In Brazil, wastewater treatment coverage is low. Even when treatment is carried out, many municipalities cannot achieve adequate levels of contaminant removal, and the usual practice of releasing raw or treated domestic effluent into water bodies remains. Thus, this pollution source puts pressure on water resources, compromising downstream uses of the disposal. This study has two aims: (1) to evaluate the performance of sewage treatment plants and (2) to determine the impact of discharging treated effluent on the water quality of receiving water bodies located within an urbanized area in the Velhas River basin, Minas Gerais State, Brazil. Monitoring data from raw wastewater were compared with typical ranges reported in literature, and effluent concentrations were compared between plants. The monitoring data of the receiving water bodies collected at points upstream and downstream of each disposal were statistically compared. Different performances between the systems and significant alterations in the receiving bodies resulting from the discharge of the treated effluents were found.

在巴西，废水处理覆盖率很低。即使进行了处理，许多市政当局也无法达到足够的污染物去除水平，并且仍然存在将生的或处理过的生活污水排放到水体中的常规做法。因此，这种污染源给水资源带来了压力，损害了该处置的下游用途。这项研究有两个目标：（1）评估污水处理厂的性能；（2）确定排放处理后的废水对位于米纳斯吉拉斯州Velhas河流域城市化地区的接收水体水质的影响。巴西州立。将原废水的监测数据与文献报道的典型范围进行了比较，并对工厂之间的废水浓度进行了比较。对每个处置上游和下游各点收集的接收水体的监测数据进行统计比较。发现系统之间的性能不同，并且由于处理后的废水排放而导致接收体发生重大变化。