Continuous flow electrocoagulation in the treatment of wastewater from dairy industries

Benazzi, Toni Luis; Luccio, Marco Di; Dallago, Rogério Marcos; Steffens, Juliana; Mores, Rúbia; Nascimento, Mariele S. Do; Krebs, Jociane; Ceni, Giovana Cristina

doi:10.2166/wst.2015.620

Cited by 27 publications

(21 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…O observado reforça os indícios de que o mecanismo de remoção de DQO por tratamento eletrolítico ainda não é totalmente compreendido, principalmente quando se têm presentes espécies iônicas e compostos solúveis no efluente (CASSILAS et al, 2007). Relata-se também que efluentes com elevada concentração de compostos orgânicos dissolvidos, açúcares e carboidratos de alta solubilidade em água, como a ARC (CAMPOS et al, 2010), apresentam baixas eficiências de remoção de DQO por eletrofloculação (BENAZZI et al, 2016;CASSILAS et al, 2007).…”

Section: Resultado E Discussãounclassified

“…Essa tendência foi relatada por Tchamango et al (2010) no tratamento eletroquímico, em modo batelada, de um efluente sintético de leite e Chen et al (2000), no tratamento eletroquímico, em modo batelada, de efluentes de restaurante. Ambos os autores atribuíram esse comportamento, em relação a DQO, à presença de compostos orgânicos dissolvidos, os quais são de difícil remoção por processos que empregam a coagulação como forma de separação (BENAZZI et al, 2016;VALENTE et al, 2015;VALENTE et al, 2012).…”

Section: Resultado E Discussãounclassified

See 1 more Smart Citation

Avaliação Da Taxa De Remoção E Custo Do Tratamento Da Água Residuária Do Café Por Um Sistema Eletrolítico

Junior

Garcia²,

Reis³

2019

Rev. Agro. Amb.

View full text Add to dashboard Cite

RESUMO:A Água Residuária do Café (ARC) pode causar sérios impactos ambientais se for lançada no meio sem tratamento prévio. Assim, o tratamento eletrolítico surge como uma técnica bastante promissora nesse procedimento. Por esse motivo, objetivou-se nesse estudo avaliar a taxa de remoção dos poluentes e o custo do tratamento por essa técnica com base nas variáveis turbidez, sólidos totais e Demanda Química de Oxigênio (DQO) e no comportamento do pH e da condutividade elétrica. Utilizou-se uma célula eletrolítica com as dimensões internas de 8,15 de largura, 13,8 cm de comprimento e 8,9 cm de profundidade, possuindo um volume de 1000 cm 3 . Placas de alumínio com área de 0,02054 m² foram empregadas em uma configuração monopolar em paralelo. Realizaram-se ensaios em batelada variando a distância de placas, densidade de corrente e intervalos de coleta do efluente do reator entre 60 a 1440 segundos para a água residuária com e sem reúso, respectivamente. Por fim, constatou-se que os poluentes apresentam taxas e custos de remoção específicos, estando relacionados à corrente aplicada, distância de placas, eficiência de remoção, tempo de detenção hidráulico e concentração de outros componentes. PALAVRAS-CHAVE:Água Residuária do Café; Contaminação ambiental; Eletroflotação. ABSTRACT: Coffee Residue Water (CRW ) may cause serious environmental impacts if deposited in the environment without any treatment. Electrolithic treatment is a * 1020 Avaliação da taxa de remoção e custo do tratamento da água residuária do café... Rev. Agro. Amb., v. 12, n.3, p. 1019-1041, jul./set. 2019 -e-ISSN 2176-9168 highly promising technique for this procedure. Current analysis evaluates removal rate of pollutants and treatment costs of the technique, based on variables turbidity, total solids and Chemical Oxygen Demand (COD), coupled to pH and electric conductivity behavior. An electrolithic cell, measuring 8.15 width, 13.8 cm length and 8.9 cm depth, with a volume of 1000 cm 3 , was employed. Aluminum plates, 0.02054 m², were used for a parallel monopolar configuration. Batch assays were employed with variations in plate distance, current density and intervals in the effluent collection of the reactor between 60 and 1440 sec. for residue water, with and without reuse, respectively. Pollutants had specific removal rates and costs, related to applied current, plate distance, removal efficiency, hydraulic detention time and the concentration of other components.

show abstract

Section: Resultado E Discussãounclassified

Avaliação Da Taxa De Remoção E Custo Do Tratamento Da Água Residuária Do Café Por Um Sistema Eletrolítico

Junior

Garcia²,

Reis³

2019

Rev. Agro. Amb.

