Treatment method of landfill leachate

A technology for landfill leachate and a treatment method, which is applied in the field of wastewater treatment, can solve the problems of failing to meet the requirements of secondary standards, high operating costs, and large floor space, and achieves strong adaptability to changes in water quality, high automation, and durability. High impact load effect

Inactive Publication Date: 2013-12-18
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Poor ability to adapt to water quality changes, especially poor ability to adapt to water quality changes throughout the landfill period
As the landfill leachate water quality prolongs with the landfill time, the BOD 5 /COD Cr It shows a downward trend, and the system will run well in the early stage of landfill, but the system will not adapt to it in the later stage
[0...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A method for treating landfill leachate, which includes the following steps:

[0022] 1) Pretreatment: First, the landfill leachate is intercepted by the mechanical grid to remove suspended matter and floating matter, and then coagulants PAC and PAM are added to obtain the supernatant; the mechanical grid has the function of automatic slag removal. The gap is 8mm, the grid inclination is 50o; the dosage of coagulant PAC is 70mg / L, and the dosage of PAM is 5mg / L.

[0023] 2) Ultrafiltration: the supernatant is pumped into the ultrafiltration tank, after coagulation and precipitation in the ultrafiltration tank, the alum is retained by the ultrafiltration membrane to remove metals, SS and some organic matter; the ultrafiltration membrane uses hollow fiber membranes , The membrane material is PVDF, the molecular weight cutoff is 5000-6000, the flow rate is 40mg / L, the operating pressure is 0-0.1MPa, and the filtration method is suction filtration.

[0024] 3) Membr...

Embodiment 2

[0027] Embodiment 2: A method for treating landfill leachate, which includes the following steps:

[0028] 1) Pretreatment: The landfill leachate is firstly removed by the mechanical grid to remove the suspended matter and floating matter, and then the coagulant PAC and PAM are added to obtain the supernatant. The mechanical grille has the function of automatic slag cleaning, the grille gap is 5mm, and the grille angle is 45o. The dosage of coagulant PAC is 50mg / L, and the dosage of PAM is 4mg / L.

[0029] 2) Ultrafiltration: The supernatant is pumped into the ultrafiltration tank. After coagulation and precipitation in the ultrafiltration tank, the alum is retained by the ultrafiltration membrane to remove metals, SS and some organic matter. The ultrafiltration membrane adopts hollow fiber membrane, the membrane material is PVDF (polyvinylidene fluoride), the molecular weight cut-off is 5000-6000, the flow rate is 30mg / L, the operating pressure is 0-0.1MPa, and the filtration meth...

Embodiment 3

[0033] Embodiment 3: A method for treating landfill leachate, which includes the following steps:

[0034] 1) Pretreatment: The landfill leachate is firstly intercepted by mechanical grids to remove suspended solids and floating substances, and then coagulants PAC (polyaluminum chloride) and PAM (polyacrylamide) are added to obtain the supernatant. The mechanical grille has the function of automatic slag cleaning, the grille gap is 10mm, and the grille inclination angle is 75o. The dosage of coagulant PAC is 80mg / L, and the dosage of PAM is 3mg / L.

[0035] 2) Ultrafiltration: The supernatant is pumped into the ultrafiltration tank, and the alum is retained by the ultrafiltration membrane to remove metals, SS and some organic matter. The ultrafiltration membrane adopts hollow fiber membrane, the membrane material is PVDF (polyvinylidene fluoride), the molecular weight cut-off is 5000-6000, the flow rate is 50mg / L, the operating pressure is 0-0.1MPa, and the filtration method is suc...

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PUM

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Abstract

The invention discloses a treatment method of landfill leachate. The method comprises the following steps: removing suspended matters and floating matters in the landfill leachate by a mechanical grille, and adding PAC (polyaluminium chloride) and PAM (polyacrylamide) into the leachate to perform coagulation sedimentation and ultrafiltration treatment to remove metals, SS (sulindac sulfides) and partial organic matters in the leachate and reduce the treatment load of a follow-up membrane biological fluidized bed unit; then enabling the leachate after treatment to enter the membrane biological fluidized bed, maintaining the relatively high sludge concentration in the membrane biological fluidized bed, and performing biological treatment to remove soluble COD (chemical oxygen demand), BOD (biochemical oxygen demand) and ammonia nitrogen in the leachate; and finally removing the organic matters and salts, which are difficult to degrade, by a reverse osmosis membrane so as to realize up-to-standard emission of outlet water. The treatment method disclosed by the invention has the advantages of strong ability of being suitable for changes in water quality, high impact-resistant load, short treatment period, high treatment efficiency, good effect on removing pollutants, high removal rate of the COD, BOD and ammonia nitrogen of above 97%, small occupied area, high degree of automation and low cost.

Description

Technical field [0001] The invention relates to a waste water treatment method, in particular to a waste leachate treatment method. Background technique [0002] Landfill leachate refers to the black-brown-red liquid that leaks from the landfill due to fermentation, rainwater washing, washing, and surface water soaking during garbage stacking and landfilling. It is a high-concentration organic wastewater with very complex components, large changes in water quality and quantity, and a long duration of damage. It is one of the main factors that cause secondary pollution in the landfill process. Generally speaking, the pH of the landfill leachate is between 4-9, and the COD Cr In the range of 10000~40,000mg / L, BOD 5 In the range of 5000-8000 mg / L, the ammonia nitrogen is in the range of 1000-2000 mg / L. [0003] Due to the high pollution load of landfill leachate, it is difficult to treat. Not only the effectiveness and stability of the treatment project, but also the economic rationa...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 张建国刘彦奎刘军张爱均
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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