Treatment method and treatment system for percolate in garbage-burning plant

Abstract

The invention relates to a treatment method and a treatment system for percolate in a garbage-burning plant. The treatment method for garbage-burning percolate includes the steps as follows: the percolate is collected by a pipeline and then enters a coarse grating, a fine grating and a sand setting tank to be subjected to sand setting, and then flows into an adjusting tank for mixing and stirring; effluent of the adjusting tank is lifted to a settling tank by a lift pump of the adjusting tank; by adjusting pH value and adding coagulant, the effluent of the adjusting tank is coagulated and settled so as to remove most water suspended matters and part of insoluble organic matters; the effluent of the settling tank flows into a middle water tank and is heated by a steam-jet heating system to 35 DEG C; and the heated effluent of the middle water tank is subjected to biochemical treatment. In the invention, a pre-treatment unit is arranged in front of the adjusting tank, thus reducing the load of follow-up units and simultaneously prolonging the cleaning period of the adjusting tank; and an MBR (Meane Biological Reactor) system is adopted for effectively intercepting activated sludge to further improve the effect of a biochemical treatment unit, and simultaneously a secondary settling tank in a traditional biochemical treatment technology is replaced and the operation is simplified.

Description

technical field [0001] The invention belongs to the field of garbage pollutant treatment for environmental protection, and in particular relates to a method and system for treating leachate of a garbage incineration plant. Background technique [0002] Leachate is the sewage leached out of the garbage due to the decay, deterioration and fermentation of organic matter of animals and plants. It usually has a foul smell, and its main component is NH 3 -N, BOD, CODCr, SS (abbreviation for Suspended Substance in English, that is, suspended matter in water quality), Cl － and other filth. The main sources of leachate in waste incineration plants are the water contained in the waste itself that is squeezed out during the process of stacking the waste in the storage pit and the water generated by the local anaerobic fermentation of the organic components in the waste in the storage pit. It is a high-concentration organic wastewater with complex components. In addition, during the r...

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Problems solved by technology

[0008] (3) High concentrations of calcium and magnesium

[0010] (4) Malnutrition ratio

[0011] This is similar to the characteristics of landfill leachate. Generally, leachate contains high concentrations of COD and ammonia nitrogen, but low phosphorus content. Therefore, if it is not adjusted, it will greatly affect the effect of biochemical treatment.

[0012] In the prior art, the treatment methods for leachate treatment in landfills have been relatively mature. In view of the difference in water quality between leachate in waste incineration plants and leachate in landfills, the leachate treatment technology in waste incineration plants has also been developed accordingly. Some waste incineration plant leachate treatment technologies generally have relatively complicated process control and relatively high investment costs

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