Enhancement of Biochar from Waste for Soil remediation in urban areas
Purpose and goal
Increasing amount of soils are contaminated with heavy metals as well as with polycyclic aromatic hydrocarbons (PAH). Even low contaminated soil needs to be excavated and carried off-site for treatment, which is costly. Using biochar for soil remediation instead of removing toxics from the soil provides a solution for in-situ treatment at lower cost. Biochar adsorbs and locks receptors of the toxics, thus prevents plants and soil life from absorbing toxics. There are little available know-how on how to achieve optimal performance for soil-remediation while minimizing costs.
Expected results and effects
The project will increase the understanding of techniques that can be used to refine and optimize biochar for soil remediation. By refining biochar mechanically, while mixing in locally accessible biowaste, one can significantly reduce material costs of soil remediation with biochar. Pre-treatment of biochar increases the absorption capacity for water and the sorption capacity. The higher efficiency can further reduce the amount of biochar required to treat the soil, which would lead to reduced soil remediation costs and increase the use of biochar in society at large.
Planned approach and implementation
We have developed 2 recipes of a mix of biochar, grass, minerals etc. Another approach lies in the physical treatment of biochar to increase surface area with two mechanical processes to improve adsorption activity. The main goal of the tests is to measure adsorption capacity of PAH and heavy metals of two different post-treated biochar recipes in laboratory tests. The project will perform a desk study to compare available treatment methods technically, including a market study to quantify the market opportunity for enhanced biochar products for soil remediation.