Closed-loop control system for treating landfill leachate in cooperation with partial nitrosation and denitrification and denitrifying and decarburizing method thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of wastewater biological treatment, in particular to a closed-loop control system for partial nitrosation combined with denitrification to treat landfill leachate. Background technique [0002] Landfill leachate has complex components, high pollution load, difficult treatment, and great potential harm to surface water and groundwater. In addition, with the increase of landfill age, the carbon-nitrogen ratio of landfill leachate will gradually decrease, and its biochemical properties will become worse and worse, which seriously restricts the denitrification effect and treatment load of conventional biological denitrification process on leachate. Partial nitrification and anammox process bring new hope for the economical treatment of high ammonia nitrogen wastewater such as landfill leachate due to its advantages of energy saving, carbon source saving and low sludge production. [0003] At present, the use of...

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Problems solved by technology

The above-mentioned treatment methods that have been reported mainly adopt the control mode of high temperature and low SRT, which requires high energy consumption and brings inconvenience to the operation. The amount of sludge retained by the reactor is also very low, and its high load It is also at the expense of a high effluent nitrogen substrate concentration, which puts a lot of pressure on the subsequent anaerobic ammonium oxidation, and is not conducive to the advanced treatment of organic matter

CN1769211A describes a system for treating leachate with a low carbon-to-nitrogen ratio (about 0.72) in combination with partial nitrosation and anaerobic ammonium oxidation. The system needs to add additional acid-base agents to adjust the pH value, and fails to fully utilize the degradable organic matter in the wastewater To remove nitrogen, the economics and sustainability of the process have not reached a higher level

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