Effect of temperature on biodegradation of textile dyeing effluent using pilot scale UASB Reactor

Abstract This study deals with the effect of temperature on treatment of real textile dyeing effluent using pilot scale two-phase Upflow Anaerobic Sludge Blanket (UASB) reactor with sago effluent as co-substrate under recycle mode. The temperature of the reactor was varied viz. 35, 40, 45 and 50 0C. The feed of the reactor was 30% of methanogenic outlet recycled and 70% of 70/30 (sago/textile dyeing effluent) mixing ratio were given at the bottom of the reactor. The reactor was operated at 24 h of HRT. The performance of the bioreactor was evaluated by monitoring the removal of Chemical Oxygen Demand (COD), removal of color, Volatile Fatty Acid (VFA) and biogas production. The overall COD and color removal were achieved maximum of 98.4% and 99.3% respectively. Based on temperature, the biogas production (0.512 m3/d) was maximum at 450C. From the VFA and alkalinity ratio values obtained indicate that the reactors were operated under steady state. The results shows, that the sago and textile dyeing effluent have wide variation in their characteristics were treated on combination, whereas the recycle ratios maintain the stability of reactor. This new technology supports the effective utilization of sago effluent in destruction of dyeing effluent; the optimum temperature for efficient reactor operation was 450C.

Keywords Textile dyeing, sago, UASB, temperature, recycle.

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