Treatment process of refuse landfill closure leachate

Abstract

The invention discloses a treatment process of refuse landfill closure leachate. The treatment process of the refuse landfill closure leachate comprises the following steps: collecting leachate; treating the leachate by an advanced oxidation electro-Fenton reactor to obtain primary treatment liquid and primary sludge, and inputting the primary sludge into a sludge adjusting tank; denitriding the primary treatment liquid by AO-MBR membrane integrated biological denitriding equipment to obtain secondary treatment liquid and secondary sludge, and inputting the secondary sludge into the sludge adjusting tank; and inputting the secondary treatment liquid into an artificial wetland to perform treatment, and discharging after the artificial wetland. Compared with the prior art, the treatment process of the refuse landfill closure leachate has the following advantages: an advanced oxidation electro-Fenton method serves as a pretreatment process of landfill leachate, so the ammonia nitrogen content and the total nitrogen content can be reduced and the living property of waste water can be improved; the treatment process adopts the AO-MBR membrane integrated biological denitriding equipment,so ammonia nitrogen can be efficiently removed and activated sludge can be intercepted efficiently; and advanced treatment adopts the environmentally-friendly artificial wetland, so part of pollutants can be absorbed and the ecological environment can be beautified.

Description

technical field [0001] The invention relates to a treatment process, in particular to a treatment process for landfill leachate closure. Background technique [0002] Landfill leachate is a kind of high-concentration organic wastewater leached out due to material fermentation, rainwater washing and groundwater soaking in the process of garbage stacking and landfilling. Its water quality is complex and the environment is harmful. [0003] The composition of landfill leachate varies greatly depending on the region, industry, and landfill time. COD (Chemical Oxygen Demand, chemical oxygen demand) and ammonia nitrogen also vary greatly. COD can reach 90,000mg / L, and ammonia nitrogen can reach 1700mg / L, and has a bad smell, which increases the difficulty of operation. [0004] At present, the methods of treating landfill leachate mainly include recharge method, biological treatment method, physical and chemical treatment method and land treatment method. Although the recharge ...

AI Technical Summary

Problems solved by technology

However, the maintenance and replacement of membrane modules are frequent, difficult to clean, easy to clog, large fluctuations in processing capacity, and high operating costs. At the same time, the concentrated water generated by membrane treatment is difficult to treat and is prone to secondary pollution.

[0005] Therefore, the existing various landfill leachate treatment equipment has poor treatment capacity and low efficiency, and the COD, ammonia nitrogen and total phosphorus in the effluent water cannot meet the discharge standards or have secondary pollution.

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