Latif E F
Deptartment of Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt.
Environ Monit Assess. 2022 Mar 31;194(4):323. doi: 10.1007/s10661-022-09968-9.
Conventional activated sludge system is confidently widely used for biological treatment plants of municipal wastewater but suffering from operation problems that affect their efficiencies and effluent qualities, especially when treating low-strength wastewater with increasing incoming flow. The objective of this study is to evaluate and compare the novel methods used in upgrading conventional activated sludge treatment systems receiving low-strength wastewater to generate good effluent quality. GPS-X Simulator V 8.0 was used for model calibration and plant performance prediction. The calibrated GPS-X model proved that eliminating primary settling from the treatment process does not affect BOD and COD removal, while TSS removal is decreased, and NH-N removal is increased. Increasing the return activated sludge flow from 50 to 150% of influent flow does not affect conventional activated sludge process, while the change of waste activated flow had a vital effect on process performance. The presence of an anoxic zone in conventional activated sludge processes treating low-strength wastewater has no significant impact on plant performance. Also, the model outputs proved that adding filling media to the aeration tank was able to handle an increase of influent flow and a stable performance of BOD, and NH-N removal was observed.
传统活性污泥系统在城市污水处理厂中得到了广泛应用，但存在影响其效率和出水水质的运行问题，尤其是在处理低强度废水且进水流量增加时。本研究的目的是评估和比较用于升级处理低强度废水的传统活性污泥处理系统以产生良好出水水质的新方法。使用GPS-X模拟器V 8.0进行模型校准和工厂性能预测。校准后的GPS-X模型证明，从处理过程中去除初次沉淀不会影响生化需氧量（BOD）和化学需氧量（COD）的去除，而总悬浮固体（TSS）去除率降低，氨氮（NH-N）去除率增加。将回流活性污泥流量从进水流量的50%增加到150%不会影响传统活性污泥工艺，而废弃活性污泥流量的变化对工艺性能有重要影响。在处理低强度废水的传统活性污泥工艺中设置缺氧区对工厂性能没有显著影响。此外，模型输出结果表明，向曝气池中添加填料能够应对进水流量的增加，并观察到BOD和NH-N去除性能稳定。
