Anaerobic process can decompose macromolecular organic matter, but polyacrylamide is a polymer. As far as I know, in the anaerobic process, the decomposable macromolecular organic substances are mainly inorganic substances, which are stabilized by microorganisms in the absence of oxygen. Therefore, polyacrylamide can not be decomposed, but can be degraded, provided that metal ions form precipitation with it, and its molecular structure changes and intermolecular breaks due to high-speed rotation; Either the temperature is too high (above 60℃) or it is oxidized and so on.