Surface properties of sludge and their role in bioflocculation and settleability

Liao, Baoqiang; Allen, D. Grant; Droppo, Ian G.; Leppard, Gary G.; Liss, Steven N.

doi:10.1016/s0043-1354(00)00277-3

Cited by 649 publications

(355 citation statements)

References 49 publications

Supporting

Mentioning

312

Contrasting

Unclassified

Order By: Relevance

“…There is no significant correlation 274 between the total amount of EPS and sludge settleability (Fig. 5a), which is consistent 275 with the results reported by Liao et al [34]. However, the carbohydrates fraction of 276 EPS is positively correlated with SVI (R 2 =0.5990), while the proteins fraction is 277 negatively correlated with SVI (R 2 =0.5073) (Fig.…”

supporting

confidence: 83%

Filamentous and non-filamentous bulking of activated sludge encountered under nutrients limitation or deficiency conditions

Guo

Peng

Yang

et al. 2014

Chemical Engineering Journal

View full text Add to dashboard Cite

supporting

confidence: 83%

Filamentous and non-filamentous bulking of activated sludge encountered under nutrients limitation or deficiency conditions

Guo

Peng

Yang

et al. 2014

Chemical Engineering Journal

View full text Add to dashboard Cite

“…The components and content of EPS heavily depend on many factors such as bacterial type and cultivation time. The relationship between the EPS content and surface characteristics of microorganisms from various origins has been reported (Liao et al 2001;Li and Yang 2007;Fang et al 2015). However, contrary results were always obtained and they seemed to be greatly related to their origins and growth phases.…”

Section: Resultsmentioning

confidence: 99%

“…These properties may be characterized by zeta potential or surface charge, which is widely recognized as a vital factor governing the stability of bioaggregates and directly affects the sludge flocculability and settleability (Alibhai and Forstera 1986;Liao et al 2001;, although zeta potential has been found to be indecisive in drinking-water flocculation using hydrolysable metal salts (Xiao et al 2008). Surface hydrophobicity refers to the propensity of microbial cells being repelled from a mass of water and was shown to be an important factor that determined the relative bacterial adhesion and sludge compression potential (Olofsson et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

2015

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Laboratory experiments were conducted to investigate the correlation of the free cells/aggregated flocs characteristics and the sludge flocculation and separation behavior during the activated sludge process. Activated sludge was cultured in three laboratory-scale batch reactors with same carbon sources of glucose but different sludge retention times (SRTs) of 5, 10 and 20 days. The variation in the operation condition produced sludge with different flocculation and separation characteristics. The reactor performance in terms of bioflocculation as measured by the amount of suspended solids in the effluent, sludge sedimentation and compression as measured by the sludge value index improved considerably as the SRT lengthened. The higher SRT was related to less negatively charged surface of free cells and more hydrophobic of aggregated flocs. The negative zeta potential of aggregated flocs (11-13 mV) was smaller than that of free cells (15-23 mV), and free cells carrying lesser negative surface charges resulted in effluent clarification. Hydrophobicity of aggregated flocs (10-17 %) in each reactor was higher than that of free cells (5-8 %). The increase in hydrophobicity of aggregated flocs had positive effect on settleability. Floc strength measured by breakage/erosion index was closely related to hydrophobicity of aggregated flocs, but no correlation could be established with zeta potential of aggregated flocs. In addition, different bacterial species existed in free cells and aggregated flocs. Microbial similarity between free cells and aggregated flocs increased with shorter SRT and was closely related to effluent clarification.

show abstract

“…3.7 Other conventional method and its disadvantage. 1) Symbiotic algae bacterial wastewater treatment: effect of food to microorganism ratio and HRT on the process performance [7,8,9]. Method: The project "Waste water treatment with symbiotic algae-bacteria-biomass" introduced a symbiosis between micro algae (Chlorella vulgaris sp Hamburg) and activated sludge bacteria to improve the performance of waste stabilization ponds.…”

Section: Advantagesmentioning

confidence: 99%

Optimisation of Secondary Biological Treatment Using Symbiosis of Micro-Algae and Bacteria

2017

IJAERD

View full text Add to dashboard Cite

show abstract

Surface properties of sludge and their role in bioflocculation and settleability

Cited by 649 publications

References 49 publications

Filamentous and non-filamentous bulking of activated sludge encountered under nutrients limitation or deficiency conditions

Filamentous and non-filamentous bulking of activated sludge encountered under nutrients limitation or deficiency conditions

Characteristics of free cells and aggregated flocs for the flocculation and sedimentation of activated sludge

Optimisation of Secondary Biological Treatment Using Symbiosis of Micro-Algae and Bacteria

Contact Info

Product

Resources

About