Research on the preparations and properties of fertilizer recycling from biomass ash, slags, and waste acid liquid from desulfurization and denitrification process of flue gas.

To realize the harmless treatment of various wastes and develop alternative fertilizers, fly ash and slags were soaked in waste acid liquid from desulfurization and denitrification to extract N, P, K, and other nutrient elements for fertilizer preparation. The experiments had shown that both slags with special porous structure and unburned biochar derived from biomass fly ash had good adsorption performance for crystalline salt, while the fine particles existing in biomass fly ash had significant agglomeration effects on crystalline salt. The coupling among the three substances above formed the multi-dimensional cross-scale structure carriers with sizes in the nanometer to millimeter range, which had good adsorption capacities for crystalline salt and effectively improved the slow-release performance of the self-prepared solid fertilizer. The microwave irradiation further enhanced the slow-release performance of the self-prepared solid fertilizer by promoting the coupling effects among various raw materials. Lastly, aiming the self-prepared solid fertilizer, the increments of plant height, leaf width, leaf length, and expansion diameter of chlorophytum were 5.10%, 77.19%, 47.37%, and 4.05%, respectively, higher than those with commercial solid fertilizer. These desirable slow-release characteristics and positive effects on chlorophytum growth highlighted the self-prepared fertilizer potential to improve plant growth. [ABSTRACT FROM AUTHOR]