Regardless of the objective of harvesting process, growth in dilute suspension (0.02–0.05% dry solids), small cell size (<30 μm), negligible density difference of microalgal cells to their culture medium, negatively charged surface (zeta potential) and their high growth rates which needs frequent harvesting compared to land crops make ...
However, if the surface porosity is low, such filters can react sensitive on pore narrowing with increasing membrane resistance. In dependence on the pore size and the size of foulants, small-pore membranes (in the range of ultrafiltration application) may be even less affected by fouling due to steric exclusion for pore narrowing or pore ...
harvesting is an effective water conservation tool because it provides "free" water ... Rainwater "runoff" refers to rainwater that flows off a surface. If the surface is. impermeable, runoff occurs immediately. If the surface is permeable, runoff will ... it is best to select plants with low …
Microalgae harvesting by air flotation is a promising technology for large-scale production of biofuel, feed and nutraceuticals from algae. With an adherence-to-hydrocarbon method and two different types of flotation cells (mechanically agitated cell and Jameson cell), microalgal surface hydrophobicity and bubble size were identified to be critical for effective froth flotation of microalgae.
The process is known by several names including rainwater harvesting, r ainwater collection and rainwater catchment. A rainwater harvesting system comprises several steps. The first step is called catchment. Catchment refers to the process of collecting rainwater from a surface. The catchment is usually a roof or any other surface.
Among these approaches, flotation is known as a more effective and economic way to harvest microalgae by taking advantage of their natural characteristics of relatively low density and self-float . For flotation success, generally, the bubbles are negatively charged with large size and hydrophobic (HPO) surface.
Figure 4.10: The rate of algal biomass accumulation floated to the surface as a result of the combined harvest efficiency of EC/DAF .....54 Figure 4.11: A breakdown of the total harvesting energy as a result of applied amperage
Effective harvesting of the microalgae Chlorella protothecoides via bioflocculation with cationic starch. ... different mechanisms for algal flocculation based on protonation of the negatively charged carboxylate ions from cell surface at low pH leading to reduction of the surface charge and cell flocculation. The different trends observed with ...
Harvesting is an important step in microalgae cultivation which accounts for approximately 20%–30% of the total production cost (Grima et al., 2003). Determination of effective and economic harvesting methods is necessary for high-efficiency bioethanol production at low cost (Bibi et al., 2017). Microalgae that have high dry weight should be ...
Hydrophobic surface with low CAH, denoted as PDMS-modified surface, was prepared on the polished front side of the plasma-cleaned silicon wafer following a literature method. 18 Briefly, an aliquot of 2.85 mL DMS, 31.80 mL isopropanol, and 135 μL sulfuric acid were mixed together gently, and the mixture solution was let to sit still for 30 min ...
effective rainwater harvesting practices. In addition, researchers from universities and non-government organizations, as well as industry consultants, have published papers and articles addressing a broad range of topics related to the installation, maintenance, costs, and performance of harvest …
In summary, the low wettability is generally desirable for fog harvesting, as it is beneficial to the effective water removal from the surface. But, for dew harvesting, the optimal surface needs ...
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