CAOYu-hao,GUANXi-jun,CHENJi-yang,et al.Effect of Biogas Production on Settling Performance of Anaerobic Granular Sludge with Different Particle Sizes[J].China Water & Wastewater,2024,40(5):82-86.
Effect of Biogas Production on Settling Performance of Anaerobic Granular Sludge with Different Particle Sizes
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第5期
Page:
82-86
Column:
Date of publication:
2024-03-01
- Keywords:
- anaerobic granular sludge; particle size; settling velocity; porosity; methanogenic activity
- Abstract:
- This paper measured the porosity and methanogenic activity of anaerobic granular sludge with particle sizes of 0.3-0.5 mm, 0.5-1 mm, 1-1.5 mm, 1.5-2 mm and greater than 2 mm （abbreviated as R1-R5), calculated the theoretical settling velocity of the sludge with different particle sizes, and compared the actual settling velocity in a clean water column and a nutrient solution column. There was a positive correlation between porosity and particle size, and appropriate porosity was conducive to the settlement of granular sludge. However, excessive porosity affected the sludge density and reduced the settling performance. The granular sludge with particle size of 1.5-2 mm had the maximum methanogenic activity, and the biogas production of the sludge resulted in bubbles to adhere to the surface of the sludge, thereby reducing the settling velocity. The settling velocity of the granules with intermediate particle size (R3 and R4) was most affected by biogas production, and the maximum settling velocity difference between the granular sludge from R4 in the nutrient solution column and the clean water column was -27 m/h.
Last Update:
2024-03-01