Coal mining byproduct highly effective for land reclamation
A researcher at the University of Alberta in Canada has discovered that nano humus, a substance extracted from coal mine deposits and then crushed to a black, powdery material is highly effective at helping reclaim the land and water used in mining.
According to Yihan Zhao, nano humus has “outstanding physical and chemical properties” that remove heavy metals from contaminated water and soil. The material is made up of natural organic compounds and it works like a sponge that attaches and holds heavy metals.In Zhao’s view, her findings offer the potential option for a low-cost, more efficient way to remediate industrial wastewater and soil affected by resource extraction and manufacturing processes. This, she said, is of particular relevance in developing countries.
NANO HUMUS HAS “OUTSTANDING PHYSICAL AND CHEMICAL PROPERTIES” THAT REMOVE HEAVY METALS FROM CONTAMINATED WATER AND SOIL
She also noted that conventional remediation treatments for heavy metals use large amounts of chemicals which, in turn, can produce further contaminants that require treatment. Some remediation methods also require large amounts of electricity or can take days or months to complete.
However, nano humus and similar compounds can be used not only for quicker remediation of contaminants, but can also contribute to soil-building by partially or completely replacing the bulkier materials of manure and straw typically used to amend the soil.
In a media statement, the researcher said that now she would like to partner with Canadian industries in mining reclamation to field test the nano humus.
Zhao believes that moving from lab research to industrial-scale application will help to determine the actual costs and efficacy of using the material under natural environmental conditions.