| Cold Rolling Steel Wastewater Treatment Using an Aerobic Membrane Bioreactor (MBR): Performance and Membrane Fouling |
| کد مقاله : 1657-IWWA |
| نویسندگان |
|
امین حیدری *1، الهام عبداله زاده شرقی2، بابک بنکدارپور3 1دانشجو کارشناسی ارشد مهندسی شیمی دانشگاه صنعتی امیرکبیر 2دانشیار گروه پژوهشی محیط زیست پژوهشگاه مواد و انرژی استاد راهنمای دوم پروژه 3استاد دانشکده مهندسی شیمی دانشگاه صنعتی امیرکبیر استاد راهنمای اول پروژه |
| چکیده مقاله |
| Cold-rolling steel wastewater contains a complex mixture of organic and inorganic contaminants, making its effective treatment a significant challenge for sustainable water management and potential water reuse. In this study, the performance of an aerobic membrane bioreactor (MBR) was experimentally investigated for the treatment of real wastewater collected from the outlet of the pretreatment units of cold-rolling line of Mobarakeh Steel Company, Iran (influent chemical oxygen demand (COD): 300–320 mg/L). The laboratory-scale system consisted of a 4.5 L MBR equipped with a 0.1 μm PVDF membrane and was operated continuously for 34 days at a hydraulic retention time (HRT) of 12 h and a sludge retention time (SRT) of 20 days. During the acclimation period, biomass concentration, sludge morphology, microbial activity, COD and turbidity removal and membrane fouling were evaluated. The results showed that the MLSS concentration reached 1700±153 mg/L, while the MLVSS/MLSS ratio remained at 0.55±0.05. Sludge settleability improved during MBR operation, with the SVI decreasing to 28±1.5 mL/g MLSS. The COD and turbidity removal efficiencies increased during the acclimation period and stabilized at 75±2.5% and 98.5±0.2%, respectively. Membrane fouling was strongly affected by the operating mode; the average fouling rate increased from approximately 0.063 to 0.47 kPa/d after membrane relaxation was eliminated, resulting in a maximum TMP of approximately 6 kPa. Overall, the results demonstrate the potential of aerobic MBR technology for effective treatment of real cold-rolling steel wastewater and provide practical insights for its scale-up, while highlighting the importance of relaxation operation for controlling membrane fouling. |
| کلیدواژه ها |
| Membrane bioreactor (MBR), Cold-rolling wastewater, Steel industry, COD removal, Membrane fouling, Sludge morphology |
| وضعیت: پذیرفته شده برای ارائه شفاهی |
