Garbage percolate treatment technique

Abstract

The invention discloses a technology for treating landfill leachate, which comprises the steps of pretreatment, upflow type sludge bed reaction, nitrification and denitrification reaction, mud-water separation and membrane treating. The technology for treating landfill leachate treats the landfill leachate by comprehensively using physics and biochemistry method, which largely reduces the cost for treating the leachate, simultaneously promotes effluent water quality at large amplitude, and can be widely used for treating landfill leachate in a waste treatment plant.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a technique for treating garbage leachate. Background technique [0002] Municipal landfill leachate is a kind of high-concentration organic wastewater with complex components. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. Different from general urban sewage, the BOD of landfill leachate 5 And CODcr concentration is high, metal content is high, water quality and water quantity change greatly, the content of ammonia nitrogen is high, the ratio of microbial nutrient elements is out of balance, etc. In our country, with the increase of urban population, the expansion of urban scale and the improvement of residents' living standards, the output of urban domestic waste in our country is increasing sharply. A large number of domestic waste incineration power plants have been newly built, and whether the l...

AI Technical Summary

Problems solved by technology

This is mainly due to the fact that the leachate pH must be adjusted to about 11 before blowing off during operation, and the pH needs to be adjusted back to neutral after blowing off to meet the needs of biochemistry, so a large amount of acid and alkali must be added during operation To adjust the pH, in order to provide a certain gas-liquid contact area, the fan is also required to provide sufficient air volume to meet a certain gas-liquid ratio, resulting in high leachate treatment costs

[0007] In addition, for areas with low annual average temperature, the air stripping method has the problems that the stripping cannot operate normally under low temperature conditions and the stripping tower freezes in winter. In northern China, its application is limited to a certain extent.

[0008] Although the method of steam stripping can better solve the problem of ammonia nitrogen removal, the treatment cost is still high due to the need to increase the water temperature of the leachate

[0009] 2) Some organic substances are difficult to biodegrade

[0010] Although the biodegradability of leachate is good, it is difficult to treat it below the second-level or even first-level standard by biological treatment alone. Generally speaking, nearly 500-600mg / L of COD in leachate cannot be treated by biological treatment. deal with

In today's world, researchers of domestic waste leachate treatment technology have reached a consensus: from the perspective of win-win ecological and economic benefits, biochemical process is an indispensable pretreatment stage in the process of leachate treatment, but only relying on the biochemical stage cannot meet the requirements. Strict effluent requirements must be rationally optimized and combined with other processes

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