DESEMPENHO HIDRÁULICO DE GOTEJADORES SOB O TEMPO DE EXPOSI-ÇÃO AO ESGOTO DOMÉSTICO TRATADO

Abstract

The treated domestic wastewater use in agricultural production has increased in research pro-jects, because providing nutritional qualities available to the plants. However, studying the challenges that this water source can cause to the this irrigation system located, is an important result to the sustainability of pro-duction. The current study has to evaluate the hydraulic performance of emitters under time exposure of drip-pers in the domestic sewage. With the performance evaluation system hydraulic prepared on a bench was car-ried out two experiments in a completely randomized design (CRD). In the first experiment, the treatments were three pressures (kPa) supplied to the system and in the second the treatments were made by operating time in interval of 60 h (composing seven intervals) with 28 drippers as repetitions. The system performance was evaluated for each treatment by the coefficient of distribution uniformity (CUD) and Christiansen's uni-formity coefficient (CUC). There was no statistical significance was set at a 5% for the different pressures, but there will be 1% for different times. When the CUD and CUC fell to 60 and 70 %, respectively, was cleaned with sodium hypochlorite. The system showed uniformity acceptable in the first 120 hours of operation with no need for cleaning. According to the coefficients evaluated this cleaning must occur before the 180 h, however, suggests that to maintain good uniformity this procedure should be done every 60 h.