Which Polyacrylamides are used in the thickening process of colliery effluent treatment?

1. INTRODUCTION Polyacrylamides are used in the "thickening" process of colliery effluent treatment. The wastewater contains mainly clay particles, in suspension, which are flocculated using non-ionic and anionic polyacrylamides, which have molar masses in the range of 7-15 million g/mol.

How is non ionic polyacrylamide produced?

Non-ionic polyacrylamide may be produced from its monomer by free radical polymerization using a wide variety of initiation methods.

What are the different types of polyacrylamide adsorption?

In practice, however, this adsorption is often enhanced by using modified (anionic or cationic) forms of polyacrylamide. Polyacrylamide can be classified to three categories: non-ionic, anionic and cationic polyacrylamide. Keywords: Polyacrylamide; non-ionic; anionic; cationic; wastewater treatment. 1. INTRODUCTION

Does anionic polyacrylamide improve flocculation?

In Michaels’ study on the flocculation of clay suspensions by anionic polyacrylamide, the flocculation was found to improve as the molecular weight increased and that a certain degree of hydrolysis (anionic character) gives better flocculation .

What are the three types of polyacrylamide?

Polyacrylamide can be classified to three categories: non-ionic, anionic and cationic polyacrylamide. Keywords: Polyacrylamide; non-ionic; anionic; cationic; wastewater treatment. 1. INTRODUCTION Polyacrylamides are used in the "thickening" process of colliery effluent treatment.

Does non-ionic polyacrylamide improve floc settling time?

Tan et al. have studied the effect of non-ionic polyacrylamide as a coagulant aid on floc settling time for the removal of colouring matters form industrial dye wastewater. Non-ionic polyacrylamide is commonly used as a coagulant aid to improve the coagulation process and subsequently the floc settling velocity.