Efficient biodegradation and low concentration landfill leachate treatment process and treatment system thereof

Abstract

The invention discloses an efficient biodegradation and low concentration landfill leachate treatment process and a treatment system thereof. The treatment system comprises a regulating tank, a No.1 MBR (Membrane Bioreactor), a concentrated water tank, a two-segment NF / RO membrane filtration device, electric Fenton equipment, a No.2 MBR, a sterilization and filtration device, a water production tank, No.1 primary and secondary A / O treatment devices, primary and secondary RO membrane filtration devices, and No.2 primary and secondary A / O treatment devices. An NF membrane device in the traditional process is replaced by a primary RO membrane filtration device to ensure that secondary RO can produce water which is up to standard for a long time. Moreover, the two-segment NF / RO membrane filtration device can intercept and separate refractory organic matters and effectively increase the proportion of biodegradable organic matters entering a No.2 biochemical reaction process. Water producedby the two-segment membrane device is oxidized through the electric Fenton equipment, so that the biodegradability of the leachate is enhanced, the concentration of soluble salts in the conventional system is avoided, the recharge quantity of concentrated water in the system is reduced, and a good water treatment effect is achieved.

Description

technical field [0001] The invention relates to the technical field of leachate treatment, in particular to a high-efficiency biochemical low-volume enrichment landfill leachate treatment process and a treatment system thereof. Background technique [0002] The "middle aged" landfill leachate produced by garbage in long-term landfill is currently recognized as refractory wastewater. The water quality characteristics of middle-aged and old landfill leachate are as follows. [0003] High concentration of organic matter: BOD in leachate 5 And CODcr concentration is usually between 1000mg / l~10000mg / l, PH is slightly alkaline, BOD 5 / CODcr is between 0.1 and 0.3, and the biodegradability is poor. [0004] High metal content: landfill leachate contains a variety of metal ions, such as: copper, iron, arsenic, zinc, lead, chromium, cadmium, mercury, etc. The content is between a few micrograms and tens of milligrams. [0005] High ammonia nitrogen content: With the increase of ...

AI Technical Summary

Problems solved by technology

During the operation of the water treatment system, the enrichment of total soluble salts is prone to occur, and it is easily affected by a large amount of heavy metal ions, a large amount of refractory organic matter, and high ammonia nitrogen, resulting in a biochemical residence time of more than ten days, resulting in the system The work is unstable, it is difficult to achieve standard discharge, and it is prone to the situation that the final product water quality of the system does not meet the standard

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