Preparation method of sodium ferrocyanide zinc deammonization material and its application in deammonization of sewage

Abstract

The invention provides a preparation method of an ammonium removing material of ferrous zinc sodium cyanide deammonium material and application of the deammonium material to sewage ammonium removal and belongs to the technical field of the sewage ammonium removal. A chemical formula of the ferrous zinc sodium cyanide is Na2ZnFe(CN)6; the preparation method of the material comprises the following steps: preparing a zinc salt solution and a ferrous sodium cyanide solution respectively; adding a certain mass of sodium chloride into the ferrous sodium cyanide solution to completely dissolve the sodium chloride into the ferrous sodium cyanide solution, so as to obtain a ferrous sodium cyanide and sodium chloride mixed solution; gradually dropwise adding the zinc salt solution into the mixed solution; carrying out magnetic stirring while dropwise adding the zinc salt solution; after dropwise adding the zinc salt solution, continually stirring to obtain white suspension liquid; standing and precipitating; centrifuging and separating to obtain white solids; repeatedly washing the white solids with de-ionized water to remove impurities; drying to obtain the ammonium removing material Na2ZnFe(CN). The ammonium removing material provided by the invention has the advantages of large ammonium ion adsorption capability, high adsorption selectivity, low production cost and stable performance.

Description

technical field [0001] The invention relates to the technical field of deammonization of sewage, in particular to a preparation method of a material for deammonization of sodium zinc ferrocyanide and its application in deammonization of sewage, which is suitable for large-scale popularization and application. Background technique [0002] In my country, with the acceleration of urbanization, people's living standards are improving, environmental pollution and people's attention to the environment are getting stronger and stronger, while municipal sewage often contains a large amount of ammonium nitrogen, and excessive ammonia nitrogen will cause serious damage to the water body. Pollution. Studies have shown that when the concentration of ammonia nitrogen in surface water is about 5mg / L, it will have a toxic effect on fish. Therefore, wastewater containing higher concentrations of ammonia nitrogen must be treated before entering the water body. At present, the conventional tr...

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Problems solved by technology

Although the cation exchange resin has a relatively large exchange capacity, its selectivity to ammonium ions is very poor, and it can adsorb almost all cations in the water body, and the fatal shortcoming of the cation exchange resin is that it is easily polluted by charged organic substances in the water body and becomes invalid. normal operation of the project

Zeolite molecular sieves have certain selectivity to ammonium ions, but the biggest shortcoming of zeolite molecular sieves is that the adsorption capacity is too low, resulting in frequent regeneration or the amount of adsorbent required is too large (Wang Minghui et al., "13X Molecular Sieve for Ammonia Nitrogen Removal / Preparation and performance characterization of PES membrane adsorbent", Chinese Journal of Environmental Engineering, 2013, 1, 3749-3754.)

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