Automação e monitoramento de reatores de bateladas sequenciais para tratamento de águas residuárias.

Abstract

Nowadays, due to population growth and increased discharges of wastewater, studies are being developed in order to optimize existing sewage treatment methods. Among these, it is highlighted the system of sequencing batch - RBS having implementation flexibility and efficiency in treatment. The RBS treatment process is performed in reactors with a defined processing steps, which are periodically executed cyclically. The advent of microprocessors and computers contributed to the automation of the treatment processes and in reducing energy consumption. In this work, it is presented the automation and monitoring of sequencing batch reactors for wastewater treatment. This system is capable of measuring and analyzing the amount of oxygen dissolved, the sewage level and the temperature in the reactor. It is also able to add and monitor the periods of each treatment phase. The embedded system uses the PIC 18F4550 microcontroller, a XBee wireless transceiver, the HC-SR04 transducer, YSI 5739 OD and temperature sensor. The data measured in the reactor are transferred via RF to a personal computer using the ZigBee protocol, in this computer it is installed the software coded in JAVA, whose purpose is to store and display the data graphically to users of the computer system. The developed system was characterized and validated in the laboratory of wastewater treatment of UEPB. In the validation process, the data measured by the sensors in the embedded system were compared with actual equipment to verify the consistency of the data, which showed small percentage deviations. The automation system and monitoring of wastewater proved satisfactory treatment with 92% percentage in each batch.