What is the use of anionic polyacrylamide in water and wastewater treatment?

The main use of anionic polyacrylamides in water and wastewater treatment is as coagulant aid to bridge the coagulated particles formed when an inorganic coagulants such as alum has been used as the primary coagulant. Fig. 2. Hydrolysis of polyacrylamide

What is polyacrylamide used for?

Polyacrylamide and its co-polymers are used as flocculants or coagulants in industrial wastewater treatment .Homo-polymer is used in this application and can be either nonionic, cationic or anionic depending on the types of wastewater needs to be treated. Also polyacrylamide can be prepared either as linear or as cross-linked.

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.

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.

What is non ionic polyacrylamide used for?

Non-ionic polyacrylamide is commonly used as a coagulant aid to improve the coagulation process and subsequently the floc settling velocity. Higher settling velocity is desired so that the size of the settling tank can be reduced. The result shows

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 .