Feasibility analysis of waste humus soil for Urban Greening

Abstract

From the landfill site which was closed for 15 years,10mm sieved humus soil was extracted as test material, to build the wild plant simulation leaching system. The regularity of pollutant release and the migration of heavy metals were studied in the system, in order to explore the feasibility of using humus soil for urban greening. The test results showed that the pH value of the leaching solution is between 6.8 and 7.7; the COD value is basically stable between 40 mg / L and 75 mg / L; the concentration of NH3-N is less than 1 mg / L; Between 200mg / L, it mainly exists in the form of nitrate nitrogen. Total and Morphology Analysis of four heavy metals (Cu, Zn, Pb, Ni) showed that all the metals were able to achieve the soil environmental quality risk of soil pollution control standard for GB36600-2018 in the nature of the land of green space and square, and the proportion of exchangeable and carbonate binding states in the four heavy metal were small, meanwhile the dissolution and mobility were small. In conclusion, humus soil has the feasibility to use for urban greening.