Leachate pretreatment method
A technology of leachate and pretreatment, which is applied in contaminated groundwater/leachate treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. , Small footprint, stable and reliable performance
Pending Publication Date: 2022-04-05
山西青舟环境科技有限公司
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[0003] The fly ash of domestic waste incineration plants is hazardous waste, and its leachate contains heavy metal ions such as chromium, lead, and cadmium, which will affect the normal operation of the existing leachate treatment station, so it cannot directly enter the existing leachate treatment station in the site , must be preprocessed
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[0032] Such as Figure 1-Figure 3As shown, in a leachate pretreatment method provided by the present invention, the leachate from the fly ash landfill first enters the leachate adjustment tank, and is pumped to the collection tank 1 for homogeneity and quantity, so as to ensure the stable operation of the follow-up system, and then The lifting pump is lifted into the air flotation tank 2. Air flotation is to pass into the water or try to generate a large number of fine air bubbles to form a mixture of water, air and particles, so that the air bubbles are attached to the suspended particles. Float to the surface of the water to separate water and suspended solids, thereby purifying the wastewater while recovering useful substances in the wastewater. The water from the air floatation enters the reduction reaction tank 3 and then enters the neutralization reaction tank 4 to remove cadmium, chromium, lead, etc. For heavy metals, the process needs to add acid first to make the pH ≤...
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The invention discloses a leachate pretreatment method, which comprises the following steps: letting a leachate of a fly ash landfill enter a leachate adjusting tank, pumping the leachate to a collecting tank, lifting the leachate to an air floatation tank by a lifting pump, letting air floatation effluent enter a reduction reaction tank and then enter a neutralization reaction tank to remove cadmium, chromium, lead and other heavy metals, and in the process, adding acid to make the pH value less than or equal to 4, the method comprises the following steps of: adding an aluminum sulfate solution into a reaction tank to enable reaction conditions to be met, adding ferrous sulfate, adding lime milk to adjust the pH value to be 7.5-9.0, entering an advanced oxidation tank to carry out further oxidation removal, and finally entering a coagulative precipitation tank to carry out solid-liquid separation, adding a poly-aluminum-silicon medicament and ferroferric oxide into the coagulative precipitation tank, and filtering effluent of the coagulative precipitation tank by a sand filter, and the wastewater is finally discharged into a middle water tank for balancing water quality, and then is lifted by a pump to enter a balancing tank of the existing leachate treatment station. According to the method, the technical upgrading and reconstruction process difficulty of the conventional landfill leachate is effectively avoided, and meanwhile, a large amount of capital investment caused by technical upgrading and reconstruction is greatly reduced.
Description
technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a leachate pretreatment method. Background technique [0002] With the acceleration of urbanization in my country and the continuous improvement of the quality of life of residents, the amount of municipal solid waste is increasing year by year. During the treatment and disposal of municipal solid waste, a kind of high-concentration toxic organic wastewater with various pollutants and large changes in water quality and quantity is produced, called landfill leachate, which is a major problem in the field of wastewater treatment. Advanced oxidation technology (AOPs) uses light, electricity, catalysts, etc. to generate strong oxidizing free radicals (such as OH, SO4-, O2-, etc.) to degrade refractory organic pollutants in landfill leachate into small molecules, and even directly degrade into CO2 and H2O. Mainly according to the different types of strong oxidizing free rad...
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Login to View More IPC IPC(8): C02F9/04B01J23/89C02F1/72C02F101/20C02F103/06
Inventor 张弛尚博刘彦材刘朝陈琳
Owner 山西青舟环境科技有限公司