The disposal of a large amount of biogas residue from anaerobically digested food waste is a burden for biogas production. The aim of this work was to investigate biogas residue as a potential feedstock, by preparing biochar at a broad pyrolysis temperature range of 400-900 • C. The properties required for phosphorus recovery and soil amendment application were evaluated. Biogas residue collected from an urban food waste treatment plant was pyrolyzed in a laboratory scale reactor. It was found that by increasing the pyrolysis temperature, the yield of biochar decreased and the pH, electrical conductivity and Brunauer-Emmett-Teller surface area increased. The amount of phosphorus adsorbed onto the biogas residue-derived biochar (BRB) at 900 • C was larger than that of other kinds of biochar. The kinetics of phosphorus (P) adsorption on BRB could be described by the pseudo-second-order equation. The pot experiments showed that the resulting biochar is beneficial for the growth of cabbage. Overall, turning solid residue from the anaerobic digestion of food waste for biogas production into biochar shows good prospects as a means of solving the disposal problem, while creating new markets for food waste biogas residue.
In view of the negative impact of Sino-US trade friction on China's cross-border e-commerce, this paper gives a brief analysis of the development status and characteristics of China's cross-border e-commerce in the light of the related theories of cross-border e-commerce and the strategy of "one belt and one road". The "one belt and one road" initiative has been implemented for 6 years, and has played an obvious role in expanding consumer demand and promoting the transformation and upgrading of cross-border e-commerce. And how to solve a series of problems arising from the Sino-US trade war with the help of "one belt and one road" and the future development trend are the key points of this article.
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