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Bioplastics01:27

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Biological wastewater treatment relies on the metabolic activity of microorganisms to remove pollutants from sewage. In modern treatment systems, this process is organized into sequential stages that progressively reduce solid material, dissolved organic matter, and microbial contamination. Each stage plays a distinct role in improving water quality and preparing the effluent for safe discharge or reuse.Primary and Secondary TreatmentPrimary treatment is a physical process that removes large...
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Green and Low-cost Production of Thermally Stable and Carboxylated Cellulose Nanocrystals and Nanofibrils Using Highly Recyclable Dicarboxylic Acids
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Construction materials as a waste management solution for cellulose sludge.

R Modolo1, V M Ferreira, L M Machado

  • 1University of Aveiro, Civil Engineering Department/CICECO, Aveiro, Portugal. regina.modolo@ua.pt

Waste Management (New York, N.Y.)
|October 15, 2010
PubMed
Summary

Pulp and paper mills can now recycle effluent sludge into fiber-cement sheets, replacing 25% of virgin fibers. This sustainable waste valorization reduces landfill waste and raw material costs without compromising product quality or environmental safety.

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Pulp and paper mills generate significant effluent treatment sludge, posing a waste management challenge.
  • Sustainable waste valorization and recycling are crucial for environmental protection in the industrial sector.
  • Conventional fiber-cement production relies on virgin long fibers, contributing to resource depletion.

Purpose of the Study:

  • To assess the technical viability of incorporating primary effluent treatment cellulose sludge into fiber-cement roof sheets.
  • To demonstrate waste valorization by utilizing pulp and paper mill sludge as a raw material.
  • To evaluate the environmental and product quality impacts of replacing virgin fibers with sludge.

Main Methods:

  • Incorporation of primary effluent treatment cellulose sludge at 25% replacement of virgin long fibers.
  • Industrial-scale production trials of fiber-cement sheets.
  • Environmental parameter testing: total solids, dissolved salts, chlorides, sulfates, COD, and metals content.
  • Product quality testing: moisture, density, and strength.

Main Results:

  • Successful production of fiber-cement sheets with 25% sludge incorporation was achieved on an industrial scale.
  • Environmental parameters remained within acceptable limits, indicating no negative impact.
  • Final product quality, including strength and density, was comparable to conventional sheets.
  • The process effectively reduces significant amounts of sludge sent to landfills.

Conclusions:

  • Primary effluent treatment cellulose sludge can be technically and viably used to replace virgin long fibers in fiber-cement production.
  • This method offers a sustainable waste management solution for the pulp and paper industry.
  • The process reduces environmental impact, eliminates landfill waste, and lowers production costs.