View full text Add to dashboard Cite

show abstract

“…Working range of independent variables (τ and t) were decided with the help of reported literature and preliminary experiments conducted (not shown here). Benazzi et al (2016) and Körbahti and Tanyolac (2009) studied HRT effects in continuous EC reactor in the range of 30-90 min and 30-240 min, respectively. Electrolysis time study in the range of 30-75 min is reported for batch reactor (Sharma, 2014;Yavuz et al, 2011).…”

Section: Statistical Methods and Analysismentioning

confidence: 99%

“…This discourages the treatment in batch EC reactor. However, only two studies (Benazzi et al, 2016;Un et al, 2014) are available in open literature for continuous EC treatment of dairy wastewater, reporting the influence of current density, retention time and pH on treatment efficiency. Benazzi et al (2016) used synthetic dairy wastewater (milk powder dissolved in distilled water) with Aluminium (Al) electrode, and Un et al (2014) studied whey wastewater (liquid discharged from cheese production) treatment with iron electrode.…”

Section: Introductionmentioning

confidence: 99%

“…(Demirel et al, 2005;Grasshoff, 1997;Passeggi et al, 2009). Moreover, steady state time (t S ), mass transfer coefficient (k m ) and kinetic parameters, which are important design parameters for the continuous reactors, and lacking in studies reported by Benazzi et al (2016) and Un et al (2014). Furthermore, energy consumption, which is an important operating cost parameter, is not reported in earlier studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dairy Wastewater Treatment in Continuous Stirred Tank Electrochemical Reactor (Cster): Parametric Optimization and Kinetics

Kushwaha

Kumari

Sangal

et al. 2019

Environ. Eng. Manag. J.

View full text Add to dashboard Cite

Dairy wastewater has been a major environmental concern because of massive effluents characterized by high pollution load. This study reports the influence of initial pH (pHi), residence time (τ) and elapsed time (t) on the %COD removal (Y1) and specific energy consumed (kWh per kg of COD removed, Y2) for real dairy industry wastewater treatment in continuous stirred tank electrochemical reactor (CSTER) using aluminum electrodes. Central composite design (CCD) was applied for designing the experiments, analyzing the experimental data and optimizing the process parameters to maximizing Y1 and simultaneously minimizing Y2. Important design parameters for continuous reactors like steady state time (tS), mass transfer coefficient (km) and kinetic parameters were also estimated. Modified pseudo-first-order kinetic model was used for kinetic modeling with non-linear regression technique. Experiments conducted at optimal process parameters for CSTER (pHi= 4.5, τ= 141 min; t= 52 min) showed Y1 = 71.21%, Y2 = 4.

show abstract

Techno‐economical optimization using Box–Behnken (BB) design for chemical oxygen demand and chloride reduction from hospital wastewater by electro‐coagulation

Bajpai

Katoch

2020

Water Environment Research

View full text Add to dashboard Cite

The study examines the optimum condition of an electro-coagulation (EC) unit for treatment of hospital wastewater (HWW) using iron (Fe) electrodes. The impact of factors such as pH, current, and electrolysis time on COD, chloride, and anode dissolution was investigated. For this purpose, Box-Behnken (BB) design based on the response surface methodology (RSM) was used to design and analyze the results. The predicted value of chemical oxygen demand (COD) and chloride removal at optimum conditions (pH: 7.41, current: 2.64 A and electrolysis time: 41.31 min) were 92.81% and 71.23%, respectively. At same optimum conditions, the value of energy and electrode consumption per kg of COD was 0.06376 kWh/ kg COD and 1.362 kg/kg COD, respectively. High value of R 2 (i.e., R 2 > 99%) for all three responses (Y 1 , Y 2 , and Y 3) obtained from ANOVA confirms that the proposed model is valid, accurate, and acceptable. The kinetic study shows linear relationship and follows pseudo-first-order kinetics. Pareto graph shows that the percentage impact of current factor on COD and chloride removal was maximum, that is, 54.984% and 66.79%, respectively. Lastly, the total cost of EC treatment was calculated in terms of COD removal and was found to be 55.47 ₹/kg COD. © 2020 Water Environment Federation • Practitioner points • Using Fe electrode results in 92.81% COD and 71.23% Chloride removal, respectively. • High value of R 2 > 99% for all three responses from ANOVA confirms the proposed model is valid. • Pareto analysis shows current factor has maximum percentage impact on pollutant removal. • Kinetic study shows linear relationship and follows pseudo-first-order kinetics.

show abstract

Continuous flow electrocoagulation in the treatment of wastewater from dairy industries

Cited by 27 publications

References 26 publications

Avaliação Da Taxa De Remoção E Custo Do Tratamento Da Água Residuária Do Café Por Um Sistema Eletrolítico

Avaliação Da Taxa De Remoção E Custo Do Tratamento Da Água Residuária Do Café Por Um Sistema Eletrolítico

Dairy Wastewater Treatment in Continuous Stirred Tank Electrochemical Reactor (Cster): Parametric Optimization and Kinetics

Techno‐economical optimization using Box–Behnken (BB) design for chemical oxygen demand and chloride reduction from hospital wastewater by electro‐coagulation

Contact Info

Product

Resources

About