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Automatic Control Design for Cost-effective Wastewater Treatment

Seno D. Panjaitan, Berlian Sitorus


A wastewater treatment system equipped with process controller (microcontroller) has been developed in this research in a lab-scale. The system combined anaerobic digestion, aerobic and filtration process. Its logic control algorithm was designed by using Signal Interpreted Petri Net. In formal analysis result, the logic control satisfied the following properties: conflict free, termination, noncontradictory outputs, live, deadlock-free, and reversible. Moreover, the design evaluation gave the average value of transparency metrics 0.989 close to one as the best value. The system was operated automatically and its performance was evaluated by pollutant removal efficiency. The highest removal efficiencies were obtained when each anaerobic and aerobic treatment were performed for three days respectively and followed by filtration. Within this condition, the system obtained average removal efficiency 91% of Chemical Oxygen Demand, 95% of Total Suspended Solids and 97% of Volatile Suspended Solids. Regarding electricity consumption, the system needed only 1,857.6 Watt-hour for a batch treatment process.

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