Non-conventional low-cost adsorbents for dye removal: A review

Application of low-cost adsorbents for dye removal – A review

Adsorption of methylene blue on low-cost adsorbents: A review

Biosorbents for heavy metals removal and their future

Application of chitosan, a natural aminopolysaccharide, for dye removal from aqueous solutions by adsorption processes using batch studies: A review of recent literature

A review of potentially low-cost sorbents for heavy metals

: Heavy metals contamination is an environmental problem at Army installations engaged in firearms training and munitions production. Weathering and corrosion of expended munitions and leaching from wastewater lagoons, landfills and bum pits, has resulted in heavy metals contamination of the soil at these facilities. Transport of metals to the groundwater has been confirmed in some locations, requiring treatment of the groundwater at the site. Certain treatment processes for contaminated soil produce metals laden extracts, which also require treatment before reuse or disposal. Low cost sorbents with a high affinity for metals that can be disposed after use may provide an economic alternative to ion exchange and activated carbon. Metals sorption capacity is reported in the literature for a variety of natural materials and industrial byproducts. This information is useful in identifying potentially useful sorbents, but is limited to the specific conditions studied. Of primary interest are those sorbents with a demonstrated affinity for the metals of interest, that are inexpensive and readily available, and that require no modification prior to use. A field ready sorption technology for treatment of metals-contaminated water and waste streams was the principal objective of this work unit.

Low Cost Sorbents Screening and Engineering Analysis of Zeolite for Treatment of Metals Contaminated Water and Soil Extracts

: The capital and regeneration costs of activated carbon and ion exchange media suggest that better process economics may be achieved with disposable sorbents for the treatment of metals-contaminated water and waste streams. An extensive literature search was conducted to identify potentially inexpensive sorbents that could be disposed, rather than regenerated, after use. The literature indicates that many materials with this potential are readily available, either as process by-products or in their natural form. The most promising sorbents identified in this literature search will be tested at bench scale with synthetic metal solutions.

/pdf/low-cost-sorbents-a-literature-summary-1dj9cdcpla.pdf

Low-Cost Sorbents: A Literature Summary.

Coastal wetlands are experiencing accelerated rates of fragmentation and degradation due to sea-level rise, sediment deficits, subsidence, and salt-water intrusion. This reduces their ability to provide ecosystem benefits, such as wave attenuation, habitat for migratory birds, and a sink for carbon and nitrogen cycles. A deteriorated back barrier wetland in New Jersey, USA was nourished through thin layer placement (TLP) of dredged sediment in 2016. A field investigation was conducted in 2019 using a cone penetrometer (CPT) to quantify the establishment of soil strength post sediment nourishment compared to adjacent reference sites in conjunction with traditional wetland performance measures. Results show that the nourished area exhibited weaker strengths than the reference sites, suggesting the root system of the vegetation is still establishing. The belowground biomass measurements correlated to the CPT strength measurements, demonstrating that shear strength measured from the cone penetrometer could serve as a surrogate to monitor wetland vegetation trajectories. In addition, heavily trafficked areas underwent compaction from heavy equipment loads, inhibiting the development of vegetation and highlighting how sensitive wetlands are to anthropogenic disturbances. As the need for more expansive wetland restoration projects grow, the CPT can provide rapid high-resolution measurements across large areas supplying government and management agencies with vital establishment trajectories.

/pdf/establishment-of-soil-strength-in-a-nourished-wetland-using-3huqw6teud.pdf

Susan E. Bailey

Papers

A review of potentially low-cost sorbents for heavy metals

Low Cost Sorbents Screening and Engineering Analysis of Zeolite for Treatment of Metals Contaminated Water and Soil Extracts

Low-Cost Sorbents: A Literature Summary.

Establishment of soil strength in a nourished wetland using thin layer placement of dredged sediment.