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Combination system for treating landfill leachate and method for treating landfill leachate by using combination system

A landfill leachate and combined system technology, which is applied to the combined system for treating landfill leachate and the field of landfill leachate treatment, can solve problems such as increasing cleaning difficulty and cleaning frequency, shortening continuous operation time, and hindering the smooth progress of evaporation, etc., to achieve The effect of extending the continuous operation time, shortening the processing cycle, and improving the continuous operation time

Inactive Publication Date: 2014-02-19
广东云水谣环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual work, it is also found that this combined process is not suitable for the treatment of fresh landfill leachate: 1) There are a lot of SS (solid suspended solids), colloids, grease, etc. in fresh landfill leachate, and it is not only easy to produce foam when it evaporates , hinders the smooth progress of evaporation, and is particularly easy to scale on the surface of the heat exchange tube, which greatly shortens the effective evaporation time, significantly increases the cleaning frequency, and also significantly increases the difficulty and frequency of cleaning, greatly shortening the continuous running time; 2), Since there are many easily degradable organic substances in the fresh landfill leachate, some low molecular weight and volatile organic substances enter the distilled water, which significantly increases the COD of the distilled water and increases the difficulty of subsequent biochemical treatment.

Method used

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  • Combination system for treating landfill leachate and method for treating landfill leachate by using combination system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A garbage transfer station in Shanghai produces about 200 tons of landfill leachate per day. The original COD of the filtrate is about 15,000 mg / L, the SS is about 9,000 mg / L, the ammonia nitrogen is about 40 mg / L, and the chroma is about 500 times.

[0030] Proceed as follows:

[0031] (1) After the landfill leachate is coagulated, it is pumped into the UF system of the leachate combined system through a water pump with a lift of 30 meters. The UF filter membrane has a pore size of 0.1 μm and is made of polypropylene nitrile. The liquid COD after ultrafiltration is reduced to 5600mg / L, SS is reduced to 40mg / L, and the separated sludge is dehydrated and then incinerated;

[0032] (2) Use a water pump to pump the supernatant into the water volume regulator to adjust the water volume and then enter the MVC system for evaporation. No foam is generated during the evaporation process. The COD of the evaporated liquid is determined to be 600 mg / L, and the water and supernatan...

Embodiment 2

[0037] A garbage transfer station in Nanjing produces about 400 tons of landfill leachate per day. The original COD of the filtrate is about 20,000 mg / L, the SS is about 11,000 mg / L, the ammonia nitrogen is about 60 mg / L, and the chroma is about 500 times.

[0038] Proceed as follows:

[0039] (1) After coagulation, the landfill leachate is pumped into the coagulation and sedimentation system of the leachate combined system through a water pump with a lift of 35 meters. The coagulation and sedimentation condition is to add a polymer coagulant aid. After coagulation and sedimentation, the COD of the liquid is reduced to 5000mg / L, and the SS is reduced to 36mg / L, and the separated sludge is directly recharged;

[0040] (2) Use a water pump to pump the supernatant into the water volume regulator to adjust the water volume and then enter the MVC system for evaporation. No foam is generated during the evaporation process. The COD of the evaporated liquid is determined to be 500 mg / ...

Embodiment 3

[0045] A garbage transfer station in Wuxi produces about 250 tons of landfill leachate per day, the original COD of the filtrate is about 12000mg / L, the SS is about 8000mg / L, the ammonia nitrogen is about 40mg / L, and the chroma is about 400 times.

[0046] Proceed as follows:

[0047] (1) After coagulation, the landfill leachate is pumped into the UF system of the leachate combined system through a water pump with a lift of 25 meters. The UF filter membrane has a pore size of 0.04 μm and is made of polypropylene nitrile, and is carried out by cross-flow ultrafiltration. Ultrafiltration. After coagulation and sedimentation, the measured COD drops to 4600mg / L, SS drops to 28mg / L, and the separated sludge is directly refilled;

[0048] (2) Use a water pump to pump the supernatant into the water volume regulator to adjust the water volume and then enter the MVC system for evaporation. No foam is generated during the evaporation process. The COD of the evaporated liquid is determi...

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Abstract

The invention discloses a combination system for treating landfill leachate and a method for treating landfill leachate by using the combination system. The combination system for treating the landfill leachate is formed by combining a solid-liquid separation system, an MVC (Mechanical Vapor Compression) evaporation system and a biological treatment system. When being treated, the landfill leachate firstly passes through the solid-liquid separation system to ensure that the contents of COD (Chemical Oxygen Demand), SS (Suspended Substances), colloids, grease and the like in a supernatant liquid are greatly reduced, so that the evaporation efficiency of the supernatant liquid entering the MVC evaporation system is greatly increased, the MVC blockage is avoided, the scaling is delayed to the maximum extent, and the scaling problem is easier to solve; meanwhile, the concentration of the COD in water evaporated by MVC is greatly reduced so that the subsequent biological treatment becomes simpler and easier. Therefore, the combined treatment process for the landfill leachate is very remarkable in synergistic effect and suitable for large-scale popularization.

Description

technical field [0001] The invention belongs to the field of domestic waste treatment, in particular to a combined system for treating landfill leachate and a method for treating landfill leachate. [0002] Background technique [0003] With the rapid development of my country's urbanization process, the amount of urban domestic waste in my country is increasing at an average annual rate of 8-10%, and proper disposal of waste has become a worldwide topic. The most important treatment methods for municipal solid waste are: 1), sanitary landfill method; 2), incineration power generation method; 3), composting method, etc. Regardless of the treatment method, landfill leachate will be produced during the treatment process, even in the waste transfer station, a large amount of leachate will be produced. Landfill leachate has the characteristics of complex components and high concentration, and is extremely difficult to treat. It is one of the key issues of environmental protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 黄凯锋李影辉王亮亮吉宏
Owner 广东云水谣环保科技有限公司
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