Efficiency Evaluation of Expanded Granular Sludge Blanket (EGSBR) to treat the Tannery Wastewater in an Anaerobic Digestion

The tannery wastewater is highly hazardous and intricate, what is discharged without proper treatment and also it affect the environment and human health. In Tamil Nadu, there are numerous small scale tannery industries has discharged large amount of tannery wastewater in river stream. The proper treatment process is necessary. The aim of this study was to investigate the performance efficiency of EGSBR, removal percentage of COD, Chromium removal and recovery of biogas in an anaerobic digestion. The varying hydraulic retention time 5.21, 2.60, 1.74, 1.30 and 1.04 days followed throughout the experiment. The efficiency of COD removal percentage was attained 85.52% with 0.27 m 3 /kg COD of biogas production at 5.21 days of HRT, with an 1.512 kg COD/m 3 of Organic loading rate. The decrease in Volatile fatty acid and Volatile suspended solid shows the active performance of microorganism in the reactor. The percentage of chromium removal efficiency was 85% with a 1.436 kg COD/m 3 /day OLR at 5.21 days of HRT. The maximum biogas generation was 0.27 m 3 /kg COD. The kinetic modeling was studied for the substrate degradation.