Two-stage treatment process for landfill leachate based on DTRO and MVR

Abstract

The invention discloses a two-stage treatment process for landfill leachate based on DTRO and MVR. The two-stage treatment process comprises the following steps: acid regulation treatment of raw water: collecting raw percolate A generated by a refuse landfill by using a pipe network, adjusting water quality and quantity by using an adjusting tank, lifting the raw percolate A to a DT raw water tankby using a floating pump, adding acid into the DT raw water tank, and adjusting the pH value of the raw percolate A to obtain percolate B; sand filtration treatment: pressurizing the percolate B by using a raw water pump B, allowing the pressurized percolate B to enter a quartz sand filter, arranging pressure gauges at a water inlet end and a water outlet end of the quartz sand filter, and when apressure difference exceeds a set value, allowing the quartz sand filter to execute a backwashing procedure to obtain leachate C; and core filtration treatment: allowing the leachate C to enter a core type filter for treatment to obtain leachate D. A disc tube type reverse osmosis membrane column used in the invention is strong in pollution resistance and more durable to use; through usage of highly-integrated DTRO and MVR systems, the advantages of small size, compact layout and high efficiency are obtained; and due to the application of the MVR system, landfill leachate treatment is stableand up-to-standard in discharge, and no concentrated solution is recharged or transported outwards.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a two-stage treatment process for landfill leachate based on DTRO and MVR. Background technique [0002] During the process of landfilling and stacking of garbage, the water generated by the decomposition of organic matter in the garbage and the free water in the garbage, precipitation, and infiltrated groundwater are the sewage formed by leaching. When the humidity of the garbage dump exceeds its water holding capacity After the capacity, the suspended or dissolved organic pollutants and heavy metals and other inorganic pollutants in the garbage dump will be dissolved together, and leachate will be produced. At present, about 64,000 tons / day of leachate are produced in my country's municipal solid waste landfill treatment facilities, and it is predicted that the amount of leachate produced will reach 33.51 million tons / year by 2020. [0003] In the existing landfill l...

AI Technical Summary

Problems solved by technology

[0003] In the existing landfill leachate treatment system, the concentrated liquid produced by membrane treatment has not been effectively treated, and the MVR system is prone to fouling and clogging. The traditional MVR system has complex manufacturing structure, high construction cost, low evaporation treatment efficiency, and large footprint

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