Performance and cost-benefit analysis of anaerobic moving bed biofilm reactor for pretreatment of textile wastewater

Performance of an anaerobic moving bed biofilm reactor (AnMBBR) was evaluated for pretreatment of real textile desizing wastewater at organic loading rate (OLR) of 1 +/- 0.05 to 6.3 +/- 0.37 kgCOD/m(3)/d. After OLR optimization, the performance of AnMBBR was evaluated for biodegradation of reactive dyes. AnMBBR was operated under a mesophilic temperature range of 30 to 36 degrees C, while the oxidation-reduction potential (ORP) and pH were in the range of 504 to 594 (-mV) and 6.98 to 7.28, respectively. By increasing the OLR from 1 +/- 0.05 to 6.3 +/- 0.37 kgCOD/m(3)/d, COD and BOD5 removal was decreased from 84 to 39% and 89 to 49%, respectively. While the production of biogas was increased from 0.12 to 0.83 L/L center dot d up to an optimum OLR of 4.9 +/- 0.43 kgCOD/m(3)/d. With increase in the dye concentration in the feed, COD, BOD5, color removal and biogas production reduced from 56, 63, 70% and 0.65 L/L center dot d to 34, 43, 41% and 0.08 L/L center dot d, respectively. Based on the data obtained, a cost-benefit analysis of AnMBBR was also investigated for the pretreatment of real textile desizing wastewater. Cost estimation of anaerobic pretreatment of textile desizing wastewater indicated a net profit of 21.09 million PKR/yr (114,000 euro/yr) and a potential payback period of 2.54 years.