Aspectos sanitários e agronômicos do uso de esgotos tratados na irrigação do Capim Tanzânia (Panicum Maximum Jacq. cv. Tanzânia) - Aquiraz, Ceará

Abstract

This research evaluated the sanitary and agronomic aspects of the use of treated wastewater in the irrigation of Tanzânia grass (Panicum maximum Jacq. cv. Tanzânia). The experiments had been carried through in the Center of Research on Wastewater Treatment and Reuse of the Company of Water and Wastewater of the Ceará in Aquiraz, Ceará. The culture of Tanzânia grass was irrigated with water of well and treated wastewater with different dosages to fertilizer. The method of irrigation for microaspersion, divided was used block-type, and applied four different treatments. The used treatments had been: irrigation with well water (T1), irrigation with treated wastewater (T2), irrigation with treated wastewater more complete fertilization recommended (T3) and to irrigation with treated wastewater more half to the recommended fertilization (T4). Analyses had been carried through physicist-chemistries and microbiological in the water of the well and the effluent one of the last lagoon of stabilization of the Station of Wastewater Treatment (ETE) of Aquiraz, used in the irrigation, where if it contacted significant differences, but the values met inside of acceptable levels for this use. In the culture of Tanzânia grass it was collected samples for the microbiological analyses and chemical and bromatologic. The results of the microbiological analyses in Tanzânia grass had presented acceptable values in all the applied treatments. A lesser decline of the presence of pathogenic microorganisms in the treatment irrigated with wastewater more recommended complete fertilization (T3) was observed. The quality for consumption and digestibility of Tanzânia grass for the animals was evaluated by means of chemical and bromatologic analysis, on the basis of parameters as: dry substance (MS), rude protein (PB), etereo extract (EE), mineral residue (RM), fiber in acid detergent (FDA) and fiber in neutral detergent (FDN). The treatments irrigated with treated wastewater (T2, T3 and T4) had presented better values that the treatment irrigated with water of the well (T1).