This paper presents the results of a recent study that sought to combine anionic starch polymers with anionic PAMs to create synergistic polymer blends with the effectiveness of PAM and the biodegradability and plant-based benefits of starch. This paper evaluated combined anionic starch and PAM (bio-blend) logs for removal of suspended sediment. Based on results of this study, bio-blend logs are effective at decreasing turbidity from suspended soils/ sediments in water. The tested bio-blend logs were comparable to traditional PAM logs in both turbidity removal efficiency (~90+%) and flocculation reaction time (15-60 seconds). Effective dose of PAM and bio-blend logs were comparable, dependent on log formulation, and effective at the manufacturer’s suggested application rate for traditional PAM logs (1-5 mg/L). Bio-blend logs present an effective, new water treatment tool with increased biodegradability, sustainable sourcing (plants), and potentially reduced cost as PAM prices are subject to oil and gas availability and fluctuations. Bio-blend log also have the potential to expand flocculant use to new projects and regions that are currently resistant to use of synthetic polymers.
Learning Objectives:
Differentiate between types of polymers that are available for stormwater and erosion control
Understand what biopolymers are and how they've been combined with existing flocculants (anionic PAMs) to remove suspended sediments and treat stormwater
Recognize the implications of biopolymer/ PAM blends for the stormwater and erosion control industry in terms of effectiveness, sustainability, and future use
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