Sulfur-based autotrophic microorganism denitrification material as well as preparation and application methods thereof

Abstract

The invention discloses a sulfur-based autotrophic microorganism nitrogen removal material as well as a preparation method and an application method thereof. The autotrophic nitrogen removal material is a particulate matter obtained by mixing a sulfur-containing raw material with lime powder and then carrying out melting, forming and surface carbonation. The autotrophic nitrogen removal material disclosed by the invention is used as a filler of an anaerobic biological filter to construct a deep anaerobic biological filter bed, the nitrogen content of 25mg/L nitrate and nitrite can be reduced to be less than 5mg/L under the conditions that the hydraulic retention time is 40-60min at a proper temperature, the material disclosed by the invention is used for replacing an organic matter carbon source such as sodium acetate for nitrogen removal by denitrification, and the nitrogen removal cost is saved by more than 50%.

Description

Technical field [0001] The present invention relates to the field of environmental functional materials and sewage treatment technology, more particularly, to a method of preparation and application of an autotrophic microbial denitrification material. Background [0002] Nitrogen is one of the most important elements that contribute to eutrophication of water bodies, but in the past the focus in water treatment and surface water environments was mainly on the control of ammonia nitrogen. In recent years, with the increasing eutrophication of water bodies, especially the widespread emergence of urban black and odorous rivers, nitrate nitrogen and total nitrogen have been included in the sewage and water control indicators, and more and more stringent nitrogen control standards have been formulated everywhere. [0003] Nitrification- heterotrophic denitrification has always been the mainstream process technology of wastewater denitrification, which converts organic nitrogen and am...

AI Technical Summary

Problems solved by technology

However, the backwashing process not only washes out the particles that cause the blockage, but also causes the biofilm to fall off. The recovery of the biofilm takes a certain period of time, which affects the quality of the effluent in the recovery stage of the biofilm.

In addition, the density and strength of sulfur particles are low, and the density and strength of carbonate minerals are different from those of carbonate minerals. Backwashing is likely to cause wear and loss of sulfur particles, and also cause separation of sulfur particles and carbonate particles.