Chemical Additives - NCSU
High wet and dry strength is imparted to cellulose papers regardless of fibre source or degree of purity (i.e. from ground-wood to cotton or alpha pulps). 5. Rapid curing is obtained at pH 4.5-5.5.
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When high quality water is required, for example in high-pressure showers, a further treatment such as ultrafiltration (UF) can be used. On the other hand, the process water in a paper machine system, i.e. the “white water”, can contain a
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polymer network with physically incorporated CNCs.(51-53, 56, 58-60) Alternatively, Zhou et al. used heat treatment to obtain physical polyacrylamide hydrogels, which when filled with CNCs proved to be highly effective for the...
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- What are polyacrylamide based flocculants?
- Polyacrylamide-based flocculants constitute the most important group of water-soluble polymers commercially applied in harvesting freshwater and marine microalgae from their suspensions. This is primarily due to the high reactivity, hydrophilic nature and relatively low costs associated with their monomer acrylamide .
- Are polyacrylamide-based flocculants a viable alternative to physical harvesting methods?
- Compared to traditional physical harvesting methods, coagulation-flocculation techniques using polyacrylamide-based flocculants have garnered attention as promising alternatives due to their high harvesting efficiencies, cost-effectiveness, convenience, and scalability.
- Which polyacrylamide variant has the highest flocculation efficiencies?
- Polyacrylamide variants 71,305 and 71,303 possessing low to medium charge densities and medium to high molecular weights offered the highest flocculation efficiencies of 85.3% and 89.9% at the lowest flocculant doses 3 mg/L and 4 mg/L, respectively.
- Are polyacrylamide flocculants toxic?
- While most polyacrylamide flocculants are stable and non-toxic, some may leave behind acrylamide residues that are anticipated to be neurotoxic, potentially carcinogenic and generally exhibit high toxicity towards aquatic life .
