The invention discloses a closed-
loop control system for treating landfill
leachate in cooperation with partial
nitrosation and
denitrification and a denitrifying and decarburizing method for treating the landfill
leachate. A
programmable logic controller in the
system is connected with a water inlet pump, a water outlet valve, a mud valve, a stirrer, a fan, a water inlet / outlet and an alarm floating ball switch, a sensor automatically controls the process of a reactor such as water charging, stirring, aerating, depositing, mud discharging, and water discharging, and the
system is provided with a constant temperature system to control the
reaction temperature. The denitrifying and decarburizing method comprises the following steps of: firstly stirring in an anaerobic way to denitrify partial
nitrite nitrogen and
nitrate in the reactor after the water charging, and aerating to degrade the residual
organic matter and carry out partial
nitrosation, so that the most degradable organic matters can be removed, and about 53% of
ammonia nitrogen can be converted into
nitrite nitrogen, therefore, a condition can be created for the anaerobic
ammonia oxidation treatment. The system can carry out the stable
denitrification treatment and the partial
nitrosation treatment on the landfill
leachate, can further effectively remove the organic mattes, and is high in mud settleability, high in activity, full-automatic in control, convenient and reliable.