WANGHong-bo,ZHENGXiao-ying,WANGWei,et al.Influence of Different Start-up Mode on the Effect of Autotrophic Denitrification of Composite Sulfur Fillers[J].China Water & Wastewater,2023,39(5):9-16.
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Influence of Different Start-up Mode on the Effect of Autotrophic Denitrification of Composite Sulfur Fillers

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第5期 Page: 9-16 Column: Date of publication: 2023-03-01
Author(s):
WANG　Hong-bo1;  ZHENG　Xiao-ying1;  WANG　Wei2; 3;  LI　Kui-xiao2; 3
（1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering， Beijing University of Technology， Beijing 100124， China； 2. Beijing Drainage Group Co. Ltd.， Beijing 100044， China； 3. Technology R&D Center of Beijing Urban Drainage Group Co. Ltd.， Beijing 100124， China）
Keywords:
secondary effluent;  sulfur autotrophic denitrification;  biofilm formation mode;  denitrification effect;  population structure
Abstract:
In order to find a suitable start-up method for sulfur autotrophic denitrification technology in engineering applications, the effects of three different start-up mode on the denitrification effect were compared,which included variable filtration rate inoculated biofilm formation, variable filtration rate natural biofilm formation and fixed filtration rate natural biofilm formation. The results showed that the inoculated biofilm formation had no significant advantages in engineering applications. The variable filtration rate natural biofilm formation had the best denitrification effect, and its maximum denitrification load was 0.81 kg/(m3·d). By analyzing the changes of parameters such as pH, dissolved oxygen and SO42-, it was found that the process of biofilm formation would reduce the effluent pH, and high DO in the influent would inhibit the denitrification process. Some aerobic bacteria may use dissolved oxygen to oxidize elemental sulfur to SO42-, so that the average increase of SO42- was higher than the theoretical value. The characteristics of the microbial community structure in the system were analyzed by high-throughput sequencing. The dominant bacteria at the genus level for sulfur autotrophic denitrification in the reactor were Thiobacillus and Thermomonas, with relative abundances of 6.38% and 3.86%,respectively. Compared with the reflux sludge from secondary sedimentation tank, the microbial community structure in the reactor had an obvious domestication process.
Last Update: 2023-03-01