Methanogenic toxicity in anaerobic digesters treating municipal wastewater |
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| Authors: | Ruiz I Blázquez R Soto M |
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| Institution: | 1. LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;2. Hovione FarmaCiencia SA, R&D, Sete Casas, 2674-506 Loures, Portugal;3. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Portugal;4. UCIBIO—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;1. Department of Physical Chemistry, V. N. Karazin National University, 61022, Kharkov, Ukraine;2. National University of Food Technologies, Volodymyrskaya, 68, Kiev, 01601, Ukraine;1. College of Agronomy, Northwest A&F University, Shaanxi, Yangling 712100, China;2. Research Center for Recycling Agriculture Engineering Technology of Shaanxi Province, Shaanxi, Yangling 712100, China;3. College of Forestry, Northwest A&F University, Shaanxi, Yangling 712100, China;1. Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, South Australia 5095, Australia;2. CRC CARE, PO Box 486, Salisbury, South Australia 5106, Australia;3. Mawson Institute and School of Advanced Manufacturing, University of South Australia, Mawson Lakes Campus, South Australia 5095, Australia;4. National Measurement Institute Australia, Bradfield Road, West Lindfield, New South Wales 2070, Australia;5. National Risk Management Research Laboratory, US Environmental Protection Agency, 5995 Centre Hill Avenue, Cincinnati, OH 45224, USA;1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Post Office Box 2871, Beijing 100085, China;2. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan |
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| Abstract: | In upflow anaerobic sludge blanket (UASB) digesters treating raw sewage at low temperatures, the sludge progressively lost methanogenic activity, indicating the possibility of methanogenic activity inhibition caused by wastewater constituents. To check this fact, batch and semi-continuous methanogenic toxicity assays were carried out with raw and centrifuged sewage. Permanent methanogenic toxicity on anaerobic sludge of approximately 50% was found when the sludge exposure to wastewater was renewed in a semi-continuous way. A stronger methanogenic inhibition of about 70-100% was observed when an active anaerobic sludge was exposed to mixed liquor from the UASB digester treating municipal wastewater. Suspended solids removal from sewage slightly reduced methanogenic toxicity. Effective concentration of municipal wastewater that caused a 50% reduction in methanogenic activity was estimated to be in the range of 150-200 mg CODl(-1). As methanogenic inhibition appeared to be related to remaining COD, higher methanogenic toxicity in digesters operating with low conversion efficiency will be expected. |
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