Landfill leachate treatment system and method

Abstract

The invention relates to a landfill leachate treatment system and method. The system comprises a leachate adjusting pool, an anoxic pool, aerobic pool, a flocculent settling pool, a first middle watertank, a sand filter, a second middle water tank, a core filter, a first-stage DTRO film system, a second-stage DTRO film system, a concentrated liquid pool, a PAM agent dissolving and adding device and a PAC agent dissolving and adding device. The method includes the steps of adjusting the water quality and water volume of landfill leachate, conducting anaerobic biological treatment on the adjusted leachate, conducting aerobic biological treatment on the leachate obtained after anaerobic treatment, conducting flocculent settling on the leachate obtained after aerobic treatment, conducting quartz sand filtering treatment on leachate supernate obtained after flocculent settling treatment, conducting two-stage DTRO treatment on the leachate obtained after filtering treatment, discharging theup-to-standard water obtained after two-stage DTRO treatment, and backfilling a landfill with concentrated liquid obtained after multiple times of DTRO treatment. The system and method are low in operation cost, good in treatment effect and easy to operate and control.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a landfill leachate treatment system and method. 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. As of 2017, the annual output of municipal solid waste in my country has reached 400 million tons, and it is increasing at an annual rate of 8% to 10%, which is close to the level of industrially developed countries. Landfill is the main way of waste disposal in my country. Whether the landfill leachate is treated up to the standard discharge is one of the important indicators to measure whether a landfill is a regulated landfill. [0003] In the initial stage of landfilling, the leachate has low concentrations of organic matter and ammonia nitrogen and good biodegradability. However, with the extensi...

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Problems solved by technology

[0003] In the initial stage of landfilling, the leachate has low concentrations of organic matter and ammonia nitrogen and good biodegradability. However, with the extension of landfill time, the concentration of landfill leachate is getting higher and higher, the composition is more and more complex, and the biodegradability is better. The nature of the problem is reduced, and the change range is large and the change rule is complicated, which makes the processing more and more difficult

In the treatment of landfill leachate in my country, a combination of two-stage biochemical, ammonia stripping-biochemical method, and split MBR membrane treatment is usually used, which not only has high investment and operating costs, but also cannot guarantee stable operation, especially for landfill time. Longer "aged" fluids are very difficult to handle

At present, there is no practical technology that can economically and effectively solve the problem of landfill leachate treatment in the world

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