MAJun,ZHANGYa-bin,LIZhi-guo,et al.Aerobic Granular Sludge for Treatment of Sewage from Highway Service Areas: A Pilot-scale Study[J].China Water & Wastewater,2024,40(23):20-28.
Aerobic Granular Sludge for Treatment of Sewage from Highway Service Areas: A Pilot-scale Study
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第23期
Page:
20-28
Column:
Date of publication:
2024-12-01
- Keywords:
- sewage from highway service area; aerobic granular sludge; microbial community; pilot-scale test
- Abstract:
- Aerobic granular sludge (AGS) technology has the advantages of small footprint, low energy consumption and operating costs, and is considered to be one of the potential mainstream technologies for biological sewage treatment in the future. This paper conducted pilot-scale aerobic granular sludge domestication under the conditions of high ammonia nitrogen concentration and low carbon-nitrogen ratio in sewage from a highway service area in Henan Province, and the stability of AGS process under different loads, temperatures and operation mode was explored. The results showed that stable aerobic granular sludge could be formed during the sewage treatment process, with a sludge concentration (MLSS) as high as 12 337 mg/L, and SVI30/SVI5 close to 1.0. During the low-temperature operation period in winter, due to the growth of filamentous bacteria inside the granular sludge, SVI30 increased slightly, but remained below 50 mL/g; Meanwhile, by adjusting the running time of the cycle, reducing aeration volume, efficient and stable removal of ammonia nitrogen and total inorganic nitrogen could be achieved under low temperature. Microbial diversity analysis results showed that in the anaerobic/aerobic operation mode, nitrogen-related bacterial groups such as Candidatus_Nitrotoga,Thauera and Rhodobacter were enriched in the system and gradually became dominant bacterial species, thus ensuring good nitrogen removal performance.In addition, bacterial genera such as Flavobacteria (2.19%) and unclassified_o__Saccharimonadales (0.60%-2.44%), which could secrete a large amount of extracellular polymers, helped enhance the hydrophobicity of granular sludge, thereby improving its coagulation performance and promoting the formation and long-term stability of granular sludge.
Last Update:
2024-12-01