Abstract:

The problems in traditional enhanced nitrogen removal process of carbon source dosage, high cost, and unstable operation was solved by heterotrophic-sulfur autotrophic denitrification synergistic process. The results showed that the effluent NO₃ ^--N concentration was lower than the minimum detection limit,and there was no NO₂ ^--N accumulation when the hydraulic retention time was 3 h, the NO₃ ^--N loading was 2.70 mg/(L·h), the exogenous carbon source was 7 mg/L. Under heterotrophic-sulfur autotrophic synergistic conditions, the relative abundance of sulfur autotrophic denitrifying bacteria(Sulfuritalea, Thiobacillus, and Methyloversatilis) was increased and the interactions with mixotrophic denitrifying bacteria was enhanced. The relative abundance of sulfur dispersing bacteria(Treponema) was decreased and interactions with the other bacteria was weakened, which were the main reasons for the reduction of SO₄ ^2- in the effluent.

Key words: enhanced nitrogen removal, sulfur-autotrophic denitrification, sulfur disproportionation, co-occurrence networks of microbial

摘要：

通过异养-硫自养协同工艺解决传统深度脱氮工艺碳源投加量大、成本高、运行不稳定的问题。结果表明：HRT=3 h，NO₃ ^--N负荷为2.70 mg/（L·h），添加外源碳源为7 mg/L时，出水NO₃ ^--N低于最低检测限，且没有NO₂ ^--N积累；在异养-硫自养协同条件下，硫自养反硝化细菌（Sulfuritalea、Thiobacillus和Methyloversatilis）相对丰度增加且与兼养反硝化菌之间的相互作用关系增强，硫歧化细菌（Treponema）相对丰度减少且与其他菌的相互作用关系减弱，是出水SO₄ ^2-减少的主要原因。

关键词: 深度脱氮, 硫自养反硝化, 硫歧化, 微生物共现网络

CLC Number: 

• X703.1