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Method for treating landfill leachate tail water through magnetic carbon catalyzed ozonation

A technology of landfill leachate and ozone oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc. It can solve the problem that the effluent quality is difficult to meet the discharge standard, the energy consumption of adsorbent regeneration is large, and the one-time investment The problem of high cost is to solve the problem of adsorbent regeneration and secondary pollution, and to improve the removal capacity.

Inactive Publication Date: 2012-07-18
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
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Problems solved by technology

Among them, although the treatment effect of membrane separation technology is better, its one-time investment cost is high, the technical difficulty is relatively large, the cleaning of the membrane system is difficult, the water demand for backwashing is large, the membrane life is short, and there are also problems with the treatment of concentrates. Problem: The adsorption method only transfers the pollutants from the water phase to the solid phase, but cannot completely remove them, which is easy to form secondary pollution, and the regeneration energy of the adsorbent is large
Although the ozone oxidation method can oxidize and remove the organic matter in the wastewater, due to the strong anti-oxidation ability of the refractory humus and other organic matter in the tail water, the ozone oxidation method alone still has the disadvantages of slow oxidation rate, low utilization efficiency, and difficulty in complete mineralization. Defects such as pollutants lead to limited removal of organic matter, and the quality of effluent water is difficult to meet the discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: (method 1 of magnetic carbon catalytic ozone oxidation treatment landfill leachate tail water)

[0024] The method proceeds as follows:

[0025] (1) Biological pretreatment of landfill leachate: After treating the landfill leachate collected by UASB (upflow anaerobic sludge bed)-MBR (aerobic membrane bioreactor) two-stage combined process, the tail water The COD is 280 mg / L, after the chroma is 70 times, it is ready for use;

[0026] (2) Preparation of magnetic carbon catalyst: After preparing ferrous nitrate and manganese nitrate solutions with a concentration of 0.5mol / L respectively, the ferrous nitrate solution and manganese nitrate solution are mixed into an impregnation solution in a volume ratio of 50L: 100L; The granular activated carbon passed through a 15-60 mesh sieve is mixed with the impregnating solution according to the mass volume ratio of 15kg:150L, ​​and impregnated for 24 hours, the solid phase components are removed and rinsed with dei...

Embodiment 2

[0028] Embodiment 2: (method 2 of magnetic carbon catalytic ozone oxidation treatment landfill leachate tail water)

[0029] In this example, the biological pretreatment of step (1) landfill leachate: the COD of the tail water after treatment is 160 mg / liter, and after the chroma is 50 times, it is standby; the preparation of step (2) magnetic carbon catalyst: ferrous nitrate and manganese nitrate in the volume ratio of 50L:50L to form an impregnating solution; the granular activated carbon and the impregnating solution were mixed in a mass volume ratio of 15kg:100L, and soaked for 24 hours, then fished out and rinsed with deionized water for four times, and filtered in Dry at 115°C to constant weight; put it into a muffle furnace and roast at 400°C for 6h to obtain a magnetic carbon catalyst; step (3) catalytic ozone oxidation treatment: mix the magnetic carbon catalyst with ozone and the landfill leachate tail water of step (1) 1.5kg by mass volume: 15g / min: 1000L ratio drop...

Embodiment 3

[0030] Embodiment 3: (method 3 of magnetic carbon catalytic ozone oxidation treatment landfill leachate tail water)

[0031] In this example, the biological pretreatment of step (1) landfill leachate: the COD of the tail water after treatment is 230 mg / liter, and after the chroma is 80 times, it is standby; the preparation of step (2) magnetic carbon catalyst: ferrous nitrate and manganese nitrate solution in the volume ratio of 100L: 50L to form an impregnating solution; the granular activated carbon and the impregnating solution were mixed in a mass volume ratio of 30kg: 150L, ​​immersed for 24 hours, removed and rinsed with deionized water for 5 times, and filtered in Dry at 105°C to constant weight; put it into a muffle furnace and roast at 500°C for 4h to obtain a magnetic carbon catalyst; step (3) catalytic ozone oxidation treatment: mix the magnetic carbon catalyst with ozone and the landfill leachate tail water of step (1) 2kg by mass volume: 20g / min: 1000L ratio drops...

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Abstract

The invention discloses a method for treating landfill leachate tail water through magnetic carbon catalyzed ozonation, which belongs to the technical field of treatment of environmental waste. The method comprises the following steps: (1) biological treatment of landfill leachate; (2) preparation of a magnetic carbon catalyst; (3) catalysis of ozone for oxidation treatment; etc. According to the invention, the magnetic carbon catalyst is added, and adsorption performance and catalytic characteristics of the catalyst are fully utilized; therefore, under the synergism of adsorption and catalyzed ozonation, effluent reaches national discharge standards that COD is no more than 100 mg / L and chroma is no more than 40 times, and through utilization of the magnetic characteristics of a magnetic carbon material, the problems of separation, recovery and reutilization of the catalyst are overcome. The method provided in the invention can be popularized and applied in in-depth treatment of household garbage leachate tail water in town regions.

Description

technical field [0001] The invention relates to the technical field of environmental waste treatment, in particular to an advanced treatment method for landfill leachate tail water. Background technique [0002] Landfill leachate has complex components, high organic content, deep color and odor, high chemical oxygen demand (COD), and biochemical oxygen demand (BOD 5 ) is relatively low and has poor biodegradability. At present, most of the treatment of landfill leachate in my country still adopts the traditional secondary process of pretreatment + aerobic biological treatment. Due to the limited ability of conventional biological treatment to treat toxic, harmful and refractory organic matter, the effluent after general biological treatment (also known as life The content of organic matter in landfill leachate tail water) is still high (COD is as high as hundreds of mg / L), while BOD 5 / COD is very low, and the ratio of C:N:P is seriously out of balance, it is extremely diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/20B01J23/889C02F9/14C02F1/78
Inventor 肖华喻曼许育新奚辉景金富陈喜靖安文浩陈晓旸
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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