Abstract
Recovery of resources from wastewater, e.g., bioplastics, cellulose, metals, and phosphorus, is one of the most important research objectives in wastewater treatment. Recently, the recovery of polymeric substances from excess sludge is gaining significant research interest in future wastewater treatment technologies, which can not only enhance the dewatering performance of sludge but also promote sludge reduction. Herein, extracellular polymeric substance (EPS) and typical polysaccharide alginate as recycled materials are discussed. First, membrane recovery of alginate was discussed, including ultrafiltration (UF) concentration of sodium alginate solution, filtration coefficient and recovery rate of alginate, forward osmosis recovery with useful reverse solute diffusion, and properties of recycled materials. Second, membrane recovery and properties of EPSs were described through the role of calcium ion, microfiltration separation of polysaccharides and proteins in EPS, and removal of heavy metal ion using UF with recovery of EPSs. Finally, the surfactant-enhanced ultrasonic extraction of PSs was proposed, in which the effect of surfactant on extraction efficiency, extraction mechanisms, characteristics of PSs, and adsorption properties of lead ion were shown.
Da-Qi Cao, Doctor of Engineering (Nagoya University), Associate Professor, Research interest: Recovery of resources from wastewater, Removal of trace organic contaminants and heavy metal ions in wastewater, Membrane separation, Preparation of novel membrane.
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Acknowledgments
This study was partially supported by the Bei**g Nova Program (Z211100002121154), the Bei**g Natural Science Foundation (8222043), the Project of Cultivation for young top-motch Talents of Bei**g Municipal Institutions (BPHR202203083), and Bei**g Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center. The funding agencies did not influence the study design, data collection, analysis and interpretation, report writing, or the decision to submit this article for publication.
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Cao, DQ. (2023). Polymeric Substances Recycled from Excess Sludge in Wastewater Treatment Plant. In: Ismail, H., S. M., S., R. A., I. (eds) Recycled Polymer Blends and Composites. Springer, Cham. https://doi.org/10.1007/978-3-031-37046-5_5
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