Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Wrocław, Poland.
Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Grunwaldzki Sq. 24, 50-363, Wrocław, Poland.
Sci Rep. 2024 Sep 27;14(1):22257. doi: 10.1038/s41598-024-72995-8.
The primary objective of this study was to assess the operational conditions of the municipal wastewater treatment system. This system comprises a wastewater treatment plant that employs the activated sludge process, along with wastewater stabilization ponds as the third stage of treatment. The operating conditions of the wastewater stabilization ponds were observed during both normal operation and malfunction scenarios. The average values of the pollutant parameters at the inlet and outlet of the ponds did not differ significantly. However, an increase in the concentrations of total organic carbon (TOC) and phosphates was observed at the ponds' outlet. Specifically, the TOC increased from 2.25 mg/dm (inlet) to 5.02 mg/dm (outlet), while phosphates rose from 0.34 mg/dm (inlet) to 3.02 mg/dm (outlet). The analyzed pollutants in the wastewater stabilization ponds samples were characterized by seasonal variability, particularly concerning TOC, dissolved oxygen, ammonium nitrogen, and phosphates. During malfunctions, the highest pollutant load (including activated sludge and precipitated phosphorus) was delivered to the first wastewater stabilization pond, inducing the phenomenon of internal loading, leading to increase in phosphates concentrations. To mitigate such issues, the main force should be focused on the proper operation of the wastewater stabilization ponds and wastewater treatment plants.
本研究的主要目的是评估城市污水处理系统的运行状况。该系统包括采用活性污泥法的污水处理厂，以及作为第三处理阶段的废水稳定塘。在正常运行和故障情况下，观察了废水稳定塘的运行条件。塘进出口处的污染物参数平均值没有显著差异。然而，在塘的出口处观察到总有机碳（TOC）和磷酸盐浓度的增加。具体来说，TOC 从 2.25mg/dm（进口）增加到 5.02mg/dm（出口），而磷酸盐从 0.34mg/dm（进口）增加到 3.02mg/dm（出口）。废水稳定塘样品中的分析污染物具有季节性变化特征，特别是 TOC、溶解氧、氨氮和磷酸盐。在故障期间，最高的污染物负荷（包括活性污泥和沉淀磷）被输送到第一个废水稳定塘，导致内部负荷增加，导致磷酸盐浓度增加。为了解决这些问题，应将主要力量集中在废水稳定塘和污水处理厂的正常运行上。
