Landfill leachate treatment method

Abstract

The invention relates to a landfill leachate treatment method. The landfill leachate treatment method comprises following steps in sequence: pretreatment comprising steps of flocculating sedimentation, ammonia stripping, ammonia adsorption and processes of regulating pH and adjusting the temperature of the leachate to be not lower than 15 DEG C, primary anoxic-aerobic biological treatment, primary sedimentation treatment, chemical oxidation treatment, secondary sedimentation treatment, secondary anoxic-aerobic biological treatment, tertiary sedimentation treatment and disinfection treatment. According to the landfill leachate treatment method, a physicochemical and biochemical combined treatment system is adopted based on the characteristics of the municipal solid waste landfill site leachate, so that stable and efficient operation of the whole system is guaranteed, and the landfill leachate reaches the emission standard of Standard for Pollution Control on the Landfill Site Of Municipal Solid Waste (GB16889-2008) finally.

Description

technical field [0001] The invention relates to a treatment method for leachate of sanitary landfills of urban domestic garbage, and belongs to the technical field of environmental engineering sewage treatment. Background technique [0002] Landfill leachate refers to the moisture contained in the garbage itself in the landfill, the rain and snow water and other moisture entering the landfill, deducting the saturated water holding capacity of the garbage and the covering soil, and passing through the garbage layer and the covering soil. A high concentration wastewater. High concentration of ammonia nitrogen is one of the water quality characteristics of leachate, and the concentration of ammonia nitrogen in leachate generally ranges from tens to thousands of milligrams per liter. According to the law of water quality change of leachate produced in domestic solid waste landfills, with the prolongation of landfill time, the concentration of ammonia nitrogen in leachate tends ...

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Problems solved by technology

[0016] The biggest feature of the fourth category of treatment process is that it does not use ultrafiltration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO) and other membrane components, so no concentrated liquid is produced

[0021] It can be seen from the above table that although the treatment effects of the first, second and third categories of treatment processes are stable and the effluent quality is excellent, the total investment of the project and the cost per ton of water treatment are high, and the high investment and operation costs will affect the landfill. The operation brings a heavy economic burden

The fourth type of process has the advantages of low total project investment and low operation cost per ton of water, but the operation of treatment facilities is greatly affected by the environment and the operation and management are more complicated

When the external ambient temperature changes sharply, the fourth largest treatment process will fluctuate greatly in total nitrogen removal efficiency

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