Filters Media Carrier

The core of the autotrophic denitrification technology is the Fe-S coupling biological carrier independently developed by Longantai. This biological carrier consists of Fe-S nanocores and alkalinity loading, offering a large specific surface area and high efficiency.

Operation principle: In anoxic environments, denitrifying bacteria use Fe-S nanocores as electron donors and nitrate (NO₃⁻), nitrite (NO₂⁻), and other nitro pollutants as electron acceptors. Inorganic carbon sources (CO₂, HCO₃⁻, CO₃²⁻) are utilized for metabolic carbon, converting pollutants such as NO₃⁻ and NO₂⁻ in the wastewater into N₂.

The alkalinity loading is evenly distributed within the pores of the coupling biological carrier, forming a synergistic mechanism with the Fe-S nanocores. This effectively balances the pH of the denitrification process, maintaining the alkalinity activity in the water environment.

The Fe-S nanocores also promote the metabolic coupling of microorganisms, leading to self-activation of the denitrification reaction process, achieving efficient, continuous, and stable denitrification.

The conventional fluoride removal using activated alumina takes advantage of its excellent adsorption properties, which are attributed to the unique structure of activated alumina. The number of oxygen ions in the second layer of activated alumina is double that of the first layer, and these oxygen ions are connected to aluminum ions. As a result, aluminum ions are exposed on the surface, enabling them to bond with fluoride ions (F—), thereby achieving fluoride removal.

The fluoride removal filler developed by your company for fluorine-containing wastewater is based on conventional activated alumina. It undergoes modification with a specific modifier and then a secondary calcination activation. During the modification process, the water molecules adsorbed by the alumina form hydroxyl groups with varying activity levels. The calcination activation step enhances the active sites between the hydroxyl groups and metal ions, thereby improving the fluoride removal capability of the adsorbent.

The presence of phosphorus is one of the main causes of water body eutrophication. Although the pollutant concentrations in urban non-point source wastewater and agricultural non-point source wastewater are relatively low, they still fall within the category of wastewater and have a significant impact on natural water bodies like rivers and lakes. For the advanced treatment of such wastewater, using simple, effective, and low-cost processes to further enhance phosphorus removal capacity is crucial. Improving the total phosphorus index in these low-pollution waters to surface water class III, or even class II, is of great importance for protecting the water quality of rivers and lakes.

The phosphorus removal filler independently developed by Longantai features a porous network structure. By incorporating specialized nano-active components, it increases the number of active adsorption sites for phosphorus and slowly releases functional ions. These ions react with phosphorus to form harmless phosphate precipitates, achieving efficient phosphorus removal. Additionally, the filler can also serve as a growth medium for microorganisms, enabling synergistic biological/chemical phosphorus removal.