Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method

This manuscript addresses the evaluation of the methane production and removal of organic matter and phenols from coffee fruits processing wastewater (CPW). The systems consisted of two serial upflow anaerobic sludge blankets (UASB1 and UASB2) and one sequential batch reactor (SBR). The organic loading rate (OLR) was increased from 3 to 6 g COD/L.d, and the hydraulic retention times (HRT) applied to UASB1, UASB2 and SBR were 60, 30 and 75 h, respectively. Similar OLRs were tested with raw CPW (tests 1 and 2) and CPW after the addition of Simple Super Phosphate (SSP) (tests 3 and 4). The COD removals in the two stages UASB ? SBR were approximately 85 % in tests 1 and 3 and 88 % in tests 2 and 4. The total phenols (TF) removal ranged between 70 and 92 %. The highest bioenergy productivities were achieved in UASB1, i.e., approximately 0.33 and 0.70 L CH 4 /L.d with OLR of approximately 3 and 6 g COD/L.d. Although, the addition of SSP did not induce a superior methane production or TF removal, it promoted enabled a faster biomass growth after acidification time. SBR was tested with two cycles-cycle 1 with anaerobic ? aerobic reactions (tests 1 and 2) and cycle 2 with anaerobic ? aerobic ? anaerobic reactions and lower sedimentation time (tests 3 and 4). Cycle 2 obtained higher COD and TF removal. The addition of SSP enhanced the SBR performance and increased between 13 and 24 % the TF removal.

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“…The biogas was collected and measured daily by gasometers constructed of fiberglass as described by Oliveira (1997) (Fig. 1).…”

Section: Biogasmentioning

confidence: 99%

Removal of phenols and methane production with coffee processing wastewater supplemented with phosphorous

Montoya

Ferro

Oliveira

2016

Int. J. Environ. Sci. Technol.

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“…The growing demand and cost of energy in recent years changed this scenario, and there has been a considerable attention paid to improving fermenters for biogas production, especially highrate reactors, such as fixed-bed reactors, for the treatment of organic effluents (Oliveira & Bruno, 2013). The upflow anaerobic filter with low HRT is a compact treatment unit, and has been Effect of organic load and alkalinity on dairy wastewater biomethanation Eng.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Load and Alkalinity on Dairy Wastewater Biomethanation

et al. 2017

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This study aimed to evaluate the effect of variations in organic load (hydraulic retention times -HRTs: from 2 to 0.5 day) and in alkalinity (NaHCO3 from 4,000 to 1,000 mg.L -1 ) on methane production. Biomass of sewage sludge was inoculated and stabilized on 1" polypropylene rings. The rings were immersed in the liquid phase (8.41 L) of an upflow anaerobic filter reactor (12.22 L). A solution of 5 g of whole milk powder per liter was used to simulate effluent from the dairy industry. Process effectiveness was measured by chemical oxygen demand reduction, biogas production, and biogas methane content. Biogas production started at a 2-day HRT and synthetic effluent alkalinization with 4,000 mg.L -1 NaHCO3. The best operation condition was at 1-day HRT and with the addition of 4,000 mg.L -1 NaHCO3. Biogas production reached 1.5 NL of biogas per L of reactor liquid phase, with 68% of methane and a concomitant reduction in COD of 57%.

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“…Visando agregar valor ao produto, após a colheita os grãos são descascados e desmucilados via úmida, gerando a Água Residuária do Café (ARC) (SILVA et al, 2014). Esse efluente apresenta alto teor de matéria orgânica, expressa em Demanda Bioquímica de Oxigênio (DBO 5,20 ºC) e Demanda Química de Oxigênio (DQO), é rica também em açúcares, proteínas, amido, pectina, compostos fenólicos, nitrogênio total, fósforo total, sódio (CAMPOS et al, 2010) e, principalmente, potássio que, se lançada sem tratamento em corpos hídricos, pode causar diversos impactos ambientais (FIA et al, 2010d;2010e;BRUNO, 2013).…”

Section: Introductionunclassified

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.

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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.

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Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method

Cited by 10 publications

References 16 publications

Removal of phenols and methane production with coffee processing wastewater supplemented with phosphorous

Removal of phenols and methane production with coffee processing wastewater supplemented with phosphorous

Effect of Organic Load and Alkalinity on Dairy Wastewater Biomethanation

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

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