Resource and energy utilization method of garbage leachate

Abstract

The invention discloses a resource and energy utilization method of garbage leachate. The resource and energy utilization method of the garbage leachate comprises the following steps of (1) placing the leachate in a reaction tank with a stirrer, adjusting a pH value to be 6-7, conducting stirring, adding an oxidizing agent, carrying out an oxidation reaction, then adding a heavy metal ion sediment curing agent, carrying out a curing reaction, and filtering out sediment to obtain a mixture of an organic acid and an organic acid salt; (2) adding a functional catalyst element compound into the mixture obtained in the step (1), conducting stirring, and carrying out a reaction to obtain an organic acid salt catalytic oxidation promoter; and (3) using the organic acid salt catalytic oxidation promoter obtained in the step (2) for clean combustion of domestic garbage or for clean combustion of dewatered sludge of a garbage incineration power plant or for clean combustion of domestic garbage, mixed with sludge, of the garbage incineration power plant or for clean combustion of fire coal. The method is simple and easy to implement, the problems that leachate and concentrate of the leachate are hard to degrade, and the like can be effectively solved, and resource and energy utilization of the leachate is achieved.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a method for utilizing garbage leachate as a resource and energy. Background technique [0002] my country's urban domestic waste has a lot of kitchen waste, high moisture content, and low calorific value. When disposing of urban domestic waste in waste incineration power plants, fresh waste must be stored in the waste storage pit for 3 to 7 days for fermentation and maturation, that is, let the living The organic matter in the garbage is decomposed, fermented, liquefied and leached to the bottom of the storage pit to achieve the purpose of leaching out water and increasing the calorific value, so as to ensure the normal operation of the subsequent incinerator. In the "Standards for Pollution Control of Domestic Garbage Incineration" (GB18485-2001), the water leached out in this process is called "leachate", which is characterized by high pollutant concentration, large changes in w...

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Problems solved by technology

[0007] 3) Biochemical treatment method: The process of removing the main pollutants in the leachate by biochemical treatment is currently researched more on ammonia stripping + UASB + SBR, and on this basis, ozone oxidation, coagulation and other processes are added, which are more typical It adopts coagulation + ammonia stripping + pH correction + anaerobic filter + SBR + ozone disinfection, but the process based on biochemical method has a poor treatment effect on leachate, and the degradation ability of microorganisms to high-concentration pollutants in leachate is very low , and the ammonia blown out brings secondary pollution;

[0008] 4) Chemical oxidation treatment method: such as using Feton reagent oxidation + ammonia stripping + coagulation precipitation + anaerobic + SBR + ClO 2 Oxidation + activated carbon adsorption process to treat leachate, this process actually mainly relies on chemical oxidants and activated carbon adsorption to remove pollutants, the operating cost is high, and there is actually secondary pollution;

[0009] 5) CTB process treatment method: that is, the method of "coagulation + low-temperature multi-effect evaporation + ammonia stripping + biochemical treatment" can be used to treat the garbage leachate to the national secondary emission standard, but it consumes a lot of energy and produces secondary pollutants. secondary pollution;

[0010] 6) Other methods: There are also catalytic oxidation methods, electro-oxidation methods, photo-oxidation methods, wet oxidation methods, etc. These methods have poor industrial practicability either because the catalyst is easily poisoned or because the power consumption is too large.