Survey of Basic Red 18 Dye Removal Using Biofilm Formed on Granular Bagass in Continuous Aerobic Reactor

Document Type : Research Paper


1 Assoc. Prof. of Environmental Health, Member of Health Promotion Research Center, Faculty of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran

2 Assoc. Prof. of Environmental Health, Member of Health Promotion Research Center, Faculty of Public Health, Zahedan University of Medical Sceinces, Zahedan, Iran

3 MSc Student of Environmental Health, Faculty of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran

4 Instructor of Environmental Health, Member of Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran


Dyes comprising a major pollutant in the effluent from textile plants are mostly toxic, carcinogenic, mutagenic, and non-biodegradable. This experimental-laboratory study was carried out using a biofilm formed on a granular bagass bed in a continuous aerobic reactor to investigate the kinetic coefficients of the aerobic reactor as well as the effects of color concentration (30-200 mg/l), hydraulic retention time (2-8 h), and BOD concentration (200-100 mg /l) on the removal of Basic Red (18) from textile effluents. The results revealed a maximum removal efficiency of 90% for an initial color concentration of 30 mg/l and a hydraulic retention time of 8 hours. A color removal efficiency of 86% was recorded for an influent BOD concentration of 200 mg/l. Also, maximum substrate utilization rate (K) for organic loadings of 100 and 200 mg/L were 0.23 and 1.41 while the half velocity constant values were 44.85 and 19.39, respectively. Moreover, for the same organic loadings, the values of 0.35 and 0.5 were recorded for decay coefficient (Kd) and 37.36, 4.83 for maximum specific growth rate coefficient (μm), respectively. Based on the findings of this study, it may be claimed that the biofilm formed on a granular bagass bed in a continuous aerobic reactor has a good Basic Red (18) removal efficiency.


Main Subjects

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