LIXIVIAÇÃO DO SOLO COMO AGENTE DE ALTERAÇÃO DOS PARÂMETROS DE ÁGUA EM TANQUE ESCAVADO

• DOI: https://doi.org/10.22533/at.ed.0692412065

• Palavras-chave: aquicultura; compostos nitrogenados; qualidade de água; remediação

• Keywords: aquaculture; nitrogenous compounds; water quality; remediation

• Abstract: Introduction: Aquaculture activity has the potential to generate changes in aquatic ecosystems, due to increased concentrations of nitrogen and phosphorus in the water column and the accumulation of organic matter in sediments. Due to concerns in recent years regarding the dumping of effluents into bodies of water, since even though it represents around ¾ of the earth's surface, only 3% of it is suitable for consumption, with the majority of it being frozen in ice caps, leaving then a need to use it in a more sustainable way. Objective: Monitor the quality of water supplied to fish, as well as analyze whether the cultivation environment can act as a remediator, returning water with the best quality of what was captured, mainly contributing to the preservation of aquatic organisms. Case study: The study began in the 3rd month of an experimental analysis period that would last 7 months, after a week of storms, which resulted from changes in water turbidity to increases in pH, concentrations of nitrogenous compounds (ammonia, nitrite, nitrate) and orthophosphate. Seeking to identify the altering potential, and if it reached in other locations of the experiment, monthly monitoring of water quality in the reservoir (named Lavoisier) and excavated tank continued. Additionally, a simulated leaching test was conducted to identify if it could be the reason for peaks in water analyses. Results: The parameters evaluated underwent variations during the analysis period, later stabilizing in the final months of analysis of the work, and it was possible to carry out water analyses from the simulated soil leaching test. Conclusion: At the end of the experiment it was concluded that the main cause of the changes that occurred in the turbidity and analysis of the water periods was a natural process of leaching of the soil content around the tank, caused by storms.