Method for treatment of landfill leachate until to achieve up-to-standard direct discharging

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, and achieve anti- The effect of strong water impact and flexible operation

Active Publication Date: 2017-10-20
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 concentra...

Method used

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  • Method for treatment of landfill leachate until to achieve up-to-standard direct discharging
  • Method for treatment of landfill leachate until to achieve up-to-standard direct discharging
  • Method for treatment of landfill leachate until to achieve up-to-standard direct discharging

Examples

Experimental program
Comparison scheme
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 wastewater treatment, and in particular relates to a method for treatment of landfill leachate to achieve up-to-standard direct discharging. The method comprises the following steps: anaerobic biological treatment-aerobic biological treatment-iron carbon micro electrolysis-Fenton oxidation-catalytic ozonation-electrolysis catalytic oxidation. The landfill leachate is treated by the method to achieve up-to-national standard discharging, and the method has the advantages of deep wastewater treatment, flexible operation, strong water shock resistance and low processing cost. Most organic matters and total nitrogen are removed by biological methods with low processing cost, the remaining part of the organic matters are removed by the iron carbon micro electrolysis process, then hydrogen peroxide is added for Fenton oxidation, an electrode coating is used for catalytic oxidation, treatment effect is ensured, meanwhile current density between electrode plates is reduced, power consumption is reduced, and treatment cost is reduced.

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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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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