Treatment technique of garbage filter liquor

Abstract

A treatment process for landfill leachate, specifically comprising the following steps: (1) first adding a coagulant to the landfill leachate, coagulating and filtering to remove tiny fibers in the leachate; (2) filtering the leachate Enter the adjustment tank; (3) The leachate from the adjustment tank enters the evaporation system, and after evaporation, water and ammonia boil out of the leachate into steam, which becomes distilled water after condensation and is discharged, and then enters the ion resin exchange system, and the distilled water passes through the resin When the ion exchange reaction occurs, the ammonium is removed, and the ammonia nitrogen index of the distilled water is discharged after reaching the standard; the non-condensable gas and a small amount of non-condensable steam in the steam are discharged from the evaporation system and enter the absorption tower; (4) The leachate from the regulating tank enters the Evaporation system, the remaining part of the leachate after evaporation is pollutants that cannot be turned into gas and escape the evaporation system. After being concentrated into a concentrated liquid, it is discharged from the evaporation system and can be recharged to the landfill. The process is thorough and the operating cost is low.

Description

Technical field [0001] The invention relates to a process for treating landfill leachate, in particular to a process for treating landfill leachate with high efficiency, stability, thorough treatment and low operation cost. Background technique [0002] With the increase of urban population, the expansion of urban scale and the improvement of residents' living standards, the output of domestic waste is increasing sharply. As a kind of urban fixed waste disposal method, landfill is widely used at home and abroad. In my country, currently 93% The left and right urban solid wastes are landfilled. In the process of urban waste landfill, due to the compaction and the biochemical action of microorganisms, the pollutants contained in the waste will be dissolved with water, and form landfill leachate together with rainfall. However, a small amount of landfill leachate can cause serious pollution to groundwater, surface water and the surrounding environment of landfills, resulting in...

AI Technical Summary

Problems solved by technology

[0003] In my country, the leachate treatment process that can meet the national standard "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB16889-1997) is the anaerobic + aerobic + membrane treatment process. The main problems of this process are anaerobic and Incoming water COD (chemical oxygen demand) has a large relationship and is unstable. Aerobic treatment can better remove organic matter and have a good nitrification effect, but the denitrification effect is difficult to control, and the effluent nitrate nitrogen (NO3-) is relatively high

Membrane treatment has a good effluent effect, but there are biofilms that are easy to grow on the ultrafiltration membrane, frequent alkali washing, reverse osmosis membranes are easily affected by temperature, and the effluent volume varies greatly. Irrigation is difficult, and the way out has become the most difficult problem to solve. The only way to completely solve the concentrated solution is to burn it. The disadvantage is that the investment of burning is large and the operating cost is high.

[0005] In summary, at present, the only technology that can thoroughly treat landfill leachate is evaporation technology, but a single evaporation technology cannot remove the ammonia nitrogen in the leachate. Various processes for treating landfill leachate in the prior art all increase the process of ammonia nitrogen treatment, Investment, and a lot of operating costs, but it is difficult to adapt to changes in water quality concentration to achieve stable and up-to-standard discharge of effluent

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