Dissolution Characteristics of Ammonium and Nitrate in Soil with Bottom Ash from Biomass Power Plant

다국어 초록 (Multilingual Abstract)

Recently, biomass power plants are increasing as an alternative energy source to reduce the carbon emissionsfrom fossil fuels. The amount of waste from biomass power plants increases and bottom ash is generally buriedin soil. However, there is little research on the dissolution characteristics of nitrogen, a macronutrient in soil,using bottom ash (BA). To evaluate nitrogen dissolution in soil with BA, we mixed BA with soil, collectedleachate for 5 weeks, and measured NH4+-N and NO3--N concentration in leachate. As a results, BA reducedthe leaching of NH4+-N and NO3--N by up to 18% and 38%, respectively. The decrease of NH4+-N leaching isjudged to be the result of increased NH4+-N adsorption due to the high pH of the bottom ash, and these resultsare often confirmed in other biochar. The NO3--N leaching also decreased, but it is not related to the adsorptioncapacity of BA, so further research is needed. These results suggested that BA reduces the contents of NH4+-Nand NO3--N in the soil effluent, which can be used as an important indicator for using bottom ash in the soil.