Treatment of paint manufacturing wastewater by coagulation/electrochemical methods: Proposals for disposal and/or reuse of treated water

Silva, Larissa F. da; Barbosa, Andreia D.; Paula, Heber Martins de; Romualdo, Lincoln L.; Andrade, Leonardo S.

doi:10.1016/j.watres.2016.05.006

Cited by 90 publications

(22 citation statements)

References 38 publications

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“…As shown in Figure 2, the percentage removal of turbidity from the turbid water sample was increased from 23.9% to 54% with the increment of cactus powder dosage from 0.50 to 3.50 g. This increment in removal of turbidity is due to increment of active site of the cactus powder. Similarly, the percentage removal of turbidity from turbid water by Alum is increased from 28.46% to 58.2% as the dose of Alum increased from 0.50 g to 3.50 g. A similar result was reported by da Silva et al (2016): when the dose of Al 2 (SO 4 ) 3 (mL/L) increased from 0 to 15 by 3 mL/L interval, the turbidity of the wastewater decreased from 1200 NTU to 4.5 NTU [15].…”

Section: Effect Of Cactus Dosage On Turbidity Removalsupporting

confidence: 83%

“…The use of the cactus powder as a natural coagulant has no significant variation on pH and alkalinity of treated water. In a similar way, the pH value is 7.73 at 0.50 g, 7.90 at 1.50 g, 7.67 at 2.5 g, and 7.77 at 3.50 g at different doses (mL/L) increased from 0 to 15 by 3 mL/L interval, the pH of the wastewater was decreased from 7.54 to 6.79 [15]. On the other hand, when the dosages of Alum increase from 0.50 g to 3.50 g, the final pH value of the water is significantly decreased from 6.1 to 4.18 which is acidic.…”

Section: Effect Of Cactus Dosage On Ph and Alkalinity Of Samplementioning

confidence: 58%

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Investigation of Coagulation Activity of Cactus Powder in Water Treatment

Beyene

Derbe

Dirersa

2016

Journal of Applied Chemistry

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This paper is focused on the comparative study of cactus powder, Alum, and their combination of physiochemical analyses of water sample such as TDS, pH, conductivity, salinity, and turbidity using jar test. The result indicated that percentage removal of turbidity from turbid water sample increased from 23.9% to 54% and 28.46% to 58.2% as dose increased from 0.50 to 3.50 g for both cactus powder and Alum, respectively. Cactus powder also has a marginal effect on pH value (7.33 at 0.50 g, 7.49 at 1.50 g, 7.57 at 2.50 g, and 7.57 at 3.50 g) as compared to the usage of chemical coagulants (Alum). The salinity was increased from 0.4% to 0.69 % and 0.39% to 0.98% as the dose of cactus powder and Alum increased from 0.50 g to 3.50 g, respectively. The result revealed that cactus powder is more effective in pH upholding, TDS maintenance, and salinity removal than Alum, but their combination is the most effective in terms of turbidity removal, reduction of salinity, reduction of conductivity, and reduction of TDS and has a marginal effect on dissolved oxygen (DO) value. In conclusion, the combination of Alum and cactus powder is more effective for turbidity removal, salinity removal, and pH and conductivity upholding than either of them used individually.

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Section: Effect Of Cactus Dosage On Turbidity Removalsupporting

confidence: 83%

Section: Effect Of Cactus Dosage On Ph and Alkalinity Of Samplementioning

confidence: 58%

Investigation of Coagulation Activity of Cactus Powder in Water Treatment

Beyene

Derbe

Dirersa

2016

Journal of Applied Chemistry

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“…In this way, the integration of this process to an additional treatment is necessary for removal of organic matter, oils and fats to attend the Brazilian legislation. Considering the high level of the remaining organic load in addition to toxicity, an advanced oxidation process, [26][27][28][29][30] electrochemical 31 or the coupling between advanced oxidation and biological processes, 32,33 would be the most appropriate options for the complete treatment of biodiesel wastewaters.…”

Section: +mentioning

confidence: 99%

Biodiesel Wastewater Treatment by Coagulation-Flocculation: Evaluation and Optimization of Operational Parameters

