Effect of hydraulic conditions on flocculation performances and floc characteristics in Chinese herbal extracts by chitosan and chitosan hydrochloride

Sun, Jiao; Li, Qin; Li, Guishui; Kang, Yong

doi:10.1016/j.cej.2013.03.108

Cited by 20 publications

(10 citation statements)

References 38 publications

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“…Hydraulic conditions [46] are also important for enhancing flocculation, as they can influence both the mixing of agents and raw water and the collision frequency of flocs. A high agitation intensity heightens the collision frequency.…”

Section: Optimization Of Hydraulic Conditionsmentioning

confidence: 99%

Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method

Gan

Liang

et al. 2021

Water

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The performance of chitosan in flocculating kaolin suspensions was investigated. A real-time suspended solid (SS) concentration measuring method was applied. The influence of pH was examined from 2.0 to 13.0. The optimal pH value for low-grade (100 mg/L), middle-grade (500 mg/L), and high-grade (1000 mg/L) kaolin suspension samples was 8.0. The optimal dosage of chitosan for the three grades of kaolin suspensions was 5.0 mg/L, regardless of the initial SS concentration. An orthogonal array test was performed to determine the optimal hydraulic conditions. Range analysis and variance analysis showed that all four considered factors significantly influenced the flocculation performance of chitosan in the following order: paddle rotation speed in the mixing period > paddle rotation speed in the flocculating period > mixing period time > flocculating period time. Intermittent agitation tests were also performed, showing that alternating agitation and settling enhanced the flocculation performance of chitosan.

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Section: Optimization Of Hydraulic Conditionsmentioning

confidence: 99%

Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method

Gan

Liang

et al. 2021

Water

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“…In biological flocs and the flocculation phenomenon, lowest fractal dimensions were observed due to bridging the aggregates, while higher fractal dimension observed aggregates formed by sweep substrate transfer. Hydraulic condition determines the fractal dimensions of flocs as well (Sun, 2013). In addition, initially it increases and then decreases after stirring.…”

Section: Introductionmentioning

confidence: 99%

Fractal analysis of colony margins as an aid for screening freshwater yeast cultures for bioclarification of turbid polluted water resources

Pal

Kamat

2019

JANS

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In Iron ore mining areas of Goa, water resources are polluted due to high turbidity and mineral colloids. For bioclarification of the turbidity, we need to identify some promising property of strains by which the strains of freshwater yeasts can be screened. This work presents a screening of freshwater yeast cultures, based on the complexity of colony margins. We performed screening of the wild aquatic yeasts isolated from different fresh water bodies of Goa on 2nd, 4th and 6th day of incubation respectively. Colony margins of sixteen different strains were studied for their fractality indexes and on comparison significant differences were observed among them. We report comparative analysis of five representative strains in this paper. Particularly strain Bchlm-1-2 showed high fractality index approximately 1410 on 6th day of incubation. This work provides quantitative scoring system of the morphological behavior of large number of strains. Our approach has the potential to improve the accuracy and speed to quantify and compare large number of isolates on the basis of their colony margins.

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“…Unfortunately, most Chinese water resource recovery facilities are only equipped with conventional coagulation, flocculation, and quartz sand filtration (Shirasaki et al, 2010;Zouboulis et al, 2007). In order for China to meet the required water quality standards for drinking water ( GB5749-2006), it is necessary to upgrade conventional processes to cope with micropollutants (Ahammed and Davra, 2011;Amjad et al, 2015;Loo et al, 2012;Shirasaki et al, 2010;Sun et al, 2013;Wang et al, 2013;Xu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…It is crucial to enhance the compactness and settleability of flocs and improve the roughness and specific surface area of filter media. Fractal theory indicates that the fractal structures of flocs and filtration media surfaces significantly affect coagulation and filtration behaviors (Amjad et al, 2015;Sun et al, 2013;Vicsek, 1992;Xu et al, 2011). It is also true that the morphology, size, fractal dimension and compactness of flocs are important for the mass transfer and removal of pollutants (Park et al, 2006;Vicsek, 1992;Yang et al, 2014;Zhou et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Treatment Properties of Iron Oxide Amended Sands Coupled with Polyelectrolyte to Humic Acid

Wang³

et al. 2018

Water Environment Research

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To improve the removal efficiency of micropollutant humic acid at low temperature, microflocculation filtration experiments were conducted with homemade iron oxide amended sands (IOAS), cationic polyelectrolyte (CPE) and polyaluminium chloride (PACl). Fractal properties of flocs structures and IOAS surface and their effects on the removal efficiency of humic acid were investigated. Results showed that IOAS had a porous surface with fractal dimensions (D) (D = 1.744) and a strong adsorption capacity for humic acid. The flocs produced by PACl were small in size, loosely packed with a higher D, and therefore settled slowly. By contrast, the formed flocs by adding CPE with only 1~5% of PACl had strong and open structures with a high effective density, rapid settling velocity and a lower D. Compared with PACl flocs, the larger size CPE flocs and PACl+CPE flocs deposited and packed up on IOAS, creating smaller pores and resulting in a lower D and higher filtration capacity.

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Effect of hydraulic conditions on flocculation performances and floc characteristics in Chinese herbal extracts by chitosan and chitosan hydrochloride

Cited by 20 publications

References 38 publications

Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method

Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method

Fractal analysis of colony margins as an aid for screening freshwater yeast cultures for bioclarification of turbid polluted water resources

Enhanced Treatment Properties of Iron Oxide Amended Sands Coupled with Polyelectrolyte to Humic Acid

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