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Method for removing and recycling high-concentration Ca<2+> and Mg<2+> in leachate MBR and NF concentrate

A concentrated liquid and high-concentration technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of high energy consumption, difficulty in high-fold concentration, difficulty in stable operation of membrane system, etc. The effects of secondary pollution, simple process and equipment, and less land occupation

Active Publication Date: 2016-02-03
FUZHOU UNIV
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Problems solved by technology

[0004] The object of the present invention is to aim at containing high concentration Ca 2+ , Mg 2+ The leachate MBR+NF concentrate is difficult to concentrate at a high multiple during the process of extracting humic acid-containing water-soluble fertilizers by membrane technology, high energy consumption, or precipitation of calcium sulfate, which makes the membrane system difficult to operate stably. High concentration of Ca in leachate MBR+NF concentrate 2+ , Mg 2+ , and the method of reusing the precipitate after solid-liquid separation

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  • Method for removing and recycling high-concentration Ca&lt;2+&gt; and Mg&lt;2+&gt; in leachate MBR and NF concentrate

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Embodiment 1

[0018] In the following, Ca in the MBR+NF concentrate of the leachate mixture of a domestic waste landfill and waste incineration plant leachate 2+ , Mg 2+ The removal and reuse are taken as examples to further illustrate the present invention.

[0019] The leachate of the domestic waste leachate treatment plant is the mixed leachate of landfill and incineration plant, which produces 1,500 tons of leachate per day. It adopts water quality balance as the pretreatment process, MBR as the main biochemical treatment process, and NF as the advanced treatment process flow. The treatment plant produces about 300 tons of MBR+NF concentrate per day, and its water quality is as follows: Ca 2+ and Mg 2+ The concentrations were 2646mg / L and 1224mg / L, PO 4 3- =5mg / L. The MBR+NF concentrate is lifted from the raw material pump to the reaction system through the collection tank, according to the stoichiometric ratio n (Ca 2+ +Mg 2+ ) / n (PO 4 3- )=1.6 add Na 3 PO 4 12H 2 O, the r...

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Abstract

The invention discloses a method for removing and recycling high-concentration Ca<2+> and Mg<2+> in garbage leachate MBR and NF concentrate. According to the method, phosphate radicals are used to react with Ca<2+> and Mg<2+> in the MBR and NF concentrate to produce a precipitate mixture, and then solid-liquid separation is carried out to effectively remove Ca<2+> and Mg<2+>; moreover, the content of residual phosphate radicals in a supernatant obtained after precipitation is low; and sediment can be used as a raw material for water-soluble fertilizer containing humic acid after dissolving by nitric acid, so reclamation is realized. The method is advanced, practical and economic, has simple flow, uses simple equipment, occupies a small area of land and does not pose secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, in particular to a kind of high concentration Ca in the garbage leachate MBR+NF concentrate 2+ , Mg 2+ Methods of removal and reuse. Background technique [0002] Landfill leachate is a kind of high-concentration organic wastewater containing complex pollutants such as organic matter, ammonia nitrogen, heavy metals, and inorganic salts. It is one of the main secondary pollutions in the process of sanitary landfill, incineration, and composting. At present, the typical process of leachate treatment is MBR+NF. This combined process makes the treated effluent meet the discharge standard limit in the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008), and at the same time inevitably produces 1% of the original liquid volume. / 8-1 / 4 of the MBR+NF concentrate, the current methods to deal with this concentrate include backfilling landfill, advanced oxidation, back...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/28
Inventor 许玉东林燕评李晓东
Owner FUZHOU UNIV
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