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Green Algae

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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
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Extracellular organic matter (EOM) distribution characteristic in algae electro-dewatering process.

Bingdi Cao1, Yusong Zhang2, Yu Shi3

  • 1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

Journal of Environmental Management
|April 11, 2020
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Optimizing algae dewatering involves adjusting voltage and ionic strength. While higher levels improve dewatering, excessive ionic strength reduces effectiveness, impacting extracellular organic matter release.

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Area of Science:

  • Environmental Science
  • Biotechnology

Background:

  • Algae biomass processing requires efficient dewatering methods.
  • Understanding extracellular organic matter (EOM) behavior during dewatering is crucial for resource recovery and wastewater treatment.

Purpose of the Study:

  • To investigate the impact of operating conditions on algae electro-osmotic dewatering.
  • To analyze the regionalization and dissolution of extracellular organic matter (EOM) during the process.

Main Methods:

  • Electro-osmotic dewatering experiments were conducted.
  • Variations in voltage, ionic strength, and mechanical pressure were applied.
  • Dissolved organic materials (DOM) in filtrate were quantified.

Main Results:

  • Algae dewatering efficiency improved with increased voltage and ionic strength, up to a point.
  • Optimal ionic strength was found to be below 0.006gNaCl/gTSS; higher concentrations hindered dewatering.
  • Increased voltage and ionic strength led to greater EOM dissolution, evidenced by higher DOM in filtrate.
  • Mechanical pressure showed a non-linear effect on electro-osmosis, initially increasing then decreasing the effect.
  • Anodic oxidation contributed to the decomposition of high-molecular-weight substances.

Conclusions:

  • Operating conditions significantly influence algae electro-osmotic dewatering and EOM release.
  • Careful control of ionic strength is necessary to maximize dewatering efficiency.
  • The study provides insights into optimizing algae dewatering for potential resource recovery and wastewater treatment applications.