Garbage leachate nanofiltration concentrated solution secondary reduction membrane filtration concentrated solution treatment method

Abstract

The invention relates to a garbage leachate nanofiltration concentrated solution secondary reduction membrane filtration concentrated solution treatment method, which comprises the following steps of:(1) feeding raw water of secondary reduction membrane filtration concentrated solution into a raw water stirring tank, adding a softener, a flocculating agent and a coagulant aid and stirring for softening and coagulation sedimentation treatment; (2) adding primary clear liquid in a clear liquid collecting tank into a primary Fenton reactor for primary Fenton oxidation treatment; (3) adding secondary clear liquid into a secondary stirring tank of a secondary Fenton reactor for secondary Fenton oxidation treatment, (4) carrying out membrane biological reaction treatment on tertiary clear liquid after the secondary Fenton oxidation treatment, (5), adding quartic clear liquid after membrane biological reaction treatment into a biological active carbon device for treatment until the clear liquid after biological active carbon treatment reaches the standard. The method can safely and effectively remove hard-degradable organic matters and hardness in the secondary reduction membrane filtration concentrated solution, can reduce the influence on a biochemical system, and achieves safe and stable effluent.

Description

technical field [0001] The invention relates to a method for treating landfill leachate nanofiltration concentrated liquid with secondary reduction membrane filtration, and belongs to the technical field of landfill leachate treatment. Background technique [0002] For the treatment of landfill leachate, the combined process of "pretreatment + biological treatment + advanced treatment" is now widely used. The advanced treatment is generally a nanofiltration treatment process. Although it can ensure that the effluent is discharged up to the standard, since the nanofiltration only plays the role of physical filtration, when the clear liquid reaches the standard, 20-25% membrane filtration concentrate will be produced. However, most of the divalent salts in the leachate and organic substances that are difficult to biodegrade or cannot be biodegraded are enriched in the concentrated nanofiltration solution. [0003] The treatment methods of nanofiltration concentrate mainly inc...

AI Technical Summary

Problems solved by technology

Based on the pretreatment of hard and scale removal, most of the salt forms crystals, but this process has the problem of corrosion and scaling, and the investment and operation costs are high

Using a combination process including flocculation precipitation-advanced oxidation to treat the concentrated liquid with secondary reduction membrane filtration has a good effect on the removal of macromolecular humic acids, but the residual small molecule soluble organic matter in the concentrated liquid cannot be removed, and the reflux in the system is used The effective biodegradability is reduced, which has a greater impact on the biochemical system

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