Leachate treatment process for waste transfer station

Abstract

The invention discloses a garbage transfer station leachate treatment process which comprises a mechanical grating well, an oil separation sedimentation tank, a water collecting tank, a high-efficiency sedimentation tank, an adjusting tank, an A / O tank, an external MBR system and an advanced oxidation reactor which are sequentially connected, and the oil separation sedimentation tank, the high-efficiency sedimentation tank and the external MBR system are all communicated with a stacked screw sludge dewatering system. And the external MBR system and the advanced oxidation reactor are both communicated with the standard discharge port. Concentrated sludge in the oil separation sedimentation tank and the efficient sedimentation tank is pumped into the sludge tank of the stacked-screw sludge dewatering system at regular time through the water pump, the sludge tank also receives part of concentrated liquid separated by the external MBR, the concentrated liquid is homogenized through aeration stirring arranged in the tank, then the concentrated liquid is pumped into the stacked-screw dewatering machine through the water pump, and a flocculating agent automatic dosing device is matched, so that the sludge dewatering effect is improved. The cation PAM is injected into the conditioning tank of the stacked screw machine, the sludge is concentrated and dehydrated through the stacked screw machine, and the dehydrated sludge cake is transported outwards in a unified manner.

Description

technical field [0001] The invention relates to a leachate treatment process, which is used for treating leachate wastewater in a garbage transfer station, and belongs to the technical field of sewage treatment. Background technique [0002] In recent years, with the rapid advancement of my country's urbanization process and the implementation of garbage classification, the output of domestic wet garbage is increasing day by day. In view of our country's unique eating habits, after the implementation of garbage classification, domestic wet garbage carries a lot of water, grease and other substances. The garbage transfer station currently implemented in my country is an important intermediate link for garbage collection and disposal. During the compression and transfer of domestic garbage in the transfer station, a large amount of production and domestic sewage and wastewater will be generated. The main components are landfill leachate, flushing wastewater and domestic sewage...

AI Technical Summary

Problems solved by technology

[0003] The traditional leachate process of the garbage transfer station often chooses the process of air flotation + A / O-built-in MBR membrane tank, and the sludge is processed by a plate and frame filter press, which has the following defects: 1. The leachate of the transfer station often contains relatively high There are many large particles of impurities and suspended solids. Although the use of air flotation devices can integrate chemical coagulation and oil removal functions, it is difficult for large volume impurities to float up with micro-bubbles. Long-term operation will easily lead to blockage of the air flotation jet device, thereby affecting the treatment effect. ;2. Due to its structural characteristics, the built-in MBR membrane system needs to be immersed in sewage, which is easy to be polluted, blocked or even broken during operation; 3. Due to the large amount of particulate matter, organic matter and grease in the leachate of the transfer station, the resulting sludge properties The fluctuation is large, and the high oil is likely to cause blockage of the filter cloth of the plate and frame filter press, resulting in poor sludge dewatering effect

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