Clogging dynamics of driplines under the application of soluble iron, suspended solids and fitoplankton / Dinâmica do entumpimento de tubos gotejadores sob aplicação de ferro solúvel, sólidos em suspensão e fitoplâncton

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This research project was developed to quantify possible disturbances of flow rate in drip emitters subject to the application of soluble iron, suspended solids (soil particles) in water containing organic material (phytoplankton / algae), with emitters outlet positioned down and up. Two experiments were carried out A and B during 12 months period, using 16 models of new drip tubes and 26 models of used drip tubes. The tests were conducted on a bench test located at the Irrigation and Drainage Laboratory of the University of Sao Paulo (ESALQ / USP). Experiment A implemented 4 treatments (T1, T2, T3 and T4) in two phases: in phase 1 it was evaluated the susceptibility of different drip tube to clogging by soluble iron under two water qualities (with and without organic load) and in phase 2 it was assessed the susceptibility of different drip tube for clogging by the application of soluble iron, organic load (phytoplankton / algae) and suspended solids with emitters outlet positioned up and down, still in phase 2 it was applied a concentrated solution in T1 and T4, with a concentration relation 1:30, directly to drip tubes, without passing through the filter, this procedure was adopted to simulate the amount of material sedimented in a lateral line of drip tubes installed in the field, of approximately 300 meters. Experiment B carried out two treatments (T5 and T6) which evaluated the susceptibility of different used drip tube for clogging by soluble iron, organic load (phytoplankton / algae) and suspended solids (soil particles). The experimental design was completely randomized, with the test "F" for variance analysis and Tuckey test at 5% of significance to comparison of means. The results showed that applying suspended solids and high content of iron, without passing through the filtering system (T1 and T4/Fase 2/experiment A) intensified the clogging process and the addition of soil particles to treatments through the filtering system (T2 and T3/Fase 2/experiment A) presented no significant change in the scenario of the most different types of drip tubes tested. The positioning of emitters outlet down was more susceptible to clogging. The treatments performed in experiment A showed that the models A, C and L presented the better performance, maintaining their nearly constant flow rate even when subjected to more aggressive treatments (T1 and T4/Fase 2/experiment A). The treatments implemented in experiment A showed that the models E, F, G and P were those that suffered more obstruction. Models E and F also showed the worst performance when subjected to the tests T5 treatment (iron hydroxide + water LAB) of the experiment B.

ASSUNTO(S)

runoff soil moisture. erosion gotejadores ferro irrigação localizada. fitoplâncton soil covering Água de irrigação - qualidade

ACESSO AO ARTIGO

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