Question

The chemical most commonly used to increase speed of sedimentation of sewage is

Answer 1

Answer:

chemical

Sedimentation | SSWM - special chemicals or some natural coagulants can accelerate sedimentation. Three common chemicals used are aluminium sulphate, polyaluminium chloride (also known as PAC or liquid alum) and ferric sulphate.

Answer 2

Answer:alum

Explanation:

The alum has ion which are opposite in charge in comparison with the mud particles. They neutralise them, making them heavy. This helps the mud particles to sediment down.