工业水处理 ›› 2025, Vol. 45 ›› Issue (1): 41-48. doi: 10.19965/j.cnki.iwt.2023-1149

• 试验研究 • 上一篇    下一篇

硫/钢渣复合基质去除低碳源地表水中硝酸盐

彭先春1(), 郑丽丽2, 鹿浩然1, 王赭枫1, 朱正1, 梁文艳1()   

  1. 1. 北京林业大学环境科学与工程学院北京市水污染源头控制技术重点实验室,北京 100083
    2. 诚合瑞正风险管理咨询有限公司,北京 100041
  • 收稿日期:2024-10-25 出版日期:2025-01-20 发布日期:2025-01-22
  • 作者简介:

    彭先春(1998— ),硕士。E-mail:

    梁文艳,教授。E-mail:

  • 基金资助:
    国家自然科学基金项目(51672028); 水体污染控制与治理技术重大专项(2018ZX07110-003)

Performance of sulfur/steel slag composite matrix in removing nitrate from surface water with low-carbon content

Xianchun PENG1(), Lili ZHENG2, Haoran LU1, Zhefeng WANG1, Zheng ZHU1, Wenyan LIANG1()   

  1. 1. Beijing Key Laboratory of Water Pollution Source Control Technology, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
    2. Chenghe Ruizheng Risk Management Consulting Co. , Ltd. , Beijing 100041, China
  • Received:2024-10-25 Online:2025-01-20 Published:2025-01-22

摘要:

氮污染物的积累极易导致水体富营养化,NO3 --N是主要的氮污染物之一。使用钢渣与单质硫复合基质进行硫自养反硝化,利用SEM观察钢渣使用前后的表面形貌和微生物附着生长情况,采用XRD对比钢渣与石灰石的碱性差异,通过厌氧瓶批次实验对比了硫/钢渣与硫/石灰石体系的脱氮性能,探讨了投加质量比与投加量对硫/钢渣体系脱氮性能的影响,分析了硫自养反硝化前后的微生物群落结构特征。结果显示,钢渣含有Ca(OH)2、CaCO3、CaO、MgO、Ca2SiO4、Ca3SiO5和RO相等丰富的碱性物质,硫/钢渣体系相比硫/石灰石体系具有更强的脱氮性能。硫/钢渣投加质量比为1∶1且投加量均为20 g时,硫/钢渣体系脱氮效果最佳,TN去除率在第10天达到92.5%,高于硫/石灰石体系的87.4%。当硫和钢渣的投加量均超过20 g时,体系对TN和NO3 --N去除效果提升不显著。微生物群落结构分析显示,起反硝化作用的微生物属于Proteobacteria(变形菌门)和Bacteroidota(拟杆菌门),相比硫/石灰石体系,硫/钢渣体系中微生物更加丰富,也更加稳定。

关键词: 硫自养反硝化, 钢渣, 硝酸盐氮, 微生物群落

Abstract:

The accumulation of nitrogen pollutants can easily lead to eutrophication of water bodies, and NO3 --N is one of the main nitrogen pollutants. A composite matrix of steel slag and elemental sulfur was used for sulfur autotrophic denitrification. SEM was used to observe the surface morphology and microbial adhesion growth on steel slag before and after use. XRD was used to compare the alkalinity difference between steel slag and limestone. Anaerobic bottle batch experiments were conducted to compare the denitrification performance of sulfur/steel slag and sulfur/limestone systems. The effects of mass ratio and dosage on the denitrification performance of sulfur/steel slag systems were explored, and the microbial community structure characteristics before and after sulfur autotrophic denitrification were analyzed. The results showed that steel slag contained abundant alkaline substances such as Ca(OH)2, CaCO3, CaO, MgO, Ca2SiO4, Ca3SiO5, and RO phase. The sulfur/steel slag system had stronger denitrification performance compared to the sulfur/limestone system. When the mass ratio of sulfur/steel slag was 1∶1 and dosages were 20 g, the denitrification effect of the system was the best, and the TN removal rate reached 92.5% on the 10th day, which was higher than 87.4% of the sulfur/limestone system. When the dosage of sulfur and steel slag exceeded 20 g, the system had no significant effect on improving the removal of TN and NO3 --N. The analysis of microbial community structure showed that the microorganisms responsible for denitrification belonged toProteobacteria and Bacteroidota. Compared with the sulfur/limestone system, the microbial diversity in the sulfur/steel slag system was more abundant and the microorganisms were more stable.

Key words: sulfur autotrophic denitrification, steel slag, nitrate nitrogen, microbial communities

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