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Related Concept Videos

Biodeterioration01:28

Biodeterioration

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Biodeterioration refers to the unwanted alteration of materials caused by microorganisms—especially fungi—which damage both organic substrates (paper, wood, textiles) and inorganic ones (stone, plaster, glass). Unlike abiotic decay, biodeterioration results from biological activity that produces physical disruption and chemical degradation.Physical deterioration occurs as fungal hyphae penetrate pores, cracks, and surface irregularities. Hyphal turgor pressure, thigmotropic growth...
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Bioplastics01:27

Bioplastics

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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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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
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Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process.

Lu Cai1, Thomas Krafft2, Tong-Bin Chen3

  • 1Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, China; Faculty of Health, Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands.

Bioresource Technology
|June 5, 2016
PubMed
Summary
This summary is machine-generated.

Biodrying effectively removes water from sewage sludge by utilizing microbial heat. This process alters sludge structure and degrades extracellular polymeric substances (EPS), with the thermophilic phase releasing the most free water.

Keywords:
BiodryingExtracellular polymeric substancesFree waterMorphological changeSewage sludge

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Waste Management

Background:

  • Biodrying is an economical and energy-efficient method for biomass waste treatment.
  • Sewage sludge dewatering presents technical challenges, hindering efficient biodrying.
  • Understanding sludge alteration during water removal is crucial for optimizing biodrying.

Purpose of the Study:

  • To investigate sludge alteration during biodrying, focusing on structural changes, extracellular polymeric substances (EPS), and free water release.
  • To evaluate the effectiveness of auto-feedback control technology in sludge biodrying.
  • To identify the key phase responsible for maximal free water release.

Main Methods:

  • Auto-feedback control technology for biodrying.
  • Scanning electron microscopy (SEM) for morphological analysis.
  • Three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy for EPS analysis.
  • Time domain reflectometry (TDR) for free water assessment.

Main Results:

  • A 62% water removal rate was achieved during the initial thermophilic phase over 20 days.
  • Biodrying induced a hollow and stratified sludge structure.
  • Significant degradation of aromatic proteins and soluble microbial byproducts within EPS was observed.
  • The thermophilic phase yielded the highest rate of free water release.

Conclusions:

  • Biodrying is a viable method for sewage sludge dewatering, leading to significant water removal.
  • The process induces notable structural modifications and EPS degradation in sludge.
  • The thermophilic phase is critical for maximizing free water release during sludge biodrying.