Exprimental Study on Acceleration of Landfill Stabilization Process Using Bioaugmentation Technology

In order to overcome the drawbacks of traditional methods in landfill treatment, such as slow degradation of organic waste, long-lasting stabilization, and complicated operation and management, a new bioaugmentation technology was proposed to accelerate the stabilization of landfill processing. Through indoor simulation experiments, a composite microbial system was introduced, and its influences on the landfill waste stabilization of bioreactor landfill was studied. The results show that the multifunctional microbe community accelerated the biodegradation of organic waste: A landfill temperature rise of 0.8-5.0 ℃ was observed in the landfill during the early and mid stages, and the pH value in landfill increased rapidly over 8.0 and became stable 208 days earlier than the control. Moreover, compared with the control group, the composite microbial system in the experimental group reduced the COD (chemical oxygen demand) concentration of leachate more obviously, which remained at about 3 000 mg/L after 505 days of anaerobic landfilling. The concentration of ammonia nitrogen decreased more rapidly, keeping lower than the control after 463 days, and reaching the level below 25 mg/L after 700 days, which meet discharge requirements of ammonia nitrogen in leachate specified by the National Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 168892008). The composite microbial system also increased the deposition capability as much as by 27.39%, 19.23% and 14.81% when compared with the control group at the early, mid, and end stages of landfill processing, respectively.