A method for treating landfill leachate concentrate by membrane method

A landfill leachate and treatment method technology, which is applied in the field of landfill leachate treatment, can solve problems such as high energy consumption, pollution transfer, and high operating costs, and achieve the effects of low energy consumption, reduced treatment costs, and low operating costs

Active Publication Date: 2016-07-06
TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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Problems solved by technology

[0008] It is the simplest, most economical and reliable method to directly spray back the membrane concentrated liquid or mix it with oil to the incinerator for incineration, and there is no land occupation and possible secondary pollution problems involved in other methods; but this method can The consumption is high and it is only suitable for waste treatment plants with a small amount of concentrate
[0009] Therefore, the current treatment method of landfill leachate membrane concentrate has problems such as pollution transfer, high operating cost, and high energy consumption.

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  • A method for treating landfill leachate concentrate by membrane method

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Effect test

Embodiment 1

[0067] After the biochemical + reverse osmosis membrane treatment of leachate from a landfill site, a membrane-based concentrated solution of about 30% of the total volume of the original landfill leachate was produced, which contained a large amount of refractory organic matter and salt. Adjust the pH value of the membrane method concentrated solution (feed solution) to 8.2, add sodium carbonate decalcification reagent to remove the calcium ions in the membrane method concentrated solution in the form of precipitates, and the removal rate of calcium ions is 92.5%; then through multi-stage Foam separation, microfiltration (average pore size is 0.1μm), ultrafiltration (cutoff molecular weight 6000MWCO) devices remove suspended matter and some refractory organic matter in the feed liquid after decalcification; then adjust the pH value of the filtrate to about 5.2 to make the solution Moderately saturated calcium salts are transformed into highly soluble calcium salts.

[0068] M...

Embodiment 2

[0073] After the biochemical + reverse osmosis membrane treatment of leachate from a landfill site, a membrane-based concentrated solution of about 30% of the total volume of the original landfill leachate was produced, which contained a large amount of refractory organic matter and salt. Adjust the pH value of the membrane concentrated solution (feed liquid) to 7.8, add sodium sulfite decalcification reagent to remove calcium ions in the membrane concentrated solution in the form of precipitates, the removal rate of calcium ions is 95%, and the feed liquid after decalcification After air bubbling oxidation, activated coke adsorption, microfiltration (average pore size: 0.1μm), ultrafiltration (cutoff molecular weight: 6000MWCO) devices, the suspended solids and some refractory organic substances in the feed liquid after decalcification are removed.

[0074] Membrane concentrated solution after pretreatment, conductivity is 63ms / cm, almost colorless, surface tension is 59mN / m, ...

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Abstract

The invention provides a method for treating the concentrated liquid of landfill leachate by membrane method, which comprises the following steps: pretreating the concentrated liquid by membrane method of landfill leachate to remove calcium ions and suspended matter that are easy to precipitate and scale, and increase the surface tension to more than 40mN / m, preferably to more than 65mN / m; then concentrated through a multi-effect membrane distillation system to obtain concentrated liquid and fresh water respectively; the concentrated liquid is evaporated, concentrated and crystallized, and the obtained solid salt is used as a harmless chemical filling Buried treatment, fresh water can be reused to the whole treatment process of landfill leachate. The method can treat the membrane concentrated solution of landfill leachate in a long-term, stable and effective manner, without changing the original process of the existing membrane concentration, without causing secondary pollution, and the process is simple, with low energy consumption and low operating costs. ; It can be applied to the membrane concentrated liquid treatment of various scales of landfill leachate.

Description

technical field [0001] The invention relates to a treatment method for landfill leachate, in particular to a method for treating the concentrated liquid produced by treating landfill leachate through reverse osmosis membrane, nanofiltration membrane or other filtration membrane methods. Background technique [0002] Landfill leachate is a complex, high-concentration, and difficult-to-treat wastewater. At present, the main treatment technology adopts the combination of biochemical and membrane methods. The biochemical method can remove most of the organic matter in the landfill leachate, effectively reduce the COD, ammonia nitrogen content, etc.; Membrane separation such as osmosis, further filtering the remaining organic matter, salt and other substances, so that the treated wastewater can meet the discharge standard. [0003] The process of membrane separation will produce concentrated water (membrane concentrate) with a total volume of 20-30%. The concentrated water is en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCY02W10/37
Inventor 秦英杰张艳萍刘立强崔东胜郝兴阁李海庆
Owner TIANJIN PURESEA SPRING MEMBRANE TECH CO LTD
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