NDLI: Influence analysis for the behavior of dewaterability of excess sludge in a two-stage vermifilter

Content Provider	Springer Nature Link
Author	Xing, Meiyan Li, Cenran Jiang, Jinzhou Wang, Yin Yang, Jian
Copyright Year	2016
Abstract	To improve excess sludge dewaterability, a two-stage vermifilter was developed to qualitatively and quantitatively analyze sludge physico-chemical properties (fractal dimension, zeta potential, extracellular polymeric substances (EPS), particle size distribution, etc.) and to correlate them with sludge dewatering characteristics (specific resistance to filtration (SRF) and capillary suction time (CST)). Results demonstrated that sludge dewatering performance was significantly improved after the primary vermifilter VF1 and the second-stage vermifilter VF2. In addition, the further VF2 treatment exhibited higher effects on sludge dewatering performance. The particle boundary of sludge after VF2 treatment was clearer and smoother than VF1 sludge (VF1S), apart from the fact that sludge morphological structure got denser and more compact. Comparing with VF1S, the fractal dimension D1 calculated within 1D topological space was closer to 1 after VF2 treatment, and the fractal dimension D2 within 2D topological space closer to 2, indicating a better dewatering performance after VF2 treatment. Additionally, the changes of sludge floc surface properties (such as zeta potential and EPS) resulted in small particles agglomerating into larger ones and then the increase of particle diameter. In summary, the two-stage vermifilter got a better sludge dewatering performance, and thus beneficial for subsequent processing of sludge.
Starting Page	1643
Ending Page	1652
Page Count	10
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	101
Issue Number	4
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-08
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Two-stage vermifilter Dewaterability Sludge morphology Fractal dimension Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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