Estudo da variação da concentração de metano no biogás produzido a partir das águas residuárias do café

Prado, Marco Antônio Calil; Campos, Cláudio Milton Montenegro; Silva, Júlia Ferreira da

doi:10.1590/s1413-70542010000200029

Cited by 8 publications

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“…For the treatment of such wastewaters, the upflow anaerobic sludge blanket (UASB) can be efficient in removing higher organic loading, solids and toxic organic compounds, and in the production of methane for use in the coffee drying as was observed by SILVA & CAMPOS (2005), BRUNO & OLIVEIRA (2008), PRADO & CAMPOS (2008), PRADO et al (2010), SELVAMURUGAN et al (2010a and b). However, in the treated effluent, some control parameters still do not meet the thresholds set out in Resolutions 357 and 430 of the Brazilian National Environment Council -CONAMA (BRAZIL, 2005 and for the release into water bodies, requiring improved treatment system.…”

Section: Introductionmentioning

confidence: 99%

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee

Bruno

Oliveira

2013

Eng. Agríc.

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ABSTRACT:In this study it was evaluated the efficiency of the treatment of wet-processed coffee wastewater in upflow anaerobic sludge blanket (UASB) reactors in two stages, in bench scale, followed by post-treatment with activated sludge in batch. The first UASB reactor was submitted to an hydraulic retention time (HRT) of 6.2 d and organic loading rates (OLR) of 2.3 and 4.5g CODtotal (L d) -1 , and the second UASB reactor to HRT of 3.1 d with OLR of 0.4 and 1.4gThe average values of the affluent CODtotal increased from 13,891 to 27,926mg L -1 and the average efficiencies of removal of the CODtotal decreased from 95 to 91%, respectively, in the UASB reactors in two stages. The volumetric methane production increased from 0.274 to 0.323L CH 4 (L reactor d) -1 with increment in the OLR. The average concentrations of total phenols in the affluent were of 48 and 163mg L -1 , and the removal efficiencies in the UASB reactors in two stages of 92 and 90%, respectively, and increased to 97% with post-treatment. The average values of the removal efficiencies of total nitrogen and phosphorus were of 57 to 80% and 44 to 60%, respectively, in the UASB reactors in two stages and increased to 91 and 84% with the posttreatment.KEYWORDS: anaerobic digestion, methane, nitrogen, phosphorus, phenols. -1 , e as eficiências médias de remoção nos reatores UASB em dois estágios, de 92 e 90%, respectivamente, e aumentaram para 97% com o pós-tratamento. As eficiências médias de remoção de nitrogênio e fósforo total variaram, respectivamente, de 57 a 80% e de 44 a 60% nos reatores UASB em dois estágios e aumentaram para 91 e 84% com a inclusão do pós-tratamento. PALAVRAS-CHAVE: digestão anaeróbia, fenóis, fósforo, metano, nitrogênio. DESEMPENHO DE REATORES UASB EM DOIS ESTÁGIOS SEGUIDOS DE PÓS-TRATAMENTO COM LODOS ATIVADOS EM BATELADA DE ÁGUAS RESIDUÁRIAS DO BENEFICIAMENTO DE CAFÉ POR

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Section: Introductionmentioning

confidence: 99%

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee

Bruno

Oliveira

2013

Eng. Agríc.

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“…After this period, the methane production returned to the previous stable values, such that the mean for 130 days of operation was 1.459L CH4 (L reactor d) -1 with low coefficient of variation of 20% (Table 4). From the results presented by PRADO & CAMPOS (2008) and PRADO et al (2010) . Methane volumetric production during the start-up of the horizontal anaerobic reactors with sludge blanket (R1) and fixed bed (R2 and R3), and of the treatment system (R1+R2+R3).…”

Section: Resultsmentioning

confidence: 99%

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

Oliveira

Bruno

2013

Eng. Agríc.

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ABSTRACT:In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3), installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal) of 16,003 mg L -1 . The hydraulic retention time (HRT) in each reactor was 30 h. The volumetric organic loading (VOL) applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d) -1 . The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3), stabilizing above 80% after 30 days of operation. The mean content of methane in the biogas were of 70 to 76%, the mean volumetric production was 1.7 L CH 4 (L reactor d) -1 in the system, and the higher conversions were around at 0.20 L CH 4 (g COD removed )-1 in R1 and R2. The mean values of pH in the effluents ranged from 6.8 to 8.3 and the mean values of total volatile acids remained below 200 mg L -1 in the effluent of R3. The concentrations of total phenols of the affluent ranged from 45 to 278 mg L -1 , and the mean removal efficiency was of 52%. The start-up of the anaerobic treatment system occurred after 30 days of operation as a result of inoculation with anaerobic sludge with active microbiota.KEYWORDS: volumetric organic loading, bamboo, methane, phenols, reactors in series. PARTIDA DE REATORES ANAERÓBIOS HORIZONTAIS COM MANTA DE LODO E DE LEITO FIXO PARA TRATAMENTO DE ÁGUAS RESIDUÁRIAS DO BENEFICIAMENTO DE FRUTOS DO CAFEEIRO POR

