DISCHARGE OF DRIPPERS WITH TREATED SANITARY SLUDGE AND THE PREVENTION OF CLOGGING WITH ENZYMATIC CATALYZER

Abstract

Water reuse is an important management activity integrated with water resources that makes possible conviviality with hydric scarcity in the Brazilian semi-desert region. The drip irrigation system is highly adequate for the application of treated sanitary sludge, although drip clogging may be the main obstacle for the adoption of the technology. Current study analyzes the discharge of drips with treated sanitary sludge and the prevention of obstruction by enzymatic catalyzer. Two assay benches were prepared for the evaluation, at every 80 h, of discharge of four drip types, applying sanitary sludge treated during 400 h. Assay was prepared in a totally randomized sub-sub-plot scheme, with three replications, with doses of enzymatic catalyzer as follows: T1 – drip unit without the application of catalyzer; T2 – drip unit with 100 ml of catalyzer every 80 h; T3 – drip unit with 200 ml catalyzer every 80 h; and T4 – drip unit with 300 ml catalyzer every 80 h; sub-plots had the following drip types (Netafim Super Typhoon, Netafim Tiran, Netafim Streamline and Naan Dan Jain Tal Drip); in sub-sub-plot the periods of evaluation for drip charge were (0, 80, 160, 240, 320 and 400 h). Enzymatic catalyzer failed to avoid drip obstruction due to the high concentration of chloride in the treated sanitary sludge. Cubic, quadratic and linear regression models were the best for discharge data due to operation time through biological treatment. Multiple linear regression analyses revealed that attributes SD, SS and pH greatly interfered in the clogging process of drips with treated sanitary sludge.