污水硫自养反硝化技术研究进展

硫自养反硝化（SAD）是一种绿色低碳的污水脱氮技术，具有成本低、污泥产量少、无须外加有机碳源等优点，已成为污水脱氮技术研究的热点之一。阐述SAD填料组成与复合硫源填料的合成方法，归纳SAD固定床反应器和流化床反应器的结构及其适用条件，回顾SAD与电化学、异养反硝化、厌氧氨氧化耦合工艺等方面的研究进展，并总结SAD耦合技术的优缺点以及耦合工艺的脱氮特征。微生物的代谢功能是实现高效SAD的关键因素，列举不同代谢特性的SAD功能微生物种类，阐述代表性微生物Thiobacillus和Sulfurimonas在SAD过程中的反硝化特性及其生长条件。目前，SAD技术在填料、反应器和耦合工艺等方面取得显著进步，但仍面临诸多挑战，在SAD技术温度适应性、高处理负荷反应器设计以及工艺流程优化等方面进一步创新。

Research progress of sulfur autotrophic denitrification in wastewater

Sulfur autotrophic denitrification (SAD) has become one of the hotspots in nitrogen removal technology during wastewater treatment because of its characteristic green and low-carbon technology for nitrogen removal from sewage, which has the advantages of low cost, low sludge yield and no need for organic carbon sources. In this paper, the research progress on SAD of carrier compositions and synthesis method of composite sulfur source filler. The structure and applicable conditions of SAD packed bed reactor and fluidized bed reactor were summarized. The research progress of SAD coupled with electrochemical, heterotrophic denitrification and Anammox technology was reviewed. The advantages and disadvantages of SAD coupled technology were summarized. The metabolic function of microorganisms is a key factor in the realization of effective SAD. This review enumerates the types of SAD functional microorganisms with different metabolic characteristics, the denitrification characteristics and growth conditions of Thiobacillus and Sulfurimonas in the SAD process were described. Currently, SAD technology has made significant progress in the fields of filler, reactor and coupling process, but still faces many challenges, further innovations have been made in temperature adaptability of SAD technology, reactor design with high treatment load, and process optimization.