Ex Situ Electroreclamation of Heavy Metals Contaminated Sludge: Pilot Scale Study

Zagury, Gérald J.; Dartiguenave, Yves; Sétier, Jean-Claude

doi:10.1061/(asce)0733-9372(1999)125:10(972)

Cited by 37 publications

(20 citation statements)

References 23 publications

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“…Also the iron content of the sludge was quite important, reaching 14 g/kg; concerning manganese, its content was nearly 400 mg/kg: in addition to its potential toxicity, Mn is important because it can affect the mobility of other metals such as Zn, Cu, and Ni [18].…”

Section: Metal Concentrations In Sludge Samplesmentioning

confidence: 99%

“…In addition, the low operational costs and potential applicability to a wide range of contaminants [9] have suggested a number of case studies of waste remediation [10][11][12][13][14][15][16][17][18]. The electrokinetic approach generally requires low-level DC current densities in the order of a few mA/cm 2 between suitably located electrodes, which anyway induce physicochemical changes in the applied media, leading to species transport by coupled mechanisms, such as electromigration, electroosmosis and electrophoresis, which take place together with the electrolysis of water at electrodes [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Electrokinetic extraction of surfactants and heavy metals from sewage sludge

Ferri

Ferro

Martínez‐Huitle

et al. 2009

Electrochimica Acta

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Section: Metal Concentrations In Sludge Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrokinetic extraction of surfactants and heavy metals from sewage sludge

Ferri

Ferro

Martínez‐Huitle

et al. 2009

Electrochimica Acta

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“…A solidificação deste material, no entanto, torna-se muito volumosa e o procedimento requer grandes espaços 16 . Outro método consiste na remoção dos metais pesados tóxicos por métodos como a extração iônica 17,18 , eletroquímica 19 , quími-ca 20 ou biológica 21,22 . Utilizando-se um método químico ou bioló-gico, a remoção seletiva torna o resíduo não perigoso e possibilita a concentração e reciclagem dos metais 23 .…”

Section: Introductionunclassified

Emprego de planejamento fatorial no desenvolvimento de uma metodologia para extração de zinco de resíduos galvânicos

Olivier¹,

Silva²,

Motta³

et al. 2007

Quím. Nova

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Recebido em 2/10/06; aceito em 18/1/07; publicado na web em 25/9/07 USE OF FACTORIAL PLANNING IN DEVELOPING A METHODOLOGY FOR GALVANIC ZINC RESIDUE EXTRACTION. The plating process generates solid waste rich in heavy metals and aiming to reduce environmental impact of such waste, this work suggests a methodology for zinc reduction, through a 2 4 factorial planning, studying the influence of the following variables: acid concentration (15, 20 or 30% v/v), acid type (sulfuric or hydrochloric), acid volume (15, 20 or 25 mL) and extraction time (12, 24 or 36 h). Through this methodology it is possible to establish the optimal conditions (15 mL of a 30% hydrochloric acid concentration during 12 h) to get a 100% efficiency in zinc extraction.Keywords: electroplating; galvanic sludge; zinc. INTRODUÇÃOO homem é hoje um poderoso agente de alteração dos ciclos naturais, visto que as principais conquistas da humanidade introduziram perturbações no equilíbrio da biosfera, alterando ecossistemas vitais. O desenvolvimento tecnológico, com a criação de novas substâncias e produtos, muitas vezes descartáveis, vem contribuindo para uma aceleração dessa degradação. Em decorrência disto, jamais alguma civilização teve em âmbito planetário o poder desestabilizador que tem a sociedade contemporânea. As mudanças ambientais em curso estão concentradas em poucas décadas, possuem escopo global e estão profundamente relacionadas com o comportamento humano 1 . Podemos citar diversos fatores que contribuem para a agressão ambiental na sociedade contemporânea, dentre os quais o esgotamento dos recursos naturais, um conjunto de valores e comportamentos centrados na expansão do consumo material e sistemas produtivos que utilizam processos de produção poluentes 1 que, aliados ao crescimento populacional acelerado, têm contribuído para o aumento da produção de resíduos que precisam ser descartados para dar lugar a novos bens, formando um ciclo de agressão ao ambiente 2 . O destino dos resíduos sólidos é uma questão de saúde pública e considera-se sua disposição como a etapa final dos processos industriais, em que os produtos mobilizados pelo homem para a satisfação de diversas necessidades são devolvidos ao ambiente. A área física que serve como depósito, seja o vazadouro a céu aberto, aterro controlado ou sanitário, não pode ser considerada como o ponto final para muitas substâncias contidas nos resíduos sólidos, uma vez que estas podem atingir solo, água ou ar, sendo transportadas para outras áreas podendo, até mesmo, entrar na cadeia alimentar e atingir o homem 3 . Várias indústrias têm gerado grandes quantidades de poluentes que, em muitos casos, têm sido descartados no meio ambiente sem nenhum tipo de tratamento 4 . A principal razão deste comportamento consiste na falta de investimentos na busca de técnicas para o tratamento dos efluentes industriais.Efluentes saturados com sais de metais pesados são inerentes a vários processos industriais, como fabricação de certos pigmentos, recobrimento de peças metálicas etc 5 . Entre os inúmeros p...

