Coagulation works by the bonding of negatively charged turbidity to which kind of chemical?

Coagulation in water treatment is a process that helps to remove suspended particles, such as turbidity, from water. The performance of this process relies on the electrostatic interactions between particles. Negatively charged particles, such as those that contribute to turbidity, are effectively removed by bonding with positively charged chemicals.

The positively charged chemicals, often referred to as coagulants, neutralize the negative charges on the turbidity particles. This neutralization allows the particles to come closer together, facilitating their aggregation into larger flocs that can be more easily removed from the water through sedimentation or filtration.

In contrast, neutral or negatively charged substances would not effectively attract or bond with negatively charged turbidity particles, and amorphous substances do not play a direct role in the electrostatic dynamics involved in coagulation. Hence, the correct answer highlights the necessity of using positively charged chemicals for effective coagulation to remove turbidity from water.