Method for treating landfill leachate and concentrated solution

Abstract

The invention provides a method for realizing advanced treatment and recycling of landfill leachate by a combined process of a membrane distillation technology, an advanced oxidation technology and a short-cut nitrification-anaerobic ammonia oxidation technology. The method comprises a membrane distillation system, an anaerobic fermentation system, a micro-nano ozone bubble advanced oxidation system, a short-cut nitrification-anaerobic ammonia oxidation system and an A / O nitrogen and phosphorus removal system. According to the invention, the landfill leachate is separated and concentrated by using a membrane technology; the concentrated landfill leachate is pretreated through a micro-nano bubble ozone advanced oxidation technology, refractory persistent organic matters are removed, and the biodegradability of sewage is improved; and nitrogen in the sewage is removed through a short-cut nitrification-anaerobic ammonia oxidation reaction, and deep nitrogen and phosphorus removal of the landfill leachate and a concentrated solution is realized through an A / O process. The method has the advantages of high efficiency, low energy consumption and easiness in operation and management.

Description

technical field [0001] The invention relates to a method for treating landfill leachate and concentrated liquid by short-range nitrification-anammox combined membrane distillation and advanced oxidation. The purpose is to realize the standard discharge and comprehensive utilization of landfill leachate, which belongs to the field of sewage treatment. Background technique [0002] In recent years, with the increasing output of municipal solid waste, landfilling has gradually become the most widely used treatment and disposal method in the world. The landfill leachate has the characteristics of complex composition, large changes in water quality and quantity, high concentration of organic matter and ammonia nitrogen, and unbalanced ratio of microbial nutrient elements. If it is directly discharged into the environment without proper treatment, it will seriously damage the soil and surface of the surrounding area. water and groundwater environments. The mainstream process of "...

AI Technical Summary

Problems solved by technology

However, the membrane treatment method cannot completely degrade the leachate, and the refractory organic pollutants in the leachate are trapped in the concentrate through the process of membrane separation and membrane washing.

At present, there is no effective solution for the treatment of concentrate except for recharging to landfill

And in the process of landfill leachate and concentrate treatment, a single physicochemical or biological treatment technology can no longer meet the purpose of deep nitrogen and phosphorus removal

Images