Treatment process for leachate of municipal refuse landfill

Abstract

The invention discloses a treatment process for leachate of a municipal refuse landfill. The treatment process comprises the steps of collecting to centralize refuse leachate; firstly, carrying out primary anaerobic treatment by using UASB (upflow anaerobic sludge blanket); then, carrying out nitration reaction in an A-section anaerobic tank to remove a great number of suspended matters and ammonia nitrogen; then, carrying out aerobic biochemical treatment and denitrification reaction by using an MBR membrane biochemical reactor to remove most of organic pollutants and COD, and sufficiently removing water entering a SuperRO system in a regulating tank; and finally, carrying out advanced treatment by using the SuperRO system to ensure that effluent reaches the standard. The process is relatively simple, the cost is easily controlled, a membrane system is not easily blocked by pollutants, the stability of the system is better, and the treatment process is particularly suitable for treating the leachate of the refuse landfill; in addition, the treatment process is novel in concept, artful in design, simple, easy to use, wide in application prospect and suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a leachate treatment process for urban waste landfills. Background technique [0002] The typical characteristics of domestic domestic waste are high content of kitchen waste, high moisture content, high content of organic matter, mixed collection, and relatively low calorific value. Therefore, in the design of domestic waste landfills, the storage capacity of the garbage pit is 3-7 days of garbage processing; that is, the garbage is stored in the garbage pit and fermented and matured for 3-7 days to achieve the moisture content in the garbage. Leach out, thus producing landfill leachate. The water quality of this leachate is not up to standard, and it will pollute the environment if it is discharged directly to the environment, so it must be treated. The amount of landfill leachate is affected by many factors, not only the amount of water changes greatly, but also the ...

AI Technical Summary

Problems solved by technology

In general, the concentration range of chemical oxygen demand CODcr in urban landfill leachate is 5000-10000mg / L, and the concentration range of biological oxygen demand BOD5 is 1000-4000mg / L. It also contains a variety of organic and inorganic substances (including toxic and harmful components), so Its water quality is quite complex, with many types of pollutants, and the concentration has short-term fluctuations and long-term changes.

[0005] 2) Water quality changes greatly

As the storage time increases, the BOD5 / CODcr value tends to decrease. For landfills with a long operating time, the leachate water quality fluctuates greatly

[0007] 3) High concentration of ammonia nitrogen

[0011] 5) The proportion of nutrients is out of balance

[0014] Landfill leachate usually contains a large amount of salt, and the total salt content is usually as high as 10,000mg / L or more. Membrane treatment will cause low water production rate due to excessive osmotic pressure, and biochemical treatment will cause startup due to high salt content. Difficult, unstable, or even impossible to run

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