Modified zeolite as well as preparation method and application thereof

Abstract

The invention discloses a modified zeolite as well as a preparation method and application thereof. The modified zeolite is prepared by mixing, roasting and cooling natural zeolite and magnesium oxide. Particularly, the preparation method comprises the steps of: taking natural zeolite and magnesium oxide as raw materials; mixing the natural zeolite and the magnesium oxide in mass ratio of (3-6): 1; roasting at a constant temperature of 100-600 DEG C for 2-6h; and naturally cooling to obtain the modified zeolite. The modified zeolite can be applied to the pre-treatment process of removing ammonia nitrogen in biological treatment aquaculture wastewater and used as an adsorbent for adsorbing the high-strength ammonia nitrogen in the aquaculture wastewater. The modified zeolite is strong in ability of adsorbing ammonia nitrogen, good in ammonia nitrogen adsorption effect, low in preparation cost, environmental-friendly and regenerative.

Description

technical field [0001] The invention relates to a zeolite and its preparation and application, in particular to a modified zeolite and its preparation method and application. Background technique [0002] The core treatment technology of aquaculture wastewater is microbial treatment technology, that is, through the nitrification and denitrification of microorganisms, ammonia nitrogen is converted into nitrite and nitrate, and then further converted into nitrogen to achieve the purpose of ammonia nitrogen removal. Due to the high concentration of ammonia nitrogen in the aquaculture wastewater, it usually leads to a decrease in the activity of activated sludge, which increases the treatment load and impact load of microorganisms, inhibits the normal progress of the biological treatment process, and also limits the recycling of the treated effluent. In addition, the organic matter content of aquaculture wastewater is low, and an external carbon source is usually required in the...

AI Technical Summary

Problems solved by technology

Solution immersion modification is to use inorganic acid solution, inorganic alkali solution or inorganic salt solution to soak natural zeolite. This method can remove some water-soluble residues and inorganic impurities on the surface and inner pores of natural zeolite, and improve the quality of the natural zeolite to a certain extent. The ion adsorption and exchange capacity of zeolite, but there are shortcomings such as long modification soaking time, small increase in ammonia nitrogen adsorption capacity, and it is difficult to remove mineral impurities that are firmly combined with zeolite

High-temperature calcination can remove such impurities to the greatest extent, increase porosity, and enhance the surface activity and adsorption capacity of zeolite. However, a single modification of natural zeolite through high-temperature calcination usually requires a high temperature of 600 ° C to 800 ° C, and the energy consumption is relatively high. High, and easily lead to the destruction of the zeolite structure, making it lose the adsorption and ion exchange

Images