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Leaching and transformation of nitrogen in soil fertilized with digestate: A soil column study
Zhang, Xiaoqian1,2; Ni, Ji-Qin2; Wu, Shubiao1; Cui, Chang3; Pang, Changle1; Dong, Renjie1
2014
摘要The trend of rapid promotion of anaerobic digestion technology has stimulated and increased the application of digestate. The sustainability of anaerobic digestion systems depends largely on the appropriate utilization of the digestate. There is therefore a need to assess the environmental benefits and risks of digestate application. The purpose of this study was to improve the understanding of leaching and transformation of nitrogen in digestate-fertilized soil. Nitrogen leaching was studied during three plant (Pakchoi) growing cycles in a soil column of 31.5 cm diameter and a 100 cm height. In the first plant growing cycle, 200 mL digestate was surface-applied on the column soil. In the second and third cycles, 400 mL was applied each cycle. Leachate from 6 different soil depths was sampled every 3 days and analyzed for pH, ammonium, nitrate and nitrite. There were no significant differences in the pH value of leachate during the plant growth. The high ammonium contents present in the digestate were not found in the soil column system probably due to ammonia emission; and absorption, immobilization and nitrification in the soil during the study. The average concentrations of nitrate in the leachate from 80-cm soil depth were 14.8, 26.7 and 30.1 mg L-1 for the three growing cycles, respectively. They exceeded the standard on the environmental quality for groundwater in China (GB/T14848-1993). This study showed that inappropriate digestate application could present a risk of nitrite pollution to groundwater. To avoid nitrate leaching and ammonia volatilization, there is a need to select and implement digestate application techniques and application rates that can reduce nitrogen leaching.
语种英语
会议(录)名称American Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014
页码4857-4863
收录类别EI
会议地点Montreal, QC, Canada
会议日期July 13, 2014 - July 16, 2014