环境工程学报2025，Vol.19Issue(3)：697-708,12.DOI:10.12030/j.cjee.202411028
纳米零价铁强化硫自养反硝化脱氮性能
Enhanced nitrogen removal performance of sulfur autotrophic denitrification with nano zero-valent iron
摘要
Abstract
Nitrate(NO3--N)pollution has become one of the most significant water quality issues.Sulfur(S0)autotrophic denitrification processes are gaining widespread attention due to their low cost and minimal sludge production.To further enhance nitrogen removal efficiency,the impacts of iron media on the denitrification rate,denitrification efficiency,and microbial community structure in S0 autotrophic denitrification processes were investigated.Through batch experiments,it was determined that nano zero-valent iron(Fe0)could enhance the nitrogen removal performance of sulfur autotrophic denitrification,with a corresponding NO3--N removal rate of 8.04 mg·(L·d)-1 at the optimal dosage of 0.48 g·L-1,which was 1.87 times that of the control group.The NO3--N removal process followed a first-order kinetic model,with the reaction rate constant being 4.46 times that of the control group.Fe0 enhanced nitrogen removal mainly through stimulating the secretion of extracellular polymeric substances in microorganisms,increase the activity of electron transfer and accompanied chemical interactions.Continuous operation experiments revealed that the stability of the S0 autotrophic denitrification system was enhanced with the continuous addition of 0.48 g·L-1 Fe0.When the influent load of NO3--N increased from 0.14 kg·(m3·d)-1 to 0.32 kg·(m3·d)-1,the effluent total nitrogen(TN)consistently met the Class Ⅴwater quality standards(＜2 mg·L-1)according to the"Surface Water Environmental Quality Standards"(GB3838-2022),achieving this at least 5 days faster than the system without Fe0 addition.Microbial community analysis showed that the continuous addition of Fe0 increased the abundance of dominant autotrophic denitrifying bacterial groups(such as Thiobacillus,Sulfurimonas,Ferritrophicum).The research findings can provide a data support for the enhancement of nitrogen removal performance in S0 autotrophic denitrification processes with Fe0.关键词
硫自养反硝化/脱氮速率/纳米零价铁/电子传递系统活性/微生物群落Key words
sulfur autotrophic denitrification/denitrification rate/nano zero-valent iron/activity of electron transport system/microbial community分类
资源环境引用本文复制引用
刘柏利,邢琳琼,王亚静,刘艳芳,陈静,钟雨..纳米零价铁强化硫自养反硝化脱氮性能[J].环境工程学报,2025,19(3):697-708,12.基金项目
河北省重点研发项目(21373602D) （21373602D）
