Landfill leachate membrane concentrated solution treatment method

Abstract

The invention discloses a landfill leachate membrane concentrated solution treatment method. The method comprises the following steps that a landfill leachate membrane concentrated solution is sequentially subjected to electrocatalytic oxidation, coagulating sedimentation, ultrafiltration and evaporation treatment, and purification treatment of the landfill leachate membrane concentrated solutionis achieved. In order to solve the problems of unstable evaporation operation and easy scaling, electrocatalytic oxidation, coagulating sedimentation and ultrafiltration technologies are integrated toserve as an integral pretreatment means of an evaporation system, and all process sections are different in division of work. The content of organic matters in the wastewater is reduced through electrocatalytic oxidation, the hardness in the wastewater is reduced through coagulating sedimentation, and macromolecular substances such as suspended solids, colloids and particles generated at the front end are filtered through ultrafiltration. Due to the fact that the organic matter and hardness of evaporation inlet water are greatly reduced, the salt mud generation amount of an evaporation systemand scaling substances on the surface of an evaporator are reduced, the evaporation treatment effect is guaranteed, the evaporation cleaning frequency is reduced, the water quality of outlet water isimproved, and the stable treatment capacity of landfill leachate membrane concentrated solution is effectively improved.

Description

technical field [0001] The invention relates to a method for treating landfill leachate membrane concentrate, belonging to the field of leachate treatment. Background technique [0002] Landfill leachate concentrate is a kind of waste water after the landfill leachate is concentrated by membrane during the treatment process. It has the characteristics of high salinity, high organic matter and high hardness. It is one of the difficulties and hotspots in domestic and foreign research. It is currently the most widely used Treatment technologies include recharge landfill, Sinotrans sewage treatment plant co-treatment and evaporation. [0003] Recharge is the most commonly used treatment method for the treatment of concentrates in landfills. This treatment method is simple and low in cost, but recharge will cause the salt of the concentrate to return to the leachate, resulting in an increase in the accumulation of salt in the leachate, which seriously affects The normal operatio...

AI Technical Summary

Problems solved by technology

Generally, due to the high organic matter and hardness of the incoming water, the evaporation device cannot operate continuously, and frequent cleaning is required.

The high content of organic matter increases the difficulty of cleaning, the evaporation water production rate is low, and the water quality is often difficult to meet the standard

Since the macromolecular organic matter in the concentrated liquid will form an organic fouling layer during the evaporation process, it cannot be eliminated by conventional cleaning, the cleaning difficulty increases, the cleaning cost increases, and the cleaning time increases, which directly leads to the reduction of the effective working time of evaporation and the reduction of evaporation efficiency. Therefore, in order to reduce the frequency of cleaning, the general conventional evaporation process will add a coagulation and sedimentation device at the front end of the evaporation to remove the organic matter in the wastewater as much as possible before evaporation, but the effect is poor

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