Avaliação da influência urbana na alteração da qualidade da água do rio Lonqueador

Abstract

Water is a natural resource essential to the maintenance of life on the planet, it's essencial knowing about the quality of water. The Lonqueador River watershed is a tributary of the Marrecas River, It is located between the municipalities of Marmeleiro and Francisco Beltrão, southwestern Paraná. We sought to evaluate the urban influence on the water quality of the Lonqueador River. The analysis was carried out by comparing the water quality at two points, one in the middle valley, where there is no significant urban influence, and the other at the mouth, where the urban influence is significant. Four collections were made, and the flow was measured, to relate to the concentration of pollutants and calculate their discharge. The physical-chemical parameters analyzed were pH, temperature, dissolved oxygen, oils and greases, sedimentary and total solids, BOD, COD and an acute toxicity test, using the microcrustacean Artemia salina. In the mean value the COD discharge was 153.4530 kg.day-1 and the BOD was 126.3593 kg.day-1, the difference between them is 27.0937 kg.day-1, which represents the non-biodegradable matter. The mass ratio of COD and BOD at the mouth are 579.4437 and 416.9726 kg.day-1, respectively. The difference between them is 162,4711 kg.day-1. The mass rate of oils and greases at the mouth was 1130,3563 kg.day-1, indicating, possibly, intense activity in automotive service establishments. Through the physical-chemical analyses, the urban influence on the water quality of the Lonqueador River became evident.