Final answer:
Coagulation is an example of a chemical treatment of liquid waste, where chemicals are added to water to neutralize charged particles and form floc.
Step-by-step explanation:
An example of a chemical treatment of liquid waste is coagulation. This process involves the addition of chemicals with a positive charge to the water, which then bind with negatively charged dirt and other dissolved particles, forming larger particles known as floc. This is often the first step in water treatment and helps to clear the water of contaminants. Meanwhile, anaerobic digestion is a biological process that treats sewage sludge, which is a solid waste, in the absence of oxygen to reduce its volume and potential for disease, often producing methane gas. Incineration involves burning of the waste, and sedimentation is a physical process where solids settle to the bottom.