Method for treating GZBS garbage leachate

Abstract

The invention discloses a method for treating a GZBS garbage leachate. The method relates to two parts including a biochemical treating section and an advanced treating section, and comprises the following steps: (1) the garbage leachate reacts in a mixing tank and a rotary efficient biological reactor in sequence, then enters a gradient biochemical aeration tank and a settling tank; (2) water passing through the settling tank enters a primary Fenton reaction tank while a composite Fenton reagent and oxydol are added into the primary Fenton reaction tank; after reaction, the water enters a secondary Fenton reaction tank after passing through a first neutralization reaction tank, the settling tank and a primary biological aerated filter; (3) a composite Fenton reagent and the oxydol are added into the secondary Fenton reaction tank, and the garbage leachate is discharged after passing through a second neutralization reaction tank, the settling tank and a secondary biological aerated filter. The method is mainly applied to garbage leachate generated in a domestic waste sanitary landfill and a refuse burning (power generation) plant.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a method for treating GZBS garbage leachate. Background technique [0002] Landfill leachate treatment is a recognized problem at home and abroad, especially the implementation of the new standard "GB16889-2008" "Standards for Pollution Control of Domestic Waste Landfill Sites", which puts forward higher requirements for the treatment of landfill leachate. Landfill leachate treatment technology has been developed for many years. At present, the mainstream treatment process recognized in the industry is "biochemical + MBR" in the front stage, and "nanofiltration or reverse osmosis" in the back stage. The front-end biochemical process mainly uses A2 / O, and MBR has mostly been in the form of external membranes in recent years; the back-end "nanofiltration or reverse osmosis" basically uses DTRO membranes or roll membranes. [0003] The existing domestic landfill leachate treatment ...

AI Technical Summary

Problems solved by technology

[0003]The existing domestic landfill leachate treatment technology mainly has the following problems: (1) High energy consumption: landfill leachate is characterized by TN and NH3-N is high, A2 / O biochemical treatment denitrification technology and theory are based on low concentration TN and NH3-N, for high concentration TN and NH3 sub>-N adopts A2 / O system to denitrify, which lacks a mature system theory. In engineering, it is more based on low-concentration TN and NH3-N theory

At the same time, according to the traditional theory, more than 3g of oxygen is required to remove 1g of nitrogen, so the energy consumption of the biochemical system is extremely high.

(2) Difficulty in operation: A (anaerobic denitrification) and O (aerobic nitrification) units in A2 / O technology have very different operating conditions

Since there is no sludge sedimentation tank in the A2 / O technology, in actual operation, the microorganisms in the A section will enter the O section with the sewage, and the O section microorganisms intercepted by the MBR (Membrane Bio-Reactor) will enter the A section through reflux, so the existing system Difficult to run efficiently in each segment

In addition, in A2 / O technology, sewage temperature, alkalinity, organic carbon concentration and dissolved oxygen concentration will all affect the stable operation of the system and the treatment effect

For this reason, it is extremely difficult to realize the stable operation of the biochemical system in actual engineering.

(3) Carbon source needs to be supplemented: overall carbon-nitrogen ratio of landfill leachate is out of balance

(4) Pollution transfer: Nanofiltration or reverse osmosis is essentially a pollutant concentration process. At present, most of the pollutants intercepted by nanofiltration or reverse osmosis are disposed of by spraying the concentrated solution back to the landfill. Theoretically, , the residual pollutants have not been effectively decomposed

Although relevant technicians are currently looking for a thorough treatment technology for concentrated liquid, there are still some problems in its cost and operation mode in the actual application process

(5) High cost of membrane replacement: As a membrane separation technology, it is necessary to replace the membrane after a period of use

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