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Method for treating landfill leachate until it meets the standard and is directly discharged

A landfill leachate and direct discharge technology, which is applied in the direction of contaminated groundwater/leachate treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high concentration of refractory organic matter and paralysis of the treatment system

Active Publication Date: 2021-07-06
SHANDONG LONGANTAI ENVIRONMENTAL PROTECTION SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The landfill leachate after the three-stage treatment can meet the requirements of water reuse, but the double-membrane process will produce concentrated water during the three-stage treatment process, and the reverse osmosis concentrated water can be returned to the front end of the nanofiltration as the nanofiltration feed water, while the nanofiltration concentrated water The water has accumulated a high concentration of various salts and organic matter, and there is no economical and effective treatment method to deal with it. Generally, it is recharged to the landfill, resulting in an increasing concentration of salt and refractory organic matter in landfill leachate , leading to the paralysis of the original processing system

Method used

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  • Method for treating landfill leachate until it meets the standard and is directly discharged
  • Method for treating landfill leachate until it meets the standard and is directly discharged
  • Method for treating landfill leachate until it meets the standard and is directly discharged

Examples

Experimental program
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Effect test

Embodiment 1

[0095] The leachate produced during the waste stacking process of a waste incineration plant: After testing, the COD in the leachate is 13600mg / L, the ammonia nitrogen is 1800mg / L, the nitrate is 210mg / L, and the total nitrogen is 2500mg / L.

[0096] Adopt processing method provided by the invention to process:

[0097]The leachate to be treated first enters the anoxic biological pool 1, and the sludge concentration in the anoxic biological pool 1 is kept at 9000mg / L, the dissolved oxygen is at 0.2mg / L, and the pH value is 6. The residence time is 50 hours, and the effluent from the anoxic biological pool 1 enters the aerobic biological filter 2;

[0098] In the aerobic biofilter 2, a semi-soft biological filler is suspended, and the filling volume ratio of the biological filler is 40%; the suspended sludge concentration in the aerobic biological filter 2 is kept at 5000 mg / L, and the dissolved oxygen is at 6.0 mg / L. The pH value is 9, and the hydraulic retention time is 50 ho...

Embodiment 2

[0107] The leachate produced by a garbage treatment plant: COD is 4500mg / L, ammonia nitrogen is 1200mg / L, nitrate is 110mg / L, and total nitrogen is 1500mg / L.

[0108] Adopt the processing method provided by the present invention to process: the leachate to be treated first enters the anoxic biological pool 1, and maintains that the sludge concentration in the anoxic biological pool 1 is 5000 mg / L, dissolved oxygen is 0.3 mg / L, and the pH value is 7. The mud-water mixing method adopts submerged mechanical stirring, and the hydraulic retention time is 25 hours. The effluent from the anoxic biological pool 1 enters the aerobic biological filter 2;

[0109] Keep the suspended sludge concentration in the aerobic biofilter 2 at 3000mg / L, the dissolved oxygen at 4.0mg / L, the pH value at 8, and the hydraulic retention time at 25 hours. Part of the organic matter and ammonia nitrogen in the water are produced by the aerobic microorganisms attached to the carrier decomposed into CO 2 、...

Embodiment 3

[0118] The leachate produced by a landfill: COD is 3000mg / L, ammonia nitrogen is 630mg / L, nitrate is 58mg / L, and total nitrogen is 740mg / L.

[0119] Adopt the treatment method provided by the present invention to process: the leachate to be treated first enters the anoxic biological pool 1, maintains that the sludge concentration in the anoxic biological pool is 3000mg / L, dissolved oxygen is at 0.4mg / L, and the pH value is 9, muddy water The mixing method adopts submerged mechanical stirring, the hydraulic retention time is 10 hours, and the effluent from the anoxic biological pool 1 enters the aerobic filter tank 2;

[0120] Keep the suspended sludge concentration in the aerobic filter 2 at 1000mg / L, the dissolved oxygen at 2.0mg / L, the pH value at 8, and the hydraulic retention time at 10 hours. Part of the organic matter and ammonia nitrogen in the water are decomposed by the aerobic microorganisms attached to the carrier for CO 2 、H 2 O, NO 3 2- , the effluent part of ...

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Abstract

The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for direct discharge of landfill leachate up to standard. The method for treating landfill leachate until it meets the standard for direct discharge includes the following steps: anaerobic biological treatment-aerobic biological treatment-iron-carbon micro-electrolysis-Fenton oxidation-ozone catalytic oxidation-electrolytic catalytic oxidation. The method of the invention is used to treat the landfill leachate, which meets the requirements of the national standard, has deep waste water treatment degree, flexible operation, strong ability to resist the impact of incoming water, and low treatment cost. In the present invention, the biological method with low treatment cost is used to remove most of the organic matter and total nitrogen, and the iron-carbon micro-electrolysis process removes the remaining part of the organic matter, then hydrogen peroxide is added, Fenton oxidation is used, and the electrode coating is used for catalytic oxidation, while ensuring the treatment effect Reduce the current density between the plates, save power consumption, and reduce processing costs.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for direct discharge of landfill leachate up to standard. Background technique [0002] Landfill leachate is high-concentration organic wastewater produced by solid waste under the action of physics, chemistry and microorganisms due to leaching of atmospheric precipitation and immersion of surface water and groundwater after landfill treatment. Landfill leachate comes from three aspects: one is atmospheric rainfall (snow), surface runoff and groundwater intrusion; Pollutants in landfill leachate mainly come from: a large amount of soluble organic matter and inorganic matter contained in the waste itself; organic matter and inorganic matter dissolved in the leachate during the immersion of rainwater, surface water or groundwater; waste through biological, physical, Soluble material from chemical action and soluble material from cover a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/30C02F103/06
CPCC02F1/461C02F1/46109C02F1/4672C02F1/722C02F1/725C02F1/78C02F3/30C02F9/00C02F2101/16C02F2101/30C02F2103/06C02F2201/461C02F2301/08
Inventor 代春龙
Owner SHANDONG LONGANTAI ENVIRONMENTAL PROTECTION SCI TECH CO LTD
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