Nitrate and Ammonia in Solar Factory Wastewater: Nutrient Pollution

… more less Nitrate and ammonia in solar factory wastewater come from two common steps. Acid texturing with HF and nitric acid (HNO3) leaves nitrate in the rinse water. PECVD silicon nitride uses ammonia (NH3) gas, and some of it ends up in scrubber water. Nitrogen in these forms is a nutrient. In a river or lake it feeds algae, which bloom and then rot. The rotting uses up the oxygen in the water, and fish die. This is called eutrophication. Ammonia is also directly toxic to fish at low levels, and nitrate in drinking water is a health concern for babies. Lime does not remove either one, so plants need other steps. For ammonia, raising the pH turns it into a gas that can be stripped out with air and captured. For nitrate, bacteria in a tank use it in place of oxygen and turn it into harmless nitrogen gas (N2). This is called denitrification. The trade-off is that these bacteria need food and time, and a shift to alkaline texturing cuts the nitrate at its source. After this Concept you can name where nitrogen enters solar factory wastewater and explain how it is removed before release.