Treatment method for garbage leachate membrane concentrated solution

Abstract

The invention discloses a treatment method for a garbage leachate membrane concentrated solution. The treatment method comprises the following steps: feeding the garbage leachate membrane concentrated solution into a membrane separating device to remove degradation-resistant organic substances such as humic acid in the concentrated solution, mixing the outlet water of the concentrated solution with a reverse osmosis concentrated solution, then removing scaling ions such as Ca<2+> and Mg<2+> and other inorganic substances in the concentrated solution by softening, precipitating and filtering, introducing the outlet water into the reverse osmosis membrane to further concentrate, and realizing up-to-standard release of produced water; and finally, spraying back the concentrated water back to an incinerator for incineration, evaporative crystallization or outward processing. The treatment method can be used for realizing efficient treatment of the garbage leachate membrane concentrated solution, and has the advantages of being stable in operation, high in treatment efficiency, low in operation cost, convenient to maintain and manage, and the like in comparison with the existing treatment method for the garbage leachate membrane concentrated solution.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in the environmental protection industry, and in particular relates to a method for treating a membrane concentrate of landfill leachate. Background technique [0002] The leachate produced during the landfill and incineration of garbage is a kind of high-concentration and difficult-to-treat organic wastewater with large changes in water quality and quantity, high ammonia nitrogen content, and complex components. With the improvement of national environmental protection requirements, leachate treatment effluent requirements meet the requirements of the "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB16889-2008). Traditional biochemical treatment and coagulation sedimentation processes are difficult to meet the requirements. Therefore, in order to ensure that the chemical oxygen demand, ammonia nitrogen and total nitrogen are fully up to the standard, the process of ...

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Problems solved by technology

Back-spraying or back-injection is a common treatment method for concentrated liquid. This method can degrade some organic matter through re-injection, but the re-injection of membrane concentrated liquid will make the dissolved salts and humic acid in the leachate very difficult in this cycle. Accumulate rapidly, resulting in unstable biochemical system, increased membrane osmotic pressure, gradually reducing the purification efficiency and effluent recovery rate of the membrane treatment system; the evaporation process solves the disadvantages caused by the continuous reflux of the membrane concentrate, but the main problem of the evaporation process The problem is high cost and serious corrosion and fouling of the evaporator; although the advanced oxidation method can effectively reduce the COD content in the membrane concentrate, and the decolorization effect is also very significant, but the corresponding energy consumption is high, and the operating cost is too high. Suitable for popularization and application; incineration method is the most thorough treatment method, but the energy consumption is very high, and because the total amount of membrane concentrate is relatively large (accounting for about 15% to 30% of the total leachate treated), therefore, the membrane Concentrate incineration treatment, the total operating cost will be very high

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