HU Xiao-bing,ZHANG-Lin,WANG-Kun,et al.Sludge Volume Index Prediction of Filamentous Bulking Sludge Based on Floc Structure Index[J].China Water & Wastewater,2022,38(2022 1 1):16-22.
Sludge Volume Index Prediction of Filamentous Bulking Sludge Based on Floc Structure Index
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
16-22
Column:
Date of publication:
2022-01-01
- Keywords:
- filamentous bulking sludge; indicator of floc structure; sludge volume index (SVI); principal component analysis; predictive function
- Abstract:
- Five comprehensive indicators, namely floc size (SZ), stretchability (ST), compactness (CP), regularity (RG) and filamentous bacteria (FL), reflecting the microscopic floc structure characteristics of activated sludge were selected to establish a more accurate method for characterizing the settleability of bulking activated sludge. The possibility of dimensionality reduction of many characteristic parameters was analyzed, and the structural characteristic index system of filamentous bulking sludge floc was established. The relationship between the structural characteristics of bulking sludge floc and sludge volume index (SVI) was explored by using partial least squares regression (PLS) method, so as to establish a SVI prediction function of bulking sludge. There were good correlations among the characteristic parameters of sludge floc, and principal component analysis (PCA) method could be employed to reduce the dimensionality. There was a strong linear correlation (R2=0.779) between the structural characteristics of sludge floc and SVI of filamentous bulking activated sludge, and a SVI prediction model was established based on the linear correlations. There was a strong linear correlation between the measured and the predicted SVI value of filamentous bulking sludge (R2=0.801), indicating that the model could predict filamentous bulking sludge well.
Last Update:
2022-01-01