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.
不同粒径厌氧颗粒污泥产气作用对沉降性能的影响
- Title:
- Effect of Biogas Production on Settling Performance of Anaerobic Granular Sludge with Different Particle Sizes
- Keywords:
- anaerobic granular sludge; particle size; settling velocity; porosity; methanogenic activity
- 摘要:
- 取粒径为0.3~0.5、0.5~1、1~1.5、1.5~2、>2 mm的厌氧颗粒污泥（记作R1~R5），测定孔隙率和产甲烷活性，计算其在不同粒径下的理论沉降速度，并与其在清水柱和营养柱中的实际沉降速度进行对比。结果表明，孔隙率与颗粒粒径呈正相关，适当的孔隙率有利于颗粒污泥沉降，而过大的孔隙率会影响污泥密度，降低沉降性能。粒径为1.5~2 mm的颗粒污泥产甲烷活性最强，污泥产气会导致气泡黏附在污泥表面，从而降低沉降速度。中间粒径颗粒污泥（R3、R4）的沉降速度受产气作用的影响最大，其中R4颗粒污泥在营养柱与清水柱中的速度沉降差值最大达到-27 m/h。
- 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.
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