A material for deep removal of ammonia nitrogen in water and its preparation and application method

Abstract

The invention discloses a material for deep removal of ammonia nitrogen from water, and a preparation method and an application method of the material. The preparation method comprises the following steps: adopting natural zeolite powder as a main raw material, adding a binder and a foaming agent, proportioning above materials, mixing all the materials, molding the obtained mixture, cutting the molded mixture, and carrying out autoclaved curing to obtain the zeolite aerated concrete particle material with the particle size of 10-30mm, small apparent density and high open porosity. The material can selectively adsorb ammonia nitrogen in water, and is a high-efficiency microbial carrier material; and a nitrogen removal treatment tank is filled with the material, and then adsorption, water emptying, blasting oxygen introduction and water leaching are sequentially carried out to make the concentration of ammonia nitrogen in water be smaller than 1.5 mg / L.

Description

1. Technical field [0001] The invention relates to the deep denitrification of the secondary effluent of domestic sewage, eutrophic river water and slightly polluted landscape water. 2. Background technology [0002] With the aggravation of water pollution, eutrophication has generally occurred in surface water bodies in my country. This requires more stringent denitrification and phosphorus removal of sewage. The nitrogen in the secondary effluent of domestic sewage and the surface landscape water mainly exists in the form of ammonia, nitrate, nitrite, and organic nitrogen, and the phosphorus in it mainly exists in the form of orthophosphate and organic phosphorus. [0003] At present, ammonia nitrogen in advanced treatment water is mainly converted into nitrate and nitrite nitrogen through microbial nitrification in the biological aerated filter. There are several defects in the advanced treatment of water by biological aerated filter technology: (1) Most of the organic ...

AI Technical Summary

Problems solved by technology

There are several defects in the advanced treatment of water by biological aerated filter technology: (1) Most of the organic nitrogen and ammonia nitrogen in domestic sewage are converted into nitrate nitrogen in the aerobic biochemical water treatment, and some of them are converted into nitrate nitrogen in the system due to denitrification It is nitrogen, and nitrate nitrogen with high price still remains in the water. Although the removal rate of ammonia nitrogen can reach more than 90%, the removal rate of total nitrogen is not high, generally 20-40%. At present, there is still a lack of cheap and efficient denitrification for domestic sewage (2) Aeration is required. Due to the hydrostatic pressure, the air pressure of the aeration fan is high, the utilization efficiency of oxygenation is low, and the energy consumption is high; (3) Backwashing is also required to eliminate the filtration The aging biofilm layer on the surface of the material particles eliminates the clogging of voids

The disadvantages of this filler are: the strength of the foamed plastic particles as the core is low, and the shell layer composed of natural zeolite is easily broken under pressure and the gravity of the particles; the foamed plastic particles lack open spaces, and microorganisms cannot enter the core of the foamed plastic particles Medium attachment growth; natural zeolite particles as the outer shell also lack macroporous voids

All of these lead to insufficient loading of microorganisms in the filter particles, which affects the efficiency of microbial nitrification, denitrification and denitrification.