Journal of Food, Agriculture and Environment
Vol 11,
Issue 1,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Influence of hydraulic retention time on the anaerobic treatment of cassava starch extraction effluent using a one-phase horizontal reactor
Author(s):
Osvaldo Kuczman,
Maria Hermínia Ferreira Tavares *, Simone Damasceno Gomes, Douglas Guedes Batista Torres, Leandro FleckRecieved Date: 2012-10-08, Accepted Date: 2013-01-20
Abstract:The large concentration of cassava starch industries in the State of Parana, Brazil, brings environmental problems due to the residues generated, since the organic load can be as large as 15,700 mg L-1 COD (chemical oxygen demand), with a pH of 4.4. At least 0.60 m3 of wastewater is formed in the processing of 1 ton of cassava or 2.40 m3 of wastewater for each ton of cassava starch processed. There are few reports on cassava starch wastewater treatments using one-phase horizontal reactors, although there are several studies concerning two-phase reactors. To give more information about the theme, the aim of the study was to evaluate the influence of hydraulic retention time (HRT) on the treatment of wastewater from cassava starch extraction industries with a one-phase horizontal anaerobic continuous-flow reactor at laboratory scale. The effects of HRT on the removal of volatile solids and organic charges and biogas production are highlighted. A reactor with a volume of 16.20 L was used; it was kept at 33 ± 1ºC and the HRTs were 13.0, 8.3 and 6.6 days. The mean removal values were 99.5, 98.9 and 89.5% for volatile solids and 99.2, 97.7 and 95.3% for organic charges at the 13, 8.3 and 6.6 days HRTs, respectively. The best specific biogas production was 0.65 LbiogasLreactor-1 d-1 at the 8.3 days HRT, with a mean methane content of 59%. The best COD removals and biogas production by CODrem were obtained at the 8.3 days HRT. The best VS removal and biogas production by VSrem occurred at the 6.6 days HRT. It was concluded that the anaerobic stabilization of cassava starch wastewater using a one-phase horizontal reactor occurred efficiently.
Keywords:Alkalinity,
biodigestion, biogas, cassava starch, chemical oxygen demand, effluent, fermentation, hydraulic retention time, one-phase horizontal reactor, wastewaterJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 1
Category: Environment
Pages: 1118-1120
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