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“…In addition, the electrokinetic treatment has been recognized as an efficient in situ process for the remediation of many soils contaminated with heavy metals Deng and Jennings 2006;Amrate et al 2005;Sawada et al 2004;Chinthamreddy 2003, 2004;Page and Page 2002;Alshawabkeh et al 1999;Zagury et al 1999;Reddy et al 1997) and soils contaminated with both metals and organics Maturi and Reddy 2006;Reddy and Karri 2006). However, limited studies have investigated the application of the electrokinetic treatment of PCP-contaminated soils (Kim et al 2000).…”

mentioning

confidence: 98%

Electrokinetic Remediation of Pentachlorophenol Contaminated Clay Soil

Reddy

Darko-Kagya

Al-Hamdan

2011

Water Air Soil Pollut

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This paper presents a bench-scale experimental study performed to investigate the remediation of low permeable soil contaminated with pentachlorophenol (PCP) using the electrokinetic technique. A total of six electrokinetic tests were performed using kaolin soil spiked with 100 mg/kg of PCP. The first three tests were performed with an applied voltage gradient of 1 VDC/cm, where each test employed one of the three different flushing solutions: deionized water, electrolyte, or buffered electrolyte. The other three tests were performed using the same electrolyte solution, but each employed voltage gradient of 2 VDC/cm under constant and periodic application modes and constant voltage gradient with electrode liquid recirculation. The results of this study showed that PCP can be degraded in an electrokinetic system due to the direct electrochemical reduction process at the electrodes. The degradation of PCP ranged from 52% to about 78% depending on the conditions present. As the applied voltage gradient across the PCP-contaminated soil increased, the electroosmotic flow and PCP migration toward the cathode increased, resulting in higher PCP degradation by the direct reduction process. In the tests with electrolyte flushing solution, PCP degradation was about 58% and 65% under the applied voltage gradients of 1 and 2 VDC/cm, respectively. The mode of application of voltage potential across the PCP-contaminated soil showed noticeable effect on the system pH and electroosmotic flow and hence the PCP degradation. The highest PCP degradation (i.e., 78%) was in the test with constant 2 VDC/cm voltage gradient and recirculation application. Overall, this study demonstrated that electrokinetic technology has the potential to remediate PCP-contaminated clay soils by the direct reductive process. The electroosmatic flow as well as degree of PCP degradation during electrokinetics depend on the applied potential gradient and properties of the aqueous phase such as pH, ionic strength, and presence of carbonates.

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Ex Situ Electroreclamation of Heavy Metals Contaminated Sludge: Pilot Scale Study

Cited by 37 publications

References 23 publications

Electrokinetic extraction of surfactants and heavy metals from sewage sludge

Electrokinetic extraction of surfactants and heavy metals from sewage sludge

Emprego de planejamento fatorial no desenvolvimento de uma metodologia para extração de zinco de resíduos galvânicos

Electrokinetic Remediation of Pentachlorophenol Contaminated Clay Soil

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