The Role of Water Treatment Agents in Desulfurization Wastewater

The role of water treatment agents in desulfurization wastewater

The role of water treatment agents in desulfurization wastewater is very extensive, and we mainly use the flocculation and of water treatment agents. Let's first introduce the desulfurization wastewater simply:

Desulfurization wastewater mainly comes from wet desulfurization of flue gas. It is to ensure that the slurry circulating environment in the desulfurization unit maintains a benign cycle, to ensure that the chlorine concentration exceeds the established, and also to ensure the quality of gypsum.

Desulfurization wastewater shows acidity, its PH generally hovers between 4-6, and SS content is very high. The main substances in the wastewater are dust and some substances produced during the desulfurization process. This kind of substance is relatively rich in variety mostly belonging to heavy metal ions. It usually contains SS, PH, heavy metals and fluoride.

So let's talk about where the water treatment agent is added:We mainly add it in the three-way box because the three-way box is divided into: pH adjustment tank, settling tank, flocculation tank.

1 pH adjustment tank dosing: Add lime slurry Ca(OH)2 to adjust the pH value when the desulfurization wastewater enters the pH adjustment tank. The pH of the wastewater entering the pH adjustment tank is generally around 5.5. We can raise its pH to above 9.0 here to improve the effect of the water agent in the following wastewater tank.

2. Settling tank dosing: When the desulfurization wastewater enters the settling tank, add organic sulfide. heavy metal ions in the wastewater form heavy metal precipitation under the action of Ca(OH)2 and organic sulfide.

3. Flocculation tank dosing: use cationic high molecular weight water treatment agents as coagulants, which can make the hydroxide and sulfide react to produce flocculation, improve the floulation speed, so that it quickly precipitates, and the SS in the water is also reduced.