Department of Chemical Engineering, NFC Institute of Engineering & Technology, Multan, Pakistan.
Department of Chemical Engineering, NED University of Engineering & Technology, Karachi, Pakistan.
Water Environ Res. 2021 Dec;93(12):2931-2940. doi: 10.1002/wer.1639. Epub 2021 Oct 19.
In this current work, the performance of an aerobic granular sludge (AGS) for real textile wastewater was investigated based on system operational parameters evaluation. The study was performed for 90 days, and sampling was done once a week in which textile dyeing effluent from the textile mill was collected and subjected to laboratory-scale treatment. The samples from the inlet, the outlet of the wastewater plant, and within the bioreactor were collected at various concentrations of mixed liquid suspended solids (MLSS), and hydraulic retention remained the same in the investigated period of 53 h. The objective of this study was to analyze the AGS system performance assessment by evaluating the effect of different MLSS concentrations on chemical oxygen demand (COD), total suspended solids (TSS), and oil/grease removal from real-based textile water. The results showed that removal of organic material from the process water increases with an increase in MLSS concentration in the bioreactor and gradually shifts removal of COD from 91.2% to 94.5%. As the concentration of microorganisms in the reactor (aeration tank) increases, the degradation of waste organics in the wastewater increases as well. Moreover, the % removal of TSS (83.5% to 98%) and removal of oil/grease (62.5% to 76.4%) were also increased. These results ultimately suggest that the utilization of an activated sludge system can effectively treat complex and highly polluted denim textile wastewater to avoid secondary pollution posed by this industry. PRACTITIONER POINTS: The effectiveness of aerobic granular sludge was investigated for industrial textile effluent. The increase in MLSS results in increase of % COD removal efficiency to 94.5%. The AGS system can efficiently treat complicated and highly contaminated textile wastewater.
在本项当前工作中，我们基于系统操作参数评估，考察了好氧颗粒污泥（AGS）处理实际纺织废水的性能。该研究持续了 90 天，每周进行一次采样，收集来自纺织厂的纺织废水并进行实验室规模的处理。在不同混合液悬浮固体（MLSS）浓度下，从废水处理厂的进水口、出水口和生物反应器内采集样品，并在研究期间保持相同的水力停留时间 53 小时。本研究的目的是通过评估不同 MLSS 浓度对实际基于纺织水的化学需氧量（COD）、总悬浮固体（TSS）和油/油脂去除的影响，分析 AGS 系统的性能评估。结果表明，随着生物反应器中 MLSS 浓度的增加，工艺水中有机物质的去除率增加，COD 的去除率逐渐从 91.2%增加到 94.5%。随着反应器（曝气池）中微生物浓度的增加，废水中的有机物降解也随之增加。此外，TSS 的去除率（83.5%至 98%）和油/油脂的去除率（62.5%至 76.4%）也有所提高。这些结果最终表明，利用活性污泥系统可以有效地处理复杂且高度污染的牛仔布纺织废水，避免该行业造成的二次污染。
