The influence of multivalent cations on the flocculation of activated sludge with different sludge retention times

Li, Haisong; Wen, Yue; Cao, Asheng; Huang, Jingshui; Zhou, Qi

doi:10.1016/j.watres.2014.02.014

Cited by 53 publications

(20 citation statements)

References 35 publications

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“…Since the pellet is core of AS, TB is located on the surface of pellet and combined strongly with cell wall, a great percentage of Fe 3+ accumulated in the TB or pellet indicated that higher binding ability of that Fe 3+ to the AS. It can be explained that the trivalent cations possess higher valence states, polarizability and relatively smaller degree of hydration compared to bivalent or monovalent cations (Li et al, 2014), thus, most trivalent cations will tightly embedded in the TB or pellet in AS. Fig.…”

Section: Distributions Of Cations In Asmentioning

confidence: 99%

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Zhang

Wang

Zhang

et al. 2014

Bioresource Technology

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Section: Distributions Of Cations In Asmentioning

confidence: 99%

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Zhang

Wang

Zhang

et al. 2014

Bioresource Technology

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“…Factors such as water temperature 22 , dissolved oxygen (DO) 3 , sludge retention time (SRT) 23 , pH 24 , influent quality 25 , nutrient ratio 26 and sludge loading 27 are responsible for filamentous sludge bulking. The microbial community responsible for sludge bulking varies depending on the water quality and operational conditions.…”

Section: Introductionmentioning

confidence: 99%

The microbial community in filamentous bulking sludge with the ultra-low sludge loading and long sludge retention time in oxidation ditch

Zhang

Yao

Wang

et al. 2019

Sci Rep

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Sludge bulking is a major problem that restricts the development of the activated sludge process. The microbial community responsible for sludge bulking varies depending on water quality and operational conditions. This study analysed the microbial community of bulking sludge in oxidation ditch with ultra-low sludge loading and long sludge retention time using high-throughput sequencing. The study found that the relative abundance of bacterial genus Saprospiraceae_norank was the highest in bulking sludge, reaching 13.39–28.83%, followed by Comamonadaceae_unclassified, Ardenticatenia_norank and Tetrasphaera, with the relative abundance of 4.59–11.08%, 0.52–16.60% and 0.17–8.92% respectively. In contrast, the relative abundance of bacteria that easily caused sludge bulking including Microthrix (0.54–2.47%), Trichococcus (0.32–1.71%), Gordonia (0.14–1.28%), and Thiothrix (0.01–0.06%) were relatively low. Saprospiraceae_norank was predominant and induced sludge bulking in oxidation ditch. The relative abundance of fungal genus Trichosporon was the highest in bulking sludge, reaching 16.95–24.98%, while other fungal genera were Saccharomycetales_unclassified (5.59–14.55%), Ascomycota_norank (1.45–13.51%), Galactomyces (5.23–11.23%), and Debaryomyces (7.69–9.42%), whereas Trichosporon was the dominant fungal genus in bulking sludge. This study reported that excessive Saprospiraceae_norank can induce sludge bulking for the first time, which provides important knowledge to control sludge bulking.

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“…Conditioning increases particle sizes by combining small, colloidal particles into larger, cohesive aggregates. This chemical conditioning is done using inorganic, multivalent cationic coagulants such as aluminum (Al) or iron (Fe) salts or with synthetic polyelectrolytes such as synthetic polyacrylamides (PAM) [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Cationic nanocelluloses in dewatering of municipal activated sludge

Suopajärvi

Sirviö

Liimatainen

2017

Journal of Environmental Chemical Engineering

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This study used cationic nanocelluloses (CNFC I and II) produced by nanofibrillizing periodate oxidized and aminoguanidine hydrochloride reacted wood cellulose as flocculation agents for municipal activated sludge. For both CNFC I and II, the diameters ranged from about 2-8 nm. Lengths ranged from hundreds of nanometers for CNFC I and about 50-100 nm for CNFC II. The charge densities for CNFC I and II were 1.07 and 1.70 meq g -1 , respectively. The study examined the flocculation performance of the two CNFCs in the conditioning treatment of municipal activated sludge and compared the results with the performance of both a commercial coagulant and polyelectrolyte (polyacrylamide).Results showed that both CNFC I and II were able to flocculate activated sludge efficiently at effective doses similar to those of the commercial cationic polymer and at doses lower than the reference coagulant. Their efficiency in reducing turbidity was nearly as good as that of the synthetic reference polymer, and their COD was even better than that of the synthetic reference polymer. The performance of CNFC II was slightly better than that of CNFC I. In centrifugation analyses, the use of both CNFCs resulted in dense sludge cakes with moderate swelling and good colloidal-removal efficiency.

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The influence of multivalent cations on the flocculation of activated sludge with different sludge retention times

Cited by 53 publications

References 35 publications

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

The microbial community in filamentous bulking sludge with the ultra-low sludge loading and long sludge retention time in oxidation ditch

Cationic nanocelluloses in dewatering of municipal activated sludge

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