With the development of economy, people pay more and more attention to environmental problems, and sludge treatment has become a difficult problem for factory sewage treatment. There are many types of metering pump dosing device, sludge dosing device is one of them, let's look at the metering pump dosing device phosphate treatment methods.

1. Phosphate treatment

The method is to add phosphate solution under the condition that the pot water is alkaline, so that the pot water phosphate is kept within a certain concentration range, and the calcium ion in the water reacts with the phosphate to form basic calcium phosphate, a small amount of magnesium ion and the silicate in the pot water to form serpentine. Alkaline calcium phosphate and serpentine are insoluble compounds, dispersed in pot water and soft water slag, easy to discharge with the boiler boiler discharge, will not adhere to the heating surface of the secondary scale.

2. Pan water phosphate "temporary disappearance" phenomenon

In some boilers, when the amount of phosphate is normal, when the boiler operating load increases, the phosphate concentration in the pot water will be significantly reduced, and when the boiler load is reduced or the furnace is stopped, the phosphate concentration in the pot water will increase again, this abnormal water quality phenomenon is called phosphate "temperature". The "disappearance of counterfeiting" phenomenon. The way to prevent this from happening is to perform a low phosphate treatment, a boiler water treatment method that balances phosphates, or use a completely volatile treatment. Isophosphate treatment cannot solve the disappearance of phosphate, but it can prevent alkali corrosion caused by the disappearance of phosphate.

3. Phosphate treatment of other ingredients

The method is to mix the boiler water with trisodium phosphate and sodium hydrogen phosphate, and the no water in the pot is converted to trisodium phosphate and sodium hydroxide, as long as the mole ratio (R) of the sodium ion and phosphate ion of the water in the pot (Na/PO4 is controlled within a certain range, so that the water in the pot has sufficient pH value and a certain concentration). Quantitative PO43- does not contain sodium hydroxide.

When the same amount of phosphate is used, the phosphate is easy to disappear and corrosion. To solve this problem, the balanced phosphate treatment (EPT) method was adopted.