Sulfur element slow-release carrier for biochemical denitrification and preparation method of sulfur element slow-release carrier

By using a gradient structure and pH-responsive mechanism, the slow-release carrier of elemental sulfur solves the problems of uneven release rate and pH fluctuation, achieving stability and high efficiency in the denitrification process, reducing costs, and making it suitable for water treatment in complex environments.

CN121318007AActive Publication Date: 2026-01-13SHENZHEN YUFENG ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202511577946.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-31
Publication Date
2026-01-13
Estimated Expiration
2045-10-31

AI Technical Summary

Technical Problem

Existing slow-release carriers for sulfur have uneven release rates and poor environmental adaptability during denitrification. pH fluctuations inhibit the activity of denitrifying bacteria, and traditional methods require the addition of an alkali source to adjust the pH, increasing operating costs and complexity.

Method used

A gradient-structured slow-release carrier for elemental sulfur, combined with a pH-responsive mechanism, utilizes agricultural waste carbonization to form a porous carbon-based substrate. Through a three-layer gradient structure (outer, middle, and inner layers) and pH-sensitive functional materials, it achieves stable release of elemental sulfur and adaptive pH regulation of the reaction system.

Benefits of technology

It improves denitrification efficiency, reduces operating costs, is suitable for water treatment in complex environments, and ensures the stability and efficiency of the denitrification process.

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Abstract

The invention discloses an elemental sulfur slow-release carrier for biochemical denitrification and a preparation method of the elemental sulfur slow-release carrier. The carrier takes agricultural waste as a base material, a porous carbon-based material is formed through carbonization treatment, and stable slow release of elemental sulfur is realized through gradient structure design. The outer layer is a mixture of elemental sulfur and a carbon-based substrate, the middle layer is an equivalent mixture, and the inner layer is a mixture of elemental sulfur and a slow-release carbon source, so that the denitrification requirement of low-C / N-ratio sewage is met. Meanwhile, a pH response mechanism is introduced into the carrier, and the stability of a reaction system is maintained through self-adaptive regulation and control of a microencapsulated alkali source when the pH is changed. The preparation process adopts low-temperature pressing and microwave curing, and is energy-saving and environment-friendly. The technology has the advantages of low cost, high efficiency and environmental protection, and is suitable for the field of environmental protection.
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