Research on the treatment of heavy metal pollution in urban soil based on biochar technology

Abstract

Biochar is a material for remediating soil contaminated by heavy metals, and it is also a remediation material for soil improvement. The remediation effect of biochar and its mechanism have been widely concerned in the environmental field. The most important factor that determines the effect of biochar remediation is the diversity of its physical and chemical properties. Cities are extremely important places for human life and production. From a global perspective, the area of cities only occupies less than 2% of the surface area. Urban soil refers to the general term for the original characteristics of the soil in the city or in the suburbs of the city, which are affected to varying degrees by human activities. Therefore, it is very meaningful to study the ecological effects, the chemical migration characteristics of the earth and the sources of heavy metals in urban soils. Based on the current status of heavy metal pollution in urban soils, and at the same time, due to the application potential of biochar in remediation of heavy metal contaminated soil and soil improvement, it is studied to study the effect of 400 °C sludge biochar on heavy metals (Cr, Zn, Cu) The remediation effect of contaminated soil, and at the same time, the raw material sludge is directly used as the remediation material to compare the long-term effects of sludge biochar and sludge on the physical and chemical properties of the soil, the form of heavy metals and the bioavailability, and fully consider The effect of biochar’s aging effect on the repair effect.