Inorganic ion modified zeolite composite material and application thereof

Abstract

The invention discloses an inorganic ion modified zeolite composite material and its application. A method for obtaining the composite material comprises the following steps: (a) preparing a solution A containing MgCl2, AlCl3 and FeCl3, a solution B containing NaOH and Na2CO3 and a zeolite suspension; (b) dripping the solution A and the solution B into the isometric zeolite suspension; (c) stirring the mixed solution for 1 h and filtering, and alternately washing and filtering a filtrate until the filtrate contains no Cl<->; and (d) taking a filter cake, drying the filter cake, moving the dried filter cake into a muffle furnace and firing so as to obtain the composite material. The inorganic ion modified zeolite composite material can be applied to sewage treatment so as to achieve the effect of simultaneous phosphorus and nitrogen removal. Thus, NH4<+>-N, NO3<->-N and TP in sewage is effectively removed.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical industry, in particular to the mixing of inorganic ion-modified zeolite composite materials and its application. Background technique [0002] Eutrophication refers to the fact that a large amount of nitrogen, phosphorus, potassium and other elements are discharged into the surface water body with slow flow rate and long renewal cycle, which makes algae and other aquatic organisms grow and reproduce in large numbers, and the rate of organic matter production is far faster than that of water. Consumption speed, accumulation of organic matter in the water body, and the process of destroying the aquatic ecological balance; eutrophication of the water body reduces the transparency, sunlight is difficult to penetrate the water layer, affects the photosynthesis of plants in the water, causes the supersaturation of dissolved oxygen, and causes a large number of fish to die. At the same ...

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Problems solved by technology

According to the article "Preparation of hydrotalcites and their removal of nitrate in water" (Xu Pan et al., South China University of Technology. 2013), it is reported that Mg / Fe hydrotalcites are in NO 3 -N (nitrate nitrogen) initial concentration of 100mg / l for NO 3 — -N removal efficiency can reach 96%, but for low concentration of NO 3 - -N article is not involved; there are related literatures that report that the removal efficiency of Mg / Al hydrotalcites to the initial phosphate ion concentration of 10mg / l can reach 90%, and there is no report on the experiment for lower concentration of phosphate ions [Akihiro Shimamura, Mark I. Jones, Anionic surfactant enhanced phosphate desorption from Mg / Al-layered double hydroxides by micelle formation. Journal of Colloid and Interface Science. 2013, 411:1-7]

It can be seen that hydrotalcite-like has a good removal effect on a certain concentration of nitrate nitrogen and phosphate ions. However, the aging time of hydrotalcite-like in the preparation process is long, and it is not suitable for separation in the washing process after aging, which restricts the removal of hydrotalcite-like The development of hydrotalcite

[0006] Zeolite is widely used in the removal of chroma, nitrogen, phosphorus, fluorine, arsenic and other heavy metal ions in water because of its great ion exchange performance and adsorption performance, among which the removal effect on ammonia nitrogen is the most obvious, ZHU Wen-Ling et al. People compared the adsorption effects of zeolite, ceramsite, vermiculite, paddy soil, laterite and peat on ammonia nitrogen, and the results showed that zeolite had the best adsorption effect on ammonia nitrogen, and when the initial concentration of ammonia nitrogen was 1500mg / l, the removal efficiency of ammonia nitrogen It can reach 97.1%; when the initial concentration of ammonia nitrogen is 100mg / l, the removal rate of ammonia nitrogen drops to 72.0%, but the literature does not study the removal rate of ammonia nitrogen at low concentrations[ZHU Wen-Ling, CUI Li-Hua, Kinetic Adsorption of Ammonium Nitrogen by Substrate Materials for Constructed Wetlands. Pedosphere 21(4): 454–463, 2011]; studies have shown that zeolites have no significant removal efficiency for anion nitrate nitrogen and phosphate ions, and some methods for zeolite modification have been reported, Yang Shujia et al. through NaOH solution and MgCl 2 Solution modified zeolite, for NH 4 + -N (ammonia nitrogen), PO 4 3- It has good removal efficiency, but the utilization rate of modified zeolite is low in this study, and the NO 3 - -N has no removal efficiency [Yang Shujia. Study on simultaneous removal of ammonia nitrogen and phosphorus in water by magnesium modified zeolite [D]. Shanxi University. 2013]

At present, loading inorganic ionic hydrotalcites on zeolite to achieve simultaneous nitrogen and phosphorus removal by combining the structural and functional advantages of zeolite and hydrotalcites has not been reported yet.

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