Temporal and Spatial Distribution Characteristics of Nitrate Nitrogen in Leachate of the Semi-Aerobic Landfill Treatment

Abstract:

Contrast experiment was developed on the semi-aerobic and anaerobic landfill treatment. Leachate nitrate nitrogen concentrations in different landfill layers spatially were monitored regularly in two landfill equipments, and variations and differences of leachate nitrate nitrogen concentration of different landfills were discussed. The results showed that differences on the variation characteristics of nitrate nitrogen concentration in space and time were obvious in the landfill treatments with different structures. In 73 weeks of monitoring period, nitrate nitrogen concentration in the middle and the lower layer of semi-aerobic landfill treatment was in turn stable within 55.40 mg/L and 40.80 mg/L; The concentration fluctuations in both layers were small in general. Nitrate nitrogen concentration decreased respectively to 9.26 mg/L, 6.82 mg/L and 4.69 mg/L at the 73th week from 28.51 mg/L, 4.44 mg/L and 5.85 mg/L at the initial landfill stage in the lower , middle and the upper layer of anaerobic landfill treatment. When degradation of the landfill treatments went into relatively stable stage, nitrate nitrogen concentration in the upper, middle and the lower layer of semi-aerobic landfill treatment was located respectively in 30-240 mg/L, 2.5-11.0 mg/L and 5.5-13.5 mg/L respectively, and the spatial distribution difference of nitrate nitrogen concentration in the upper layer of semi-aerobic landfill treatment was relatively big, but those of the middle and the lower layer were relatively small, and they were both lower than the upper layer. Nitrate nitrogen concentration in the upper, middle and the lower layer of anaerobic landfill treatment was located in 1.6-7.4 mg/L, 3.8-7.2 mg/L and 7.5-15 mg/L respectively, and showing a performance of spatial nitrate nitrogen concentration that was the lower layer> the middle layer >the upper layer. Under the experimental conditions, seim-aerobic landfill treatment was favorable to the nitrification and denitrification of leachate in contrast with the anaerobic landfill treatment.

• Periodical: Applied Mechanics and Materials (Volume 768)
• Pages: 256-263
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.768.256
• Online since: June 2015
• Authors: Xiang Rui Pang*, Dan Chen, Xiao Long Wang, Qi Fei Huang, Zheng An Zhang, Jie Wang, Jia Qi Zhang, Chen He Zuo, Hai Qiang Li
• Keywords: Leachate, Nitrate Nitrogen, Semi-Aerobic Landfill Treatment, Spatial Distribution, Temporal Distribution

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