Research on a new cationic polyacrylamide (CPAM) with a cationic microblock structure and its enhanced effect on sludge condition and dewatering

Chen, Yuning; Li, Xuhao; Wang, Zizeng; Feng, Li; Xie, Jiehong; Lin, Zeluan; Xu, Zhengguang; Liu, Bingzhi; Li, Xiang; Zheng, Huaili

doi:10.1007/s11356-021-14325-3

Cited by 10 publications

(4 citation statements)

References 74 publications

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“…Otherwise, synthetic polymers, namely PAMs, have been commonly used in sludge conditioning to enhance its dewatering [44,45]. On account of their long chain and high charge density, polyacrylamide-based flocculants bridge the small solids together to form large and settleable flocs.…”

Section: Chemical Flocculants For Improving Sludge Dewatering: Effici...mentioning

confidence: 99%

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Hadj Mansour,

Othmani,

Ben Rebah

et al. 2023

Water

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Due its high water content, sewage sludge dewatering is not just a simple operation; rather, it is a challenging process and a costly management task. Its final handling is usually preceded by several dewatering steps, and among them is the conditioning process known as the flocculation stage, which is carried out using synthetic chemical reagents. Despite the abilities of these additives to reduce sludge volume and extract its bound waters, they are suspected to cause serious environmental and health threats. Their substitution by natural and efficient additives originating from plant extracts could thus be a safe and an eco-friendly alternative, overcoming ecosystem damages. It is within this context that the present review paper critically investigates the efficacy and feasibility of plant-based flocculants, aiming to enhance sludge dewatering and dispense with environmental burdens. To do so, the types of the conventional chemical flocculants, their drawbacks, and their impacts on the ecosystem and human health were addressed. In parallel, the potential dewatering efficiency of plant extracts toward sludge treatment was compiled, and their mechanistic dewatering paths performances were thoroughly discussed. The challenges associated with dewatered sludge and its potential exploitation were also highlighted to motivate scientific communities to further explore green resources for sludge processing. It is suggested that green resources such as Moringa, Cactus, Aloe, and Okra could be used as green flocculants instead of chemical ones, which would provide a promising and eco-sustainable approach to sludge dewatering and might represent a path towards an environmentally friendly and clean technology.

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Section: Chemical Flocculants For Improving Sludge Dewatering: Effici...mentioning

confidence: 99%

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Hadj Mansour,

Othmani,

Ben Rebah

et al. 2023

Water

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“…Cationic polyacrylamide (CPAM) is a linear organic polymer that is often used as a flocculant in wastewater treatment [ 17 ]. The adsorbent materials prepared by modifying diatomite with CPAM can better adsorb dye molecules in wastewater through physical-chemical interaction and bridging action [ 18 ]. Sodium alginate (SA) is a natural polysaccharide polymer with good biocompatibility, non-toxicity and degradability.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Superstrong Adsorption of a Novel La(Ⅲ)-Crosslinked Alginate/Modified Diatomite Macroparticle Composite for Anionic Dyes Removal from Aqueous Solutions

Zhao

2022

Gels

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In order to solve the problem of dye pollution of the water environment, a green macroparticle composite (CPAM-Dia/SA-La) as a bioadsorbent was prepared through a sodium alginate (SA) reaction with a polyacrylamide (CPAM)-modified diatomite (Dia) and further La(III) ion crosslinking polymerization, and characterized by various analytical methods. The important preparation and adsorption conditions of the composite were explored by the adsorption of Acid blue 113 (AB 113) and Congo red (CR) dyes. The dye adsorption efficiency was evaluated. The results show that CPAM-Dia/SA-La composite prepared under the optimized conditions displays superstrong adsorption capacities of 2907 and 1578 mg/g for AB 113 and CR and almost 100% removal efficiency within 60 min adsorption time at pH 2.0 and 298 K, and they decrease slightly with the pH increase to 10. The fitting of equilibrium data to the Langmuir model is the best and the adsorption kinetic processes can be expressed by the Pseudo-second-order kinetic model. The adsorption processes are both spontaneous and exothermic. The analysis results of FT−IR and XPS revealed that the superstrong adsorption of CPAM-Dia/SA-La for dyes. The composite adsorbed by the dye can be recycled. CPAM-Dia/SA-La is a promising biosorbent for dye wastewater treatment.

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“…[2] In synthetic systems, combining free-radical, controlled radical, condensation, and ring-opening (co)polymerization with templates produces, for example, cyclic polymers, (semi-)ladder polymers, and one-pot blocky macromolecules that cannot be attained by traditional means. [1,[3][4][5][6][7][8][9][10][11][12] Recruitment by and pre-organization of monomers and growing chains on the template can be achieved in many ways, e.g., by hydrogen bonds, electrostatic forces, or covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

“…Arguably the most significant example of these templated polymerizations are the transcription and translation steps involved in the fabrication of proteins as prescribed by the DNA code and enabled by RNA intermediates [2] . In synthetic systems, combining free‐radical, controlled radical, condensation, and ring‐opening (co)polymerization with templates produces, for example, cyclic polymers, (semi‐)ladder polymers, and one‐pot blocky macromolecules that cannot be attained by traditional means [1, 3–12] . Recruitment by and pre‐organization of monomers and growing chains on the template can be achieved in many ways, e.g., by hydrogen bonds, electrostatic forces, or covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

Switchable Electrostatically Templated Polymerization

Magana

Sobotta

et al. 2022

Angewandte Chemie

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We report a switchable, templated polymerization system where the strength of the templating effect can be modulated by solution pH and/or ionic strength. The responsiveness to these cues is incorporated through a dendritic polyamidoamine‐based template of which the charge density depends on pH. The dendrimers act as a template for the polymerization of an oppositely charged monomer, namely sodium styrene sulfonate. We show that the rate of polymerization and maximum achievable monomer conversion are directly related to the charge density of the template, and hence the environmental pH. The polymerization could effectively be switched “ON” and “OFF” on demand, by cycling between acidic and alkaline reaction environments. These findings break ground for a novel concept, namely harnessing co‐assembly of a template and growing polymer chains with tunable association strength to create and control coupled polymerization and self‐assembly pathways of (charged) macromolecular building blocks.

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Research on a new cationic polyacrylamide (CPAM) with a cationic microblock structure and its enhanced effect on sludge condition and dewatering

Cited by 10 publications

References 74 publications

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Could Plant-Based Flocculants Substitute the Conventional Synthetic Chemicals in the Sludge Dewatering Process?

Preparation and Superstrong Adsorption of a Novel La(Ⅲ)-Crosslinked Alginate/Modified Diatomite Macroparticle Composite for Anionic Dyes Removal from Aqueous Solutions

Switchable Electrostatically Templated Polymerization

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