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Treatment of landfill leachate by fenton method combined with supercritical water oxidation

A technology for supercritical water oxidation and landfill leachate, applied in the field of environmental science, can solve the problems of high requirements on reactor material, difficult to large-scale industrial application, high power consumption, etc., and achieve the effects of suitable cost, rapid response and cost saving

Inactive Publication Date: 2015-12-02
GUIZHOU ACAD OF ENVIRONMENTAL SCI & DESIGNING
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Problems solved by technology

Fenton's reagent method, due to H 2 o 2 Due to the high cost limit of reagents, it is difficult to put them into large-scale industrial applications. At present, they are generally used for wastewater pretreatment and advanced treatment; because supercritical water oxidation is reacted under special high temperature and high pressure conditions, the requirements for reactor materials High, high power consumption is its main limitation

Method used

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  • Treatment of landfill leachate by fenton method combined with supercritical water oxidation
  • Treatment of landfill leachate by fenton method combined with supercritical water oxidation
  • Treatment of landfill leachate by fenton method combined with supercritical water oxidation

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Embodiment 1

[0015] Embodiment 1 of the present invention: Fenton method combines supercritical water oxidation method to process landfill leachate, comprises the following steps:

[0016] 1) Landfill leachate with COD of 2000-30000mg / L and salinity less than 5%, adjust the pH of the landfill leachate to 4, add hydrogen peroxide and ferrous sulfate, the molar ratio of hydrogen peroxide and ferrous sulfate is 4:1, Use the Fenton method to pretreat the landfill leachate, react for 2 hours, adjust the pH to 8 to terminate the reaction, and let it settle for 1 hour;

[0017] 2) Take the supernatant after static precipitation in step 1) and enter the supercritical water oxidation system, using copper nitrate as the catalyst, after adding copper nitrate, Cu 2+ The concentration is 45mg·L -1 , Hydrogen peroxide is added to the reactor according to 3 times the theoretical oxygen demand of the landfill leachate, and the temperature is controlled at 440°C and the pressure is 26MPa to react for 4 mi...

Embodiment 2

[0021] Embodiment 2: the Fenton process of landfill leachate, reaction condition: pH=4, n (H 2 o 2 ): n (Fe 2+ )=4:1, the reaction time is 2h, the results are shown in Table 2:

[0022]

Embodiment 3

[0023] Example 3: Supercritical water oxidation treatment of landfill leachate, reaction conditions: temperature 500°C, pressure 26MPa, oxidant ratio K 3.0, copper ion concentration 45mg L -1 , the results are shown in Table 2:

[0024]

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Abstract

The invention discloses a process for treating landfill leachate through a Fenton method and a supercritical water oxidation method, which comprises the following steps: pretreating landfill leachate through a Fenton method, and performing advanced treatment on the pretreated landfill leachate through a supercritical water oxidation method, thus realizing purification of the landfill leachate after the reaction is completed. According to the invention, the COD (chemical oxygen demand), ammonia nitrogen, chroma and other pollutants in the landfill leachate can be efficiently removed, the pollutants can be thoroughly treated, the reaction is quick, and the effluent water is colorless and transparent. By accounting according to treatment cost, when 1 ton of COD is removed on average, the treatment process combining the Fenton method and the supercritical water oxidation method saves 15-25% of operating cost in comparison with single use of the supercritical water oxidation method. Thus, the process disclosed by the invention has extremely wide application prospects.

Description

technical field [0001] The invention relates to the field of environmental science, in particular to a Fenton method combined with a supercritical water oxidation method for treating landfill leachate. Background technique [0002] The harmless treatment technology of landfill leachate has always been a problem that plagues various landfills at home and abroad. If it is not handled properly, it will cause serious pollution to the surrounding environment, underlying soil and groundwater of the landfill. At present, the treatment of landfill leachate at home and abroad mainly includes chemical oxidation, chemical coagulation, activated carbon adsorption, reverse osmosis, photooxidation, catalytic electrolytic oxidation and other methods. However, these methods cannot remove pollutants completely efficiently and economically, and there are still many problems in practical application. Research and development of high-efficiency treatment technology for landfill leachate is a h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 董泽琴张维李晶晶申哲民潘军
Owner GUIZHOU ACAD OF ENVIRONMENTAL SCI & DESIGNING
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