Gonçalves¹,

Neto²,

Machado³

et al. 2016

J. Braz. Chem. Soc.

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In this study the coagulation-flocculation process was evaluated as an alternative for treatment of biodiesel wastewater. The role of two coagulants, Al 3+ and Fe 3+ , as well as its dosage, pH, treatment time, stirring and aeration were evaluated. It was observed that in the treatment using Al 3+ the pH of the effluent (9.7) does not need to be adjusted, while for Fe 3+ a previous adjustment to pH 5.0 was necessary. On the other hand, a high concentration of Al 3+ (243 mg L -1) and a relatively long treatment time (70 min) were required to reach more than 96% of turbidity removal, when compared to the processing using Fe 3+ (56 mg L -1 and 53 min), attributed to the formation of different mole fractions of hydrolyzed cationic species. Under the optimized conditions, more than 96% of turbidity, apparent color and suspended solids, and 82% of oil and fats were removed. Keywords: aluminum sulfate, biodiesel effluent, ferric chloride, physical-chemical treatment, turbidity IntroductionThe quality of the biodiesel is directly dependent on its refinement process, which produces large volumes of wastewater inappropriate for disposal in water bodies. [1][2][3][4] In general, biodiesel wastewater is characterized by expressive values of chemical oxygen demand (COD) and biochemical oxygen demand (BOD 5 ), respectively between 9,500 and 230,000 mg L -1 and 1,650 and 3,200 mg L -1 , due the presence of glycerin, alcohols (methanol and/ or ethanol), oil, fats and other contaminants; 5 turbidity between 189 and 2,550 NTU; oils and fats between 124 and 7,200 mg L -1 ; color between 361 and 1,500 mg Pt-Co L -1 ; total solids between 3.7 and 25 g L -1 ; residual methanol between 8 and 29% (m/m) and residual glycerin between 0.6 and 1.6 (m/m). 3,4 In terms of oils and fats, the Brazilian legislation establishes as 50 mg L -1 the maximum disposal limit for wastewaters derived from the production of biodiesel.6 So, it is extremely important the study and proposition alternative processes for the efficient treatment of this kind of wastewater. This is a research field relatively new, once the first studies on biodiesel wastewater treatment started on 2005. 4 Three reviews on biodiesel wastewater treatment have been recently published. 1,4,5 One of them summarizes a significant number of possible processes and discusses their advantages and disadvantages as well as the possibilities of application for the improvement of the treatment of biodiesel wastewaters. The improvement of the operational parameters of the coagulation-flocculation process, based on the coupling of acidification and coagulation, has been pointed as promisor for this purpose. 4 Since biodiesel wastewaters contain soaps (presence of polar anionic and nonionic groups), oils and fats (presence of carboxylic groups), the cycle of emulsificationdemulsification tends to be strongly pH dependent. Low pH values favor the demulsification through the reduction of the electrical forces or by the commitment of the electrical double-layer, 7 with the opposite effect at...

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“…O Instituto Brasileiro de Geografia e Estatística (IBGE, 2010), também estima que neste mesmo período, a população brasileira será de aproximadamente 259,8 milhões de pessoas, em virtude do desenvolvimento de novas tecnologias médicas, além de cuidados e preocupação com a saúde, o que não ocorria com tanta frequência nas décadas anteriores. Com esta demanda, cresce também o consumo de água para abastecimento público e industrial, gerando assim, grandes volumes de lodos nas estações de tratamento de água (ETA), os quais em sua grande maioria contém alumínio, o que torna o seu reúso uma alternativa econômica e ambientalmente sustentável (DASSANAYAKE et al, 2015;SILVA et al 2016).…”

Section: Introductionunclassified

Pós-Tratamento De Efluente Sanitário Por Coagulação Com Íons De Alumínio Recuperados De Lodo De Eta

Oliveira

Silva

Cavallini

et al. 2017

R. gest. sust. ambient.

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RESUMOEste trabalho tem como objetivo avaliar a viabilidade da recuperação de íons de alumínio pela acidificação de lodo de ETA (LETA), para posterior aplicação como coagulante de esgoto sanitário. Foram realizados ensaios em escala laboratorial, avaliando as condições para regeneração, a eficiência do coagulante recuperado e o seu desempenho em relação ao sulfato de alumínio comercial. O coagulante regenerado apresentou resultados satisfatórios no tratamento do efluente da lagoa facultativa precedida por reator UASB, reduzindo: 43,2% de DBO, 59,8% de DQO, 94,6% de Fósforo total, 50,0% de Nitrato, 11,1% de Nitrogênio amoniacal, 27,1% de Sólidos Totais, 75,5% de Sólidos Suspensos Totais, 70,0% de Cor verdadeira e 70,4% de Turbidez, utilizando 32 mg/L de Al 3+ . Outra vantagem, é o fato do coagulante regenerado não reduzir drasticamente o pH do meio, mesmo sendo acidificado, permitindo sua aplicação sem o ajuste do pH do efluente para o processo de coagulação. Desta forma, esta proposta deve ser considerada como uma alternativa potencialmente viável, tanto para o aproveitamento do LETA, quanto para o pós-tratamento do efluente sanitário. Palavras-chave: Recuperação de íons Al 3+; sulfato de alumínio; lodo de ETA; coagulação; efluente sanitário.

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Treatment of paint manufacturing wastewater by coagulation/electrochemical methods: Proposals for disposal and/or reuse of treated water

Cited by 90 publications

References 38 publications

Investigation of Coagulation Activity of Cactus Powder in Water Treatment

Investigation of Coagulation Activity of Cactus Powder in Water Treatment

Biodiesel Wastewater Treatment by Coagulation-Flocculation: Evaluation and Optimization of Operational Parameters

Pós-Tratamento De Efluente Sanitário Por Coagulação Com Íons De Alumínio Recuperados De Lodo De Eta

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