• 关键词：硫自养反硝化  流化床  悬浮填料  硫源  饮用水  脱氮

• 基金项目：国家重点研发计划（No.2019YFC1907603）；中国科学院前沿科学重点研究项目（No.ZDBS-LY-DQC014）

• 田家宇
• 河北工业大学土木与交通学院，天津 300401

• 刘哲颖
• 河北工业大学土木与交通学院，天津 300401;中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085

• 古振澳
• 中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085

• 马方凯
• 长江勘测规划设计研究有限责任公司，武汉 430010

• 邵军荣
• 长江勘测规划设计研究有限责任公司，武汉 430010

• 胡承志
• 中国科学院生态环境研究中心，环境水质学国家重点实验室，北京 100085

• 摘要：针对饮用水硝酸盐污染和固定床硫自养反硝化脱氮负荷低等问题，开展流化床型硫自养反硝化脱氮研究，探究聚乙烯醇-海藻酸钠-活性炭悬浮填料对硫自养反硝化的影响，并对比了不同硫源（升华硫、硫代硫酸钠和生物硫）对反硝化效果的影响.结果表明，悬浮填料可显著提升 反硝化脱氮效果，升华硫与硫代硫酸钠效果优于生物硫.在最佳条件下，TN去除率可稳定保持在98.49%，TN脱氮负荷达2.84 g·L^-1·d^-1.机理分析表明，悬浮填料中海藻酸钠可作为异养反硝化的有机碳源，实现自养与异养反硝化相结合，减少了副产物NO₂^-和SO₄^2-的生成，并提供碱度， 保持体系pH的稳定.加入悬浮填料后，反硝化微生物生长得到促进，优势菌属为Thauera（兼性自养反硝化菌）和Brachymonas（异养反硝化菌）.

• Abstract：Aiming at the problems of nitrate pollution in drinking water and low nitrate removal rate of fixed bed sulfur autotrophic denitrification reactor， research on fluidized bed type sulfur autotrophic denitrification was carried out. The effect of polyvinyl alcohol-sodium alginate-activated carbon suspended filler on sulfur autotrophic denitrification was investigated， and the effect of different sulfur sources （sublimated sulfur， sodium thiosulfate， and biological sulfur） on the denitrification process was compared. The results showed that the suspended filler could significantly enhance the denitrification performance. Meanwhile， the denitrification performance of sublimation sulfur and sodium thiosulfate was better than that of biological sulfur. Under the optimal conditions， the removal efficiency of total nitrogen （TN） could be stably maintained at 98.49%， with the corresponding denitrification load reaching 2.84 g·L^-1·d^-1. Mechanistic analysis showed that sodium alginate in the suspended filler could be used as an organic carbon source for heterotrophic denitrification to realize the combination of autotrophic and heterotrophic denitrification. The mixotrophic denitrification process reduced the generation of by-products NO₂^- and SO₄^2-， and provided alkalinity to keep a constant pH of the system. The growth of denitrifying microorganisms was promoted by the addition of suspended filler， and the dominant genera were Thauera （parthenogenic autotrophic denitrifying bacteria） and Brachymonas （heterotrophic denitrifying bacteria）.

• Key words：sulfur autotrophic denitrification  fluidized bed  suspended filler  sulfur source  drinking water  nitrate removal

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