Process for treating landfill leachate

Abstract

The invention provides a combined process for treating landfill leachate, which is an AFOS combined process. The process is detailed in specifications. The invention has the advantages that: by adopting a two-phase anaerobic treatment process, through utilizing combustion of landfill methane or methane of an anaerobic reactor producing methane to heat and raise the temperature, energy resources are recycled and the operation cost is effectively lowered. Hardly degradable organic matters and ammonia nitrogen in the landfill leachate are further treated by using an HABF aerobic treatment process, the concentration of effluent ammonianitrogen can reach below 10mg / L, the treatment effect of CODCr is improved, the operation cost of subsequent deep treatment is lowered, and the influences of landfill B / C value reduction and ammonia nitrogen increment in future on biological treatment are considered. The deep treatment process adopts an oxidization-flocculation-precipitation method and the HABF process, improves the removal effect of the hardly degradable organic matters through comprehensive actions of oxidization, flocculation, precipitation, biodegradation and the like, and ensures that the landfill leachate is discharged after reaching standards. The deep treatment process has investment saving, simple operation and reasonable operation cost.

Description

technical field [0001] The invention relates to the field of landfill leachate treatment, and specific industries include landfill leachate and similar high ammonia nitrogen, high COD Cr Wastewater treatment and engineering transformation upgrades that contain high concentrations of refractory organic matter. Background technique [0002] With the increase of my country's urban population, the expansion of city scale and the improvement of residents' living standards, the output of urban domestic waste in my country is increasing sharply. It is increasing at a rate of 8-10% every year, and the per capita daily garbage production has exceeded 1kg, which is close to the level of industrially developed countries. Adopting sanitary landfill method is one of the commonly used methods for harmless, reduction and resourceful treatment of urban waste, and compared with incineration and composting, because of its low investment and simplicity, the proportion of About 70% or more. ...

AI Technical Summary

Problems solved by technology

Although there are many applications of aerobic processes such as SBR, and the processes are relatively stable and mature, there are the following limitations in the treatment of landfill infiltration: ① Due to the large number and complexity of refractory substances in landfill leachate, it is difficult to use conventional activated sludge technology in large quantities. Therefore, it is difficult to meet the requirements of the treatment target; ②The operation management is complicated, and the sludge cultivation time is long, especially during the factory maintenance period, the sludge is easily inactivated, and the sludge must be re-cultivated when the sewage treatment is run again; ③The landfill leachate Although the removal efficiency of medium ammonia nitrogen is high, it cannot meet the corresponding emission standards.

[0016] In short, for the treatment of landfill leachate, the above methods or their combined processes have been mainly developed. However, due to insufficient consideration of the complexity and variability of landfill leachate during process design, the above methods or None of the combined processes can jump out of the idea of ​​traditional sewage treatment technology, so so far there is no economically feasible, continuous and stable treatment process

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