Preparation method and application of modified zeolite balls

Abstract

The invention discloses a preparation method and the application of modified zeolite balls. The preparation method comprises the following steps: grinding natural zeolite into a powder, sieving the powder by using a 200-mesh sieve, uniformly mixing the powder with walnut shell granules (with the size of 0.2-3mm) and sodium silicate according to a ratio of (2-6): 1: 1, balling, drying for 2h at a temperature of 100 DEG C, sintering for 2-5h at high temperature by using a muffle furnace, and naturally cooling to obtain the modified zeolite balls which show macroscopic honeycomb porous morphologies on the surfaces and in the inner parts. Microorganisms can grow in multiple micropores in the surfaces and in the inner parts in an attaching manner, the zeolite itself has a relatively good ammonia nitrogen adsorbing effect, and in combination with microbial treatment, a better adsorbing effect can be achieved; moreover, the microorganisms growing on the surfaces in an attaching manner can also help desorption of the saturated zeolite absorbing ammonia nitrogen, so that the zeolite balls can regain the adsorbing capacity; the modified zeolite balls have a relatively good treatment effect on low-concentration ammonia nitrogen wastewater; the preparation method of the zeolite balls is low in cost, simple in process, environment-friendly and pollution-free.

Description

technical field [0001] The invention relates to a preparation method and application of modified zeolite balls, belonging to the technical field of sewage treatment. Background technique [0002] Nowadays, with the rapid increase of population, the continuous acceleration of urbanization process and the rapid development of industry and agriculture, a large amount of domestic sewage and industrial and agricultural wastewater containing ammonia nitrogen are discharged into rivers, lakes and seas. Ammonia nitrogen mainly exists in two forms: ① free ammonia (NH 3+ ), ② ammonia salt (NH 4+ ). Ammonia nitrogen is prone to nitrification and denitrification reactions in nature. Nitrification reactions occur through the action of nitrifying bacteria and nitrosifying bacteria. Ammonia nitrogen is oxidized to nitrate and nitrite, and nitrate and nitrite are denitrified under the action of denitrifying bacteria. The reaction reduces to gaseous nitrogen. The high concentration of am...

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Problems solved by technology

Ammonia nitrogen can also cause eutrophication of the water body, algae and other microorganisms multiply and grow, so that the dissolved oxygen (DO) in the water body is low, causing a large number of fish and aquatic organisms in the water body to die, the water body is black and smelly, corroded metal pipes, The blooming of algae will also affect the shipping and increase the cost of salvage, etc.

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