Landfill leachate treatment combination technology

Abstract

A combination process for landfill leachate treatment, comprising a facultative + aerobic biochemical treatment step and a reverse osmosis treatment step, characterized in that the reverse osmosis treatment step is performed before the facultative oxygen + aerobic biochemical treatment step. A deammonization treatment step may also be included, and the deammoniation treatment step is performed after the reverse osmosis treatment step. Compared with the prior art, the landfill leachate treatment combination process of the present invention puts the reverse osmosis treatment process before the biochemical treatment, and can directly intercept most of the pollutants in the leachate through the reverse osmosis system in advance, so that it can be well It solves the problem that the biochemical properties of landfill leachate change with "age", while occupying a small area. After the deamination treatment is placed in the reverse osmosis treatment step, the removal rate of ammonia nitrogen reaches 90-95%. Post-locating the facultative + aerobic (A/O) biochemical treatment process can greatly reduce the occupied area. The invention is a method for treating landfill leachate with reliable technology, economical feasibility and strong applicability.

Description

technical field [0001] The invention relates to a process for treating waste liquid, in particular to a combined process for treating landfill leachate. Background technique [0002] Leachate is the product of gravity flow of liquids in a landfill, mainly from precipitation and the embedded water of the waste itself. Because many factors may affect the properties of leachate during the flow of liquid, including physical factors, chemical factors and biological factors, the properties of leachate vary in a considerable range. Generally speaking, its PH value is between 4-9, COD is in the range of 2000-62000mg / L, BOD is from 60-45000mg / L, and it also contains a variety of high concentrations of heavy metals, salts and polysaccharides. pathogenic microorganisms. [0003] Municipal landfill leachate is a high-concentration organic wastewater with complex components, and its composition and properties change with the "age" of landfill, mainly in: (1) The composition of landfill...

AI Technical Summary

Problems solved by technology

In the aspect of ammonia removal, ammonia blowing tower or electrolysis method is mostly used. The use of ammonia blowing requires secondary adjustment of pH value, and it will cause secondary pollution to the air, resulting in high operating costs. The same electrolysis method also has the problem of high cost. In addition, due to the high concentration of organic pollution, the follow-up biochemical treatment occupies a large area; the third stage is after 2000. As the discharge standards become more and more stringent, landfill leachate cannot meet the treatment requirements only by biological treatment, and biological treatment + deep processing method