Distillery spent wash: Treatment technologies and potential applications

Mohana, Sarayu; Acharya, Bhavik K.; Madamwar, Datta

doi:10.1016/j.jhazmat.2008.06.079

Cited by 357 publications

(232 citation statements)

References 122 publications

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“…It is estimated that the mid-south region of Brazil produced a total of 2.30 billion L of ethanol (anhydrous and hydrated) because of its valuable mineral content (Silva, Griebeler, & Borges, 2007). However, due to the toxic organic compounds that it contains, such as phenol derivatives and brown-colored polymers (melanoidin), both compound classes that show chemical stability and are hard to decompose in the environmental conditions, this is not an environmentally correct waste management (Mohana, Acharya, & Madamwar, 2009). Additionally, skatol and other sulfur compounds are also undesirable due to their unpleasant smell (Sharma et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Acid pH and high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) contribute to the recalcitrant nature of vinasse, which is classified as a persistent organic pollutant. Traditional wastewater treatment methodologies are unable to eliminate or transform vinasse into less toxic products (Mohana et al, 2009). Therefore, the ethanol-sugar industry has been forced to search new wastewater treatments that ally economic benefits and efficiency (Andreozzi et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO2

Souza¹,

Lima

Pezoti

et al. 2016

Acta Sci. Technol.

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ABSTRACT. In this work, the effect of vinasse pre-treatment and anatase content in the photocatalytic degradation of sugarcane vinasse was evaluated. The in nature vinasse was pretreated by coagulation/flocculation using vegetal tannin as coagulant and diluted 1: 2 with deionized water. The photocatalytic tests with in nature, pretreated and diluted vinasse were performed for 48 hours under UV radiation using 1 g of catalyst: TiO 2 Kronos calcined at 300 o C (100% anatase) and 1000 o C (34% anatase) and TiO 2 P25 (87% anatase). The process of coagulation/flocculation removed about 50, 85 and 97% of COD, color and turbidity of in nature vinasse, respectively. The results showed that despite the slight COD decrease of in nature vinasse, its toxicity was significantly reduced after photocatalytic treatment, especially when TiO 2 -34 and TiO 2 -87 were used. This behavior shows that the mixture of anatase and rutile phases showed a positive synergistic effect. Regarding pre-treatment of vinasse, the coagulation/flocculation process was more efficient, promoting the greatest reductions of COD (67%) and toxicity (up to 10 times).Keywords: vinasse, coagulation/flocculation, photocatalysis, toxicity.Fotodegradação da vinhaça: avaliação do efeito do pré-tratamento da vinhaça e da fase cristalina do TiO 2 RESUMO. Neste trabalho, foi avaliado o efeito do pré-tratamento da vinhaça e do teor de anatase na degradação fotocatalítica da vinhaça. A vinhaça in natura foi pré-tratada por coagulação/floculação usando tanino vegetal como coagulante e diluição 1:2 com água deionizada. Os testes fotocatalíticos com a vinhaça in natura, pré-tratada e diluída foram realizados durante 48h sob radiação UV utilizando 1 g de catalisador: TiO 2 Kronos calcinado a 300 o C (100% anatase) e a 1000 o C (34% anatase) e TiO 2 P25 (87% anatase). O processo de coagulação/floculação removeu cerca de 50, 85 e 97% de DQO, cor e turbidez da vinhaça in natura, respectivamente. Os resultados mostraram que apesar da pequena redução de DQO da vinhaça in natura, sua toxicidade foi reduzida significativamente após tratamento fotocatalítico, principalmente quando TiO 2 -34 e TiO 2 -87 foram utilizados. Esse comportamento evidencia que a mistura das fases anatase e rutile apresentou efeito sinérgico positivo. Em relação ao pré-tratamento da vinhaça, o processo de coagulação/floculação se mostrou mais eficiente, promovendo as maiores reduções de DQO (67%) e toxicidade (até 10 vezes).Palavras-chave: vinhaça, coagulação/floculação, fotocatálise, toxicidade.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO2

Souza¹,

Lima

Pezoti

et al. 2016

Acta Sci. Technol.

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“…has been produced with a projection for annual growth of at least 10% (CNIT 2010); there is also a decrease in production of Tequila between 2000 and 2003, due to the agave crisis (Dalton 2005). Although exhaustive reviews regarding the treatment of different distillery wastewaters are published elsewhere (Satyawali and Balakrishnan 2008;Mohana et al 2009), it is considered that special attention should be paid to distillery effluents from the Tequila industry due to their complex composition. This section present the potential generation of energy from wastewater treatments to generate biogas from the Tequila industry.…”

Section: Bioenergy Production From Different Kinds Of Wastewatersmentioning

confidence: 99%

Biogas Production from Anaerobic Treatment of Agro-Industrial Wastewater

Olvera¹,

López-López²

2012

Biogas

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“…The critical emulsifier concentration for all extraction times was 20 g/l. The effectiveness of the bioemulsifier is evident from its low critical emulsifier concentration 15,20 . Nevertheless, autoclaving for 15 min gave the lowest bioemulsifier yield and emulsification activity value.…”

Section: Extraction Of Mannoproteinsmentioning

confidence: 99%

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Dikit¹,

Maneerat²,

Musikasang³

et al. 2010

ScienceAsia

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Saccharomyces cerevisiae KA01 was isolated from palm wine obtained from a local brewer in Songkhla province, Thailand. Mannoproteins with emulsification properties were extracted from the cell walls of S. cerevisiae KA01 cultivated in YM medium by autoclaving in a pH 7.0 citrate buffer for 60 min with a yield of 0.32 g/g wet cells. The mannoprotein extract obtained was evaluated for its chemical and physical stability to establish its potential use as a natural emulsifier in processed foods. The mannoprotein extract exhibited emulsion with the vegetable oils tested and showed emulsion activity of 65% towards palm oil as oil-in-water with a critical emulsifier concentration of 20 g/l. The mannoprotein extract had similar emulsifying properties to the commonly used food emulsifiers gum arabic and lecithin. Palm oil-in-water emulsions were stabilized over a broad range of conditions from pH 5 to 8 with up to 3% (w/v) sodium chloride and up to 0.1% (w/v) CaCl2 and MgCl2 in the aqueous phase. Temperature did not affect the emulsion activity of the mannoprotein extract. Preliminary trials showed that mannoproteins from S. cerevisiae KA01 had potential for use in salad dressing.

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Distillery spent wash: Treatment technologies and potential applications

Cited by 357 publications

References 122 publications

<b>Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO<sub>2</sub>

<b>Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO<sub>2</sub>

Biogas Production from Anaerobic Treatment of Agro-Industrial Wastewater

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