High-efficiency treatment method for urban and town landfill leachate

Abstract

The invention discloses a high-efficiency treatment method for an urban and town landfill leachate. The method comprises the following steps: step 1, the landfill leachate is pretreated: the landfillleachate enters a mixer, a coagulation reaction tank, a sedimentation tank and a clear-liquid tank in sequence; calcium hydroxide is added into the mixer for softening the landfill leachate and adjusting the pH value to make the pH value suitable for the requirement of a coagulant; the coagulant is added into the coagulation reaction tank, coagulation is performed, the formed system enters the sedimentation tank, sedimentation is performed, and a supernatant obtained by overflow enters the clear-liquid tank; and cyclone concentration is performed on a solid-liquid mixture located at the bottomof the sedimentation tank, the concentrated mixture is discharged to a sludge concentration tank, a solid in the sludge concentration tank is transported regularly to a landfill site, and landfill isperformed; step 2, the supernatant after precipitation enters an MVR evaporation device through the clear-liquid tank, and evaporation is performed; and step 3, distilled water output by the MVR evaporation device enters an activated carbon tower device, adsorption treatment is performed, and water is discharged after the water quality reaches the standard. The method provided by the invention has the advantages of a simple process, a high degree of automation, good treatment effects and low operating costs, and is convenient for management and maintenance.

Description

technical field [0001] The invention relates to the technical field of environmental engineering sewage treatment, in particular to a method for efficiently treating urban garbage leachate. Background technique [0002] Leachate is the product of gravity flow of liquid in a landfill, mainly from precipitation and the embedded water of the waste itself. Since many factors may affect the properties of the leachate during the flow of the liquid, including physical factors, chemical factors and biological factors, the properties of the leachate vary within a considerable range. Generally speaking, its pH value is between 4 and 9, COD is in the range of 2000 to 62000mg / L, BOD5 is from 60 to 45000mg / L, and the concentration of heavy metals is basically the same as that in municipal sewage. The leachate of urban waste landfill is a kind of high-concentration organic wastewater with complex components. If it is directly discharged into the environment without treatment, it will cau...

AI Technical Summary

Problems solved by technology

However, the MBR process and DTRO process also have disadvantages: 1. The biochemical system takes a long time to debug and it is difficult to cultivate microorganisms; 2. The operation and maintenance of the membrane system is complicated; 3. The operation cost is high and the concentrated water treatment is difficult

Images