Fragment of starch to glucose to identify waste water from manioc industry in depth of soil - DOI: 10.4025/actasciagron.v27i3.1463

Abstract

This paper was carried out in the Irrigation Technical Center of Universidade Estadual de Maringá. It aimed to evaluate filter capacity to waste water of the compound soil columns with 83% of sand, 1% of silt and 16% of clay. Six columns were utilized with 0.20 m of diameter (superficial area of 0.031 m²) by 0.50 m of high (total volume of 0.015 m³). The presence of starch was identified in the percolated grass effluent of the columns and, by the acid starch hydrolysis method the present soluble sugar content was quantified in the same percolated effluent, after columns saturation. It was possible to conclude that the starch from waste water was totality retained into the soil columns, percolating only hydrolyzed sugar and water. Results also showed that the concentration of cyanide and the DBO and DQO rates from percolated waste water were over the maximum rate permitted by Environmental Law to be used in the soil; 87.07% of all present solids in the waste water of manioc starch are organic matter and that justifies its high DBO (and/or DQO).