Landfill leachate multi-membrane treatment process

Abstract

The invention discloses a landfill leachate multi-membrane treatment process. Landfill leachate is pumped into an anaerobic tank, an anoxic tank and an aerobic tank in sequence for treatment, functional magnetic ferrite is put into effluent of the aerobic tank, and the effluent enters a sedimentation tank for solid-liquid separation; supernatant obtained from the sedimentation tank enters an immersed membrane reactor for secondary solid-liquid separation; sludge obtained from the sedimentation tank enters a magnetic drum separator for separation, and slurry containing the magnetic ferrite and returned sludge are obtained, wherein the slurry containing the magnetic ferrite flows back to enter the water outlet portion of the aerobic tank, and the returned sludge enters a middle tank; immersed membrane reactor permeate enters a tubular high-intensity magnetic field processor for magnetizing sterilization and then enters a nanofiltration or reverse osmosis system to be treated, and the treated immersed membrane reactor permeate is discharged up to standard; immersed membrane reactor concentrated mixed liquid is mixed with the returned sludge through the middle tank, and the supernatant is pressurized through a water pump and subjected to magnetic activation through a tubular medium-intensity magnetic field processor and then flows back to enter the anoxic tank.

Description

technical field [0001] The invention relates to a multi-membrane treatment process for landfill leachate, which can simultaneously increase treatment efficiency and improve membrane pollution, and belongs to the field of sewage treatment. Background technique [0002] Leachate is the product of gravity flow of liquid in a landfill, mainly from precipitation and waste, and its own embedded water. It has BOD 5 and high COD concentration (BOD 5 In the range of 600-45 000mg / L, COD in the range of 2 000-80 000mg / L), high metal content, large changes in water quality and quantity, high ammonia nitrogen content, and imbalance of microbial nutrient elements, etc., if not treated Direct discharge will lead to ecological deterioration and cause serious environmental pollution problems. Traditional landfill leachate treatment methods at home and abroad include: aeration stabilization pond, anaerobic biological filter, upflow anaerobic sludge bed, anaerobic-oxidation ditch-facultativ...

AI Technical Summary

Problems solved by technology

This further increases the cost of membrane depreciation, and also leads to a large amount of operations for workers and troublesome management and maintenance

[0007] In addition, there are currently domestic reports on the use of PTFE hollow fiber membranes to treat landfill leachate, but the price of PTFE hollow membranes is 3 to 5 times that of conventional PVDF hollow membranes or PVC hollow membranes

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