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TitleWater reuse: dairy effluent treated by a hybrid anaerobic biofilm baffled reactor and its application in lettuce irrigation
Author(s)Santos, K. A.
Gomes, T. M.
Rossi, F.
Kushida, M. M.
Del Bianchi, V. L.
Ribeiro, R.
Alves, M. M.
Tommaso, G.
Keywordsagro-industrial effluent
anaerobic digestion
hybrid anaerobic biofilm baffled reactor
Lactuca sativa
Issue date2021
PublisherInternational Water Association Publishing
JournalWater Science and Technology: Water Supply
CitationSantos, K. A.; Gomes, T. M.; Rossi, F.; Kushida, M. M.; Del Bianchi, V. L.; Ribeiro, R.; Alves, M. Madalena; Tommaso, G., Water reuse: dairy effluent treated by a hybrid anaerobic biofilm baffled reactor and its application in lettuce irrigation. Water Science and Technology-Water Supply, 21(5), 1980-1993, 2021
Abstract(s)There is a synergy between the large quantities of organics-rich effluents generated by the dairy industry and the continually increasing water needs for crop irrigation. In this sense, this study aimed at evaluating the effect of decreasing the hydraulic retention time (HRT) on the stability and efficiency of a hybrid anaerobic biofilm baffled reactor (HABBR) treating simulated fat- and salt-rich dairy wastewater, followed by its agricultural reuse. The reactor was monitored over 328 days, during which 72, 24, and 12 hours were the hydraulic detention times. After achieving steady-state, the reactor presented organic matter removal above 90% and produced biogas with 41 ± 23%, 53 ± 3%, and 64 ± 12% of methane for HRTs of 72, 24, and 12 hours, respectively. The best process performance was observed for an HRT of 24 h, and thus, a lettuce culture was irrigated with the treated effluent. The irrigation was performed in five different treatments, for which the amount of treated effluent added to tap water varied from 0 to 100%. Both the effluent and the harvested vegetables were evaluated for microbial contamination. Apart from the 75% effluent supply condition, there were no losses in leaf mass or area observed, and instead, there was an increase of these parameters for the 25 and 50% effluent supply treatment. The use of dairy effluent treated by the HABBR allowed for microbiologically safe food production. Therefore, the process offered both potential cost reduction for fertilizers, preservation of water resources, and a renewable energy source.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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