (COD) 5.3x10−5 mg L−1. Thus, conventional technologies such as biologicals treatment fail in reaching the discharge limits. In this research, a sequential treatment was applied: coagulation with aluminum hydroxychloride (AHC), electrocoagulation with Al anodes and finally ozonation. Optimal conditions are found when adding 20 mg L−1 AHC, followed by electrocoagulation at 4 A for 50 min, and finally alkaline ozonation for 15 min, resulting in an overall color removal of 99.99% color and 99.35% COD.

Electrocoagulation and Anodic Oxidation Integrated Process to Treat Leachate from a Portuguese Sanitary Landfill

Norma,D.; Fernandes,A.; Pacheco,M.J.; Ciríaco,L.; Lopes,A.
Fonte: Sociedade Portuguesa de Electroquímica Publicador: Sociedade Portuguesa de Electroquímica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2012 EN
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The electrochemical treatment of leachate samples from a Portuguese intermunicipal sanitary landfill was carried out using combined electrocoagulation/anodic oxidation processes. The electrocoagulation (EC) was performed with iron consumable anodes, at different initial pH, with and without stirring, at different applied potentials. In the anodic oxidation (AO) assays, a boron-doped diamond anode was used and applied current densities of 10 to 30 mA/cm² were tested. The influence of the experimental conditions of the electrocoagulation pretreatment on the anodic oxidation performance was also assessed. In the EC assays the lowest iron and energy consumptions per mass of organic load removed were obtained at initial pH of 4 in the unstirred assays. In the combined treatments, the highest average current efficiency in the anodic oxidation was obtained for the samples with EC pretreatment performed at pH of 6. For the combined treatment with EC pretreatment run at natural pH of 8.6, an increase in AO current density led to a decrease in average current efficiency.

Electrocoagulation and Anodic Oxidation as a Complement of Biological Treatment of Sanitary Landfill Leachates

Norma,D.; Fernandes,A.; Ciríaco,L.; Pacheco,M.J.; Lopes,A.
Fonte: Sociedade Portuguesa de Electroquímica Publicador: Sociedade Portuguesa de Electroquímica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2012 EN
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The electrochemical treatment of leachate samples collected in a Portuguese intermunicipal sanitary landfill was carried out using combined electrocoagulation followed by anodic oxidation processes. Samples were collected after the biological treatment of the in situ plant and in permeate of an ultrafiltration operation, located after the biological treatment. Electrocoagulation was performed with iron consumable anodes, at different initial pH, with and without stirring, at different applied potentials. In the anodic oxidation assays a boron-doped diamond anode was used and applied current densities from 100 to 300 A m-2 were tested. The influence of the experimental conditions of the electrocoagulation pretreatment on the anodic oxidation performance was also assessed. In the electrocoagulation assays the lowest iron and energy consumptions per mass of organic load removed were obtained at initial pH of 4 for the samples collected after the biological treatment and at initial pH of 6 for the sample collected in the ultrafiltration permeate, all in the unstirred assays. In the anodic oxidation, the highest average current efficiencies were obtained in the assays run at lower current density, being higher for the samples collected after the biological treatment. For both type of samples...