The main use of polyacrylamide is flocculate  and coagulate the solid in the liquid.So ,the
polyacrylamide can be used to wastewater treatment,paper-making and so on.Most PAM
is used to liquid. The liquid is subcategorized as solution and emulsion polymer. Even
though these products are often called 'polyacrylamide', many are actually copolymers of
 acrylamide and one or more other chemical species, such as an acrylic acid or a salt thereof.
The main consequence of this is to give the 'modified' polymer a particularionic character.

Another common use of polyacrylamide and its derivatives is in subsurface applications
such as Enhanced Oil Recovery. High viscosity aqueous solutions can be generated with
 low concentrations of polyacrylamide polymers, and these can be injected to improve the
 economics of conventional waterflooding.

It has also been advertised as a soil conditioner called Krilium by Monsanto Company in
 the 1950s and today "MP", which is stated to be a "unique formulation of PAM (water-
soluble polyacrylamide)". The anionic form of polyacrylamide is frequently used as a soil
 conditioner on farm land and construction sites for erosion control, in order to protect the
 water quality of nearby rivers and streams.[1]

The polymer is also used to make Gro-Beast toys, which expand when placed in water,
as the Test Tube Aliens.

The ionic form of polyacrylamide has found an important role in the potable water treatment
 industry. Trivalent metal salts like ferric chloride and aluminium chloride are bridged by
 the long polymer chains of polyacrylamide. This results in significant enhancement of the
flocculation rate. This allows water treatment plants to greatly improve the removal of total
organic content (TOC) from raw water.