Processing method of landfill leachate

Abstract

The invention discloses a processing method of landfill leachate. The processing method comprises following steps: the landfill leachate is mixed with lime for sedimentation processing so as to obtain a sedimentation liquid containing solid slag; the sedimentation liquid containing solid slag is subjected to first filtration processing so as to obtain the solid slag and a first filtrate; the first filtrate is subjected to first absorption processing using anion exchange resin so as to obtain a first after absorption liquid and adsorption saturated anion exchange resin; the first after absorption liquid is subjected to air stripping so as to obtain an after air stripping liquid; the after air stripping liquid is subjected to second absorption processing using active carbon so as to obtain a second after absorption liquid; and the second after absorption liquid is subjected to second filtration processing so as to obtain an after purified liquid and active carbon slag. According to the processing method, the landfill leachate is processed via combination of chemical treatment methods and physical treatment methods, cost is low, effect is obvious, decoloration and deodorization can be realized effectively, heavy metal ions and ammonia nitrogen are removed effectively, and COD index is reduced greatly.

Description

technical field [0001] The invention belongs to the field of waste water and sewage treatment, in particular, the invention relates to a treatment method for landfill leachate. Background technique [0002] In recent years, my country's economy has developed rapidly, the scale of industrial and agricultural production has continued to expand, and people's living standards have continued to improve. However, behind the development, environmental problems are becoming more and more prominent. With the economic growth and the rapid expansion of the population, more and more garbage is produced, and the municipal solid waste is increasing at an annual growth rate of about 8%, causing serious pollution to the environment. At present, domestic and foreign municipal solid wastes are mainly treated by landfill, incineration, composting and comprehensive utilization. Among them, the sanitary landfill method has the advantages of lower processing costs, relatively mature technology,...

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Problems solved by technology

[0004] At present, the treatment technology of waste liquid is mainly based on biological treatment methods, but due to the high COD, high ammonia nitrogen, multiple metals, high toxicity and other factors of waste liquid, the components are quite complicated, and it is difficult to achieve the ideal effect only by ordinary biological methods

Harmful components such as ammonia nitrogen and COD in landfill leachate are much higher than ordinary wastewater, and the treatment cost is also higher than ordinary wastewater

Moreover, its sources are very extensive, and the leachate in different fields, environments, and regions is different, and there are many factors affected, so the water quality and quantity of the leachate are complex and changeable. At present, there is no perfect treatment process.

In the mid-to-late 1990s, the treatment process adopted at home and abroad was generally ammonia stripping + anaerobic treatment + aerobic treatment, but due to the high investment cost of this process in the process of ammonia nitrogen removal, the operating cost was relatively high

The method of biological treatment + advanced treatment is also applied to the treatment of landfill leachate, but it also has the problem of high treatment cost

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