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Processing method for garbage leachate

A technology for landfill leachate and a treatment method, which is applied in the field of waste liquid treatment, can solve the problems of failing to meet the requirements of the secondary standard, the process flow is too long, and the ammonia nitrogen is not easy to meet the standard, etc., so as to save the cost of sludge disposal, the process flow is short, and the effect Good results

Inactive Publication Date: 2008-12-03
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. It cannot meet the requirements of the secondary standard in my country (GB16889-1997)
[0007] 3. High concentration of organic pollutants and refractory biodegradable substances and high concentration of NH 3 -N, resulting in too long process flow, complex management, high operating costs, and COD of effluent Cr and ammonia nitrogen are not easy to reach the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Sample: take landfill leachate from somewhere, the water quality is: light brown red, with foul smell, COD Cr The concentration is 3000mg / L, the pH is 6.7, the ammonia nitrogen is 220mg / L, the TP is 19mg / L, and the SS is 270mg / L.

[0031] Approach:

[0032] 1) Pretreatment: Dilute the stock solution of landfill leachate to make COD Cr The concentration is 1100mg / L, and urea and potassium dihydrogen phosphate are added to the leachate, so that the C:N:P of the leachate is 300:5:1, and the pH is adjusted to 6.8, and the temperature is controlled at 35±1°C;

[0033] 2) Upflow anaerobic sludge composite bed treatment: the treated leachate enters the upflow anaerobic sludge composite bed reactor, and the hydraulic load is controlled at 10kg COD Cr / m 3 d, the hydraulic retention time is 10 hours, the alkalinity in the reactor is controlled at 2000mg / L, and the volatile fatty acid VFA is at 600mg / L;

[0034]Upflow Anaerobic Sludge Combined Bed Reactor (UASBF): The lower p...

Embodiment 2

[0040] Sample: Take landfill leachate from somewhere, the water quality is: brownish red, with foul smell, COD Cr The concentration is 4500mg / L, the pH is 6.8, the ammonia nitrogen is 310mg / L, the TP is 26mg / L, and the SS is 380mg / L.

[0041] Approach:

[0042] 1) Pretreatment: Dilute the stock solution of landfill leachate to make COD Cr The concentration is 1000mg / L, and urea and potassium dihydrogen phosphate are added to the leachate, so that the C:N:P of the leachate is 280:3:1, and the pH is adjusted to 6, and the temperature is controlled at 35±5°C;

[0043] 2) Upflow anaerobic sludge composite bed treatment: the treated leachate enters the upflow anaerobic sludge composite bed reactor, and the hydraulic load is controlled at 8kg COD Cr / m 3 d, the hydraulic retention time is 8 hours, the alkalinity in the reactor is controlled at 1000mg / L, and the volatile fatty acid VFA is at 100mg / L;

[0044] The upflow anaerobic sludge composite bed reactor is the same as in Exa...

Embodiment 3

[0049] Sample: landfill leachate taken somewhere to run for 5 years, water quality: black with foul smell, COD Cr The concentration is 6000mg / L, the pH is 6.8, the ammonia nitrogen is 400mg / L, the TP is 35mg / L, and the SS is 510mg / L.

[0050] 1) Pretreatment: Dilute the stock solution of landfill leachate to make COD Cr The concentration is 1200mg / L, and urea and potassium dihydrogen phosphate are added to the leachate, so that the C:N:P of the leachate is 320:7:1, and the pH is adjusted to 8, and the temperature is controlled at 35±5°C;

[0051] 2) Upflow anaerobic sludge composite bed treatment: the treated leachate enters the upflow anaerobic sludge composite bed reactor, and the hydraulic load is controlled at 12kg COD Cr / m 3 d, the hydraulic retention time is 12 hours, the alkalinity in the reactor is controlled above 3000mg / L, and the volatile fatty acid VFA is below 800mg / L;

[0052] The upflow anaerobic sludge composite bed reactor is the same as in Example 1.

[...

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Abstract

The invention relates to a method for treating landfill leachate. The method adopts the technical proposal that: adding urea and monopotassium phosphate into the leachate to make the ratio of C to N to P be 280-320 to 3-7 to 1, with the pH value between 6 and 8 at a temperature of between 30 and 40 DEG C; feeding the treated leachate into an upflow anaerobic sludge compound bed reactor, with a hydraulic load between 8 and 12 kg CODCr / m<3>.d, the hydraulic detention time for 8 to 12 hours, an alkalinity in the reactor between 1,000 and 3,000 mg / L and a volatile fatty acid VFA between 100 and 800 mg / L; feeding the treated leachate into a compound bio-membrane reactor by adopting limited aeration as an aeration mode, precipitating for 0.5 to 1.5 hours at an aeration speed of between 150 and 170 L / h for 5 to 7 hours, with a sludge concentration in the reactor maintained to between 4 and 5 g / L at a water temperature of between 10 and 30 DEG C. The method has the advantages of good pollutant removal effect and low cost; moreover, a discharge water index by the method can reach the leachate discharge standard of grade II.

Description

Technical field: [0001] The invention relates to a waste liquid treatment method, in particular to a water treatment method for landfill leachate. Background technique: [0002] Landfill leachate refers to the black-brown-red aqueous solution that seeps out of the landfill due to fermentation, rainwater leaching, scouring, and surface water and groundwater soaking in the process of garbage stacking and landfilling. It is one of the main factors that produce secondary pollution during the landfill process. The water quality composition of landfill leachate is complex, the concentration of pollutants is high, the water quality and quantity change greatly, and the hazard lasts for a long time. [0003] Due to the high pollution load of leachate and the difficulty in treatment, not only the effectiveness and stability of the treatment process must be considered, but also the economic rationality of the treatment process must be considered. These outstanding characteristics of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 马溪平徐成斌王兴东付保荣李法云惠秀娟
Owner LIAONING UNIVERSITY
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