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Domestic waste landfill leachate treatment method

A technology of domestic waste and treatment method, which is applied in the field of leachate treatment process of domestic waste landfill, which can solve the problems of high salinity in leachate, salt enrichment in landfill, complex organic components, etc.

Pending Publication Date: 2021-12-24
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main disadvantages of the existing process: high salinity in leachate, complex organic components, poor effect of conventional biochemical treatment, difficult to ensure effective treatment of leachate
At present, the more popular membrane treatment in China has a better treatment effect, and the leachate reaches the standard and is stable, but the recharge of a large amount of concentrated liquid will enrich the salt in the landfill, and the leachate is becoming more and more difficult to treat.

Method used

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  • Domestic waste landfill leachate treatment method

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Effect test

Embodiment 1

[0019] Embodiment 1: adopt certain refuse landfill leachate that the inventive method handles, and step is as follows figure 1 shown;

[0020] S1, leachate raw water COD=7000~7500mg / L, NH 3 -N=3500~4000mg / L, PH=6~7. The leachate is pretreated by acid adjustment, and sulfuric acid is added to adjust the pH to about 4.3. After the leachate enters the primary MVR and evaporates, the COD of the condensate drops to 362mg / L, and the NH 3 -N decreased to 707mg / L, PH=6.3. Enter the deamination membrane system, adjust the pH to above 9.5, and absorb the free ammonia nitrogen in the leachate through sulfuric acid. Effluent NH 3 -N=17 mg / L, pH=9.2. After that, the leachate enters the secondary MVR to evaporate, and after evaporation, the condensate COD=68mg / L, NH 3 -N=15mg / L, PH=8.6, and the effluent meets the standard in Table 2 of the "Standards for Pollution Control of Domestic Garbage Landfill" (GB16889-2008).

Embodiment 2

[0021] Embodiment 2: The treatment method of leachate of a certain domestic waste landfill, raw water COD=10000~11000mg / L, NH 3 -N=3000~3500mg / L, PH=8~9.

[0022] S1, the acid-adjusting pretreatment is performed on the raw water of the landfill leachate, and the pH value of the raw water of the leachate is adjusted to make the leachate acidic;

[0023] S2: Send the product water obtained in step S1 into the first-stage MVR evaporation system to remove most of the organic matter in the leachate, and obtain the condensate after the first-stage evaporation;

[0024] S3: send the water produced in step S2 into the deamination membrane system to realize the efficient removal of ammonia nitrogen in the leachate;

[0025] S4: The water produced in step S3 is sent to the secondary MVR evaporation system to further remove the difficult-to-handle small molecular organic matter in the leachate, so as to achieve the standard discharge of the leachate. After the mother liquor evaporated ...

Embodiment 3

[0026] Embodiment 3: adopt certain refuse landfill leachate that the inventive method handles, raw water COD=5000~6000mg / L, NH 3 -N=2000~2500mg / L, PH=6~7. The leachate raw water is pretreated to adjust the acidity and add sulfuric acid to adjust the pH to about 4.3. After the leachate enters the primary MVR and evaporates, the COD of the condensate drops to 200-300mg / L, and the NH 3 -N decreased to 400~600mg / L, PH=6~7. Enter the deamination membrane system, adjust the pH>9.5, absorb the free ammonia nitrogen in the leachate through sulfuric acid, and the effluent NH 3 - N 3 -N<25mg / L, PH=6~9, and the effluent meets the standard in Table 2 of the "Standards for Pollution Control of Domestic Garbage Landfill" (GB16889-2008).

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Abstract

The invention discloses a domestic waste landfill leachate treatment method which comprises the following steps: S1, carrying out acid adjustment pretreatment on landfill leachate raw water, and adjusting the pH value of the leachate; s2, feeding the produced water obtained in the step S1 into a first-stage MVR evaporation system, and removing most organic matters in the leachate to obtain evaporated condensate; s3, feeding the condensate in the step S2 into a deamination membrane system, and realizing efficient removal of ammonia nitrogen in the leachate; s4, feeding water produced in the step S3 into a secondary MVR evaporation system, further removing micromolecular organic matter difficult to treat in the percolate, and realizing up-to-standard discharge of the percolate; and carrying out solidification and landfill treatment on the mother liquor after MVR evaporation. According to the invention, full-quantitative treatment of the leachate of the domestic waste landfill is realized, and a new idea is provided for leachate treatment.

Description

technical field [0001] The invention relates to the field of landfill leachate treatment, in particular to a leachate treatment process for domestic waste landfills. Background technique [0002] Landfill leachate is a kind of high-salt and high-concentration organic leachate produced in the process of waste treatment. It has the characteristics of complex leachate composition, great changes, and many types of pollutants. [0003] my country has very strict requirements on the discharge of landfill leachate, especially in landfills, where a large amount of landfill leachate is produced every day, which is difficult to deal with. [0004] my country's landfill leachate discharge requirements are directly discharged in non-sensitive areas, and the standards in Table 2 of the "Standards for Pollution Control of Domestic Waste Landfill" (GB16889-2008) are implemented, where COD≤100mg / L, ammonia nitrogen≤25mg / L, and total nitrogen≤ 40mg / L, total phosphorus ≤ 3mg / L, in addition, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/06C02F1/66C02F1/04C02F1/20C02F101/16
CPCC02F9/00C02F2103/06C02F1/66C02F1/04C02F1/20C02F2101/16
Inventor 宫建瑞强胜徐瑞定李春泉刘彦奎
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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