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

By preparing a foamed porous core-shell type anaerobic ammonia oxidation-sulfur autotrophic composite filter media, the competition between sulfur autotrophic bacteria and anaerobic ammonia oxidizing bacteria in the anaerobic ammonia oxidation coupled sulfur autotrophic system was solved, realizing efficient autotrophic denitrification and resource utilization of waste materials.

CN120097510BActive Publication Date: 2026-07-10SHENZHEN ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
Filing Date
2025-04-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing anaerobic ammonia oxidation coupled with sulfur autotrophic systems suffer from vicious competition between sulfur autotrophic bacteria and anaerobic ammonia oxidizing bacteria, as well as sulfide toxicity, resulting in low denitrification efficiency and difficulty in stable operation.

Method used

The filter media is made of foamed porous core-shell type anaerobic ammonia oxidation-sulfur autotrophic composite material. The surface of the filter media is coated with mineral particles such as dolomite, siderite, and lapis lazuli, as well as gypsum, graphite, and pyrite particles through electrostatic spray adhesion technology. This forms an internal foamed porous structure, which separates the ecological niches of anaerobic ammonia oxidation bacteria and sulfur autotrophic bacteria, thus avoiding competition.

Benefits of technology

It achieves highly efficient autotrophic denitrification, avoids the inhibition of anaerobic ammonia oxidation by sulfur autotrophic bacteria, improves the denitrification rate and saves on alkalinity dosage, and realizes the resource utilization of waste materials.

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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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