Polyaluminum chloride is a chemical agent widely used in water treatment, which can effectively remove pollutants such as suspended solids, organic matter and heavy metal ions in water through adsorption and precipitation. However, in the process of using polyaluminium chloride, there are times when the total phosphorus is exceeded, which can adversely affect the water quality. So, what is the reason for the excessive total phosphorus in the use of polyaluminum chloride?
First of all, we need to understand how polyaluminum chloride works. Polyaluminium chloride forms positively charged colloidal particles in water, which are able to adsorb negatively charged contaminants to form larger particles and settle down. However, when the phosphorus content in the water is too high, the phosphorus ions will compete with the aluminum ions in the polyaluminium chloride for adsorption, resulting in the reduction of the phosphorus removal effect of the polyaluminium chloride, so that the total phosphorus exceeds the standard.
Secondly, the dosage of polyaluminum chloride is also an important factor affecting the total phosphorus exceeding the standard. If the dosage is insufficient, polyaluminum chloride cannot give full play to its adsorption and precipitation effects, resulting in the phosphorus in the water cannot be effectively removed. However, too much dosage will make the concentration of aluminum ions in the water too high, and compete with phosphorus ions for adsorption, which will also lead to excessive total phosphorus.
In addition, changes in water quality will also affect the phosphorus removal effect of polyaluminium chloride. For example, when the pH value in the water is too high or too low, it will affect the formation and stability of colloidal particles of polyaluminum chloride, thus affecting its phosphorus removal effect. At the same time, other pollutants in water, such as organic matter and ammonia nitrogen, may also compete with phosphorus ions for adsorption, interfering with the phosphorus removal of polyaluminum chloride.
For these reasons, there are a few things we can do to avoid total phosphorus exceedance. First of all, we can reasonably adjust the dosage of polyaluminum chloride according to the water quality to ensure that it can give full play to the phosphorus removal effect. Secondly, we can improve the water quality by adjusting the pH value of the water quality and increasing the pretreatment to improve the phosphorus removal effect of polyaluminum chloride. In addition, we can also consider using other phosphorus removers or a combination of multiple phosphorus removers to improve the phosphorus removal effect and avoid total phosphorus exceedance.
In conclusion, there are many reasons for the excessive total phosphorus in the use of polyaluminum chloride, including water quality changes, insufficient or excessive dosage, and competitive adsorption. In order to avoid excessive total phosphorus, we need to adjust the dosage of polyaluminium chloride, improve water quality, and consider other phosphorus removal measures. Only in this way can we ensure that polyaluminium chloride has the best phosphorus removal effect in water treatment, so as to ensure the safety and stability of water quality.
The above is an analysis of the reasons for the excessive total phosphorus in the use of polyaluminum chloride. I hope it helps. At the same time, we should also recognize that water treatment is a complex and delicate process, which requires us to continuously learn and explore new technologies and methods to better protect our water resources and environment.