Multivariate statistics on wastewater quality used in irrigation in the Brazilian semiarid region
DOI:
https://doi.org/10.6008/CBPC2179-6858.2019.004.0010Keywords:
Reuse, Statistical analysis, Microbiological, Heavy metalsAbstract
The semiarid of northeastern Brazil is characterized by rainfall irregularities and high temperatures. These characteristics become a limiting factor for the region's agricultural production, reducing water availability, especially if they meet ideal parameters for irrigation. Thus, the objective of this study was to evaluate multivariate statistics as a tool to analyze the quality of wastewater used by farmers in the semiarid region. Data collection was performed in three cities of the semiarid region in two distinct periods. Laboratory analyzes of chemical, physical and microbiological parameters and their classification as to the indication for water use for irrigation were performed. Principal component analysis was performed to verify the parameters that had the greatest influence on water quality in the cities studied in both periods and hierarchical cluster analysis to verify the familiarity of the parameters. The quality of surface water was influenced by where it came from, such as groundwater, which was influenced by the chemical composition of the soil and the use of inefficient pits. The superficial was influenced mainly by sewers and pollution of industries and vehicles. The waters were also influenced by the volume of precipitation, having a lower quality when it presented larger volume of rain.
Downloads
Downloads
Published
Issue
Section
License
The CBPC - Companhia Brasileira de Produção Científica (Brazil CNPJ: 11.221.422/0001-03) the material rights of the published works. The rights relate to the publication of the work anywhere in the world, including rights to renewals, expansions and dissemination of the contribution, as well as other subsidiary rights. All electronically published works may subsequently be published in printed collections under the coordination of this company and / or its partners. The authors preserve the copyright, but are not allowed to publish the contribution in another medium, printed or digital, in Portuguese or in translation.