化工环保2025，Vol.45Issue(5)：674-681,8.DOI:10.3969/j.issn.1006-1878.2025.05.011
硫基复合滤料强化硫自养/异养协同反硝化脱氮
Preparation of sulfur-based composite filter material and enhancement of sulfur autotrophic/heterotrophic synergistic denitrification performance
摘要
Abstract
Sulfur-based composite filter material were prepared using white cement,bentonite,polycaprolactone(PCL),elemental sulfur,and eggshell powder as raw materials by regulating the electron donor ratio between autotrophic and heterotrophic denitrification pathways(e-auto∶e-hetero).The experimental results demonstrate that the addition of CaCO3 helps maintain the pH of the sulfur-autotrophic denitrification system.The optimal denitrification performance is achieved at a molar ratio of S0 to CaCO3(S/CaCO3)of 2.40,where the nitrate nitrogen(NO3--N)concentration decreases from approximately 45 mg/L to 2.96 mg/L after 36 h of operation.When the electron donor ratio(e-auto∶e-hetero)is set at 1∶2.0—i.e.,in the reactor packed with SAH-Ⅳ—the denitrification performance reaches its optimum,with NO3--N removal efficiency exceeding 98%,and no accumulation of nitrite nitrogen(NO2--N)is observed throughout the operation.A sulfur-autotrophic/heterotrophic synergistic denitrification biofilter constructed with SAH-Ⅳ as the packing material achieves a stable NO3--N removal efficiency of approximately 65%under conditions of a NO3--N load of 0.3 kg/(m3·d)and a hydraulic retention time of 2.4 h.Competitive interactions are observed between heterotrophic and sulfur-autotrophic denitrifying bacteria in the biofilter.The presence of organic matter promotes the enrichment of heterotrophic denitrifiers but inhibits the growth of sulfur-autotrophic denitrifying bacteria.关键词
复合滤料/硫磺/聚己内酯/自养/协同反硝化Key words
composite filter material/elemental sulfur/polycaprolactone/autotrophic/synergistic denitrification分类
环境科学引用本文复制引用
姜峻韬,宋艳珂,李晋,詹亚力,王庆宏,陈春茂..硫基复合滤料强化硫自养/异养协同反硝化脱氮[J].化工环保,2025,45(5):674-681,8.基金项目
中国石油科技创新基金项目(2024DQ02-0405) （2024DQ02-0405）
中国石油大学(北京)科研基金项目(2462024SZBH002). （北京）
