Automação do sistema de dessalinização via osmose inversa da vila de Sucuriju-AP.

Abstract

The Village of Sucuriju is located in the northeasterm of the State of Amapá, on the banks of Sucuriju river, in the Amazon forest. Currently the Village, with approximately 700 habitants, is supplied by rainwater collected in the rainy winter season, from January to April. This water is stored in 1 m3 individual water tanks and in two large communal cisterns with total capacity of approximately 700 m3. The Sucuriju river is saline with an average concentration of 13,800 mg/L, when the maximum value, for the human consumption, allowed by the Brazilian Health department is 1,000 mg/L. The precariousness of rainwater collection and long-term storage, as well as the lack of adequate treatment makes this water inappropriate for the human consumption due to presence of pathogenic microorganisms. During the summer, each person receives a weekly quota of only 20 liters. To solve this problem a reverse osmosis (RO) desalination system was installed. This system is automated and is supplied by electricity generated by a hybrid system comprising photovoltaic panels, wind turbines and a diesel generator. The desalination system was designed to receive the water from the Sucuriju river, that presents an averaged TDS of 13,800 mg/L, a pH value of 7 and a turbidity of 311 NTU, as verified by physico-chemical analysis realized in LABDES. The RO system was projected to have a minimum recovery of 30% and a capacity to produce 2 m3/h of drinking water with a permeate TDS value of 163.6 mg/L and a pH equal to 6.4. The RO system operates 6 hours per day, thus guaranteeing an additional of 20 liters per person per day. The implanted automation allows to monitor and to control all the variables of the process locally or remotely from the supervisory station located in the LABDES by the use of a programmable logical controller.