Cofermentation of spent sugar beet pulp and wastewater
2013
Hutnan, M., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic) | Toth, S., Slovenske cukrovary, s.r.o., Sered (Slovak Republic) | Bodik, I., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic) | Kolesarova, N., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic) | Lazor, M., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic) | Lehotska, S., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic) | Drtil, M., Ustav chemickeho a environmentalneho inzinierstva, Bratislava (Slovak Republic)
In factual literature it is possible to find information about anaerobic treatment of spent sugar beet pulp in a mono-digestion systems or co-digested with other substrates. For some sugar beet factories with free capacity of the anaerobic reactor on the anaerobic-aerobic wastewater treatment plant (WWTP), cofermentation of spent sugar beet pulp and wastewater may be an interesting option. This possibility was studied in this work, which presents the results of the operation of a pilot plant with anaerobic reactor with the volume of 3.5 square m. Sugar beet pulp and wastewater, which were produced during the campaign in the sugar beet factory, were processed in this reactor. The results of the pilot plant operation showed that cofermentation of these materials is possible and that the content of ammonia nitrogen in the anaerobic reactor sludge water can even be lower. However, nitrogen content in sludge water depends on the C:N ratio of the processed sugar beet pulp. The recommended organic loading rate of an anaerobic reactor is 6 kg/square m/d (COD) and during normal operation of the sugar beet factory more than half of this load is supplied by the sugar beet pulp. Cofermentation of wastewater and spent sugar beet pulp in an anaerobic reactor of sugar beet factory WWTP is expected to result in 1.5- to 2-fold production of biogas compared to the treatment of only wastewater.
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