A foamed porous core-shell type anammox-sulfur autotrophic composite filter material, a preparation method and application thereof

Abstract

This invention belongs to the field of wastewater treatment technology, specifically relating to a foamed porous core-shell type anaerobic ammonia oxidation-sulfur autotrophic composite filter media, its preparation method, and its application. This invention uses waste crocidolite and Bayer red mud as the main raw materials, a mixture of sodium tetraborate and cryolite as a flux, and fermented waste biomass as a foaming agent. After compaction, granulation, and sintering, spherical filter media A1 is obtained. Then, an electrostatic spray adhesion technology is used to coat the surface of A1 with an adhering liquid containing dolomite, siderite, and lapis lazuli powder. After high-temperature firing, anaerobic ammonia oxidation filter media A1-A is obtained. Separately, an adhering liquid containing gypsum, graphite, and pyrite is coated onto the surface of A1, and after high-temperature firing, sulfur autotrophic filter media A1-S is obtained. The obtained filter media A1-A and A1-S can effectively separate anaerobic ammonia oxidation bacteria from sulfur autotrophic bacteria in their ecological niches, avoiding vicious competition between sulfur autotrophic bacteria and anaerobic ammonia oxidation, thereby improving the autotrophic nitrogen removal effect.

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