A High Efficiency Landfill Leachate Treatment Technology for All Up to Standard Discharge

Applicating Company

Guangzhou Sunny Environmental Protection Technology Co., Ltd.

Technology Name

A High Efficiency Landfill Leachate Treatment Technology for All Up to Standard Discharge

Technical principle

Principle of efficient and fully quantified landfill leachate treatment technology (Principle of the high efficiency landfill leachate treatment technology for all up to standard discharge)：

Firstly, the landfill leachate was pretreated by advanced oxidation/reduction technology to degrade the toxic and refractory pollutants in the wastewater and improve the biodegradability. This project adopts the coupling technology of three-dimensional electrocatalytic oxidation and ozone catalytic oxidation to remove part of CODcr, ammonia nitrogen (total nitrogen) and most of total phosphorus in the wastewater, and improve the biodegradability of the wastewater. After pretreatment, the effluent is treated by the biochemical system to remove most CODcr, ammonia nitrogen (total nitrogen) and total phosphorus. The operation cost of the biochemical system is low, which is conducive to reducing the total operation cost of the system. After the biochemical effluent enters the advanced treatment system [ozone catalytic oxidation coupling technology + biological aerated filter(BAF)], so that the landfill leachate can be discharged up to the standard after treatment. Among them, two key technologies are: three-dimensional electrocatalytic oxidation technology (three-dimensional particle electrode material has been independently declared intellectual property rights) and ozone catalytic oxidation coupling technology (catalyst material has independent intellectual property rights).

Principle of three-dimensional electrocatalytic oxidation technology:

Three-dimensional particle electrode material is used in the surface of oxidation / reduction reaction to degrade the organic pollutants in the wastewater, and the heavy metal ions in the wastewater get electrons, reduced to metal particles precipitated and separated from the wastewater. Under the action of the electric field (current) provided by the special DC power supply, a large number of [OH·] hydroxyl radicals are produced on the surface of the three-dimensional particle electrode, so that the organic matter degradation reaction occurs. The result of the reaction is that the toxic, long chain and ring heteroatom organics get electrons and undergo ring opening, chain breaking and other degradation reactions, the functional groups of toxic organics are destroyed, the toxicity to microorganisms disappears, the long chain refractory organics break the chain and transform into small molecule biodegradable organics, the ring and heterocycle organics open, and some of them are finally degraded into CO2 and H2O, At the same time, the active iron in the material loses electrons and becomes divalent or trivalent iron ions into the solution. Because the iron ion flocculation under microalkaline conditions, it absorbs isoelectroically with the weakly negatively charged particles in the pollutant, forming a stable flocculation precipitate separation and removed.

Principle of ozone catalytic oxidation:

The coupling technology of ozone catalytic oxidation uses a variety of rare earth oxides as active catalytic materials. Through enrichment → catalytic activation → oxidative degradation, the reaction speed and efficiency of degradation of residual organics in wastewater are greatly improved. By combining the strong oxidizability of ozone with the characteristics of catalyst enrichment and catalytic activity, a series of problems such as low ozone treatment efficiency, low ozone utilization rate and high operating costs are more effectively solved. 

Scope of application

Landfill leachate; Wastewater from electroplating, electronic circuit board and metal smelting industries; Printing and dyeing wastewater; Leather production wastewater; Electrophoretic coating wastewater; High concentration wastewater from fine chemical industry; Toxic and high concentration organic wastewater in pharmaceutical industry; Oil, coking, coal chemical and other refractory wastewater; Papermaking wastewater that is difficult to be biodegraded; Soy sauce, vinegar, alcohol and other fermentation industrial wastewater; Sulfur containing and heterocyclic organic compound wastewater treatment, industrial park wastewater treatment, etc.

Process flow and description

Description: The combined technology of "three-dimensional electrocatalytic oxidation (pretreatment) +A/O biochemical system+ ozone catalytic oxidation coupling technology (advanced treatment)" was adopted to treat landfill leachate, realizing the landfill leachate treatment for all up to standard discharge without producing any concentrated solution, overcoming the disadvantages of traditional membrane filtration treatment technology, enriching the treatment technology of landfill leachate, and improving the traditional landfill leachate treatment technology.

Attachment: Process Flow

Promotion prospects

For complex wastewater such as landfill leachate, based on the idea of "pretreatment + biochemical + advanced treatment", the combined pretreatment process equipment of "three-dimensional electrocatalytic oxidation + ozone catalytic oxidation coupling technology" with a wide range of adaptation and high efficiency has been developed, which can efficiently degrade macromolecules (or aromatic) refractory organic compounds and greatly improve the biodegradability of wastewater. Combined with high efficiency biochemical treatment technology, the high efficiency purification of landfill leachate was realized. The combined pretreatment technology is of pioneering significance in the treatment of high-concentration and refractory wastewater, breaking through the problems of low treatment efficiency, high operation cost and small adaptation range of the existing technology.