Sulfur autotrophic denitrification nitrogen and phosphorus removal filler prepared at normal temperature

The invention relates to the technical field of water treatment, in particular to a sulfur autotrophic denitrification nitrogen and phosphorus removal filler prepared at normal temperature. According to the filler, sulfur powder and iron-rich sludge serve as main raw materials, nitrogen and phosphorus removal particles of an S-Fe-Ca cross-linked three-dimensional net structure are prepared at the normal temperature through a hydrogel embedding method, and the sulfur powder is prevented from being heated. The iron-rich sludge contains a large amount of Fe, Ca, Si, Al and microelements required by growth of microorganisms. The sulfur powder and the iron-rich sludge are cross-linked and coupled, so that phosphorus can be synchronously adsorbed, the sulfur powder and the iron-rich sludge can also be used as a basic framework of the filler, the stability of the filler is improved, the growth of microorganisms is promoted, and the problems of poor long-acting stability, low reaction rate and asynchronous phosphorus