In the field of environmental protection, the problem of nitrogen pollution of water bodies has always been of great concern. Nitrogen exists in many forms in sewage, and if it is discharged directly without effective treatment, it will lead to eutrophication of the water body, triggering a series of environmental problems such as excessive algal bloom and deterioration of water quality. In recent years, researchers have been exploring more effective wastewater treatment technologies, in which sulfur autotrophic filler has emerged as a key player in improving nitrogen removal efficiency.

Sulfur autotrophic denitrification technology, as an emerging wastewater treatment method, is different from traditional nitrogen removal. Traditional denitrification processes often rely on organic carbon sources to promote the growth and metabolism of denitrifying bacteria, so that the nitrate nitrogen in the wastewater is converted to nitrogen gas discharge. However, adding organic carbon sources not only increases the treatment cost but also may bring the risk of secondary pollution. Sulfur autotrophic denitrification is another way to reduce nitrate nitrogen to nitrogen gas by using sulfur autotrophic bacteria with inorganic sulfur compounds as electron donors. In this process, sulfur autotrophic filler plays a vital role.

The research team conducted relevant experiments to investigate the effect of sulfur autotrophic packing on nitrogen removal efficiency. Different types of sulfur autotrophic packings, including sulfurous iron ore and sulfur particles, were selected and applied in simulated wastewater treatment devices. These devices simulated the water quality conditions of actual sewage, containing a certain concentration of nitrate nitrogen and other pollutants. During the experiment, the researchers closely monitored the nitrogen removal in the devices and observed the changes in nitrate-nitrogen concentration.

After a period of operation, the experimental results were promising. The device using sulfur autotrophic filler demonstrated a high efficiency of nitrogen removal. Among them, the device using sulfurous iron ore as filler was able to significantly reduce the nitrate nitrogen content in the wastewater under certain conditions. This is mainly due to the special physicochemical properties of the surface of sulfurous iron ore, which provides a good attachment growth environment for sulfur autotrophic bacteria. The bacteria multiply on the surface of sulfurous iron ore, make full use of the sulfur in sulfurous iron ore to carry out denitrification reactions, and more effectively convert nitrate nitrogen into nitrogen gas.

Sulfur particles as a filler also show unique advantages. Sulfur particles are more uniform in texture and can provide a stable source of electron donors for bacteria. In the experiment, its participation in the denitrification reaction process is relatively stable, so that the concentration of nitrate nitrogen in the wastewater is gradually reduced, and the denitrification efficiency is maintained at a high level.

This study on the effect of sulfur autotrophic packing on nitrogen removal efficiency is of great significance. It provides new technical ideas and options for sewage treatment plants. In practical application, sewage treatment plants can reasonably select suitable sulfur autotrophic fillers according to the characteristics of their own sewage water quality, treatment costs, and other factors to optimize the nitrogen removal process and improve the effect of sewage treatment. This not only helps to improve the quality of the water environment and reduce the occurrence of eutrophication and other problems in the water body, but also reduces the cost of sewage treatment to a certain extent, and achieves a win-win situation in terms of economic and environmental benefits. With the continuous deepening of research and further improvement of technology, sulfur autotrophic filler is expected to be more widely used in the field of wastewater treatment, contributing more power to guard the earth's water resources environment.