Why are non ionic and anionic polyacrylamide based flocculant chains used in tailings treatment?

Non-ionic and anionic polyacrylamide (PAM)-based flocculant chains are commonly employed in a vast majority of tailings treatment operations and several studies have been conducted on degradation of PAMs due to various factors such as pH, light and temperature , microbial degradation and chemical degradation .

Does manganese peroxidase degrade anionic polyacrylamide (HPAM)?

Manganese peroxidase (Mn P) is capable of effectively degrading anionic polyacrylamide (HPAM). However, the interaction of Mn P with HPAM at molecular level is lacking until now. Here, the HPAM model compounds, HPAM-2, HPAM-3, HPAM-4, and HPAM-5, were selected to reveal their binding mechanisms with Mn P.

Does ultrasonication affect the degradation of polyacrylamide-based flocculants?

The effect of ultrasonication, screening and shearing on five polyacrylamide-based flocculants of similar molecular weight but different degrees of anionicity (DA) was studied through measurement of intrinsic viscosity ( [η]) and size exclusion chromatography (SEC) to investigate the influence of DA on the degradation of polymers.

What causes environmental degradation of polyacrylamides?

Environmental degradation of polyacrylamides. 1. effects of artificial environmental conditions: temperature, light, and pH Ecotoxicol. Environ. Saf., 35 (2) (1996), pp. 121 – 135, 10.1006/eesa.1996.0091 Environ. Technol., 33 (9) (2012), pp. 1049 – 1054, 10.1080/09593330.2011.606846 SPE Reserv. Evaluat.

Does sulfonated polyacrylamide degrade at a higher temperature?

The graphs below also suggest that sulfonated polyacrylamide (SPAM) (Figs. S3 (c) and (d)) degrades at a higher temperature than partially hydrolyzed polyacrylamide (HPAM) and associative polyacrylamide (APAM), indicating that SPAM has better thermal stability than others (Zhang et al., 2019). Table 4. Thermal degradation at each temperature state.

What are the effects of anionic polyacrylamide (HPAM) in coal flotation?

The anionic polyacrylamide (HPAM) is often used in flotation of fine coal . With the extensive use of HPAM, its accumulation in circle water is huge . This will lower the adsorption of coal slurry on flotation agents and was detrimental to the flotation. Besides, the flow of sewage containing HPAM threaten people and environment [4, 5].