Tratamento de água do poço do bairro Icídua através da Quitosana extraída da carapaça de camarão pescado, na cidade de Quelimane província da Zambézia

Abstract

The present study was carried out on the process of obtaining chitosan from shrimp shells from artisanal fisheries, with the purpose of treating water from the well in the Icidua neighborhood. The study was conducted over a period of 5 months from June to October 2018. A quantity of 1 kg of shrimp shell samples was collected at the chapo-chapo restaurant in the city of quelimane, and the chitosan was extracted and analyzed for the water treatment in the Chemistry and Biology laboratory at ESCMC. The shrimp shells were washed and left to dry for 48 hours in the open air, then they were crushed in a pestle and the processes of Demineralization, Deproteination, Depigmentation, Deacetylation continued, in order to remove the acetyl group (-COCH3) from the acetamide functions ( -NHCOCH3) present in the chitin polymer, where he obtained the chitosan itself with an amount of 30g. The study water was collected in the neighborhood of Icidua in the homemade well with an amount of 1L, kept in a pvc bottle, it was taken and the first analysis carried out in the FIPAG laboratory where it presented the following parameters namely pH 7.55, turbidity 11.72, alkalinity 15, total iron 1, nitrites 0.016, nitrates 7.4, chlorine 49.63, fecal coliforms 5 respectively, it was treated with the same amount of 1L of water, 5mL of chitosan was added in liquid and then it was kept in rest for 24 hours and after filtration. And finally the analysis of water having lowering the parameters for the following values ​​of pH 7, turbidity 5, alkalinity 10, total iron 0.3, nitrites 0.003, nitrates 6, chlorine 0.5, fecal coliforms 0. Chitosan showed to be better in the treatment of water, making it clean, odorless and potable.