Treatment method of landfill leachate

Abstract

The invention relates to a treatment method of landfill leachate. Pretreatment is performed through anaerobic treatment, aerobic treatment and a membrane bioreactor, and organic pollution ingredients which are easy to biodegrade are sufficiently degraded at a lower cost; deep degradation treatment is performed through a photoelectric Fenton reaction, and pollution ingredients which are difficult to biodegrade are sufficiently and quickly degraded; hydrogen peroxide is continuously produced through a gas diffusion electrode so as to maintain the Fenton reaction; the production efficiency of the hydrogen peroxide is improved by using 2-ethyl-anthraquinone as a catalyst; the regeneration of ferrous ions is ensured by using ultraviolet rays for illumination, and the Fenton reaction is circularly performed. The medicament cost is reduced, sludge containing iron is hardly produced, a membrane separation technology is not used in a final treatment link, organic waste is efficiently degraded and discharged, a concentrated solution cannot be produced, and the cost is far lower than that by using a membrane separation technology.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a combined treatment method for landfill leachate. Background technique [0002] The harmless treatment of municipal waste is a major problem worldwide, and the treatment of landfill leachate is even more urgent. Landfill leachate is a secondary pollutant produced along with landfill, which mainly comes from precipitation and the water contained in the waste itself, and its properties will change greatly with the operation time of the landfill. [0003] Landfill leachate is a high-concentration wastewater with complex components, containing a large amount of organic matter, inorganic ions, and heavy metal ions. The apparent color is dark brown and accompanied by an unpleasant smell. The water quality of landfill leachate has the following characteristics: (1) The composition is complex. The leachate contains substances leached from different types of garbage, and hundreds of org...

AI Technical Summary

Problems solved by technology

(2) High concentration of organic pollutants

(3) High content of ammonia nitrogen and heavy metals

Compared with other methods, the effluent treated by this method is cleaner, but it has the following disadvantages: First, the treatment process is only a purely physical separation process, which cannot really remove organic matter, and will form a concentrated solution that is difficult to handle; The physical and chemical properties of the treatment object (such as the concentration of suspended particles) are strictly required, the equipment and operating costs are high, and the membrane modules need to be replaced frequently, etc.

However, the traditional Fenton technique has many disadvantages, including the reaction reagent H 2 o 2 The cost is high, the transportation is dangerous, the dosage of Fenton reagent is large, and a large amount of iron-containing sludge that is difficult to handle is formed after the wastewater is treated.

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