NDLI: Anaerobic treatment of Tequila vinasses in a CSTR-type digester

Content Provider	Springer Nature Link
Author	Méndez Acosta, Hugo Oscar Snell Castro, Raúl Alcaraz González, Víctor González Álvarez, Víctor Pelayo Ortiz, Carlos
Copyright Year	2009
Abstract	Tequila industries in general produce great volumes of effluents with high pollutant loads, which are discharged (untreated or partially treated) into natural receivers, thus causing severe environmental problems. In this contribution, we propose an integrated system as a first step to comply with the Mexican ecological norms and stabilize the anaerobic treatment of Tequila vinasses with main design criteria: simple and easy operation, reduce operating time and associated costs (maintenance), integrated and compact design, minimal cost of set-up, start-up, monitoring and control. This system is composed of a fully instrumented and automated lab-scale CSTR-type digester, on-line measuring devices of key variables (pH, temperature, flow rates, etc.), which are used along with off-line readings of chemical oxygen demand (COD), biogas composition, alkalinity and volatile fatty acids to guarantee the operational stability of the anaerobic digestion process. The system performance was evaluated for 200 days and the experimental results show that even under the influence of load disturbances, it is possible to reduce the COD concentration to 85% in the start-up phase and up to 95% during the normal operation phase while producing a biogas with a methane composition greater than 65%. It is also shown that in order to maintain an efficient treatment, the buffering capacity (given by the alkalinity ratio, α = intermediate alkalinity/total alkalinity) must be closely monitored.
Starting Page	357
Ending Page	363
Page Count	7
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	21
Issue Number	3
e-ISSN	15729729
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-11-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wastewater treatment Anaerobic digestion CSTR reactor Tequila industry Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Terrestrial Pollution Geochemistry Soil Science & Conservation Microbiology
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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