Ozone generation by silent electric discharge and its application in tertiary treatment of tannery effluent

Balakrishnan, P. A.; Arunagiri, A.; Rao, Paruchuri G.

doi:10.1016/s0304-3886(02)00031-1

Cited by 49 publications

(23 citation statements)

References 5 publications

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“…4) showed stimulation of the bioluminescence (values >100%) possibly due to the presence of organic compounds. Anaerobic lagoons cause sedimentation of suspended solids, partial conversion of COD to methane gas and conversion of sulphide into sulphates and production of biological sludge [34]. Further scrutiny in the Fig.…”

Section: Remediation and Controlmentioning

confidence: 99%

Pollution Control and Remediation of the Tanning Effluent

Mwinyihija¹

2012

TOEPTJ

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Recent advances have been recorded in the tanning industry with biotechnology in principle playing a very important role through related applied research. This review paper demonstrates that a previously tagged tanning sector as the most hazardous can be resolved through adoption of cleaner technologies, waste management and remedial measures that can be put in place. Pollution is depicted stepwise along the leather processing phases with a selected xenobiotic and contaminants identified such as Sodium chlorides, Chromium, Sulphates, Chlorinated phenolics etc. As an interventionist strategy, biological tools using novel techniques of investigation are shown including the aquatic ecosystems. Remedial methods using known threshold in an identified tannery in Kenya is used to comprehend how to scale down the pollutants eventually. However it is recognised that though phytoremediation potential exist, it will require a combination of several other recently developed methods to provide a much firmer basis of controlling pollution loads related to the tanning Industry.

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Section: Remediation and Controlmentioning

confidence: 99%

Pollution Control and Remediation of the Tanning Effluent

Mwinyihija¹

2012

TOEPTJ

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“…Devido à instabilidade do ozônio, aproximadamente 3 s na fase gasosa, o que impede sua armazenagem, torna-se necessária sua geração in situ 6 . Ozônio pode ser produzido por três diferentes técni-cas: exposição do O 2 à luz ultravioleta, eletrólise do ácido perclórico e descarga eletroquímica 7 . Dentre os diferentes processos de produção apresentados, o que utiliza descarga elétrica (também conhecido por efeito corona) é o mais utilizado pela maioria dos ozonizadores comerciais, principalmente pelo fato de se obter maior taxa de conversão do oxigênio em ozônio.…”

Section: Introductionunclassified

“…Neste método, o ozônio é gerado pela passagem de ar ou oxigênio puro entre dois eletrodos submetidos a uma elevada diferença de potencial (aproximadamente 10 kV), conforme Equações 1 e 2. O rendimento deste processo varia entre 1 e 4% (m/m) e entre 6 e 14% (m/m) para sistemas alimentados por ar e oxigênio puro, respectivamente 5,7,8 .…”

Section: Introductionunclassified

Tratamento de efluentes industriais por processos oxidativos na presença de ozônio

Almeida¹,

Assalin²,

Rosa³

et al. 2004

Quím. Nova

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“…In the process of leather tanning, chromium salts are responsible for the interlacement of the protein fibers of the animal skin, transforming it into a product of high durability that is resistant to deterioration. This stage is fundamental in the production of leathers; large amounts of these salts are used, and consequently, a great volume of chromium is released in the final discharge (Balakrishnan et al, 2002;Freitas, 2006;Scapini, 2007). However, this metal is extremely toxic, and its concentration is limited to 0.1 mg/L for hexavalent chromium and 1 mg/L to trivalent chromium for discharge in waters, in agreement with the legislation of CONAMA (Resolution CONAMA no.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hexavalent chromium removal in a continuous biological filter with the use of central composite design (CCD)

Dalcin

Pirete

Lemos

et al. 2011

Journal of Environmental Management

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Hexavalent chromium is frequently found in industrial effluents as a result of the industrial applications of this compound and its anti-corrosive features. However, hexavalent chromium is extremely toxic, and its discharge in water is regulated, with a maximum limit of 0.1 mg/L in accordance with legislation established by CONAMA-Brazil (no. 397, April 3, 2008). To achieve lower discharge values, it is necessary to reduce from Cr(VI) to Cr(III), which is less toxic, and an economic alternative involves biological removal of this compound. Residence time distributions (RTDs) were measured to evaluate the behavior of actual biofilter operation conditions in a biofilter flow. The medium residence time distributions used were 8 and 24 h (recommended by the legislation). To optimize this process, a central composite design was used, considering the initial chromium concentration and pH as the independent variables and the removal of hexavalent chromium as the response. The boundary curves and surface response showed optimal behavior at 3.94 mg/L [Cr(0)] and a pH of 6.2. The removal process of hexavalent chromium is mathematically described by the Michaelis-Menten kinetic model. This model appropriately represents the variation of chromium concentration along the bioreactor.

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Ozone generation by silent electric discharge and its application in tertiary treatment of tannery effluent

Cited by 49 publications

References 5 publications

Pollution Control and Remediation of the Tanning Effluent

Pollution Control and Remediation of the Tanning Effluent

Tratamento de efluentes industriais por processos oxidativos na presença de ozônio

Evaluation of hexavalent chromium removal in a continuous biological filter with the use of central composite design (CCD)

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