Optimization of Anaerobic Treatment of Cassava Processing Wastewater

Fleck, Leandro; Tavares, Maria Hermínia Ferreira; Eyng, Eduardo; Andrade, Minéia Aparecida de Moraes De; Frare, Laércio Mantovani

doi:10.1590/1809-4430-eng.agric.v37n3p574-590/2017

Cited by 19 publications

(16 citation statements)

References 38 publications

(46 reference statements)

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“…Normally, the digester gas is saturated with water vapor. Therefore, the water vapour pressure was calculated according to the modified Buck equation (equation 5) [45,47].…”

mentioning

confidence: 99%

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Twizerimana

M’Arimi

Bura

et al. 2020

JENRR

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Aim: To investigate the feasibility of producing biogas from anaerobic co-digestion of cotton yarn wastes (CY) and human urine (HU) using fresh cow dung as the inoculum. Study Design: Anaerobic co-digestion of CY waste and HU and CY waste alone were done using batch reactors. Place and Duration of Study: CY were collected from Rivatex Eastern Africa Limited, Eldoret, Kenya while fresh cow manure used as inoculum was collected from a farm at Moi University, Eldoret, Kenya. Human urine sample was collected in a clean sterile container at Moi University hostel, Eldoret, Kenya. The experimental set up and analyses were performed at Chemical and Process Engineering Laboratory, Moi University, Kenya between January 2020 and May 2020. Methodology: CY, HU and fresh cow dung were subjected to physicochemical analysis. Batch anaerobic co-digestion of CY and HU, and CY alone were carried out under ambient temperature (25 ± 3 ) conditions for 95 days and 37 days, respectively. Results: The CY contained 90.46% total solids, 77.12% volatile solids and 9.54% moisture content while the corresponding values for HU were 2.9%, 58.5% and 97.1%, respectively. CY had a high carbon to nitrogen ratio. The biogas yield from anaerobic co-digestion was 35.6% more than digestion of CY alone. The highest daily biogas production for co-digestion and digestion of CY alone were 330 mL and 386 mL on day 12 and 21, respectively. The total biogas yield when CY co-digested for 95 days was 10,125 mL which decreased to 6,519 mL without co-digestion after 37 days. Conclusion: Our results showed that co-digestion produced more biogas than digestion of CY alone. Conclusively, the presence of HU during anaerobic digestion of CY enhanced the biogas production by more than 35.6% demonstrating that HU could be an effective waste for co-digestion of solid wastes such as CY. Further research should focus on monitoring parameters like temperature, buffering capacity and fatty acid levels to ensure optimal efficiency and maximum biogas yield.

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“…Normally, the digester gas is saturated with water vapor. Therefore, the water vapour pressure was calculated according to the modified Buck equation (equation 5) [45,47].…”

mentioning

confidence: 99%

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Twizerimana

M’Arimi

Bura

et al. 2020

JENRR

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“…This value was reported for the cassava industry in Thailand. However, in South America, reported COD contents are lower; for example, the COD content of wastewater from the cassava industry in Brazil was 6014 mg/L [45]. In any case, such contents of organic matter are too high to be directly tested with fish.…”

Section: Free-choice Non-forced Exposure Systemmentioning

confidence: 99%

Assessment of Advanced Oxidation Processes Using Zebrafish in a Non-Forced Exposure System: A Proof of Concept

et al. 2021

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Water bodies and aquatic ecosystems are threatened by discharges of industrial waters. Ecotoxicological effects of components occurring in untreated and treated wastewaters are often not considered. The use of a linear, multi-compartmented, non-forced, static system constructed with PET bottles is proposed for the quality assessment of treated waters, to deal with such limitations. Two synthetic waters, one simulating wastewater from the textile industry and the other one simulating wastewater from the cassava starch industry, were prepared and treated by homogeneous Fenton process and heterogeneous photocatalysis, respectively. Untreated and treated synthetic waters and their dilutions were placed into compartments of the non-forced exposure system, in which zebrafish (Danio rerio), the indicator organism, could select the environment of its preference. Basic physical–chemical and chemical parameters of untreated and treated synthetic waters were measured. The preference and avoidance responses allowed verification of whether or not the quality of the water was improved due to the treatment. The results of these assays can be a complement to conventional parameters of water quality.

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“…negativo, ou seja, quanto menor for a temperatura para operação do biodigestor, maior produção de biogás ocorrerá. Este é um dado curioso, uma vez que estudos têm reportado temperaturas iguais ou superiores a 30°C, como ideais no processo de biodigestão anaeróbia para produção de biogás (MUVHIIWA et al, 2016;FLECK et al, 2017).…”

Section: Valores Codificadosunclassified

Co-Digestão Anaeróbia De Manipueira, Casca De Café E Esterco Bovino: Um Estudo De Otimização Do Processo De Metanização / Anaerobic Co-Digestion of Manure, Coffee Husk and Bovine Manure: A Study to Optimize the Methanization Process

Leite

Santos

Lima

et al. 2021

BJD

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RESUMOO interesse pela produção de biogás tem se intensificado principalmente pelo aumento da demanda energética, além da crescente preocupação com as questões ambientais. Propôsse neste trabalho avaliar a potencialidade da co-digestão anaeróbia de manipueira, casca de café e esterco bovino para a produção de biogás, a fim de otimizar as condições de operação do biodigestor, em um tempo de retenção hidráulica de 15 dias. Foram conduzidas três etapas experimentais aplicando o delineamento composto central rotacional (DCCR) para avaliar o efeito das variáveis e da interação entre elas (níveis de carga orgânica volumétrica, temperatura, pH, adição/concentração celular de bactérias celulolíticas e adição de micronutrientes) sobre o processo de metanização. Os resultados demonstraram que as condições ideais para metanização foram definidas como: 40mL de manipueira; 95mL de casca de café; 40mL de esterco bovino; pH 6; adição de 1,5.106UFC.mL-1 de inóculo bacteriano, temperatura de 30°C; adição de 46,97 e 4,41mg.L-1 de FeSO4.7H2O e MnSO4.H2O, respectivamente.

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Optimization of Anaerobic Treatment of Cassava Processing Wastewater

Cited by 19 publications

References 38 publications

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Biogas Production from Co-digestion of Cotton Yarn Waste and Human Urine

Assessment of Advanced Oxidation Processes Using Zebrafish in a Non-Forced Exposure System: A Proof of Concept

Co-Digestão Anaeróbia De Manipueira, Casca De Café E Esterco Bovino: Um Estudo De Otimização Do Processo De Metanização / Anaerobic Co-Digestion of Manure, Coffee Husk and Bovine Manure: A Study to Optimize the Methanization Process

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