Filamentous sludge bulking control by nano zero-valent iron in activated sludge treatment systems

2014 ◽  
Vol 16 (12) ◽  
pp. 2721-2728 ◽  
Author(s):  
Shengnan Xu ◽  
Minghao Sun ◽  
Chiqian Zhang ◽  
Rao Surampalli ◽  
Zhiqiang Hu
Keyword(s):  
Water Quality ◽  
Activated Sludge ◽  
Zero Valent Iron ◽  
Effluent Water ◽  
Sludge Treatment ◽  
Sludge Bulking ◽  
Nano Zero Valent Iron

Sludge bulking causes loss of biomass in the effluent and deterioration of effluent water quality.

Improvement of the thickening and dewatering characteristics of activated sludge by electroflotation (EF)

2005 ◽  
Vol 52 (10-11) ◽  
pp. 219-226 ◽  
Author(s):  
Y.G. Choi ◽  
H.S. Kim ◽  
Y.H. Park ◽  
S.H. Jeong ◽  
D.H. Son ◽  
...  
Keyword(s):  
Water Quality ◽  
Activated Sludge ◽  
Solid Content ◽  
Laboratory Scale ◽  
Volume Reduction ◽  
Air Bubbles ◽  
Effluent Water ◽  
Gravity Thickening

The performances of electroflotation (EF) on the thickening of activated sludge were investigated using laboratory scale batch flotation reactors. Four activated sludges including bulking sludges were tested. After 30minutes of EF operation, 57–84% of sludge volume reduction could be achieved by EF, while only about 1.5–14% could be obtained by gravity thickening for the same period. After thickening the effluent water quality in terms of TCOD, SS, and turbidity was improved by EF operation for all sludge samples. In addition, the EF thickened sludge showed much better dewaterability both in SRF and cake solid content. It is induced that the air bubbles entrapped in the thickened sludge play a key role in the observed dewaterbility improvement.

Source characterization and removal of N-nitrosamine precursors during activated sludge treatment

2020 ◽  
Vol 6 (9) ◽  
pp. 2432-2443
Author(s):  
Xiaolu Zhang ◽  
Daekyun Kim ◽  
David L. Freedman ◽  
Tanju Karanfil
Keyword(s):  
Water Quality ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Source Water ◽  
Source Characterization ◽  
Sludge Treatment ◽  
Potential Source ◽  
Source Water Quality

Municipal wastewater discharges after secondary biological treatment (e.g., the activated sludge (AS) process) are a major potential source of N-nitrosamine precursors which may impact downstream source water quality.

Activated Sludge Treatment of Coal-Gasification Effluent in a Petrochemical Plant – II. Metal Accumulation by Heterotrophic Bacteria

1989 ◽  
Vol 21 (4-5) ◽  
pp. 297-303 ◽  
Author(s):  
H. C. Kasan ◽  
A. A. W. Baecker
Keyword(s):  
Activated Sludge ◽  
Coal Gasification ◽  
Bacterial Population ◽  
Metal Accumulation ◽  
Heterotrophic Bacteria ◽  
Petrochemical Plant ◽  
Effluent Water ◽  
Sludge Treatment ◽  
Reclamation System ◽  
Metal Tolerant Bacteria

The metal-tolerant bacterial population of an activated sludge process treating coal gasification effluent in a zero-effluent water reclamation system was studied. Atomic absorption analyses of liquid and solids fractions of sludge showed that Fe, Cr, Zn, Ag, Hg, Cu, Cd, Pb, Ni, and Co were present in decreasing concentrations respectively, and that in all cases solids fractions contained highest metal concentrations. Seventeen metal-tolerant bacteria were isolated from the sludge and were shown to remove metals from broths in which they grew. In further broths also containing 100 mg ℓ−1 of metal ions, Pseudomonascepacia, Flavobacterium sp., Ps. sp., and Enterobacteraerogenes effected biosorption of iron; Ps. maltophila and Ps. paucimobilis (Strain 2) biosorbed copper; Ps. cepacia (strain 1) and Aeromonashydrophila biosorbed zinc; Ps. pseudomallei and Ps. cepacia (strain 1) biosorbed chromium, and Ps. cepacia (strain 2) and Zoogloea sp. effected biosorption of nickel.

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