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“…As águas residuárias originadas do processamento do café (ARC) podem ser tratadas por processos de digestão anaeróbia, cada vez mais utilizados, servindo-se da alta eficiência na remoção de matéria orgânica e de macronutrientes, como o nitrogênio e o fósforo e, ainda, pelo seu baixo custo. Esse sistema produz baixa quantidade de lodo e, ainda, energia, com a produção de biogás, composto, principalmente, por metano e dióxido de carbono (Silva et al, 2010).…”

Section: Introductionunclassified

“…O TAE, como unidade antecessora ao tratamento, se mostrou essencial ao bom desempenho do sistema. Prado et al (2010), dando continuidade ao trabalho anterior, utilizou um sistema em escala laboratorial para o tratamento das ARC, tendo observado, também, que a utilização de uma unidade anterior à unidade anaeróbia, era capaz de equalizar as vazões e permitir a acidificação do afluente, proporcionando uma operação com faixas de vazão e cargas mais uniformes. Observou, ainda, que a diminuição da eficiência na remoção da DQO e DBO 5 na referida unidade, se relacionava ao aumento na concentração no efluente da unidade anaeróbia.…”

Section: Introductionunclassified

Capacidade da lagoa de estabilização, integrante de um sistema piloto, na remoção da carga orgânica da água residuária do processamento do café por via úmida

Silva

Campos

2010

Ciênc. agrotec.

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RESUMOO processamento do café por via úmida, além de aumentar a eficiência para se obter cafés de melhor qualidade, diminui consideravelmente os custos de secagem e ainda, reduz o espaço ocupado no terreiro. Porém, esse tipo de processamento gera grandes quantidades de águas residuárias, que devem sofrer algum tipo de tratamento antes de serem lançadas em corpos hídricos. Nesta pesquisa, objetivou-se monitorar a Lagoa de Estabilização integrante desse sistema, avaliar a sua eficiência na remoção da carga orgânica afluente e desenvolver um modelo de ajuste para descrever a autodepuração ocorrida. Para esta pesquisa, foram considerados 300,200 litros de frutos do cafeeiro, da espécie Coffea arabica L., processados, por via úmida. A carga média diária foi de 136 kgDQO d -1 , encaminhada para um sistema piloto de tratamento de água residuária do processamento do café. O monitoramento foi realizado por meio de análises químicas e físico-químicas e o modelo de ajuste foi desenvolvido a partir do cálculo do balanço hídrico, das equações de estimativa teórica de remoção de DQO e das análises de DQO realizadas. O efluente da lagoa de estabilização apresentou concentração inicial de DQO de 7,100 mg L -1 e final de 100 mg L -1 . Ficou constatado que a lagoa foi a unidade de tratamento que reduziu em cerca de 80% a concentração de matéria orgânica afluente. O modelo de ajuste desenvolvido apresentou coeficiente de ajuste satisfatório (r 2 = 0,8015). Termos para indexação:Modelo matemático, tratamento de efluente, pós-colheita do café, lagoa de estabilização. ABSTRACTWet coffee processing, besides its efficiency in getting better coffee quality, also minimizes considerably drying costs, and moreover reduces the space due to the ground-flour spreading seeds. However, this type of processing produces large quantities of wastewater, which must be treated before being discharged into the sewage system. The main objective of this research was to monitor the stabilization pond, as part of a pilot system, and therefore, to evaluate its efficiency concerning the organic loading removal and also to develop a model that can describe the auto-purification. In this research it was used 300.200 liters of coffee fruits, Coffea arabica L., specie, in the wet processing. The organic loading rate applied was 136 kgCOD d -1 .The performance of this unit was monitored through chemical and physical-chemical analysis, and the mathematical modeling was developed based on the hydric balance, on the theoretical COD estimation and on the actual analysis of COD realized. The stabilization pond effluent presented averages of initial and final COD concentration of 7.100 mg L -1 and 100 mg L -1 , respectively. It was found that the stabilization pond was responsible for removing 80% of the total organic matter present in the affluent. The adjusted model developed showed a satisfactory regression coefficient (r 2 = 0,8015). Index terms: INTRODUÇÃOA obtenção de cafés de boa qualidade está diretamente vinculada aos processos de pós-colheita, capacitando a...

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Estudo da variação da concentração de metano no biogás produzido a partir das águas residuárias do café

Cited by 8 publications

References 8 publications

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee

Performance of UASB reactors in two stages followed by post-treatment with activated sludge in wastewater batch of wet-processed coffee

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

Capacidade da lagoa de estabilização, integrante de um sistema piloto, na remoção da carga orgânica da água residuária do processamento do café por via úmida

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