| Title |
Treatment of Packing House Wastewater by ASBR and SGBR systems: The Effects of HRT on Reactor Performance |
| Authors |
정진영 ( Jin Young Jung ) ; 정윤철 ( Yun Chul Chung ) |
| Keywords |
Anaerobic Sequencing Batch Reactor; Static Granular Bed Reactor; Packing House Wastewater; Hydraulic Retention Time |
| Abstract |
Two lab scale anaerobic reactors, anaerobic suquencing batch reactor (ASBR) and static granular bed reactor (SGBR), were operated to evaluate performances of packed house wastewater treatment by changing the HRT (hydraulic Retention Time) from 48 to 12 hours. The start-up time for both the ASBR and SGBR were short; less than one month. This was primarily due to the use of active granular sludge as a seed biomass. Throughout the study, the SGBR reactor produced good effluent quality; lass than 30 mg/L SS and BOD_5 concentrations. However, the ASBR system showed slightly higher effluent SS and COD concentration than the SGBR system due to biomass washout during the cyclic decanting. Bath systems showed good COD removal at HRTs from 48 to 24 hours. In case of ASBR, COD removal decreased and the effluent SS concentration increased with the HRT from 24 to 18 hours. With respect to the differences between the ASBR and SGBR systems, it was clear that the SGBR offered advantages over the ASBR system. The SGBR had better effluent quality as evidenced y lower VFA, BOD_5, COD, and TSS concentrations. The discrepancies in effluent quality became more dramatic as the HRT decreased below 14 hours. While stable SGBR operation was observed at HRTs as low 12 hours, the ASBR performance became erratic from the 18 hours HRT. |