Leachate treatment method suitable for small and medium-sized refuse transfer stations

Abstract

The invention relates to a leachate treatment method suitable for small and medium-sized refuse transfer stations, which comprises the following steps of: filtering refuse leachate by using a grid to remove massive refuse; adjusting the pH to 6.5-7.5; carrying out electro-catalysis ozone micro-aeration air flotation modification and deslagging; removing nitrogen through denitrification, and biochemically degrading organic matters; carrying out deep treatment, and recycling or discharging the treated wastewater; recharging the sludge into the garbage heap, compressing and then transferring the product out along with the station body. According to the treatment method disclosed by the invention, the use of chemicals is reduced as much as possible while the treatment quality of the landfill leachate of the transfer station is ensured, unnecessary processes and equipment are reduced, and the treatment investment, operation and maintenance costs of the landfill leachate of the transfer station are reduced to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method suitable for leachate treatment of small and medium-sized garbage transfer stations. Background technique [0002] A certain amount of landfill leachate will be produced during the process of compressing and transporting domestic waste at the waste transfer station. According to relevant reports, the leachate discharge of the waste transfer station accounts for about 11% of the total waste, of which the waste compressed liquid accounts for 6% of the total. , other wastewater accounted for 5% of the total, and the landfill leachate at the transfer station showed high COD cr , high ammonia nitrogen, high oil, high suspended solids, high concentration of pollutants, and difficult treatment. According to the "Technical Specifications for Domestic Garbage Transfer Stations" (CJJ 47-2016), "Rainwater and domestic sewage should be considered as connected to the munici...

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Problems solved by technology

[0004] The leachate of the transfer station has the characteristics of small output and dispersion, which often makes it difficult to effectively recover and utilize the biogas produced by its anaerobic biochemistry. Even if it is utilized, it will be difficult to produce economic benefits due to the increase in engineering and maintenance costs. At the same time, the biogas produced after anaerobic treatment is flammable and explosive. The location of the garbage transfer station is usually close to residential areas and downtown areas, and there are a large number of sanitation transport vehicles entering and leaving. The direct combustion of biogas or the reuse of biogas collection Certain potential safety hazards and the possibility of secondary pollution of exhaust gas (hydrogen sulfide, sulfur dioxide, etc.), so the application of anaerobic treatment technology in garbage transfer stations is limited;

[0005] In the conventional landfill leachate treatment process, the double-membrane treatment process of ultrafiltration and reverse osmosis is mostly used, which can stabilize the effluent water quality; The filtrate will produce 30%~40% concentrated liquid, and the evaporation and crystallization equipment and operating costs of the concentrated liquid are relatively high, and most of the evaporation equipment is prone to fouling and corrosion; therefore, there is an urgent need for a safe, effective, low-cost Low-cost transfer station leachate treatment technology to replace the mainstream double-membrane treatment process

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