Helminth eggs inactivation efficiency by faecal sludge dewatering and co-composting in tropical climates

Koné, Daouda; Cofie, Olufunke O.; Zurbrügg, Christian; Gallizzi, Katharina; Moser, Daya; Drescher, Silke; Strauss, M.

doi:10.1016/j.watres.2007.06.024

Cited by 123 publications

(100 citation statements)

References 15 publications

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“…Several authors (Gaspard and Schwartzbrod 2003;Cofie et al 2006;Koné et al 2007;El Fels et al 2014b) showed that the rise of temperature during the thermopilic stage leads to hygeinization. Furthermore, Redlinger et al (2001); Pietronave et al (2004) and Bhatia et al (2013) noted that a significant decrease of faecal coliforms and faecal Streptococci during composting.…”

Section: Coliforms Versus Time Of Co-composting Processmentioning

confidence: 99%

Use of the co-composting time extract agar to evaluate the microbial community changes during the co-composting of activated sludge and date palm waste

Fels

Ouhdouch

Hafidi

2015

Int J Recycl Org Waste Agricult

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Section: Coliforms Versus Time Of Co-composting Processmentioning

confidence: 99%

Use of the co-composting time extract agar to evaluate the microbial community changes during the co-composting of activated sludge and date palm waste

Fels

Ouhdouch

Hafidi

2015

Int J Recycl Org Waste Agricult

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“…Technologies to inactivate helminth eggs in sludge are aimed at destroying the structure of the egg (mainly damages in its lipid layer) which prevents further development and survival of the eggs [4,19,20]. The best technologies for inactivation of helminth eggs present in sludge are thermal treatment at 108 °C [16], irradiation at 3500 Gy [14,15], pasteurization at 70 °C [13,21] or chemical treatment using sulfuric, hydrochloric, propionic, acetic or peracetic acid [19].…”

Section: Introductionmentioning

confidence: 99%

Helminth Egg Removal Capacity of UASB Reactors under Subtropical Conditions

Yaya-Beas

Ayala-Limaylla

Kujawa-Roeleveld

et al. 2015

Water

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This research was conducted to study the anaerobic sludge filtration capacity regarding helminth egg removal in upflow anaerobic sludge blanket (UASB) reactors. Two 25 L lab-scale UASB reactors were operated at an ambient temperature which varied between 17.1 and 28.6 °C. Ascaris suum egg was selected as the model egg considering its similarity in terms of size and morphology to Ascaris lumbricoides, a human pathogen. Ascaris suum eggs were obtained from female parasites of infected pigs. The anaerobic sludge filtration capacity was performed applying upflow velocities between 0.09 and 0.68 m·h −1. Three sludge bed heights in the range of 0.30-0.40 m, 0.50-0.60 m and 0.60-0.70 m were applied. These sludge bed heights corresponded to 19%-25%, 31%-38% and 38%-44% of the total reactor height, respectively. Under the mentioned conditions, the average helminth egg removal efficiency was reciprocally correlated to the imposed upflow velocity. The studied lab-scale reactors reported an average helminth egg removal between 34%-100%, 30%-91% and 34%-56%, when the sludge bed in the UASB reactor OPEN ACCESSWater 2015, 7 2403 was 19%-25%, 31%-38% and 38%-44% of the total reactor height, respectively. The decreased filtration capacity at increasing sludge bed heights might be likely related to biogas production and channeling formation. The average helminth egg removal efficiency in the control experiments performed without any sludge bed, by plain sedimentation, varied between 44% and 66%.

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“…Silva et al (2008) consideraram o pH e as interações interespecíficas durante o processo de compostagem com lodo como fatores adicionais, além da temperatura, para a eliminação total de ovos de helmintos durante o experimento. Por outro lado, Koné et al (2007) não obtiveram sucesso na eliminação total de ovos de helmintos de compostagem com lodo de origem fecal detectando, ao final do processo, valores abaixo de 1 ovo g -1 de composto.…”

Section: Resultsunclassified

“…têm as mais altas taxas de resistência e sobrevivência dentro das condições de tratamento de efluentes (Koné et al, 2007). A concentração residual de ovos de helmintos no lodo é relacionada à prevalência e intensidade entre índices de infecção e perfil da população local onde o lodo de esgoto é coletado, bem como de outros vários fatores que influenciam na sobrevivência do parasita.…”

Section: Introductionunclassified

Temperatura de degradação de resíduos em processo de compostagem e qualidade microbiológica do composto final

Silva

Marco

Hahn

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOA técnica da compostagem é um recurso empregado com o objetivo de reciclar resíduos orgânicos domésticos e sanitizar o lodo produzido nas estações de tratamento de efluentes de esgoto (ETE) podendose obter um composto com propriedades de fertilizante agrícola e/ou corretor de solos degradados. A alta temperatura atingida pelo sistema deve ser responsável pela redução de micro-organismos patogênicos presentes no início do processo assegurando, desta forma, a qualidade microbiológica do composto sem oferecer riscos de contaminação, conforme preconiza a Resolução 354/2006 do CONAMA. Objetivouse, com o trabalho, avaliar a influência da temperatura sobre a redução de Escherichia coli, Salmonella sp., ovos de helmintos e vírus entéricos durante o processo de compostagem, além da contagem de bactérias heterotróficas. Foram realizados testes colimétricos, semeaduras em meios de cultivo, testes de visualização de ovos de helmintos e detecção molecular de vírus entéricos. Os resultados indicaram oscilação nas contagens de E. coli e de bactérias heterotróficas, mesmo após a fase termofílica. Por outro lado, não foi detectada a presença de Salmonella sp., vírus entéricos nem de ovos viáveis de helmintos, ao final do processo. Palavras-chave: lodo de esgoto, coliformes, matéria orgânicaEvaluation of degradation temperature of compounds in a composting process and microbiological quality of the compost ABSTRACT The composting technique is a promising alternative for the treatment of solid organic residues, along with the sludge produced in sewage treatment plants. The final compost might show fertilizer properties, which can be used to recover poor soils. The high temperatures that the composting process can achieve are responsible for the reduction of the pathogenic microbial population, helminth eggs and virus present in the beginning of the process. This behavior assures the microbial quality of the compost according to the 375/2006 Resolution of the CONAMA. The aim of this study was to evaluate the influence of temperature on Escherichia coli, Salmonella sp., helminth egg and enteric virus presence in the final product from a composting process. For this matter colimetric assays were performed together with the seedling of the samples in different culture media, the assay for helminth eggs visualization under the microscope and the identification of enteric virus. The results showed an oscillation on E. coli and heterotrophic bacteria counts, even after the thermophilic phase. On the other hand, Salmonella sp., helminth eggs and enteric virus were not found in the final compost.

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Helminth eggs inactivation efficiency by faecal sludge dewatering and co-composting in tropical climates

Cited by 123 publications

References 15 publications

Use of the co-composting time extract agar to evaluate the microbial community changes during the co-composting of activated sludge and date palm waste

Use of the co-composting time extract agar to evaluate the microbial community changes during the co-composting of activated sludge and date palm waste

Helminth Egg Removal Capacity of UASB Reactors under Subtropical Conditions

Temperatura de degradação de resíduos em processo de compostagem e qualidade microbiológica do composto final

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