Adsorption Study of Lead by Ascophyllum Nodosum Using a Factorial Experimental Design

Treatment of metal-contaminated wastewater: A comparison of low-cost biosorbents

“…Ascophyllum nodosum is considered an effective seaweed for metal adsorption (Romera et al, 2006) and macroscopically produces biosorbent particles, conferring on it a better metal-binding capacity than most organic or inorganic adsorbents (Freitas et al, 2006). Seaweed is reportedly rich in three main polysaccharides e laminaran, fucoidin and alginate, which are rich in anionic carboxylate and sulphate ready for binding at neutral pH (Alluri et al, 2007).…”

Effects and Mechanisms of Microbial Remediation of Heavy Metals in Soil: A Critical Review

“…Heavy metal ions bind to the surface of the cell not only by electrostatic interaction and complexation but also by ion exchange to the cell surface; for example, the non-living brown algae (Ascophyllum nodosum) exchanges the original cell wall adsorption of K + , Ca 2+ , and Mg 2+ to adsorb Co 2+ (Figure 1, [40]). Brady and Duncan [22] showed that yeast releases approximately 70% of K + rapidly and 60% of Mg 2+ slowly in the process of adsorbing Cu 2+ .…”

“…However, the intake of essential nutrients can reduce the ability of a cell to absorb heavy metal ions. [5] (+) Both soil and metal can be recycled [5] (+) Fine-grained soil may be treated [16] (-) Inconvenient (need large equipment) [16] (-) High cost (use of large equipment and chemical agents) [5] (-) Treatment of soil or sludges rich in metal can be difficult [5] Soil flushing Direct injection of a leaching solution Large area (a large volume of soil) (+) In situ [15] (+) Less disruption to the environment [27] (+) Reduces worker exposure to hazardous materials [27] (-) Efficiencies depend on other factors (nature of soil contaminants) [27] Engineering management Change soil Small area (a small volume of soil) of heavily polluted soil (+) Thorough [28] (+) Stable [28] (-) Implementation requires substantial engineering [29] (-) High investment cost [29] (-) Destroys the soil structure, reducing soil fertility [29] (-) Pollution in removed soil is still problematic [30] Chemical repair Add chemical modifier Wide range of applications (+) In situ [31] (+) Easy [31] (-) Temporary repair measure: The heavy metal remains in soil (i.e., elemental heavy metals are chemically bonded) and is easily re-activated [28] Phytoremediation Introduce plant life Wide range of applications (especially suitable for mining reclamation) (+) Low cost [32] (+) Protects topsoil [32] (+) Reduces soil erosion [30] (+) Generates less waste [32] (+) Recovers heavy metal [32] (-) Long repair cycle [33] (-) The percentage of the extraction could be changed from the concentration in the soil [32] Heavy metal ions bind to the surface of the cell not only by electrostatic interaction and complexation but also by ion exchange to the cell surface; for example, the non-living brown algae (Ascophyllum nodosum) exchanges the original cell wall adsorption of K + , Ca 2+ and Mg 2+ to adsorb Co 2+ (Figure 1, [40]). Brady and Duncan [22] showed that yeast releases approximately 70% ...…”