A method for resource utilization and energy utilization of garbage leachate

Abstract

A method for recycling waste leachate into energy, comprising the following steps: (1) placing the leachate in a reaction tank with a stirrer, adjusting the pH value to 6-7, stirring, adding an oxidant, generating an oxidation reaction, and then , adding a heavy metal ion precipitation curing agent, a curing reaction occurs, and the precipitate is filtered off to obtain a mixture of organic acid and organic acid salt; (2) adding a functional catalyst element compound to the mixture obtained in step (1), stirring, and reacting, The organic acid salt catalytic oxidation accelerator is obtained; (3) the organic acid salt catalytic oxidation accelerator obtained in step (2) is used for the clean combustion of domestic waste, or for the clean combustion of dewatered sludge in a waste incineration power plant; or for Clean combustion of domestic waste mixed with sludge in waste incineration power plants; or for clean combustion of coal. The method of the invention is simple and easy to implement, can effectively solve the problems that the leachate and its concentrate are difficult to degrade, and realize the utilization of resources and energy.

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...

AI Technical Summary

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.