Coagulant process heavy metal capture agent

Coagulant process

Coagulation includes two processes: coagulation and flocculation. The agents that can cause coagulation and flocculation are collectively referred to as coagulants.

Coagulation mechanism:

1. Double layer compression mechanism: When electrolyte is added to the solution to increase the ion concentration in the solution, the thickness of the diffusion layer will decrease. When two colloidal particles approach each other, due to the decrease in the thickness of the diffusion layer and the decrease in the zeta potential, their repulsive force decreases, and the colloidal particles can quickly coalesce.

2. The mechanism of adsorption electric neutralization refers to the strong adsorption effect of the surface of colloidal particles on the parts with different numbered charges. Due to this adsorption effect neutralizing some of its charges and reducing electrostatic repulsion, it is easy to approach other particles and adsorb to each other.

3. The principle of adsorption bridging mainly refers to the mutual adsorption of polymer substances and colloidal particles, but the colloidal particles themselves do not directly contact each other, causing the colloidal particles to aggregate into large flocs.

4. The mechanism of sediment trapping is that when metal salts or metal oxides and hydroxides are used as coagulants, and the dosage is large enough to rapidly form metal oxide or metal carbonate precipitates, the colloidal particles in the water can be captured by these precipitates during their formation. When the precipitate carries a positive charge, the precipitation rate can be accelerated due to the presence of cations in the solution. In addition, the colloidal particles in water can serve as the core for the formation of these metal hydroxide precipitates. Therefore, the amount of coagulant added is inversely proportional to the concentration of the removed substance, that is, the more colloidal particles there are, the less metal coagulant is added.

Coagulant process

The mechanism of action is to neutralize the negative charge on the surface of suspended particles, reduce the repulsion of charges, and make the particles more prone to coalescence; Excessive concentration of coagulants will cause the surface of sediment to adsorb excess iron ions and become positively charged, resulting in the loss of aggregation and sedimentation of iron's multi nuclear hydroxyl bridging ions. This product is mainly used for the purification of drinking water and industrial wastewater, as well as the treatment of special water quality (such as oily wastewater, printing and dyeing wastewater, smelting wastewater, wastewater containing radioactive properties, toxic heavy metals such as Pb and Cr, and wastewater containing F). Coagulants mainly achieve purification effects by compressing the double layer, adsorbing electric neutralization, adsorbing bridging, and capturing sediment nets, etc., to destabilize the fine suspended particles and colloidal ions in edema, aggregate, flocculate, coagulate, and precipitate.

Main purpose:

Can be applied to the treatment of river water, lake water, and groundwater

Can be applied to the treatment of industrial water and industrial recycled water

Can be applied to the treatment of wastewater

Can be applied to the recovery of coal mine flushing wastewater and porcelain industry wastewater.

Can be applied to wrinkle prevention of leather and fabric.

Can be applied to cement solidification and molding casting.

Can be applied to the refining of pharmaceuticals, glycerol, and carbohydrates

Can serve as a good catalyst.

Can be applied to paper bonding.