ZHUWen-fang,YELei,CHENWan-nian,et al.Effect and Mechanism of Pyrrhotite Promoting the Formation of Aerobic Granular Sludge[J].China Water & Wastewater,2024,40(13):14-20.
Effect and Mechanism of Pyrrhotite Promoting the Formation of Aerobic Granular Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第13期
Page:
14-20
Column:
Date of publication:
2024-07-01
- Keywords:
- aerobic granular sludge; pyrrhotite; extracellular polymeric substances (EPS); interface energy; hydrophobicity
- Abstract:
- Four sequencing batch reactors (SBRs) were operated at room temperature so as to investigate the effect of natural pyrrhotite on the granulation process of aerobic granular sludge (AGS) in the treatment of dye wastewater. The changes in SVI, particle size, and Zeta potential of AGS during the granulation process were studied by changing the influent organic load and carbon source. The formation mechanism of AGS was analyzed by three-dimensional excitation emission matrix fluorescence spectrophotometer（3D-EEM）of AGS components and variation in the interface energy of pyrrhotite. The results showed that AGS were formed in about 20 days after adding pyrrhotite. When high organic loading rate and sodium acetate (NaAc) carbon source were used , the average SVI value decreased from 105 mL/g at initial operation to (25.99±4.57) mL/g at final run. 3D-EEM analysis revealed that the addition of pyrrhotite could increase the conentration of sludge hydrophobic protein and promote the formation of AGS. In the process of granulation, the adhesion work of the pyrrhotite liquid-solid interface gradually decreased, while the interface energy increased, which also stimulated the formation of AGS.
Last Update:
2024-07-01