Leachate advanced treatment device and treatment method for domestic waste landfill

Abstract

The invention discloses a leachate advanced treatment device and treatment method for a domestic waste landfill. The device comprises a pH adjusting tank, a middle water tank, a first-stage multi-element catalytic oxidation device, a second-stage multi-element catalytic oxidation device, a coagu-flocculation reaction tank, a flocculation reaction tank and a settling pond. The middle water tank is communicated with the pH adjusting tank, the first-stage multi-element catalytic oxidation device is communicated with the middle water tank, the second-stage multi-element catalytic oxidation device is communicated with the first-stage multi-element catalytic oxidation device, the coagu-flocculation reaction tank is communicated with the second-stage multi-element catalytic oxidation device, the flocculation reaction tank is communicated with the coagu-flocculation reaction tank, and the settling pond is communicated with the flocculation reaction tank. The leachate advanced treatment device and treatment method have the advantages that advanced treatment is carried out on outflow water generated in waste leachate biochemical treatment through the technology, CODcr of the outflow water is lower than 100 mg / L and can meet the emission requirement in the domestic waste landfill pollution control standards (GB 16889-2008).

Description

technical field [0001] The invention relates to a leachate advanced treatment device and a treatment method of domestic waste landfill, belonging to the field of environmental engineering. Background technique [0002] Landfill leachate of domestic waste is a liquid containing organic or inorganic components produced during the landfill process of domestic waste due to physical, biological and chemical effects such as compaction and fermentation, as well as the seepage of precipitation and other external water. ; Its components are complex, the concentration of pollutants is high, the chroma is large, the toxicity is strong, the proportion of microbial nutrient elements is out of balance, and the water quality changes greatly with the age of the landfill, seasons, climate and many other factors; It is a high-concentration organic wastewater with complex components and difficult treatment. [0003] At present, the leachate of domestic waste landfills mostly adopts the treatm...

AI Technical Summary

Problems solved by technology

[0008] The main disadvantage of this technology is the inevitable problem of membrane concentrate disposal: since the organic matter in the leachate biochemical effluent is not really degraded and removed, but only concentrated, the refractory organic matter and total nitrogen in the produced large amount of membrane concentrate High in content and at the same time extremely salty, can only be disposed of by refilling to landfill or by energy-intensive processes such as incineration

Secondly, because the leachate entering the nanofiltration or reverse osmosis membrane contains a high concentration of organic matter, a large amount of organic matter will cause serious membrane fouling, frequent chemical cleaning, and seriously affect the normal service life of the membrane.

Secondly, due to the high salt content of landfill leachate, its nanofiltration or reverse osmosis concentration needs to be carried out under high pressure, which makes the membrane treatment system consume more energy.

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