复合硫源自养反硝化脱氮性能研究

Study on Nitrogen Removal Performance of Composite Sulfur-Based Autotrophic Denitrification

摘要: 针对单一硫源自养反硝化启动慢、脱氮效率受限的特点，采用硫铁矿自养反硝化和硫磺自养反硝化耦合的复合硫源自养反硝化，通过批次实验探究硫铁矿/硫磺不同配比的复合硫源自养反硝化系统在不同水力停留时间(HRT)和不同${\text{NO}}_3^{-}$ 浓度下的脱氮性能。结果表明，相较于单一硫源，硫铁矿:硫磺 = 1:1的脱氮性能较为突出，在HRT = 4 H，进水${\text{NO}}_3^{-}$ 分别为10 mg/L、20 mg/L、30 mg/L、40 mg/L条件下，硫源比为1:1的自养系统平均去除率分别达到92.6%、92.5%、90.5%、80.7%,主要的优势菌属为norank_f__PHOS-HE36和Ferritrophicum。

Abstract: In response to the slow startup and limited nitrogen removal efficiency caused by a single sulfur source in autotrophic denitrification, a composite sulfur source autotrophic denitrification system was developed by coupling iron sulfide mineral autotrophic denitrification with sulfur autotrophic denitrification. Batch experiments were conducted to investigate the denitrification performance of the composite sulfur source autotrophic denitrification system with different ratios of iron sulfide mineral to sulfur under varying hydraulic retention times (HRT)and nitrate (${\text{NO}}_3^{-}$ )concentrations. The results showed that, compared to using a single sulfur source, the denitrification performance was more pronounced with a sulfur source ratio of 1:1 (iron sulfide mineral to sulfur). At an HRT of 4 hours and influent nitrate concentrations of 10 mg/L, 20 mg/L, 30 mg/L, and 40 mg/L, the average nitrate removal efficiencies of the autotrophic system with a 1:1 sulfur source ratio reached 92.6%, 92.5%, 90.5%, and 80.7%, respectively. The dominant functional bacteria were identified as norank_f__PHOS-HE36 and Ferritrophicum.