Method for modifying natural zeolite powder

Abstract

The invention discloses a method for modifying natural zeolite powder, which uses an inorganic alkali and sodium chloride as modification medicaments to modify the natural zeolite powder by a solution soaking method. The method comprises the following steps: firstly, mixing the natural zeolite powder and the sodium chloride, soaking the mixture in sodium hydroxide solution for an adsorption reaction, washing the product of the absorption reaction with water till the pH value of the product is neutral after the reaction is finished; and secondly, drying the product of the absorption reaction to obtain modified zeolite powder. The modification method of the invention avoids the use of organic acids and the production of toxic and harmful substances, effectively prevents low-concentration ammonian pollution of the raw water of drinking water without changing the prior drinking water treatment process, does not change the pH value of the raw water after being used, does not exert influence on the subsequent processes, and improves the ammonian adsorption performance of the modified zeolite powder by 30 to 80 percent.

Description

technical field [0001] The invention belongs to the field of environmental chemical industry, and in particular relates to a modification method of natural zeolite powder. Background technique [0002] At present, the pollution of surface water in our country is serious, and most drinking water sources are polluted by ammonia nitrogen. Many countries in the world have strictly limited the content of ammonia in drinking water standards, and the treatment technology of ammonia in water has also attracted people's attention. [0003] At present, the methods for treating ammonia in water mainly include air stripping, nitrification and denitrification, breakpoint chlorination, and ion exchange, etc., each of which has its own advantages and disadvantages: although air stripping treatment is an effective method for removing ammonia, but the method For low-temperature water, the efficiency of ammonia removal is significantly reduced, and this method is only suitable for treating se...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for treating ammonia in water mainly include air stripping, nitrification and denitrification, breakpoint chlorination, and ion exchange, etc., each of which has its own advantages and disadvantages: although air stripping treatment is an effective method for removing ammonia, but the method For low-temperature water, the efficiency of ammonia removal is significantly reduced, and this method is only suitable for treating sewage with high concentration of ammonia nitrogen under strong alkalinity and high-temperature heating, and is not suitable for drinking water treatment; nitrification and denitrification ammonia removal technology is only suitable It is used to treat medium and high concentrations of ammonia nitrogen in wastewater by biochemical methods, but the effect of treating low concentrations of ammonia in slightly polluted water is not obvious, and the traditional drinking water treatment process needs to be changed, and the cost is high; the method of adding chlorine at breakpoints Excessive chlorine needs to be added during the treatment process, which often produces chlorine-containing by-products and is toxic, so it is not suitable for treating ammonia nitrogen in drinking water; ion exchange is an effective method for treating trace amounts of ammonia nitrogen in water, but traditionally used Ion exchangers are not conducive to the removal of ammonia due to their preferential exchange with other ions in water, and it is obviously not feasible to use ion exchange resins to treat raw water in large industrialized water plants

This method can remove organic or inorganic impurities on the surface of zeolite and in micropores, improve the exchange capacity of zeolite per unit weight, and accelerate the exchange rate; at the same time, reform the cations inside the zeolite to improve ion exchange performance, but the existing solution soaking The modification method has problems such as long modification time and unsatisfactory removal effect on ammonia nitrogen.