Treatment facility of landfill leachate and treatment method thereof

Abstract

Provided is a treatment facility of landfill leachate and a treatment method thereof. A reactor inlet of the facility is successively communicated with a sewage tank, a sodium sulfate storage tank, a ferric salt storage tank, and a pump. The sodium sulfate storage tank, a sodium hydroxide storage tank, and a draught fan are installed on the reactor. An outlet of the reactor is communicated with a sludge thickener and a clean water basin. The method includes the following steps: (1) in the stage of water inflowing, sewage, iron ion, and sodium sulfate are added in the reactor to be stirred and then sulfuric acid is added for adjusting potential of hydrogen (PH) value; (2) in the stage of reaction, power source is turned on, the reaction is conducted by blasting aeration, and the PH value is kept from 2.5 to 4.5 in reacting process; (3) in the stage of sediment, sodium hydroxide is added into the reactor, and the PH value is adjusted to 7-8 and then the sediment is precipitated; (4) in the stage of water discharging, liquid supernatant is discharged from a water decanter to the clean water basin and sedimentary sludge is discharged into the sludge thickener. Besides, all reaction stages are automatically controlled by a control room and reaction period is 4 hours to 6 hours. Hydrogen peroxide is continuously produced and divalent iron ions added in external forms electric Fenton reagents, and therefore organics are mineralized without secondary pollution and clean production is achieved.

Description

technical field [0001] The invention relates to a wastewater treatment device and a treatment method thereof, in particular to a landfill leachate treatment device including a sequencing batch electric Fenton reactor and a treatment method thereof, belonging to the field of high-energy oxidation treatment of landfill leachate in environmental chemistry. Background technique [0002] In recent years, due to the continuous expansion of the city scale, the urban domestic waste has continued to increase, the capacity and number of urban landfills have continued to expand, and the amount of landfill leachate produced daily has also continued to increase. Landfill leachate is a mixture of organic pollutants and heavy metal pollutants. It is a kind of high-concentration organic wastewater. It is characterized by difficulty in biodegradation. Therefore, how to effectively treat landfill leachate and make it meet the discharge standard , which becomes a technical difficulty. [0003...

AI Technical Summary

Problems solved by technology

One method is to add divalent iron ions and hydrogen peroxide to the sewage at the same time for Fenton reaction, which is oxidized to trivalent iron ions, which are reduced to divalent iron ions at the cathode and continue to participate in the reaction, but the addition of hydrogen peroxide increases the cost , and as the Fenton reaction continues, the concentration of hydrogen peroxide is consumed, and the treatment effect gradually weakens

Another method is to use iron as the anode to generate Fe 2+ , add hydrogen peroxide externally to form a Fenton system, but this will not only increase the cost by adding hydrogen peroxide, but also produce a large amount of anode slime, resulting in secondary pollution, and the treatment of anode slime has become a difficult problem

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