Desenvolvimento de um sistema para o controle do pH da água para microirrigação

Pinto, Marinaldo Ferreira; Camargo, Antônio Pires de; Almeida, Alexsandro C. S.; Alves, Dinara Grasiela; Botrel, Tarlei Arriel

doi:10.1590/s1415-43662011000200015

Cited by 12 publications

(13 citation statements)

References 13 publications

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“…Preventive measures such as filtration, injection of chemicals and washing of the lines (Puig-Bargués et al, 2010;Pinto et al, 2011) can be adopted to avoid this problem.…”

Section: Introductionmentioning

confidence: 99%

Flow rate dynamics of pressure-compensating drippers under clogging effect

Pinto

Molle

Alves

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe clogging dynamics of pressure-compensating drippers is still poorly addressed, and its understanding is quite important to control clogging. The aim of this study was to evaluate the flow performance of pressure-compensating drippers under clogging effect. Eight pressure-compensating emitters, model J-SC Jain PC-PLUS with nominal flow rate of 2.2 L h -1 were evaluated. The tests were run for 8 h d -1 for 4 weeks, a total of 160 h. Every 40 h, the concentration and granulometry of suspended particles were increased, by adding 125 mg L -1 of solids, composed of sand. The flow rate of the emitters was determined using a weight measurement system. Flow rate variations of the emitters did not follow a defined pattern. Clogging seems to occur randomly and abruptly. Sometimes the flow rate exceeded the nominal value (maximum relative flow rate of 182%) and other times it was lower than the nominal value (minimum relative flow rate of 0%). Dinâmica da vazão de gotejadores autocompensantes sob o efeito da obstrução R E S U M OA dinâmica da obstrução de emissores autocompensantes ainda é pouco conhecida, apesar de seu entendimento ser de fundamental importância para o controle da obstrução. O objetivo deste trabalho foi avaliar, em laboratório, o comportamento da vazão de gotejadores autocompensantes sob o efeito da obstrução. Avaliaram-se 8 emissores autocompensantes, modelo Jain J-SC PC-PLUS com vazão nominal de 2,2 L h -1 em ensaios com duração de 8 h d -1 , durante 4 semanas totalizando 160 h. A cada 40 h eram incrementadas a concentração e a granulometria de partículas, sendo adicionados 125 mg L -1 de sólidos, compostos por areia. A vazão dos emissores foi determinada por sistema de medição de massa. Verificou-se que as variações de vazão dos emissores não apresentaram padrão definido, ocorrendo de forma aleatória e em sua maioria de forma brusca, às vezes apresentando vazões superiores à vazão nominal (vazão máxima relativa de 182%); outras vezes, vazões inferiores (vazão mínima relativa de 0%).

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“…Preventive measures such as filtration, injection of chemicals and washing of the lines (Puig-Bargués et al, 2010;Pinto et al, 2011) can be adopted to avoid this problem.…”

Section: Introductionmentioning

confidence: 99%

Flow rate dynamics of pressure-compensating drippers under clogging effect

Pinto

Molle

Alves

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…The precipitation of ions is affected by several factors, although water pH seems to be the most important. When water pH is maintained lower than 7, most clogging problems related to precipitation of ions are mitigated [25]. An adjustment of water pH around 6.5 (+/- 0.5) should therefore be part of the clogging test protocol in order to prevent chemical precipitation during tests.…”

Section: Resultsmentioning

confidence: 99%

Methodology to Evaluate Dripper Sensitivity to Clogging due to Solid Particles: An Assessment

Lavanholi

Oliveira

Camargo

et al. 2018

The Scientific World Journal

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Emitter clogging is a major problem in microirrigation systems, which may result from the isolated or combined effects of physical, chemical, and biological agents. Clogging caused by suspended solid particles is the most common plugging form of emitters. Water quality and emitter geometry are key aspects in clogging processes. Any suitable test procedure to assess the sensitivity of drippers to clogging should take into account the predominant factors that influence clogging and must reproduce the field conditions. This research set out to assess the performance and suitability of a laboratory clogging test procedure in order to validate a methodology and to provide scientific results that may support the standardization of a clogging test method. The evaluated methodology has been used by the IRSTEA laboratory since 1974 (Platform of Research and experiment on Science and Technology for Irrigation - PReSTI, formerly LERMI) and its contents are currently being discussed by the ISO TC23/SC18 committee. The aim is to define a standardized testing protocol to evaluate the sensitivity of emitters to clogging due to solid particles. Replications analyzing the clogging resistance of four models of emitting pipes were carried out in a laboratory. The clogging test procedure enabled an accurate assessment of the combinations of concentration and size of particles that caused clogging in each model of dripper. However, a significant variability in degree of clogging was identified when the results of replications for each model of dripper were compared. Several requirements, concerns, and improvements related to the clogging test protocol were discussed.

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“…It should be pointed out that the prevention of emitter clogging should not be based only on agents of physical nature, but also on the other agents, in combination, because in many cases they occur simultaneously (Lemos Filho et al, 2011;Pinto et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Development of a filtration system with high-frequency flow reversal

Pinto

Alves

Saretta

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe aim of this study was to develop a filtration system with high-frequency flow reversal and minimum requirement of water for cleaning routines. The system was developed in the period from 2011 to 2013 and consists of three screen filters and eleven solenoid valves electronically controlled by a controller that operates based on head loss measurements. The following evaluations were carried out: head loss curve as a function of flow rate; filtrating efficiency as a function of solids concentration, frequency of flow reversal and increment in head loss. The experimental design was completely randomized in a factorial scheme with three replicates and two treatment levels for each factor. The filtration efficiency was equal to 98.6% for particles larger than 50 µm. The minimum volume of water for each cleaning of the filters was 5.39 L. The head loss increment in the filtration system with flow reversal at frequencies of 11.11 and 22.22 mHz was smaller compared with the filtration system without flow reversal. The developed filtration system has potential for filtering low-quality irrigation water, but requires periodic maintenance to clean the filter element.

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Desenvolvimento de um sistema para o controle do pH da água para microirrigação

Cited by 12 publications

References 13 publications

Flow rate dynamics of pressure-compensating drippers under clogging effect

Flow rate dynamics of pressure-compensating drippers under clogging effect

Methodology to Evaluate Dripper Sensitivity to Clogging due to Solid Particles: An Assessment

Development of a filtration system with high-frequency flow reversal

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