Landfill leachate treatment technology

Abstract

The invention relates to the field of wastewater treatment, in particular to a landfill leachate treatment technology. The technology includes: collecting wastewater by a collection pool, introducing the wastewater in the collection pool into an oil separation pool, bringing the wastewater subjected to oil removal by the oil separation pool into a comprehensive regulation pool, adding a small amount of air and conducting stirring to obtain uniform water quality, making the effluent water from the comprehensive regulation pool enter a PH regulation pool I and adding a liquid alkali to regulate the pH value to 8.0-10.0, letting the effluent water from the pH regulation pool I enter a tubular ultrafiltration membrane system through a concentration trough to undergo treatment, leading the effluent water from the tubular ultrafiltration membrane system into a pH regulation pool II, and adding an acid to conduct neutralization, making the neutralized water enter an RO membrane system, and finally carrying out filtration by the RO membrane so as to obtain reusable effluent water. By adopting the tubular ultrafiltration membrane (DF membrane) system and RO membrane equipment, the technology provided in the invention reduces the sedimentation, filtration, clarification and purification, hollow fiber ultrafiltration and other treating processes commonly used in domestic landfill leachate treatment, and has the advantages of stable operation, less investment, low operation cost, and simple treatment process, etc.

Description

Technical field: [0001] The invention relates to the field of waste water treatment, in particular to a landfill leachate treatment process. Background technique: [0002] It is understood that in 2009 China produced about 200 million tons of municipal solid waste annually, of which 70% were landfilled, 10% were incinerated and composted, and the remaining 20% ​​were difficult to recycle. By 2010, my country's municipal solid waste will reach 264 million tons, 409 million tons in 2030, and 528 million tons in 2050. The sanitary landfill method has been widely used in waste disposal due to its advantages of low cost, mature technology, and convenient management. According to the survey of 329 domestic municipal waste disposal plants by China Environmental Monitoring Center, sanitary landfills account for 87.5% of waste disposal facilities. [0003] Landfill leachate refers to the moisture contained in the garbage itself in the landfill, the rain and snow water and other moi...

AI Technical Summary

Problems solved by technology

[0005] (2) High NH3-N content, serious imbalance of nutrient element ratio

[0006] (3) Water quality and water quantity vary greatly

[0007] (4) High content of heavy metal ions

[0008] At present, domestic landfill leachate treatment methods are commonly used through multiple treatment processes such as sedimentation, filtration, clarification and purification, and hollow fiber ultrafiltration. Similar to the treatment method, the whole set of equipment occupies a large area, and PAM agents need to be added during the flocculation and settlement process. The system It is complex, and there are many factors affected at the same time. To achieve the coordinated operation of the entire system requires a high level of technology. Once one of the processing processes is "paralyzed", the entire process will be seriously affected or even shut down; secondly, the use of the above processes will also generate more than 30% concentrate, the concentration of pollutants is very high, and its treatment is still a problem

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