Pró-Reitoria de Pesquisa e Pós Graduação (PRPPG), Universidade do Sagrado Coração (USC), Bauru, São Paulo, 17011-160, Brazil.
Faculdade de Ciências, Departamento de Química, Universidade Estadual Paulista (Unesp), Bauru, São Paulo, 17033-360, Brazil.
Environ Monit Assess. 2018 Apr 3;190(5):263. doi: 10.1007/s10661-018-6633-3.
In sewage treatment plants, physicochemical parameters are highly controlled since treated sewage can be returned to water bodies or reused. In addition, pollutants such as heavy metals also deserve attention due to their potential toxicity. In general, these characteristics of sewage and treated water are evaluated independently, with the support of Brazilian legislation that does not require a routine for the analysis of metals as frequent as for the physicochemical parameters. In this work, 66 samples of raw sewage, treated sewage, and effluents from two treatment plants in the city of Bauru, São Paulo, Brazil, were evaluated to assess the efficiency of the treatment plants in the removal of metals. In addition, the influence of these pollutants on the quantification of physicochemical parameters was evaluated. The quantification of metals was performed using inductively coupled plasma optical spectroscopy (ICP-OES), and Spearman's test was applied to evaluate correlation between physicochemical parameters and metal content. The main metals found in the samples were Ba, Mn, Zn, Cu, Se, Fe, and Al. The results indicate that concentrations of metals in the aquatic environment can significantly affect the physicochemical parameters, since high concentrations of metals can interfere mainly in the pH, chemical oxygen demand, and dissolved oxygen.
在污水处理厂，理化参数受到高度控制，因为处理过的污水可以返回水体或再利用。此外，由于重金属的潜在毒性，这些污染物也值得关注。一般来说，这些污水和处理水的特性是分开评估的，这得益于巴西立法，该立法不要求像理化参数那样频繁地对金属进行例行分析。在这项工作中，评估了来自巴西圣保罗包鲁市的两个处理厂的 66 份原污水、处理污水和废水样本，以评估处理厂去除金属的效率。此外，还评估了这些污染物对理化参数定量的影响。金属的定量使用电感耦合等离子体光学光谱法（ICP-OES）进行，Spearman 检验用于评估理化参数与金属含量之间的相关性。在样品中发现的主要金属是钡、锰、锌、铜、硒、铁和铝。结果表明，金属在水环境中的浓度会显著影响理化参数，因为金属的高浓度主要会干扰 pH 值、化学需氧量和溶解氧。
