Desenvolvimento de sistema de automação de lavagem de filtros para eta por dupla filtração modificada

Abstract

Often, because they do not have a reliable water supply system, the population of rural small towns find it very difficult to obtain water within the quality standards required by MS Ordinance No. 2914 of 2011. For the success in obtaining potable water In water treatment plant (ETA) two factors are determinant: the design of the treatment plant and its operation. In this way, the present work intends to act in these two aspects. Firstly, with regard to the project, that is, to the ETA technology, a low-cost automated plant was developed that enables the study of the performance of a modified double filtration pilot station. With regard to operationalization, the developed system assists the operator, a professional usually scarce in rural locations, in the washing of the filtering units. The automated system developed required little operator action compared to the traditional pilot ETA operation in question. This is because the procedure of washing the filters, activating the pump for washing and shutting off the pumps of raw water and dosing of chemicals is autonomous. Because it is relatively cheaper to monitor turbidity, the system uses as a parameter to define the filter wash, a pressure screen that monitors the pressure drop in the filter units independently. In order to carry out the tests, the plant's operating logic was initially developed, which subsidized the creation of operational flow diagrams, PLC programming and equipment selection and assembly. Then, based on the literature, the differential pressure setpoints were implemented in the PLC and the load loss in the line was simulated in order to evaluate the performance of the system. The system behaved as expected, ie washing the filter units autonomously. It is expected that the developed system will be able to provide, in the first moment, the support for the study of the performance of the modified double filtration ETA. In future work, it is hoped that the automated ETA will provide data to correlate the loss of load and turbidity, evaluate the performance of the pressure mesh in comparison with the turbidity mesh, facilitate the operation of the ETA and, finally , Can guarantee the good quality of water treatment at a practicable cost.