Abstract
This study proposes a fuzzy control strategy embedded in a Siemens IoT2040 gateway developed for removing inorganic arsenic from synthetic underground water in a treatment plant prototype. The prototype is used to dose a constant flow of Fe(VI) to maintain an oxide-reduction potential to guarantee the oxidation of arsenite into arsenate, while the fuzzy logic embedded in the IoT control manages the addition of Fe(III) to achieve a proper pH adjustment and efficient arsenate removal. The tests used synthetic Bangladesh groundwater enriched with 200 µg/L of arsenite and 200 µg/L of arsenate. The results revealed that the plant prototype yielded an effective treatment of the water. Arsenate was decreased to an average value of 6.66 µg/L and, the arsenite concentration decreased to 1.01 µg/L or less. These values were lower than the limit of 10 µg/L deemed by the World Health Organization as safe for human consumption.
Highlights
Water shortage on the Peruvian coast is a major problem for the 20 million people who live there; they only receive fresh rainwater during the three summer months each year, which is not enough to fill the large reservoirs in the most important cities
As(III) conventional oxidation has been tested with potassium permanganate, sodium hypochlorite, and monochloramine in demineralized water as well in real water [4], less conventional approaches used ferrate(VI) to remove arsenite and arsenate even though it can be done in one step without producing toxic byproducts [5]
The IoT2040 runs the fuzzy logic program developed with the MATLAB development pump, the(pulse-width
Summary
Water shortage on the Peruvian coast is a major problem for the 20 million people who live there; they only receive fresh rainwater during the three summer months each year, which is not enough to fill the large reservoirs in the most important cities. For this reason, it is essential to obtain water from groundwater sources for the rest of the year. As(III) conventional oxidation has been tested with potassium permanganate, sodium hypochlorite, and monochloramine in demineralized water as well in real water [4], less conventional approaches used ferrate(VI) to remove arsenite and arsenate even though it can be done in one step without producing toxic byproducts [5]
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