Heavy metals and phosphate (P) are common contaminants that associate with mining and agricultural practices. These contaminants are mitigated through a variety of processes which includes the application of chemical precipitation, membrane technologies, activated carbon, and biosorptive agricultural waste materials.
Sawdust is a potential biosorbent for heavy metals and P, which is both affordable and easily available. Recent studies have shown utility of sawdust as a biosorbent to mitigate heavy metal contaminated water. However, there exists a knowledge gap in terms of applicability of sawdust produced from local Alaskan wood products for contaminant removal, specifically at colder temperatures. Other factors to consider for heavy metal adsorption include the effect of pH and temperature on the adsorption of heavy metals.
The objective of this study is to provide an understanding of the effects of Alaskan sawdust on the biosorption of lead, cadmium, and P as common mining and agricultural contaminants in Alaska. A batch experimental study determined that sodium hydroxide treated Alaskan spruce sawdust was capable of adsorbing cadmium and lead at the temperatures of 4°C, 15°C and 30°C, respectively. This study will lead to the development of a low-cost method of mitigating contamination in drinking water, by maintaining low concentrations and/or appropriate EPA acceptable water quality limits. Such a technology could also be useful for rural Alaskan water treatment applications.
