| Abstract |
| Textile wastewater has high levels of chemical oxygen demand (COD), suspended solids (SS), color, and salinity. The objective of this research was to evaluate the performance of anaerobic/aerobic activated sludge (ANOAS) processes coupled with a high-rate filter (HRF) in treating textile wastewater along with the influence of water temperature. An HRF with a filtration velocity of 200 m/d was evaluated as an alternative process to conventional primary sedimentation (CPS) processes. The ANOAS processes consisted of four reactors (an anaerobic reactor, two selectors (anoxic or oxic), and an aerobic reactor), each with a hydraulic retention time (HRT) of 4 h. The influent characteristics were as follows: BOD 746.0 mg/L, COD 492.0 mg/L, T-N 34.7 mg/L, T-P 7.0 mg/L, SS 296.4 mg/L, color 647.0 pt-Co. As a result, the efficiencies of both the HRF and the ANOAS processes in reducing COD and color from the textile wastewater increased with increasing water temperature. In the case of COD removal, the efficiencies of the HRF and ANOAS processes at < 23℃ were < 20% and < 70%, respectively, while at > 25℃, they were 30% and 85%, respectively. In the case of color removal, the efficiencies of the HRF and ANOAS processes at < 23℃ were < 10% and < 40%, respectively, while at > 25℃, they were 20-30% and 50-60%, respectively. Based on the above results, the performance efficiency of the HRF process with a much shorter HRT was very similar to that of the CPS process with a longer HRT of 3.0 h. Compared with the existing physicochemical-sequencing batch reactor system, the most efficient configurations of the combined HRF/ANOAS system with a shorter HRT achieved both higher COD and color removal efficiency and lower sludge production due to the higher SS removal of the HRF process. |
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| Key Words |
| 고율여과지, 생물막여과조, 혐기-호기영역, 염색폐수, High-rate Filter, Biofilters, Anaerobic-aerobic Zones, Real Textile Wastewater |
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