Sulfur autotrophic filler

The sulfur autotrophic filter uses elemental sulfur and iron composite minerals as the filter media. The composite filter material not only has the function of intercepting suspended pollutants, but also acts as a slow-release electron donor to drive the attached autotrophic denitrifying bacteria to achieve denitrification. The selected composite filter media includes two types that can produce acid and alkali in the denitrification process, and through the optimization design of the composite ratio, the pH value can be maintained within a certain range throughout the denitrification process, thereby achieving a higher denitrification rate and meeting the requirements of the effluent pH value index.