As is well known, it is difficult to treat industrial wastewater containing phosphorus, and special chemicals are required for treatment. The common phosphorus removal agents in wastewater include aluminum salts and iron salts, which are also known as polymeric ferric sulfate and polymeric aluminum chloride products.
What are the hazards of phosphorus in wastewater? Phosphorus containing wastewater can promote the increase of organic matter. If not treated and discharged directly, it can cause serious pollution of river water, thereby affecting human health. Therefore, chemical agents can be used to chemically react and precipitate phosphorus in wastewater during phosphorus removal, thereby removing phosphorus from wastewater and achieving the goal of wastewater purification. The use of biological phosphorus removal can also remove 70% of the phosphorus in wastewater, which can meet basic discharge standards. However, a more suitable treatment method is to use polymeric ferric sulfate products for phosphorus removal. This is a high molecular weight flocculant with good coagulation effect and fast settling speed, which can reduce the phosphorus content in sewage and also reduce the input of phosphorus. Relatively speaking, using it for phosphorus removal is more economical.
Although polymeric ferric sulfate has a good phosphorus removal effect, attention should also be paid to the dosage. If the dosage is too high, it will directly affect the sewage treatment effect. Excessive dosage can lead to high sludge production and the formation of more sludge. Excessive simultaneous addition can cause the water to turn yellow, as commonly used phosphorus removal agents belong to iron salt phosphorus removal agents. Excessive addition can lead to excessive iron and aluminum ions in the water, which can cause the water to turn yellow. Another issue is the decrease in pH value. Phosphorus removal agents are generally weakly acidic polymer agents. Increasing the amount of acidic agents added during the phosphorus removal process can enhance the overall acidity of the water, leading to a decrease in pH value. An excessive amount of phosphorus removal agent added later will also increase the difficulty of sludge treatment. When the amount of phosphorus removal agent added is too large, it will increase the amount of sludge and also increase the amount of metal salts and inorganic substances in the sludge, which increases the difficulty of sludge treatment.
Having said so much, I believe everyone has gained a general understanding of the hazards of excessive use of polymeric ferric sulfate. Before using phosphorus removal agents, it is necessary to conduct experiments to obtain a more appropriate dosage. And once the water quality changes, it is necessary to conduct experiments again to determine the optimal dosage, which is also a way to avoid excessive dosage affecting the water treatment effect.
