Garbage leachate treatment process and system

Abstract

A garbage leachate treatment process and system are provided. The process includes the steps: sending a garbage leachate to a forced circulation evaporator, carrying out forced circulation evaporation of the garbage leachate, separating a crystal and separating a concentrated solution with the concentration reaching a preset concentration; sending condensed water discharged after the crystal and the concentrated solution of the garbage leachate are treated and separated in the step 1 to an ultrasonic blowoff treatment tank, blowing oxygen-containing gas to the condensed water, blowing ultrasonic waves, carrying out ultrasonic blowoff treatment, under the action of the oxygen-containing gas and the ultrasonic waves, allowing ammonia nitrogen in the condensed water to be degraded and oxidized into gas, and releasing; and inputting the condensed water after ultrasonic blowoff treatment to an electro-fenton oxidation device, carrying out electro-fenton oxidation treatment on the condensed water, destroying molecular structures of organic matters in the condensed water, generating small molecule intermediates, or mineralizing to form CO2 and H2O, and discharging discharged water having the chemical oxygen demand meeting requirements. The method has the advantages of energy-saving and environmental-protection application, and high processing efficiency.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a landfill leachate treatment process and system. Background technique [0002] Domestic waste leachate mainly comes from the moisture contained in the garbage itself in the domestic waste landfill, the rain and snow water entering the landfill and other moisture. Landfill leachate is a kind of high-concentration organic wastewater with high salt content, high concentration of organic matter, ammonia nitrogen (referring to free ammonia (or non-ion ammonia, NH 3 ) or ionic ammonia (NH 4 +) Nitrogen in form) is also denoted as NH 3 -N) high concentration, unbalanced microbial nutrient ratio, heavy metal content, large water quality fluctuations, and difficult treatment. How to properly treat it so that it can meet the discharge standards has always been a major problem in the field of environmental protection at home and abroad. Traditional treatment methods can be divided i...

AI Technical Summary

Problems solved by technology

[0004] 1. The circular tube is easy to cause the phenomenon of liquid film bias;

[0005] 2. When the evaporation concentration is too high, the flow speed will slow down, reducing the heat transfer coefficient and reducing the evaporation efficiency;

[0006] 3. The accumulation of condensed water generated during the heat exchange process in the heat exchange tube will occupy a large part of the heat exchange area, which will reduce the evaporation efficiency;

[0007] 4. The concentrated solution is easy to scale on the pipe wall, and because of the shell side, it cannot be cleaned;

[0008] 5. Need fresh steam as heat source, high energy consumption

[0011] Secondly, it is easy to drift, resulting in uneven distribution of liquid and reducing the effective heat transfer area;

[0012] Again, a layer of viscous organic dirt will be formed outside the horizontal tube and adhere to the horizontal tube, which will also greatly reduce the heat transfer coefficient of the horizontal tube

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