pH control of hydrofluoric acid wastewater
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How can the pH of HF-containing wastewater in the photovoltaic industry be automatically controlled? What if it’s inaccurate when using an antimony electrode? Glass electrodes are prone to corrosion.
It should be the polysilicon industry; our wastewater from previous production contained hydrofluoric acid. For material selection, you can simply discuss the composition of the water with the manufacturer to make the right choice
In the first reaction tank, we have NAOH (liquid alkali) and calcium hydroxide (mortar); generally, calcium hydroxide is used, and NAOH is added when the pH is too low.